Recommendation ITU-R M.1802-1(04/2010)

Characteristics and protection criteria for radars operating in the radiolocation service

in the frequency band 30-300 MHz

M SeriesMobile, radiodetermination, amateur

and related satellite services

ii Rec. ITU-R M.1802-1

Foreword

The role of the Radiocommunication Sector is to ensure the rational, equitable, efficient and economical use of the radio-frequency spectrum by all radiocommunication services, including satellite services, and carry out studies without limit of frequency range on the basis of which Recommendations are adopted.

The regulatory and policy functions of the Radiocommunication Sector are performed by World and Regional Radiocommunication Conferences and Radiocommunication Assemblies supported by Study Groups.

Policy on Intellectual Property Right (IPR)

ITU-R policy on IPR is described in the Common Patent Policy for ITU-T/ITU-R/ISO/IEC referenced in Annex 1 of Resolution ITU-R 1. Forms to be used for the submission of patent statements and licensing declarations by patent holders are available from http://www.itu.int/ITU-R/go/patents/en where the Guidelines for Implementation of the Common Patent Policy for ITU-T/ITU-R/ISO/IEC and the ITU-R patent information database can also be found.

Series of ITU-R Recommendations

(Also available online at http://www.itu.int/publ/R-REC/en)

Series Title

BO Satellite delivery

BR Recording for production, archival and play-out; film for television

BS Broadcasting service (sound)

BT Broadcasting service (television)

F Fixed service

M Mobile, radiodetermination, amateur and related satellite services

P Radiowave propagation

RA Radio astronomy

RS Remote sensing systems

S Fixed-satellite service

SA Space applications and meteorology

SF Frequency sharing and coordination between fixed-satellite and fixed service systems

SM Spectrum management

SNG Satellite news gathering

TF Time signals and frequency standards emissions

V Vocabulary and related subjects

Note: This ITU-R Recommendation was approved in English under the procedure detailed in Resolution ITU-R 1.

Electronic Publication Geneva, 2010

ITU 2010

All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without written permission of ITU.

Rec. ITU-R M.1802-1 1

RECOMMENDATION ITU-R M.1802-1

Characteristics and protection criteria for radars operating in the radiolocation service in the frequency band 30-300 MHz

(Question ITU-R 237/5)

(2007-2010)

Scope

This Recommendation describes VHF radiodetermination radars and provides technical parameters and protection criteria for some type of radars operating in the band 30-300 MHz.

The ITU Radiocommunication Assembly,

considering

a) that technical characteristics of radars operating in the radiodetermination service depend on specific applications, and could significantly vary, even within the same frequency band;

b) that within different ITU Regions as well as in different countries certain frequency bands in the range 30-300 MHz are allocated to the radiodetermination service;

c) that the VHF range provides unique capabilities for detecting objects at a very large distance, that is the most suitable for tracking and identification of space objects;

d) that analysis of frequency sharing between radiodetermination radars and systems in other services and determination of the feasibility of implementing new types of radiodetermination radars and to select appropriate frequency bands require knowledge of technical and operational characteristics of the systems operating in a specific frequency band,

recommends

1 that technical and operational characteristics and protection criteria of the radiolocation radars described in Annex 1 should be considered representative of those systems operating in the frequency range 30-300 MHz and used in studies of compatibility with systems in other services;

2 that Recommendation ITU-R M.1461 should be used as a guideline in analysing compatibility between radars operating in the radiodetermination service with systems in other services.

Annex 1

Technical and operational characteristics and protection criteria of radar systems operating in the frequency range 30-300 MHz

1 Introduction

Representative characteristics of radiolocation radars operating in the frequency range 30-300 MHz are shown in Table 1. This information is required for assessment of compatibility between radars and systems in other services.

2 Rec. ITU-R M.1802-1

2 Technical characteristics

The frequency range 30-300 MHz is used by several different types of radars on fixed platforms within different ITU Regions as well as in different countries. Radiolocation functions performed in the band are space object recognition and tracing.

TABLE 1

Characteristics of radars operating in the frequency range 30-300 MHz

Parameter Value

Radar А Radar В Radar C

Radar type Primary ranging radar Primary ranging radar (bi-static)

Radar purpose Space object recognition and tracing

Frequency band (MHz) 154-156 142-144

Relative frequency instability 10–11 10–11 N/A

Output pulse power (min/max) (dBW) 27/46 40/46 47.2

Mean output power (min/max) (dBW) 22/41 35/41 47.2

Polarization Linear

Pulse duration (μs) 13 000 3 200 N/A

Duty cycle 0.322 N/A

Modulation type Pulse Continuous Wave

Altitude above the ground level (m) 19 5

Antenna type Phased array

Maximum antenna gain (dB) – transmitter – receiver

25 30

24

N/A

Maximum antenna gain on the horizon (dB) 9 12

Main beam pattern (degrees) – horizontal plane (Rx/Tx) – vertical plane (Rx/Tx)

2.6/5.2 2.6/2.6

±8

±20

Scan angle ranges (degrees): – horizontal plane – vertical plane

0-360 2-70

4 sectors covering:

0-180 30

Receiver noise temperature (K) 800 N/A

Operational receiver passband (kHz) 0.132 625 50

Necessary bandwidth (kHz) 0.132 625 < 1

Emission class P0N MXN N0N

I/N protection ratio (dB) −6

NOTE 1 – N/A – not applicable.