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CAT204-V1.0/02.04.2012 COMSOFT

ASTERIX SPECIFICATION

Category 204 Transmission of Recognised Air Pictures

V1.0/02.04.2012

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Copyright 2012 by COMSOFT GmbH

CAT 204 Contents

COMSOFT CAT 204-V1.0/02.04.2012 i

Contents

1 Introduction ................................................................................................................... 1

1.1 Overview ............................................................................................................. 1

1.2 Referenced Material ............................................................................................ 2

1.3 Definitions and Acronyms .................................................................................... 3 1.3.1 Definitions .............................................................................................. 3 1.3.2 Acronyms and Abbreviations .................................................................. 4

1.4 General Principles ............................................................................................... 5 1.4.1 Time Management ................................................................................. 5 1.4.2 Unused Bits in Data Items ...................................................................... 5 1.4.3 User Application Profile and Data Blocks ............................................... 5 1.4.4 Composition of Messages ...................................................................... 5

2 Layout of Messages ...................................................................................................... 7

2.1 Standard Data Items for CAT 204 ........................................................................ 7 2.1.1 Data Item I204/000, Message Identification ........................................... 9 2.1.2 Data Item I204/001, NATO Track Number ........................................... 10 2.1.3 Data Item I204/003, Track/Point/EW id ................................................ 12 2.1.4 Data Item I204/010, Data Source Identifier .......................................... 13 2.1.5 Data Item I204/012, Data Destination Identifier .................................... 14 2.1.6 Data Item I204/020, Position in WGS-84 Co-ordinates ......................... 15 2.1.7 Data Item I204/030, Track Quality ........................................................ 16 2.1.8 Data Item I204/040, AMSL Altitude ...................................................... 17 2.1.9 Data Item I204/050, IFFC ..................................................................... 18 2.1.10 Data Item I204/060, Speed/Heading .................................................... 19 2.1.11 Data Item I204/070, Primary Identity .................................................... 20 2.1.12 Data Item I204/080, Environment/Category ......................................... 22 2.1.13 Data Item I204/081, Object Type ......................................................... 23 2.1.14 Data Item I204/082, Track Mode .......................................................... 25 2.1.15 Data Item I204/083, Detection Kind ...................................................... 26 2.1.16 Data Item I204/084, Strength ............................................................... 27 2.1.17 Data Item I204/085, Size ...................................................................... 28 2.1.18 Data Item I204/090, IFF1 ..................................................................... 29 2.1.19 Data Item I204/091, IFF2 ..................................................................... 30 2.1.20 Data Item I204/092, IFF3 ..................................................................... 31 2.1.21 Data Item I204/093, IFF4 ..................................................................... 32 2.1.22 Data Item I204/094, Mode-5 & Extended Mode-1 Code ....................... 33 2.1.23 Data Item I204/101, Aircraft Derived Data ............................................ 40 2.1.24 Data Item I204/130, Secondary Identity Information ............................. 46 2.1.25 Data Item I204/170, Indicators Block .................................................... 55 2.1.26 Data Item I204/245, Target Identification.............................................. 58 2.1.27 Data Item I204/260, Object Status ....................................................... 59 2.1.28 Data Item I204/280, Update Time ........................................................ 60 2.1.29 Data Item I204/291, Track Data Ages .................................................. 61 2.1.30 Data Item I204/400, Strobe Data .......................................................... 67 2.1.31 Data Item I204/620, Mission Weapon Engagement ............................. 69

Contents CAT 204

ii CAT 204-V1.0/02.04.2012 COMSOFT

2.1.32 Data Item I204/630, Sensor List ........................................................... 72 2.1.33 Data Item I204/690, Resource Availability ............................................ 73 2.1.34 Data Item I204/700, Order Identifier ..................................................... 74 2.1.35 Data Item I204/710, Acknowledgement Designator .............................. 76 2.1.36 Data Item I204/720, Track Filter Designator ......................................... 77 2.1.37 Data Item I204/730, NTN Specifier ....................................................... 78 2.1.38 Data Item I204/740, Relayed Data Source Identifier ............................. 79

2.2 User Application Profile for CAT 204 .................................................................. 80

List of Tables

Table 1: Standard Data Items for CAT 204 ........................................................................ 8

Table 2: Recognized Air Picture UAP (RAP-UAP) ........................................................... 81

Category 204 Introduction

COMSOFT CAT 204-V1.0/02.04.2012 1

1 Introduction

1.1 Overview

This document defines the message structure for the transmission of Recognised Air Picture

(RAP) Data between users.

This document defines the data in ASTERIX Category 204.

COMSOFT has developed this ASTERIX [R2] Category for the German Air Force (GAF) to

transmit the RAP. The ASTERIX Category has been assigned the number 204 after

consultation between GAF and EUROCONTROL.

The initial requirements for the ASTERIX Category 204 are the following:

1. Data content of the RAP as available in LINK1 [R8] format (in the interpretation for

NADGE including Mode-S extensions)

2. In addition to the Link-1 data content the following information:

a. MODE C height

b. MODE S (Callsign used in flight, height, GPS position)

c. MODE 4

d. In the future: MODE 5

3. Downward compatibility to the Link-1 format

a. A data format conversion of the RAP in the new ASTERIX category to Link-1 shall be possible

b. A data format conversion of the RAP in Link-1 to the new ASTERIX category shall be possible

This specification details the ASTERIX Category 204 implementing the above mentioned

requirements.

Alongside the requirements above the basis for the development of this ASTERIX Category

has been the draft version of the NATO ASTERIX Category 201 [R4] and for some items the

EUROCONTROL ASTERIX Category 62 [R3]. Some encodings are based on LINK-16 [R7]

standard definitions.

Introduction Category 204

2 CAT 204-V1.0/02.04.2012 COMSOFT

1.2 Referenced Material

[R1] ANSI/IEEE Std. 610.12, IEEE Standard Glossary of Software Engineering

Terminology.

[R2] Eurocontrol Standard SUR.ET1.ST05.2000-STD-01-01. All Purpose Structured

Eurocontrol Surveillance Information Exchange - ASTERIX. Edition 1.29, Proposed,

February 2002.

[R3] Eurocontrol Standard SUR.ET1.ST05.2000-STD-09-01. Eurocontrol Standard

Document for Surveillance Data Exchange – Part 9: Category 62. Edition 1.13,

Released, October 2010.

[R4] NATO STANDARD DOCUMENT FOR AIR SURVAILLANCE AND GROUND

BASED SENSORS INFORMATION EXCHANGE – System Object Category 201.

ADatP-35 part XII; Edition 1.2, Draft, May 2009.

[R5] ICAO Annex 10, Vol. IV.

[R6] NATO STANAG 5501 (EDITION 4) – DIGITAL DATA LINK – LINK1 (POINT-TO-

POINT).

[R7] NATO STANAG 5516 (EDITION 5) – TACTICAL DATA EXCHANGE – LINK16.

[R8] NATO STANAG 5501 (EDITION 7 1st Draft) – DIGITAL DATA LINK – LINK1

(POINT-TO-POINT).


COMSOFT CAT 204-V1.0/02.04.2012 3

1.3 Definitions and Acronyms

1.3.1 Definitions

For the purposes of this Document, the following definitions shall apply:

Catalogue of Data Items:

List of all the possible Data Items of each Data Category describing the Data Items by their reference, structure, size and units (where applicable).

Data Block: Unit of information seen by the application as a discrete entity by its contents. A Data Block contains one or more Record(s) containing data of the same Category.

Data Category: Classification of the data in order to permit inter alia an easy identification.

Data Field: Physical implementation for the purpose of communication of a Data Item, it is associated with a unique Field Reference Number and is the smallest unit of transmitted information.

Data Item: The smallest unit of information in each Data Category.

Record: A collection of transmitted Data Fields of the same Category preceded by a Field Specification field, signalling the presence/absence of the various Data Fields

User

Application

Profile:

The mechanism for assigning Data Items to Data Fields, and containing all necessary information which needs to be standardised for the successful encoding and decoding of the messages.


4 CAT 204-V1.0/02.04.2012 COMSOFT

1.3.2 Acronyms and Abbreviations

For the purposes of this Document the following shall apply:

ASTERIX All Purpose STructured Eurocontrol suRveillance Information Exchange

CAT Data Category

FRN Field Reference Number

FSPEC Field Specification

FX Field Extension Indicator

ICAO International Civil Aviation Organisation

LEN Length Indicator

LSB Least Significant Bit

NM Nautical Mile, unit of distance (1852 metres)

REP Field Repetition Indicator

s second, unit of time

SAC System Area Code

SIC System Identification Code

SP Special Purpose Indicator

UAP User Application Profile (see Definitions)

UTC Co-ordinated Universal Time

WGS-84 World Geodetic System 84


COMSOFT CAT 204-V1.0/02.04.2012 5

1.4 General Principles

1.4.1 Time Management

The time-stamping shall comply with the Coordinated Universal Time (UTC) as specified in

ICAO Annex 5.

1.4.2 Unused Bits in Data Items

Decoders of ASTERIX data shall never assume and rely on specific settings of spare or

unused bits. However in order to improve the readability of binary dumps of ASTERIX

records, it is recommended to set all spare bits to zero.

1.4.3 User Application Profile and Data Blocks

A single User Application Profile (UAP) is defined and shall be used for Recognised Air P

icture (RAP) messages. Data Blocks shall have the following layout:

CAT = 204 LEN FSPEC Items of the first record

FSPEC Items of the last record

where:

Data Category (CAT) = 204, is a one-octet field indicating that the Data Block contains

RAP messages;

Length Indicator (LEN) is a two-octet field indicating the total length in octets of the

Data Block, including the CAT and LEN fields;

FSPEC is the Field Specification.

1.4.4 Composition of Messages

Messages shall be composed of Data Items assembled in the order defined by the

Field Reference Number (FRN) in the associated UAP.

When sent, items shall always be transmitted in a Record with the corresponding

FSPEC Bits set to one.


6 CAT 204-V1.0/02.04.2012 COMSOFT

This page is intentionally left blank !

Category 204 Layout of Messages

COMSOFT CAT 204-V1.0/02.04.2012 7

2 Layout of Messages

2.1 Standard Data Items for CAT 204

The standardised Data Items which shall be used are defined in Table 1 and described in the

following pages

Data Item Reference Number

Description Resolution

I204/000 Message Identification N.A.

I204/001 NATO Track Number N.A.

I204/010 Data Source Identifier N.A.

I204/012 Data Destination Identifier N.A.

I204/003 Track/Point/EW id N.A.

I204/020 Position in WGS-84 Co-ordinates 180°/230

I204/030 Track Quality N.A.

I204/040 AMSL Altitude 1m

I204/050 IFFC 25ft

I204/060 Speed/Heading various

I204/070 Primary Identity N.A.

I204/080 Environment/Category N.A.

I204/081 Object Type N.A.

I204/082 Track Mode N.A.

I204/083 Detection Kind N.A.

I204/084 Strength N.A.

I204/085 Size 1 km2.

I204/090 IFF1 1s, N.A.

I204/091 IFF2 1s, N.A.

I204/092 IFF3 1s, N.A.

I204/093 IFF4 1s, N.A.

I204/094 Mode-5 various

Layout of Messages Category 204

8 CAT 204-V1.0/02.04.2012 COMSOFT

Data Item Reference Number

Description Resolution

I204/101 Aircraft Derived Data various

I204/130 Secondary Identity Information N.A.

I204/170 Indicators Block N.A.

I204/245 Target Identification N.A.

I204/260 Object Status N.A.

I204/280 Update Time 1µs

I204/291 Track Data Ages 1/4 s

I204/400 Strobe Data various

I204/620 Mission Weapon Engagement N.A.

I204/630 Sensor List N.A.

I204/690 Resource Availability N.A.

I204/700 Order Identifier N.A.

I204/710 Acknowledgement Designator N.A.

I204/720 Track Filter Designator N.A.

I204/730 NTN Specifier N.A.

I204/740 Relayed Data Source Identifier N.A.

Table 1: Standard Data Items for CAT 204

A CAT 204 ASTERIX record shall only contain information of one kind (see I204/000,

Message Identification), i.e. information of different kind has to be split into different

ASTERIX records.

Although not mandatory, each CAT 204 ASTERIX record should contain I204/000 to specify

the kind of the information contained in the record.

Example: it is not allowed to transmit strobe and position information in the same CAT 204

ASTERIX record but there shall be one record with strobe information and another record

with position information.


COMSOFT CAT 204-V1.0/02.04.2012 9

2.1.1 Data Item I204/000, Message Identification

Definition:

Defines the kind of the ASTERIX message.

Format:

2 - Octet Fixed Length Data Item

Structure:

Octet no 1 Octet no 2

16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1

CODE

bits-16/1 Message identification integer value (1..65535)

871 = Enhanced surveillance performance request 1191 = Order acknowledgement 1201 = Identification data acquisition request/order 1202 = Mode 4 request 1911 = RAP emergency point 1921 = RAP EW strobe/fix 1931 = RAP reference point 1941 = JEP track 1951 = Land point 2631 = Track number change 2691 = Visual sighting 2891 = Track identity report 10181 = Mission to track association 10521 = Change manual to auto 10541 = Engage inhibit 10591 = Measurement request operator 10611 = Discrete events 10631 = LAP-RAP track reference 11151 = Drop/inhibit drop point 11152 = Drop TBM source 11161 = Control data 11181 = IFF codes change 11501 = PPLI Notification

11531 = Heart Beat

11891 = AEW Track identity report

Encoding Rule:

This Item is optional.

Context:

The item was taken over from [R4], the Item Definition was changed and CODE 11891 (AEW

Track identity report) was added to carry the corresponding Link 1 information


10 CAT 204-V1.0/02.04.2012 COMSOFT

2.1.2 Data Item I204/001, NATO Track Number

Definition:

Unique Identifier

Format:


Structure:

Octet no 1

24 23 22 21 20 19 18 17

0 0 0 C1


16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1

C2 C3 C4 C5 0 0

bits-24/22 Spare bits set to 0

bits-21/17 (C1) NATO Track Number - 1st character

bits-16/12 (C2) NATO Track Number - 2nd character

bits-11/9 (C3) NATO Track Number - 3rd character

bits-8/6 (C4) NATO Track Number – 4th character


bit-2/1 Spare bits set to 0

Encoding Rule:

This item shall be present in all ASTERIX records related to position information.


COMSOFT CAT 204-V1.0/02.04.2012 11

NOTE:

The 19 bit NATO Track Number is composed of two 5-bit groups followed by three 3-bit

groups, for a total of five characters. The 5 bit groups have a range of meanings of 0 through

7, or A through Z, less I and O.

5-Bit Group 3-Bit Group

CODE CHAR CODE CHAR CODE CHAR

00000

00001

00010

00011

00100

00101

00110

00111

01000

01001

01010

01011

01100

01101

01110

01111

0

1

2

3

4

5

6

7

A

B

C

D

E

F

G

H

10000

10001

10010

10011

10100

10101

10110

10111

11000

11001

11010

11011

11100

11101

11110

11111

J

K

L

M

N

P

Q

R

S

T

U

V

W

X

Y

Z

000

001

010

011

100

101

110

111

0

1

2

3

4

5

6

7

Context:

Item I201/001 from [R4] was taken as a starting basis. As the encoding rule for I201/001 is

inconsistent the encoding was defined as in [R7] Annex B, chapter "Address Allocation".


12 CAT 204-V1.0/02.04.2012 COMSOFT

2.1.3 Data Item I204/003, Track/Point/EW id

Definition:

Internal object id

Format:

2 - Octets Fixed Length Data Item

Structure:


16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1

OBJECT ID

bits-16/1 (OBJECT ID) integer value

1..4000

Encoding Rule:


Context:

The item was taken over from [R4].


COMSOFT CAT 204-V1.0/02.04.2012 13

2.1.4 Data Item I204/010, Data Source Identifier

Definition:

Identification of the data source from which the data is received

Format:


Structure:


16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1

SAC SIC

bits-16/9 (SAC) System Area Code

bits-8/1 (SIC) System Identification Code

Encoding Rule:

This Item shall be present in every ASTERIX record.

Context:

The item was not present in [R4]. To identify and distinguish data streams in ASTERIX the

data source identifier is mandatory.


14 CAT 204-V1.0/02.04.2012 COMSOFT

2.1.5 Data Item I204/012, Data Destination Identifier

Definition:

Identification of the destination data sink to which the data is forwarded

Format:

Repetitive data item with 1 – octet field repetition followed by 2 – octet packets as needed.

Structure of first part:

Octet no 1

8 7 6 5 4 3 2 1

REP

bits-8/1 (REP) Number of destination identifier

Structure of extents:


16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1

SAC SIC



Encoding Rule:

This Item shall be present in every ASTERIX record.

Context:

The item was not present in [R4]. To identify and distinguish destinations a data destination

identifier is mandatory. To address more than one destination (multi-casting) a set of

destination identifier can be given.


COMSOFT CAT 204-V1.0/02.04.2012 15

2.1.6 Data Item I204/020, Position in WGS-84 Co-ordinates

Definition:

Position in WGS-84 Co-ordinates

Format:


Structure:


64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49

LATITUDE


48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33

LATITUDE


32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17

LONGITUDE


16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1

LONGITUDE

bits-64/33 (LATITUDE) In WGS-84 in two’s complement.

Range -90° <= latitude <= 90°

bits-32/1 (LONGITUDE) In WGS-84 in two’s complement.

Range -180° <= longitude < 180°

The least significant bit of Latitude and Longitude is 180°/230 = 1.6764° * 10-07.

This corresponds to a resolution of at least 2 centimetres

Encoding Rule:

This Item shall be present in every ASTERIX record related to position information.

NOTE - Positive longitude indicates East. Positive latitude indicates North.

Context:

The item was taken over from [R4] with improved description.


16 CAT 204-V1.0/02.04.2012 COMSOFT

2.1.7 Data Item I204/030, Track Quality

Definition:

Track Quality.

Format:


Structure:

Octet no 1

8 7 6 5 4 3 2 1

TQ

bits-8/1 (TQ) = 0 .. 15

Encoding Rule:


NOTE:

The track quality is stated as a numerical value from 0 to 15 with the higher values indicating

the higher track qualities. The TQ is based on the positional accuracy of a track represented

by an area in square Data Miles within which it is assessed that there is a 95% probability

that the track lies.

TQ=0 is reserved for "Non Real Time Tracks"

Context:

The item was taken over from [R4] but TQ=0 was allowed as well.


COMSOFT CAT 204-V1.0/02.04.2012 17

2.1.8 Data Item I204/040, AMSL Altitude

Definition:

Altitude of the object

Format:


Structure:


32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17

ALTITUDE


16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1

ALTITUDE

bits-32/1 (Altitude) 32 bits signed integer in two’s complement

LSB = 1 meter (regarding mean sea level)

Encoding Rule:

This Item is optional

Context:



18 CAT 204-V1.0/02.04.2012 COMSOFT

2.1.9 Data Item I204/050, IFFC

Definition:

Value of IFFC

Format:

2 - Octets Fixed Length Data Item.

Structure:


16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1

IFFC

bits-16/1 (IFFC) 16 bits signed integer in two’s complement

LSB = 25ft (regarding Mean Sea Level)

Encoding Rule:


Context:

Item I201/050 from [R4] was modified so that the LSB = 25ft as this is the readout accuracy

of the transponder.


COMSOFT CAT 204-V1.0/02.04.2012 19

2.1.10 Data Item I204/060, Speed/Heading

Definition:

Norm speed and heading of the track.

Format:


Structure:


64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49

0 0 VSPD CLIM VSPEED


48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33

VSPEED MACH


32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17

HEADING


16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1

HSPEED


bit-62 (VSPD) 0 = No VSPEED

1 = VSPEED available

bit-61 (CLIM) 0 = Climbing

1 = Descending

bits-60/45 (VSPEED) LSB = 0.125 m/s

Max = 8191,875 m/s

bits-44/33 (MACH) Speed in 1/10 Mach from 0 to 4 LSB = 0.1 Mach

bits-32/17 (HEADING) LSB = 360°/216 = 0.0055°

bits-16/1 (HSPEED) LSB = 0.1 m/s

Encoding Rule:


Context:

The item was taken over from [R4] with slightly modified description.


20 CAT 204-V1.0/02.04.2012 COMSOFT

2.1.11 Data Item I204/070, Primary Identity

Definition:

Primary Identity of a track

Format:


Structure:


16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1

EXERCISE ID MAIN ID

bits-16/9 (EXERCISE ID) 0 = exercise PENDING

1 = exercise UNKNOWN

2 = exercise ASSUMED FRIEND

3 = exercise FRIEND

4 = exercise NEUTRAL

5 = JOKER (exercise SUSPECT)

6 = FAKER (exercise HOSTILE)

bits-8/1 (MAIN ID) 0 = PENDING

1 = UNKNOWN

2 = ASSUMED FRIEND

3 = FRIEND

4 = NEUTRAL

5 = SUSPECT

6 = HOSTILE

Encoding Rule:



COMSOFT CAT 204-V1.0/02.04.2012 21

NOTES:

These standard identity terms are further amplified by the Special Interest Indicator, Exercise

Indicator and Identity Amplifying Descriptor, Specific Type, Platform, Platform Activity and

Identity Confidence fields.

When the Exercise Indicator is set to value 0 (Non Exercise Track), the exercise identity is

no-statement.

When the Exercise Indicator is set to value 1 (Exercise Track), the main identity of the track

shall be Friend and the exercise identity shall be specified in the Exercise Identity field.

In particular, a track with the exercise indicator set to value 1, Exercise Track and the main

identity set to value 6 (HOSTILE), shall be identified as a friendly track acting as a hostile for

exercise purposes (FAKER).

Also, a track with the exercise indicator set to value 1, Exercise Track and the main Identity

set to value 5 (SUSPECT), shall be identified as a friendly track acting as a suspect for

exercise purposes (JOKER).

Context:



22 CAT 204-V1.0/02.04.2012 COMSOFT

2.1.12 Data Item I204/080, Environment/Category

Definition:

Environment/category of an object track, point of Ewdata.

Format:


Structure:

Octet no 1

8 7 6 5 4 3 2 1

ENV/CAT

bits-8/1 (ENV/CAT) 0 = no statement

1 = space

2 = air

3 = surface

4 = subsurface

5 = land

Encoding Rule:


Context:



COMSOFT CAT 204-V1.0/02.04.2012 23

2.1.13 Data Item I204/081, Object Type

Definition:

Type of the object (track, point or strobe)

Format:


Structure:

Octet no 1

8 7 6 5 4 3 2 1

SRP TYPE

bit-8 (SRP) 0 = not self reported position

1 = self reported position

bits-7/1 (TYPE) 0 = undefined type

1 = AOP

2 = fix

3 = bearing

4 = point

5 = detection

6 = remote track

7 = local track

8 = synthetic track

9 = PPLI

10 = indirect PPLI

11 = Mode-S ADSB/ Mode-5 position

Encoding Rule:


NOTES:

Used for track:

0 = undefined type

5 = detection

6 = remote track

7 = local track


24 CAT 204-V1.0/02.04.2012 COMSOFT

8 = synthetic track

9 = PPLI

10 = indirect PPLI

11 = Mode-S ADSB/ Mode-5 position

If the system correlated track has a local component, the type will be LOCAL_TRACK

Used for point:

0 = undefined type

4 = point

9 = PPLI

10 = indirect PPLI

Used for EW data:

0 = undefined type

1 = AOP

2 = fix

3 = bearing

The SRP indicator can be set to 1 for a track

Context:



COMSOFT CAT 204-V1.0/02.04.2012 25

2.1.14 Data Item I204/082, Track Mode

Definition:

Mode of creation of the object

Format:


Structure:

Octet no 1

8 7 6 5 4 3 2 1

MODE

bits-8/1 (MODE) 0 = undefined

1 = manual

2 = auto

3 = manual tracking

Encoding Rule:


Context:



26 CAT 204-V1.0/02.04.2012 COMSOFT

2.1.15 Data Item I204/083, Detection Kind

Definition:

Kind of detection

Format:


Structure:

Octet no 1

8 7 6 5 4 3 2 1

KIND

bits-8/1 (KIND) 0 = undefined

1 = active

2 = passive

Encoding Rule:


Context:



COMSOFT CAT 204-V1.0/02.04.2012 27

2.1.16 Data Item I204/084, Strength

Definition:

Strength of track, i.e. number of planes in the raid (min and max possible)

Format:


Structure:

Octet no 1

24 23 22 21 20 19 18 17

FORMAT


16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1

MAX MIN

bits-24/17 (FORMAT) 0= above min

1= below max

2= between min and max

3= equal

bits-16/9 (MAX) max number of planes

bits-8/1 (MIN) min number of planes

Encoding Rule:

This item is optional

NOTE:

If format is BETWEEN_MIN_MAX, the number of planes is comprised between strength min

and strength max.

If format is EQUAL, strength min is the exact number of planes.

If format is BELOW_MAX, strength min is the max number of planes.

If format is ABOVE_MIN, strength min is the minimum number of planes.

Context:



28 CAT 204-V1.0/02.04.2012 COMSOFT

2.1.17 Data Item I204/085, Size

Definition:

Size of track, i.e. size of raid expressed as a square area (min and max possible)

Format:


Structure:

Octet no 1

24 23 22 21 20 19 18 17

FORMAT


16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1

MAX MIN

bits-24/17 (FORMAT) 0= above min

1= below max

2= between min and max

bits-16/9 (MAX) max square side length, LSB = 1 km

bits-8/1 (MIN) min square side length, LSB = 1 km

Encoding Rule:


NOTE:

The maximum value of 255 corresponds to a square area of 255 km * 255 km = 65025 km2

If format is BETWEEN_MIN_MAX, the side length the square area is comprised between

size min and size max.

If format is BELOW_MAX, the max. side length is encoded in “MIN”.

If format is ABOVE_MIN, the min. side length is encoded in “MIN”.

Context:

The item was created to carry the corresponding Link1 information.


COMSOFT CAT 204-V1.0/02.04.2012 29

2.1.18 Data Item I204/090, IFF1

Definition:

IFF1 code

Format:


Structure:

Octet no 1

8 7 6 5 4 3 2 1

0 0 0 IFF1


bits-5/1 (IFF1) 00..73 (octal)

Encoding Rule:


Context:

The item was taken over from [R4] but the AGE was removed (to be encoded In I204/291),

spare bits were added.


30 CAT 204-V1.0/02.04.2012 COMSOFT

2.1.19 Data Item I204/091, IFF2

Definition:

IFF2 code

Format:


Structure:


16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1

0 0 0 0 IFF2


bits-12/1 (IFF2) 0..7777 (octal)

Encoding Rule:


Context:

The item was taken over from [R4] but with a correct encoding of IFF2. AGE was removed

(to be encoded In I204/291).


COMSOFT CAT 204-V1.0/02.04.2012 31

2.1.20 Data Item I204/092, IFF3

Definition:

IFF3 code

Format:


Structure:


16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1

0 0 0 0 IFF3


bits-12/1 (IFF3) 0..7777 (octal)

Encoding Rule:


Context:

The item was taken over from [R4] but with a correct encoding of IFF3. AGE was removed

(to be encoded In I204/291).


32 CAT 204-V1.0/02.04.2012 COMSOFT

2.1.21 Data Item I204/093, IFF4

Definition:

IFF4 code

Format:


Structure:

Octet no 2

8 7 6 5 4 3 2 1

0 0 0 0 0 IFF4


bits-3/1 (IFF4) 0 = undefined IFF4

1 = interrogating

2 = invalid response

3 = valid response

4 = no reply

Encoding Rule:


Context:

The item was taken over from [R4] but AGE was removed (to be encoded In I204/291), spare

bits added.


COMSOFT CAT 204-V1.0/02.04.2012 33

2.1.22 Data Item I204/094, Mode-5 & Extended Mode-1 Code

Definition:

Mode 5 Data/Reports, Extended Mode 1 Code and X pulse

Format:

Compound data item comprising one primary subfield of one octet, followed by up to 7

subfields

Structure:

8 7 6 5 4 3 2 1

SUM PMN POS GA EM1 TOS XP FX

bit-8 (SUM) Subfield#1: Mode 5 Summary

= 0 Absence of Subfield #1 = 1 Presence of Subfield #1

bit-7 (PMN) Subfield#2: Mode 5 PIN/ National Origin/Mission Code


bit-6 (POS) Subfield#3: Mode 5 Reported Position


bit-5 (GA) Subfield#4: Mode 5 GNSS-derived Altitude


bit-4 (EM1) Subfield#5: Extended Mode 1 Code in Octal Representation


bit-3 (TOS) Subfield#6: Time Offset for POS and GA


bit-2 (XP) Subfield#7: X Pulse Presence


bit-1 (FX) = 0 End of Primary Subfield = 1 Extension of Primary Subfield into next octet


34 CAT 204-V1.0/02.04.2012 COMSOFT

Encoding Rule:


Context:

Item is defined as I062/110 from [R3] but Subfield #6 (Time Offset for POS and GA) was

modified so that LSB = 1 µs.

Structure of Subfield #1

Mode 5 Summary:

Octet no 1

8 7 6 5 4 3 2 1

M5 ID DA M1 M2 M3 MC X

bit-8 (M5) = 0 No Mode 5 interrogation

= 1 Mode 5 interrogation

bit-7 (ID) = 0 No authenticated Mode 5 ID reply

= 1 Authenticated Mode 5 ID reply

bit-6 (DA) = 0 No authenticated Mode 5 Data reply or Report

= 1 Authenticated Mode 5 Data reply or Report (i.e any valid Mode 5 reply type other than ID)

bit-5 (M1) = 0 Mode 1 code not present or not from Mode 5 reply

= 1 Mode 1 code from Mode 5 reply.





bit-2 (MC) = 0 Mode C altitude not present or not from Mode 5 reply

= 1 Mode C altitude from Mode 5 reply

bit-1 (X) = 0 X-pulse set to zero or no authenticated Data reply or report received

= 1 X-pulse set to one.


COMSOFT CAT 204-V1.0/02.04.2012 35

NOTES:

1. The flags M2, M3, MC refer to the contents of data items I204/091, I204/092 and

I204/050 respectively. The flag M1 refers to the contents of data item I204/090, IFF1,

and to the contents of the Subfield #5 (Extended Mode 1 Code in Octal

Representation).

2. If an authenticated Mode 5 reply is received with the Emergency bit set, then the

Emergency bits (EMER) in I204/170 shall be set to “emergency”.

3. If an authenticated Mode 5 reply is received with the Identification of Position bit set,

then the Special Position Identification bit (SPI) in 204/170, shall be set.


Mode 5 PIN / National Origin/ Mission Code:


32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17

0 0 PIN


16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1

0 0 0 NAT 0 0 MIS


Bits-30/17 (PIN) PIN Code


bits-13/9 (NAT) National Origin


Bits-6/1 (MIS) Mission Code


36 CAT 204-V1.0/02.04.2012 COMSOFT


Mode 5 Reported Position


48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33

LATITUDE


32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17

LATITUIDE LONGITUDE


16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1

LONGITUDE



Sign convention: North is positive.

LSB = 180/223

degrees = 2.145767*10-05

degrees



Sign convention: East is positive.

LSB = 180/223

degrees = 2.145767*10-05

degrees

NOTE - The resolution implied by the LSB is better than the resolution with which Mode 5

position reports are transmitted from aircraft transponders using currently defined formats.


COMSOFT CAT 204-V1.0/02.04.2012 37


Mode 5 GNSS-derived Altitude


16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1

0 RES GA

bit-16 Spare bit set to 0

bit-15 (RES) Resolution with which the GNSS-derived Altitude (GA) is reported.

=0 GA reported in 100 ft increments, =1 GA reported in 25 ft increments

bits-14/1 (GA) GNSS-derived Altitude of target, expressed as height above WGS 84 ellipsoid. GA is coded as a 14-bit two’s complement binary number with an LSB of 25 ft. irrespective of the setting of RES. The minimum value of GA that can be reported is -1000 ft.


Extended Mode 1 Code in Octal Representation


16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1

0 0 0 0 A4 A2 A1 B4 B2 B1 C4 C2 C1 D4 D2 D1


bits-12/1 (EM1) Extended Mode 1 Code in octal representation

NOTE - If Subfield #1 is present, the M1 bit in Subfield #1 indicates whether the Extended

Mode 1 Code is from a Mode 5 reply or a Mode 1 reply. If Subfield #1 is not present, the

Extended Mode 1 Code is from a Mode 1 reply.


38 CAT 204-V1.0/02.04.2012 COMSOFT


Time Offset for POS and GA


16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1

TOS

bits-16/1 (TOS) Time Offset coded as a twos complement number with an LSB of 1 µs. The time at which the Mode 5 Reported Position (Subfield #3) and Mode 5 GNSS-derived Altitude (Subfield #4) are valid is given by Update Time (I204/280) plus Time Offset.

NOTE - TOS shall be assumed to be zero if Subfield #6 is not present.


COMSOFT CAT 204-V1.0/02.04.2012 39


X Pulse Presence

Octet no 1

8 7 6 5 4 3 2 1

0 0 0 X5 XC X3 X2 X1

bits-8/6 Spare bits set to zero

bit-5 (X5) X-pulse from Mode 5 Data reply or Report.

= 0 X-pulse set to zero or no authenticated Data reply or Report received.

= 1 X-pulse set to one (present).

bit-4 (XC) X-pulse from Mode C reply.

= 0 X-pulse set to zero or no Mode C reply.


bit-3 (X3) X-pulse from Mode 3/A reply.

= 0 X-pulse set to zero or no Mode 3/A reply.


bit-2 (X2) X-pulse from Mode 2 reply.

= 0 X-pulse set to zero or no Mode 2 reply.


bit-1 (X1) X-pulse from Mode 1 reply.

= 0 X-pulse set to zero or no Mode 1 reply.


Encoding Rule:



40 CAT 204-V1.0/02.04.2012 COMSOFT

2.1.23 Data Item I204/101, Aircraft Derived Data

Definition:

Data derived directly by the aircraft.

Format:

Compound Data Item, comprising a primary subfield of 1 octett, followed by the indicated subfields.

Structure of Primary Subfield:

8 7 6 5 4 3 2 1

ADR ID COM ACS POS GAL MB FX

bit-8 (ADR) Subfield#1: Target Address


bit-7 (ID) Subfield#2: Target Identification


bit-6 (COM) Subfield#3: Communications / ACAS Capability and Flight Status reported by Mode-S


bit-5 (ACS) Subfield#4: ACAS Resolution Advisory Report


bit-4 (POS) Subfield#5: Position


bit-3 (GAL) Subfield#6: Geometric Altitude


bit-2 (MB) Subfield#7: Mode S MB Data


bit-1 (FX) = 0 End of Primary Subfield


COMSOFT CAT 204-V1.0/02.04.2012 41

Encoding Rule:


Context:

Item I062/380 from [R3] was taken as a starting basis and reduced to the relevant

information within this context.

Structure of Subfield #1:

Target Address

Octet no 1

24 23 22 21 20 19 18 17


16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1

Target Address

bits-24/1 24 bits Target Address, A23 to A0


Target Identification


48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33

Character 1 Character 2 Character 3/1


32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17

Char 3/2 Character 4 Character 5 Char 6/1


16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1

Character 6/2 Character 7 Character 8

bits-48/1 Characters 1-8 (coded on 6 bits each) defining a target

identification when flight plan is available or the registration

marking when no flight plan is available.

Coding rules are provided in [R5] Section 3.1.2.9.1.2


42 CAT 204-V1.0/02.04.2012 COMSOFT


Communications / ACAS Capability and Flight Status reported by Mode-S


16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1

COM STAT 0 0 SSC ARC AIC B1A B1B

bits-16/14 (COM) Communications capability of the transponder

= 0 No communications capability (surveillance only)

= 1 Comm. A and Comm. B capability

= 2 Comm. A, Comm. B and Uplink ELM

= 3 Comm. A, Comm. B, Uplink ELM and Downlink ELM

= 4 Level 5 Transponder capability

5 to 7 Not assigned

bits-13/11 (STAT) Flight Status

= 0 No alert, no SPI, aircraft airborne

= 1 No alert, no SPI, aircraft on ground

= 2 Alert, no SPI, aircraft airborne

= 3 Alert, no SPI, aircraft on ground

= 4 Alert, SPI, aircraft airborne or on ground

= 5 No alert, SPI, aircraft airborne or on ground


bit-8 (SSC) Specific service capability

= 0 No

= 1 Yes

bit-7 (ARC) Altitude reporting capability

= 0 100 ft resolution

= 1 25 ft resolution

bit-6 (AIC) Aircraft identification capability

= 0 No

= 1 Yes

bit-5 (B1A) BDS 1,0 bit 16

bit-4/1 (B1B) BDS 1,0 bits 37/40


COMSOFT CAT 204-V1.0/02.04.2012 43


ACAS Resolution Advisory Report

Currently active Resolution Advisory (RA), if any, generated by the ACAS associated with the

transponder transmitting the report and threat identity data.

Octet no 1

56 55 54 53 52 51 50 49

MB Data


48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33


32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17


16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1

bits-56/1 (MB Data) 56-bit message conveying Mode S Comm B message data of BDS Register 3,0

NOTE - Refer to ICAO Draft SARPs for ACAS for detailed explanations.


44 CAT 204-V1.0/02.04.2012 COMSOFT


Position


48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33

LATITUDE


32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17

LONGITUDE


16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1





The least significant bit of Latitude and Longitude is 180°/223 = 2.145767° * 10-05.

This corresponds to a resolution of at least 2.4 meters


Geometric Altitude


16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1

Altitude

bits-16/1 (Altitude) Altitude in two’s complement form -1500 ft

Altitude 150000 ft (LSB) = 6.25 ft


COMSOFT CAT 204-V1.0/02.04.2012 45


Mode S MB Data

Octet no 1

8 7 6 5 4 3 2 1

REP

bits-8/1 (REP) Number of BDS Reports


64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49

MB Data (56 bits)


48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33


32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17


16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1

BDS 1 BDS 2

bits-64/9 (MB Data) 56 bit message conveying Mode S B message data

bits-8/5 (BDS 1) Comm B data Buffer Store 1 Address

bits-4/1 (BDS 2) Comm B data Buffer Store 2 Address

Encoding Rule:


NOTE - Only DAPs that cannot be encoded into other subfields of this item should be sent

using subfield #7


46 CAT 204-V1.0/02.04.2012 COMSOFT

2.1.24 Data Item I204/130, Secondary Identity Information

Definition:

Block of complementary identity information received from LINK or attribute by IDT.

Format:

Compound Data Item, comprising a primary subfield of 1 octet, followed by the indicated subfields.


Octet no 1

8 7 6 5 4 3 2 1

CONF ACT TYP STYP NAT 0 0 FX

bit-8 (CONF) Subfield#1: Platform Evaluation Confidence


bit-7 (ACT) Subfield#2: Platform Activity


bit-6 (TYP) Subfield#3: Platform Type


bit-5 (STYP) Subfield#4: Specific Type


bit-4 (NAT) Subfield#5: National Alliance




Encoding Rule:


Context:

The item was taken over from [R4] but the ordering and naming of the subfields was

corrected / improved. Subfield#4 was extended so that all possible codes can be encoded.


COMSOFT CAT 204-V1.0/02.04.2012 47


Platform Evaluation Confidence

Octet no 1

8 7 6 5 4 3 2 1

CONF

bits-8/1 (CONF) See [R7], DFI

431/DUI 004 in J3.7 C1

0 = No statement

1 = Positive/certain

2 = Probable

3 = Possible

4 = Low


Platform Activity

Octet no 1

8 7 6 5 4 3 2 1

ACT

bits-8/1 (ACT) See [R7], DFI 1798/ DUI 001, 002, 003, 004, 005.

If I204/080.ENV/CAT = 2 (air):

0 NO STATEMENT 1 RECONNAISSANCE 2 OVER THE HORIZON TARGETING (OTHT) 3 TRAINING 4 LOGISTICS SUPPORT 5 ANTISURFACE WARFARE 6 ELECTRONIC WARFARE (EW) 7 SURVEILLANCE 8 SEARCH AND RESCUE (SAR) 9 ESCORTING 10 MINELAYING 11 TRANSITING 12 SPECIAL WEAPONS ATTACK 13 INTRUDING 14 ELECTRONIC WARFARE 15 SUPPORT MEASURES (ESM) COMMUNICATIONS RELAY 16 PATROL (OCEAN SURVEILLANCE) 17 AIRLIFT (TRANSPORT)


48 CAT 204-V1.0/02.04.2012 COMSOFT

18 ANTISUBMARINE WARFARE (ASW) 19 SHADOWING/INTERVENING 20 TOWING 21 AIR ASSAULT 22 INTERCEPTION 23 ELECTRONIC COUNTERMEASURES (ECM) 24 POLICING 25 CONVENTIONAL ATTACK 26 MEDICAL EVACUATION (MEDEVAC) 27 MINE COUNTERMEASURES 28 SEARCH 29 REFUELING/TANKING 30 INTERDICTION 31 COMBAT AIR PATROL (CAP) 32 FORWARD AIR CONTROLLER (FAC) 33 VERY IMPORTANT PERSON (VIP) FLIGHT 34 NONCOMBATANT OPERATIONS 35 CLOSE AIR SUPPORT (CAS) 36 AIRBORNE EARLY WARNING (AEW) 37 GROUND ATTACK TACTICS (GAT) 38 AIRBORNE COMMAND POST (ACP) 39 RESCUE COMBAT AIR PATROL (RESCAP) 40 SURFACE COMBAT AIR PATROL (SUCAP) 41 TANKING 42 SPOTTING 43 STRIKE WARFARE 44 SPECIAL 45 HIJACK 46 JAMMER 47 TROOPLIFT 48 XRAY 49 ANTIAIR WARFARE (AAW) 50 COMMAND AND CONTROL 51 COUNTER-AIR WARFARE 52 RETURN TO BASE (RTB) 53 MINE WARFARE 54 CHAFF LAYING 55 VIDEO DATA LINKING 56 DIPPING 57 RESCUE HELO 58 ORBITING 59 UNDER RECALL 60 ENGAGING 61 ENGAGING (PRIORITY KILL) 62 INVESTIGATING 63 CLEARED TO DROP 64 INTERVENING 65 DIVERTING 66 AIR-TO-GROUND 67 AIR-TO-AIR 68 PRECISION BOMBING 69 LASER DESIGNATION 70 BEACON BOMBING


COMSOFT CAT 204-V1.0/02.04.2012 49

71 SHADOWING 72 COVERING 73 VISUAL IDENTIFICATION 74 HIGH ENERGY LASING 75..114 UNDEFINED 115..126 AIR ACTIVITY 1 .. AIR ACTIVITY 12

127 RESET TO NO STATEMENT

NOTE - Depends on the environment category defined in 204/080.


Platform Type

Octet no 1

8 7 6 5 4 3 2 1

TYP

bits-8/1 (TYP) See [R7], DFI 1797/DUI 001 (for Air), 002 (for Surface), 003 (for Subsurface), 004 (for Land), 005 (for Space).

E.g.:

1 = Troop concentration/Unit for land

1 = Aircraft Carrier (CV) for maritime

1 = Submarine prop. unknown for subsurface

1 = Satellite for space


0 NO STATEMENT 1 FIGHTER 2 FIGHTER BOMBER 3 ATTACK 4 BOMBER 5 RECONNAISSANCE 6 TANKER 7 TANKER (BOOM ONLY) 8 TANKER (DROGUE ONLY) 9 INTERCEPTOR 10 TRANSPORT 11 AIRBORNE COMMAND POST (ACP) 12 MISSILE CARRIER 13 MISSILE 14 ELECTRONIC WARFARE (EW)


50 CAT 204-V1.0/02.04.2012 COMSOFT

15 ANTISUBMARINE WARFARE (ASW) 16 AIRBORNE EARLY WARNING AND CONTROL (AEW&C) 17 MARITIME PATROL AIRCRAFT (MPA) 18 SEARCH AND RESCUE (SAR) 19 DRONE 20 REMOTELY PILOTED VEHICLE (RPV) 21 FIXED WING GUNSHIP 22 CIVIL, AIRLINER 23 CIVIL, GENERAL 24 LIGHTER THAN AIR (LTA) 25 GLIDER 26 DECOY 27 HELICOPTER (HELO) 28 ATTACK HELICOPTER 29 HELICOPTER GUNSHIP 30 ANTISUBMARINE WARFARE HELICOPTER (ASW HELO) 31 MINE WARFARE HELICOPTER 32 TRANSPORT HELICOPTER 33 TACTICAL SUPPORT 34 PATROL 35 MISCELLANEOUS FIXED WING 36 MISSILE CONTROL UNIT 37 SURFACE-TO-AIR MISSILE (SAM) 38 AIR-TO-SURFACE MISSILE (ASM) 39 SURFACE-TO-SURFACE MISSILE (SSM) 40 LOGISTIC 41 AIR-TO-AIR MISSILE (AAM) 42 SUBSURFACE-TO-SURFACE MISSILE 43 SURFACE-TO-SUBSURFACE MISSILE 44 CRUISE MISSILE 45 BALLISTIC MISSILE 46 AIRBORNE LAND SURVEILLANCE 47 AIRBORNE LASER 48..62 UNDEFINED

63 RESET TO NO STATEMENT



COMSOFT CAT 204-V1.0/02.04.2012 51


Specific Type


16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1

STYP

bits-16/1 (STYP) See [R7],

DFI 804 DUI 001 (for Air), DFI 808 DUI 001 (for Surface), DFI 809 DUI 001 (for Subsurface), DFI 810 DUI 001 (for Land), DFI 749 DUI 002 (for Space).

E.g.:

1 = F-4 PHANTOM II for Air Platform

1 = TOW for Land

1 = CV GENERAL for Maritime

1 = SS GENERAL for Subsurface

1 = FROG 7 for Space



52 CAT 204-V1.0/02.04.2012 COMSOFT


Nationality Alliance

Octet no 1

8 7 6 5 4 3 2 1

NAT

bits-8/1 (NAT) See [R7], DFI 748 DUI 001 (Intelligence data J6.0).


0 NO STATEMENT 1..28 TBD by individual theater of operation 29 DISUSED 30 USSR (Soviet Union) 31 NATO 32 BELGIUM 33 CYPRUS 34 DENMARK 35 FRANCE 36 GERMANY 37 FINLAND 38 GREECE 39 ICELAND 40 IRELAND 41 ITALY 42 NETHERLANDS 43 NORWAY 44 PORTUGAL 45 SPAIN 46 SWEDEN 47 SWITZERLAND 48 TURKEY 49 UNITED KINGDOM 50 ALBANIA 51 AUSTRIA 52 BULGARIA 53 CZECHOSLOVAKIA 54 DISUSED 55 HUNGARY 56 POLAND 57 ROMANIA 58 YUGOSLAVIA 59 CANADA 60 UNITED STATES OF AMERICA 61 EGYPT 62 IRAN 63 IRAQ 64 ISRAEL


COMSOFT CAT 204-V1.0/02.04.2012 53

65 JORDAN 66 LEBANON 67 SAUDI ARABIA 68 SYRIA 69 ALGERIY 70 ETHIOPIA 71 LIBERIA 72 LIBYA 73 SOUTH AFRICA 74 INDIA 75 PAKISTAN 76 CAMBODIA 77 LAOS 78 THAILAND 79 VIETNAM 80 CHINA; PEOPLE'S REPUBLIC 81 CHINA; REPUBLIC 82 KOREA NORTH 83 KOREA REPUBLIC 84 JAPAN 85 PHILIPPINES 86 AUSTRALIA 87 NEW ZEALAND 88 ARGENTINA 89 BRAZIL 90 CHILE 91 COLUMBIA 92 MEXICO 93 PANAMA 94 PERU 95 VENEZUELA 96 CUBA 97 DOMINICAN REPUBLIC 98 UNITED NATIONS FORCE 99 KUWAIT 100 YEMEN ARAB REPUBLIC 101 GUINEA 102 MALAGASY (MADAGASCAR) 103 MAROCCO 104 NIGERIA 105 SENEGAL 106 ZIMBABWE 107 SPANISH NORT AFRICA 108 SUDAN 109 TANZANIA 110 TUNISIA 111 UGANDA 112 BURMA 113 INDONESIA 114 MALAYSIA 115 SINGAPORE 116 BOLIVIA 117 ECUADOR


54 CAT 204-V1.0/02.04.2012 COMSOFT

118 GUATEMALA 119 NICARAGUA 120 PARAGUAY 121 URUGUAY 122 JAMAICA 123 INTERNATIONAL RED CROSS 124 LUXEMBOURG 125 YEMEN; PEOPLE'S DEMOCRATIC REPUBLIC 126 UNDEFINED 127 RESET TO NO STATEMENT

Encoding Rule:


NOTES:

- A new DFI/DUI is created in STANAG 5516 Ed.6, to convey all possible nationalities


COMSOFT CAT 204-V1.0/02.04.2012 55

2.1.25 Data Item I204/170, Indicators Block

Definition:

Additional data for the track

Format:


Structure:


32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 0 0 0 0 IFFC IFF3 IFF2 IFF1 FIX C2 JAM EMER


16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 ENG EXER INT SPI SIF TN SIM F.TELL

bits-32/29 (Spare) 0

bit-28 (IFFC) 0 = no statement

1 = no IFFC reply from target

bit-27 (IFF3) 0 = no statement

1 = no IFF3 reply from target





bits-24/23 (FIX) 0 = no statement

1 = not used

2 = no field monitor transponder

3 = field monitor transponder

bits-21/21 (C2) 0 = no statement

1 = not used

2 = no

3 = yes

bits-20/19 (JAM) 0 =no statement

1 = not used

2 = not Jammed

3 = Jammed


56 CAT 204-V1.0/02.04.2012 COMSOFT

bits-18/17 (EMER) 0 = no statement

1 = not used

2 = emergency terminated

3 = emergency

bits-16/15 (ENG) 0 =no statement

1 = not used

2 = engage permissible

3 = engage inhibit

bits-14/13 (EXER) 0 =no statement

1 = not used

2 = no exercise

3 = exercise

bits-12/11 (INT) 0 =no statement

1 = not used

2 = no special interest

3 = special interest

bits-10/9 (SPI) 0 =no statement

1 = not used

2 = no special processing

3 = special processing

bits-7/8 (SIF) 0=no statement

1 = none

2 = PPLI IFF2 only

3 = PPLI IFF1 + IFF2 + IFF3

bits-6/5 (TN) 0 =no statement

1 = not used

2 = no PPLI track number

3 = PPLI track number

bits-4/3 (SIM) 0 =no statement

1 = not used

2 = no simulation

3 = simulation

bits-2/1 (F.TELL) 0 =no statement

1 = not used

2 = no force tell

3 = force tell

Encoding Rule:

This item is optional, if all bits are zero (no statement) the item can be omitted.


COMSOFT CAT 204-V1.0/02.04.2012 57

NOTES

Exercise indicator: Only tracks with a standard identity of friend can have the exercise

indicator set to one. For any track with the exercise indicator set to value 3, Exercise Track,

data concerning the track must be considered artificial, for exercise purposes, except that the

following shall not be artificial:

a. Track number

b. Tracking data: latitude, longitude, altitude/elevation/depth, course, speed, minute,

hour and track quality

c. Simulation indicator

d. Environment/category

e. Status data on air tracks: fuel function, fuel, time report function, minute and hour

f. Status data on surface (maritime) tracks: flight deck status, landing/approach

condition and associated time report function, minute and hour.

Special interest indicator: A track's identity can be further amplified by designated it as a

track of special interest. This is accomplished by setting the identity field as appropriate and

by setting the special interest indicator.

- Examples of employment of this indicator:

- Kilo/yoke – a friendly track of special interest.

- Traveller – a suspect surface track following a recognized traffic route.

- Zombie – a suspect air track conforming to ATC rules or outside NATO airspace

following a recognized traffic pattern.

Reply expected indicator: Implementation of "operational contingency constraints" in order

not to drop a TN when a J9.0 is pending.

Context:

The item was taken over from [R4] but modified: IFF1..IFFC, FIX (indicator for field monitor

transponder) were added, EMER was extended and for all information fields the state “no

statement” was added indicating that the information is not given. This is necessary as

information for a specific target (and so the information given in I204/170) can be split into

several ASTERIX records.


58 CAT 204-V1.0/02.04.2012 COMSOFT

2.1.26 Data Item I204/245, Target Identification

Definition:

Target (aircraft or vehicle) identification in 8 characters.

Format:


Structure:

Octet no 1

56 55 54 53 52 51 50 49

STI 0 0 0 0 0 0


48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33

Character 1 Character 2 Character 3/1


32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17

Char 3/2 Character 4 Character 5 Char 6/1


16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1

Character 6/2 Character 7 Character 8

bits-56/55 (STI) = 0 No Statement

= 1 Flight Plan Correlation

= 2 Operator Input

bits-48/1 Characters 1-8 (coded on 6 bits each) defining a target

identification when flight plan is available or the registration

marking when no flight plan is available.

Coding rules are provided in [R5] Section 3.1.2.9.1.2

Encoding Rule:

This Item is optional. It shall only be used if the Target Identification was not derived by the

aircraft i.e. I204/101 Subfield#2 is not present.

Context:

The item was taken over from [R3] but STI was modified.


COMSOFT CAT 204-V1.0/02.04.2012 59

2.1.27 Data Item I204/260, Object Status

Definition:

To define the status of the object: creation, update, lost, deletion.

Format:


Structure:

Octet no 1

8 7 6 5 4 3 2 1

STS

bits-8/1 (STS) 0 = No statement

1 = creation

2 = cyclic update

3 = event update

4 = deletion

5 = lost

Encoding Rule:


Context:



60 CAT 204-V1.0/02.04.2012 COMSOFT

2.1.28 Data Item I204/280, Update Time

Definition:

Time of last update of the object corresponding to its position

Format:


Structure:


64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49

TIME


48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33

TIME


32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17

TIME


16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1

TIME

bits-64/1 (TIME) Update Time in µs since 1970

Encoding Rule:

I204/280 shall be present in position related information.

Context:



COMSOFT CAT 204-V1.0/02.04.2012 61

2.1.29 Data Item I204/291, Track Data Ages

Definition:

Age of object report update.

Format:

Compound Data Item, comprising a primary subfield of up to 2 octet, followed by the indicated subfields.


Octet no 1

16 15 14 13 12 11 10 9

UPD AMSL IFF1 IFF2 IFF3 IFF4 IFFC FX

Octet no 2

8 7 6 5 4 3 2 1

COM ACS POS GAL MB 0 0 FX

bit-16 (UPD) Subfield#1: Age of the last detection used to update the track


bit-15 (AMSL) Subfield#2: AMSL Altitude age


bit-14 (IFF1) Subfield#4: IFF1 age








bit-10 (IFFC) Subfield#8: IFFC age

= 0 Absence of Subfield #7

= 1 Presence of Subfield #7


62 CAT 204-V1.0/02.04.2012 COMSOFT


= 1 Extension of Primary Subfield into next octet

bit-8 (COM) Subfield#8: Communications / ACAS Capability and Flight Status age


bit-7 (ACS) Subfield#9: ACAS Resolution Advisory Report age


bit-6 (POS) Subfield#10: Position Data age


bit-5 (GAL) Subfield#11: Geometric Altitude Data age


bit-4 (MB) Subfield#12: Mode S MB Data age




Encoding Rule:

The Item is optional.

NOTES:

- In all the subfields, the age is the time delay since the value was measured.

- Maximum value means maximum value or above.

Context:

Item I062/380 from [R3] was taken as a starting basis and reduced to the relevant

information within this context.


COMSOFT CAT 204-V1.0/02.04.2012 63


Octet no 1

8 7 6 5 4 3 2 1

UPD

bits-8/1 (UPD) Age of the last position detection used to update the track.

LSB = 1/4 s, Maximum value = 63.75 s


AMSL Altitude Age

Octet no 1

8 7 6 5 4 3 2 1

AMSL

bits-8/1 (AMSL) Age of the last 3D height detection used to update the track (I204/040).



IFF1 Age

Octet no 1

8 7 6 5 4 3 2 1

IFF1

bits-8/1 (IFF1) Age of the last valid and credible IFF1 code used to update the track (I204/090).



IFF2 Age

Octet no 1

8 7 6 5 4 3 2 1

IFF2




64 CAT 204-V1.0/02.04.2012 COMSOFT


IFF3 Age

Octet no 1

8 7 6 5 4 3 2 1

IFF3




IFF4 Age

Octet no 1

8 7 6 5 4 3 2 1

IFF4




IFFC Age

Octet no 1

8 7 6 5 4 3 2 1

IFFC

bits-8/1 (IFFC) Age of the last valid and credible IFF1 code used to update the track (I204/050).



COMSOFT CAT 204-V1.0/02.04.2012 65


Communications / ACAS Capability and Flight Status Age

Octet no 1

8 7 6 5 4 3 2 1

COM

bits-8/1 (COM) Age of the DAP “Communications / ACAS Capability and Flight Status” in I204/101.



ACAS Resolution Advisory Report Age

Octet no 1

8 7 6 5 4 3 2 1

ACS

bits-8/1 (COM) Age of the DAP “ACAS Resolution Advisory Report” in I204/101.



Position Age

Octet no 1

8 7 6 5 4 3 2 1

POS

bits-8/1 (POS) Age of the DAP “Position” in I204/101.



Geometric Altitude Age

Octet no 1

8 7 6 5 4 3 2 1

GAL

bits-8/1 (GAL) Age of the DAP “Geometric Altitude” in I204/101.



66 CAT 204-V1.0/02.04.2012 COMSOFT


Mode S MB Data Age

Octet no 1

8 7 6 5 4 3 2 1

MB

bits-8/1 (MB) Age of the DAP “Mode S MB Data” in I204/101.


Encoding Rule:



COMSOFT CAT 204-V1.0/02.04.2012 67

2.1.30 Data Item I204/400, Strobe Data

Definition:

Additional information for a strobe

Format:


Structure:


96 95 94 93 92 91 90 89 88 87 86 85 84 83 82 81

0 0 0 0 0 0 0 SIM DESC ORI ACCUR


80 79 78 77 76 75 74 73 72 71 70 69 68 67 66 65

EST RANGE


64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49

AZIMUTH


48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33

AZIMUTH WIDTH


32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17

AZ RATE


16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1

ELEVATION


bit-89 (SIM) 0 = live strobe

1 = simulated strobe

bits-88/86 (DESC) 0 = FIX

1 = AOP

2 = bearing not specified

3 = bearing ESM

4 = bearing ECM

5 = bearing radio direction finding

6 = track

7 = bearing unknown

bit-85 (ORI) 0 = origin TN

1 = origin lat/long


68 CAT 204-V1.0/02.04.2012 COMSOFT

bits-84/81 (ACCUR) The Bearing accuracy is stated as a numerical value from 1 to 15 with the higher values indicating the higher asset bearing accuracies. The asset bearing accuracy is represented in degrees of accuracy at a range of 300 data miles between the ESM receiver and the target emitter

0= No Statement

1 > 10.0°

2 <= 10.0°

3 <= 5.0°

4 <= 4.0°

5 <= 3.0°

6 <= 2.0°

7 <= 1.0°

8 <= 0.4°

9 <= 0.2°

10 <= 0.032°

11 <= 0.016°

12 <= 0.008°

13 <= 0.004°

14 <= 0.002°

15 <= 0.001°

bits-80/65 (EST RANGE) LSB = 500/216 km

bits-64/49 (AZIMUTH) LSB = 360°/65536

bits-48/33 (AZIMUTH WIDH) LSB = 360°/65536

bits-32/17 (AZ RATE) 16 bits signed integer in two’s complement

LSB =360°/32768 s

bits-16/1 (ELEVATION) 16 bits signed integer in two’s complement

LSB=180°/32768

Encoding Rule:


Context:

The item is based on [R4] but the accuracy of the fields was increased, the LSBs were

normalised and “AZ WIDTH” and “SIM” were added.


COMSOFT CAT 204-V1.0/02.04.2012 69

2.1.31 Data Item I204/620, Mission Weapon Engagement

Definition:

List of weapon engagement tracks paired to the track.

Format:



Octet no 1

8 7 6 5 4 3 2 1

REP

bits-8/1 (REP) Number of weapon engagement



96 95 94 93 92 91 90 89 88 87 86 85 84 83 82 81

0 ENV/CAT ROLE TYPE CNTN


80 79 78 77 76 75 74 73 72 71 70 69 68 67 66 65

CNTN


64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49

CNTN


48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33

CNTN


32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17

CNTN


16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1

STS WS

bit-96 Spare bit set to zero

bits-95/93 (ENV/CAT) 0 = no statement

1 = space

2 = air

3 = surface

4 = subsurface


70 CAT 204-V1.0/02.04.2012 COMSOFT

5 = land

bit-92 (ROLE) 0 = resource

1 = target

bits-91/89 (TYPE) 0 = track,

1 = point,

2 = SAD,

3 = detection,

4 = undefined

bits-88/17 (CNTN) CNTN or UIC of the paired track/point as a string value of 9 chars

bits-16/9

bits-8/1

(STS)

(WS)

weapon engagement status

0 = no statement,

1 = assigned,

2 = firing,

3 = covering,

4 = intervening,

5 = shadowing,

6 = investigating interrogating,

7 = broken,

8 = interrupted,

9 = heads up,

10 = tracking,

11 = effective,

12 = not effective

13 = partially effective

14 = undefined

weapon system

0 = no statement

1 =surface to air missile (SAM)

2 =surface to surface missile (SSM)

3= aircraft

4 = conventional (short range missiles or guns)

5 = antisubmarine warfare helicopter

6 = antisubmarine warfare missile

7 = depth charge / depth bomb

8 = torpedo

9 = fixed wing antisubmarine warfare aircraft

10 = laser


COMSOFT CAT 204-V1.0/02.04.2012 71

11 = beam weapon

12 = infrared decoy

13 = chaff

14 = spot jammer

15 = barrage jammer

16 = deception jammer

17 = interceptor

18 = air-to-surface missile (ASM)

19..31 = undefined

Encoding Rule:


NOTE:

CNTN is managed as a string. If the length of the string has not the maximum length of the

authorised size, padding characters to use shall be "\0".

If being empty, the information is not available.

The weapon engagement status provides the engagement status of a weapon against an objective.

Context:

The item was taken over from [R4] but the field “weapon system” was added. The content

was taken over from [R7] DFI 700 DUI 002. Descriptive information added.


72 CAT 204-V1.0/02.04.2012 COMSOFT

2.1.32 Data Item I204/630, Sensor List

Definition:

List of sensors identifiers.

Format:



Octet no 1

8 7 6 5 4 3 2 1

REP

bits-8/1 (REP) Number of Sensors



16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1

SAC SIC



Encoding Rule:


Context:

The item was taken over from [R4] .


COMSOFT CAT 204-V1.0/02.04.2012 73

2.1.33 Data Item I204/690, Resource Availability

Definition:

Availability of a resource.

Format:


Octet no 1

8 7 6 5 4 3 2 1

AV

bits-8/1 (AV) 0 = no statement

1 = available

2 = unavailable

3 = assigned

4 = unassigned

5 = assigned and available

6 = unassigned and unavailable

7 = mission completed

Encoding Rule:


Context:

The item was created to carry the corresponding Link-1 information.


74 CAT 204-V1.0/02.04.2012 COMSOFT

2.1.34 Data Item I204/700, Order Identifier

Definition:

To identify an order request / acknowledgement

Format:


Structure:


48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33

ACK TYPE


32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17

ID


16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1

ID

bit-48 (ACK) 0 = Order request

1 = Acknowledge of order request

bits-47/33 (TYPE) 0 = no order

1 = identification mode 4 request

2 = visual sighting

3 = manual identification report

4 = manual emergency point creation

5 = manual reference point creation

6 = manual track creation

7 = change manual to auto

8 = engagement inhibit

9 = discrete event

10 = drop/inhibit drop point

11 = drop TBM trajectory

12 = land point

13 = Manual NTR track creation

14 = Mode 5 request

15 = Measurement request

16 = Sensor settings

17 = Reference Point Associate

18 = Land point


COMSOFT CAT 204-V1.0/02.04.2012 75

19 = Change NTN

20 = Assign new NTN

21 = Change Amplifying Data

22 = Exchange Basic data

23 = Track Filter

24 = Single Track Request Type1




28 = SIF request

bits-32/1 (ID) Unique identifier of the order

Encoding Rule:

This Item is mandatory for commands.

Context:



76 CAT 204-V1.0/02.04.2012 COMSOFT

2.1.35 Data Item I204/710, Acknowledgement Designator

Definition:

Used in commands to specify the type of Acknowledgment

Format:


Structure:

Octet no 1

8 7 6 5 4 3 2 1

AD

bits-8/1 (AD) 0 = Acknowledgement not required

1 = Acknowledge Receipt

2 = Receipt Acknowledged

3 ... 255 not assigned

Encoding Rule:

This Item is mandatory for commands.

Context:

The item was created to carry the corresponding Link-1 information. It is similar to I201/205

(Reply Expected) in [R4]


COMSOFT CAT 204-V1.0/02.04.2012 77

2.1.36 Data Item I204/720, Track Filter Designator

Definition:

Used in "Track Filter" commands to specify the filter condition.

Format:


Structure:

Octet no 1

8 7 6 5 4 3 2 1

S/S R/S NTN ID RTT 0 0 0

bit-8 (S/S) 0 = start

1 = stop

bit-7 (R/S) 0 = request

1 = suppress

bit-6 (NTN) 0 = default value

1 = filter by NTN specification (I204/730)

bit-5 (ID) 0 = default value

1 = filter by Identity (I204/070, I204/170) specification

bit-4 (RTT) 0 = default value

1 = filter Raid Tape Target

bits-3/1 spare

Encoding Rule:

This Item is mandatory for "Track Filter" command.

Context:



78 CAT 204-V1.0/02.04.2012 COMSOFT

2.1.37 Data Item I204/730, NTN Specifier

Definition:

Used in commands to specify or change NATO track numbers of targets

Format:

Variable length Data Item comprising a first part of 3 – Octets, followed by 3 octets extents

as necessary.

Structure:

Octet no 1

24 23 22 21 20 19 18 17

0 0 0 C1


16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1

C2 C3 C4 C5 0 FX

bits-24/22 (C1) Spare bits set to 0

bits-21/17 (C2) NATO Track Number - 1st character

bits-16/12 (C3) NATO Track Number - 2nd character

bits-11/9 (C4) NATO Track Number - 3rd character


bits-5/3 NATO Track Number – 5th character

bit-2 Spare bit set to 0

bit-1 (FX) = 0 End of Data Item

= 1 Extension into first extent

Encoding Rule:

This Item is mandatory for "Change / Specify NATO Track Number" commands.

Context:



COMSOFT CAT 204-V1.0/02.04.2012 79

2.1.38 Data Item I204/740, Relayed Data Source Identifier

Definition:

Identification of the data source for which data is relayed

Format:


Structure:


16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1

SAC SIC



Encoding Rule:

This Item shall be present in case of message relay.

Context:

The item was added to support message relay e.g. being implemented in Link-1 for S.14

change identity messages.


80 CAT 204-V1.0/02.04.2012 COMSOFT

2.2 User Application Profile for CAT 204

FRN Data Item Description Length

1 I204/010 Data Source Identifier 2

2 I204/012 Data Destination Identifier 2

3 I204/000 Message Identification 2

4 I204/001 NATO Track Number 4

5 I204/700 Order Identifier 6

6 I204/003 Track/Point/EW id 2

7 I204/260 Object Status 1

FX - Field extension indicator -

8 I204/280 Update Time 8

9 I204/020 Position in WGS-84 Co-ordinates 8

10 I204/030 Track Quality 1

11 I204/060 Speed/Heading 8

12 I204/070 Primary Identity 2

13 I204/080 Environment/Category 1

14 I204/040 AMSL Altitude 4


15 I204/291 Track Data Ages 1+

16 I204/050 IFFC 2

17 I204/081 Object Type 1

18 I204/082 Track Mode 1

19 I204/083 Detection Kind 1

20 I204/084 Strength 3

21 I204/090 IFF1 2


22 I204/091 IFF2 3

23 I204/092 IFF3 3

24 I204/093 IFF4 2

25 I204/094 Mode-5 1+


COMSOFT CAT 204-V1.0/02.04.2012 81

FRN Data Item Description Length

26 I204/101 Aircraft Derived Data 1+

27 I204/130 Secondary Identity Information 1+

28 I204/170 Indicators Block 4

FX -

29 I204/620 Mission Weapon Engagement 1+12*n

30 I204/245 Target Identification 7

31 I204/630 Sensor List 1+2*n

32 I204/690 Resource Availability 1

33 I204/085 Size 3

34 I204/400 Strobe Data 12

35 I204/710 Acknowledgement Designator 1

FX -

36 I204/720 Track Filter Designator 1

37 I204/730 NTN Specifier 3+

38 I204/740 Relayed Data Source Identifier 2

39 Spare

40 Spare

41 Spare

42 Spare

FX -

Table 2: Recognized Air Picture UAP (RAP-UAP)


82 CAT 204-V1.0/02.04.2012 COMSOFT

Final Page !

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