glast lat projectisoc cdr, 4 august 2004 document: lat-pr-04500section 21 glast large area...

GLAST LAT Project ISOC CDR, 4 August 2004

Document: LAT-PR-04500 Section 2 1

GLAST Large Area Telescope:GLAST Large Area Telescope:

Instrument Science Operations CenterInstrument Science Operations CenterCDRCDR

Section 2 Requirements

Jim [email protected]

Gamma-ray Large Gamma-ray Large Area Space Area Space TelescopeTelescope



LAT Specification TreeLAT Specification Tree

55 Level II Requirements379 Level III Requirements

Mission System Specification

433-SPEC-0001

Science Requirements

Document433-SRD-0001

LAT-SC Interface Requirements

Document433-IRD-0001

LAT Performance Specification

LAT-SS-00010

LAT Environmental Specification

LAT-SS-00778

LAT ISOC Performance Specification

LAT-SS-00015

ACD Subsystem Specification

LAT-SS-00016

TKR Subsystem Specification

LAT-SS-00017

CAL Subsystem Specification

LAT-SS-00018

Trigger & Dataflow Subsystem

SpecificationLAT-SS-00019

SASSubsystem


ISOCSubsystem


PowerSubsystem


MechanicalSubsystem


Mis

sio

nL

AT

LA

T S

ub

syst

em

Science Rqmts

Mission Rqmts

Interface Rqmts

Interface Rqmts

TCS Performance Specification

LAT-SS-00715

Operations Data Products (ICD)

LAT-SC Interface Control

Documents

Ground System Requirement Documents

433-RQMT-0006

Science Data Products (ICD)

LATLEVEL

I

II

III



Level II RequirementsLevel II Requirements

Level II

Science Operations 6

Instrument Operations 17

Analysis Software and Data Processing 19

Interfaces 3

Data Standards and Data Format Standards 7

Availability and Reliability 1

Automation 1

Security 1

TOTAL 55



Driving RequirementsDriving Requirements

4.3.7 - LAT Instrument Commanding– Generate LAT instrument commands and identify procedures to direct the safe upload

of the commands. 4.3.9 - LAT Instrument Flight Software

– Maintain, update, and validate the operation and performance of the LAT flight software. 4.3.10 - LAT Instrument Simulator

– Maintain an instrument simulator for validating and verifying changes to flight software and command procedures, and also for use in anomaly resolution.

4.4.1 - Level 0 Data Processing– Receive Level 0 data from the MOC post-pass and process the data into Level 1 event

data within 24 hours of receipt from the MOC. 4.4.2 - Real-time Housekeeping Data

– Autonomously receive real-time housekeeping data in near real-time from the MOC and process the data for diagnostic use.

4.4.6 - Instrument Response Simulation– Develop and maintain software to simulate the detailed response of the LAT to charged

particles and gamma rays. 4.4.5 - Event Reconstruction and Classification

– Develop algorithms to interpret the subsystem responses, apply calibration constants, and to find and identify incident photons.



REQUIREMENTS – Level II – LAT-SS-00015REQUIREMENTS – Level II – LAT-SS-00015

Science Operations# Title Summary Verification

4.2.1 LAT Instrument Calibration

Produce, monitor and update calibration constants for the instrument

T

4.2.2 Instrument Response Functions (IRFs)

Generate IRFs needed for science analysis T

4.2.3 LAT Instrument Performance

Assess the LAT instrument performance and compare actual performance against predicted performance.

T

4.2.4 LAT Instrument Optimization

Optimize the LAT instrument in response to in-flight changes in hardware as described in the ISOC Operations Plan, LAT-SS-01378.

T

4.2.5 Performance Records Archive data on the performance and calibration of the LAT instrument.

D

4.2.6 Retrieval of Archived Records

Retrieve archived performance and calibration data at a rate of at least 1 GB in 60 minutes.

T




Instrument Operations – 1/3

# Title Summary Verification

4.3.1 Health and Safety Monitoring

Monitor the health and safety of the instrument.

T

4.3.2 Housekeeping Data Process and analyze LAT housekeeping data.

T

4.3.3 Operating Limits Define the operating limits for the LAT instrument.

T

4.3.4 Anomaly Response Monitor for and respond to anomalous configurations or states.

T

4.3.5 Operations Records Maintain records of the operation and health of the LAT instrument.

D

4.3.6 LAT Instrument Configuration

Maintain the status of on-board operating parameters and control the configuration of the LAT instrument.

T




Req't # Title Summary Verif. Method

4.3.7 LAT Instrument Commanding

Generate LAT instrument commands and identify procedures to direct the safe upload of the commands.

T

4.3.8 Telemetry and Command Databases

Develop and maintain command and telemetry databases used for generating LAT instrument commands and analyzing the health, performance, and operation of the LAT instrument.

T

4.3.9 LAT Instrument Flight Software

Maintain, update, and validate the operation and performance of the LAT flight software.

T

4.3.10 LAT Instrument Simulator

Maintain an instrument simulator for validating and verifying changes to flight software and command procedures, and also for use in anomaly resolution.

D






4.3.11 Mission Operations Provide mission operation support for the LAT instrument.

4.3.11.1 Command Uplink Provide instrument command uploads to the GSSC for on-orbit instrument operations and to the MOC during pre-launch test and early orbit periods.

T

4.3.11.2 Command Scheduling Coordinate LAT commanding schedules with the GSSC.

T

4.3.11.3 Anomalies Coordinate the resolution of LAT instrument anomalies with the MOC.

D

4.3.11.4 Pre-Launch Activities Provide personnel and facilities to support pre-launch interface and system test activities.

D

4.3.11.5 On-orbit Checkout Perform initial tests and analysis of LAT instrument operation and performance during an on-orbit checkout period of 60 days.

T

4.3.11.6 Operational Period Support an on-orbit operational lifetime of a minimum of 5 years following an initial period of on-orbit checkout.

T






4.4.1 Level 0 Data Processing Receive Level 0 data from the MOC post-pass and process the data into Level 1 event data within 24 hours of receipt from the MOC.

T

4.4.1.1 Data Quality Evaluate the quality of the Level 0 data and determine if retransmission of the data from the MOC is required.

T

4.4.1.2 Retransmitted Level 0 Data

Process retransmitted Level 0 data within 24 hours of receipt from the MOC.

T

4.4.1.3 Duplicate Level 0 Data Process Level 0 data received from the MOC that duplicates or overlaps portions of previously received Level 0 data.

T

4.4.2 Real-time Housekeeping Data

Autonomously receive real-time housekeeping data in near real-time from the MOC and process the data for diagnostic use.

T

4.4.3 Unfiltered Data Process unfiltered data generated by the instrument hardware trigger.

T

Analysis Software and Data Processing – 1/3





4.4.4 Level 1 Data Processing Maintain a processing pipeline for event reconstruction and classification.

D

4.4.5 Event Reconstruction and Classification

Develop algorithms to interpret the subsystem responses, apply calibration constants, and to find and identify incident photons.

T

4.4.6 Instrument Response Simulation

Develop and maintain software to simulate the detailed response of the LAT to charged particles and gamma rays.

T

4.4.7 Level 2 Data Processing Maintain a processing pipeline for Level 2 analysis tasks that can be automated, such as searching for transient sources, monitoring the in-flight IRFs, and refining information about alerts for transient sources generated by the instrument.

D

4.4.8 Science Analysis Tools Develop and provide to the GSSC and LAT team science analysis tools to analyze Level 1 data.

D

4.4.9 Science Data Format Provide Level 1 and Level 2 data to GSSC and the LAT team in an agreed upon format.

T






4.4.10 LAT Mirror Sites Provide data to any associated international or domestic mirror sites provided as part of the LAT team efforts.

D

4.4.11 Data Storage Archive all raw data and processed data products for the duration of the mission.

D

4.4.12 Pre-launch Test and Calibration Data

Archive LAT test and calibration data obtained during pre-launch testing.

T

4.4.13 Alerts Receive and process LAT alert messages. T

4.4.13.1 Validating Alerts Use LAT science data to validate and refine the scientific alert information.

T

4.4.13.2 Submitting Alerts to GCN

Transmit refined scientific alerts to the Gamma Ray Burst Coordinates Network (GCN).

T

4.4.13.3 Instrument Alerts Receive, process, and respond to LAT instrument alert messages.

T





Req't #

Title Summary Verif. Method

4.5.1 GSSC, LAT Team, and LAT Mirror Site Interface for Science Data Products

Interface with the GSSC, LAT team, and LAT mirror sites to provide and receive science data products.

D

4.5.2 GSSC Interface for Operational Data Products

Interface with the GSSC to provide and receive operational data products, including instrument commands.

D

4.5.3 MOC Interface for Operational Data Products

Interface with the MOC to provide and receive operational data products.

D

Interfaces





4.6.1 Coordinate System Use the J2000 inertial coordinate system as the basis for identifying and reporting celestial objects and of communicating pointing directions.

T

4.6.2 Use of Metric Units Per NASA policy directive NPD 8010.2B, use metric in all data processing and design calculations in the LAT ISOC.

T

4.6.3 Time Base Use UTC as the time base for operations T

4.7.1 Communications Format and Protocol

Employ the standard communications format and protocol as recommended by CCSDS for telemetry and telecommands.

T

4.7.2 Variable Length Packets Accept and accommodate variable CCSDS length packets for science, housekeeping, and alert data.

T

4.7.3 Software Upload Formats Format software uploads in blocks as specified by the MOC.

T

4.7.4 Science Analysis Tools Formats

Adhere to standards that ensure software portability, independence of vendor and compatibility with existing multi-mission high energy astrophysics tools.

D

Data and Data Format Standards





4.8 Availability and Reliability

Maintain ISOC facilities for the entire mission lifetime with no loss in ISOC capability or performance.

A

4.9 Automation Accept autonomous data transfers from the MOC.

T

4.10 Security Connect to the other operations and support centers by an intranet of wide area networks that is closed to, or protected from, public users of the external internet per NASA NPD 2810.1.

T

Availability, Reliability, Automation, Security



REQUIREMENTS – Level III – LAT-SS-00021REQUIREMENTS – Level III – LAT-SS-00021

# of Level III

3.1

3.1.1

3.1.2

3.1.3

3.1.4

3.1.5

3.1.6

3.1.7

Configuration and Architecture

Interface

Facilities

Redundancy

Security

Database

Website

Documentation

60

10

11

6

6

5

6

4

3.2

3.2.1

3.2.2

3.2.3

3.2.4

Mission Planning & Scheduling

Flight Dynamics

TDRSS scheduling

Target of Opportunity

Stored Command Load Generation

62

3

2

8

49




# of Level III

3.3

3.3.1

3.3.2

3.3.3

3.3.4

3.3.5

3.3.6

Telemetry, Command & Data Processing

Telemetry Processing

Data Processing

Data Archiving

Alert Telemetry Monitoring

User Interface Language

Commanding

85

29

19

10

1

22

4

Continued – 2/3




# of Level III

3.4

3.4.1

3.4.2

3.4.3

3.4.4

3.4.5

3.4.6

3.4.7

3.4.8

3.4.9

3.4.10

3.4.11

Monitoring and Analysis

Ground System Monitoring

Display Pages

Sequential Prints

Event Messages

Memory Mapping & Maintenance

Limit Monitoring

Configuration Monitoring

Trending & Analysis

Anomaly Tracking & Notification

Timeline Monitoring

Calibration & Performance

176

4

38

15

13

7

14

15

32

29

3

6

Continued – 3/3



SummarySummary

Requirements are in the signature cycle– Review and update as needed after GSDR

Development approach tailored to Level III Ready to develop

glast lat projectisoc cdr, 4 august 2004 document: lat-pr-04500section 21 glast large area...

Documents

lat instrument performance

lat instrument simulator

lat instrument commands

lat instrument commanding

lat instrument optimization

requirements lat level

lat housekeeping data

lat instrument flight