GLAST Large Area Telescope:

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Presentation transcript:

GLAST Large Area Telescope: Gamma-ray Large Area Space Telescope GLAST Large Area Telescope: Instrument System Engineering Tim Thurston Stanford Linear Accelerator Center Stanford University LAT Instrument System Engineer Thurston@slac.stanford.edu

Instrument System Engineering Outline Requirements &Subsystem Reviews Design Integration Systems Analysis Configuration Management & Control Next Quarter Plan

Requirements Reviews – Level III Subsystem Requirements Reviews. ACD Completed March 20 Tracker Completed March 22 Calorimeter Completed March 28 Science Analysis Software Completed April 20 Electronics & DAQ Completed April 25 Mechanical Completed May 2 IOC Completed May 3

Subsystem PDR’s (Peer Reviews) Subsystem Preliminary Design Reviews (SS-PDR) Tracker Complete - June 19 ACD Complete - July 26 Performance and Simul. Complete - July 26 Calorimeter Complete – July 27 Mechanical August 15 Electronics, DAQ, & Flt S/W August 16 IOC& Science Analysis S/W August 17 Instrument Preliminary Design Review ( I-PDR) Draft Submittal Mid September PDR Submittal Week of October 8 I-PDR/Baseline Review Week of October 29

LAT SPECIFICATION TREE Level I Project Specifications Program Plan Requirements Level II System Specifications Level II(a) System Operations Concept Document 433-OPS-0001 Science Req’ts Document 433-SRD-0001 Mission Assurance Requirements 433-MAR-0001 Mission System Specification 433-SPEC-0001 Level II(b) Element Spacecraft Performance Spec. LV Interface Specification LAT-SC IRD 433-IRD-0001 GBM Instrument Performance Spec. Science Support Center Spec. SGL Comm Interface Spec. Mission Operations Center Spec. GBM IOC Specification * LAT Instrument Performance Spec. LAT-SS-00010 LAT IOC Performance Spec. LAT-SS-00015 * * Level III Subsystem Specifications * * LAT - ACD Spec. LAT-SS-00016 LAT - TKR Spec. LAT-SS-00017 LAT - CAL Spec. LAT-SS-00018 * LAT Subsys. ICD LAT-SS-00137 LAT SAS Spec. LAT-SS-00020 * * * * * * LAT - T&DF Spec. LAT-SS-00019 LAT Mech. Spec. LAT-SS-00115 * LAT IOC Spec. LAT-SS-00021 * SS-PDR Complete Level IV Design Specifications LAT Design Spec. LAT-SS-00??? LAT Design Spec. LAT-SS-00??? LAT Design Spec. LAT-SS-00??? * LIII Spec. Review Complete LAT Design Spec. LAT-SS-00??? LAT Design Spec. LAT-SS-00??? LAT Design Spec. LAT-SS-00??? LAT Design Spec. LAT-SS-00??? LAT Design Spec. LAT-SS-00???

Integration Issues IDT issues addressed over past quarter: SAA protection Scenario Subsystem Interface – Module pitch adjustment, ACD envelope change Performance simulation parameters identified Interface definitions matrix drafted Concept, system & design documentation Operational scenarios and concepts

Integration Issues

System Analysis Efforts continue to identify the necessary system analyses for validation and verification. Areas under review are: Instrument degradation and performance impact Command, control and data interfaces Autonomy functions and processes Operating modes and transition Data triggering, filtering, collection, archiving and dissemination Health monitoring and command processing Non-standard operating modes – primarily those associated with component(s) or partial system failure. Operation anomalies – Ground and Onboard

System Analysis Risk and Reliability FEMA working group was formed. Subsystem reliability and operability targets were established. Reliability block diagrams for subsystems have been drafted. Critical elements are being addressed. No single point failure exist for the LAT instrument. The performance degradation associated with component failures is being analyzed. This is expected to continue beyond PDR. With the conservative margin of the LAT design, the LAT reliability targets should be easily achieved.

Configuration Management and Control Document, Requirements, and Change Control LAT Document Management System (LDMS) is up and operational. LDMS provides WEB capture and distribution for all LAT document. Change Procedures are being utilized. SE is the control point for controlled documents. DOORS requirements tracking tool is operational. Requirements are yet to be loaded in to the tool. Data capture & control No progress since last quarterly review.