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GLAST Large Area Telescope: LAT System Engineering Pat Hascall SLAC System Engineering

This report provides the current status of action items, technical baselines, interface control documentation, and risk management for the GLAST Large Area Telescope system engineering. It also includes updates on deliverables, verification status, key design metrics, and risk management activities.

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GLAST Large Area Telescope: LAT System Engineering Pat Hascall SLAC System Engineering

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  1. Gamma-ray Large Area Space Telescope GLAST Large Area Telescope: LAT System Engineering Pat Hascall SLAC System Engineering

  2. Topics • Action Item Status • Technical Baseline Management • Issues • Interface Control Documentation • RFA Closure • Key Metrics • Risk Management

  3. Monthly Action Item Status

  4. Issues

  5. Issues (continued)

  6. Interface Management

  7. Interface Document Status • SC-LAT ICD ICN Status • LAT signed this month • None • Currently under signature review • None • Currently in draft or revision • ICN-087 LAT Deliveries Table • ICN-095 Grid Hole Position • Spectrum reviewing draft • ICN-097 MLI Interface • Spectrum reviewing draft • Internal LAT ICD’s • Signed off this month • None • Currently in signature review • None • Currently in update • Electronics-LAT ICD (Comments being incorporated as they are received)

  8. Deliverables/Receivables • LAT Deliverables • Aug: None Scheduled • Sept: Return SC Interface Tool to SASS • Oct: None Scheduled • Nov: None Scheduled • LAT Receivables • Aug: None Scheduled • Sept: None Scheduled • Oct: None Scheduled • Nov: None Scheduled

  9. LAT Level Verification Status • Primary requirement verification effort has been the generation of Verification Plans. • Issues regarding flow-down of requirements continue to be worked. • NASA review of VCRM resulted in 4 Draft Verification Plan requirements were moved from Demonstration to Test. • Progress since last month • Requirements Identified : No Additional Requirements • Flow Down Complete : No Additional Requirements • Draft Verification : Additional 2 Requirements • Final Verification: No Additional Requirements • Verification Plan Executed : No Additional Requirements • Requirement Sold: No Additional Requirements

  10. Key Design Metrics

  11. Mass and Power Status Summary • Mass • No change • Power • LAT Power Consumption Estimate has decreased by 0.1 W • A margin of 10.4% exists to LAT Power Allocation with 76% of the Estimated Power measured. • FSW estimates updated • No change

  12. LAT Mass Status

  13. LAT Power Status LAT Power Consumption Estimate has decreased by 0.1 W. • TKR Estimate decrease by 0.2 W based on average of measured modules. • CAL Estimate increase by 0.1 W based on measured average of all modules. • T&DF Estimate decrease by 0.1W based on 8 Tower measured data.

  14. Measured LAT Power • 1. Tower measurements for bays 0,1,4,5,8,9,12,13 are consistent and supported by predicts

  15. Survival Power LAT Power Status (Continued)

  16. FSW Resource Usage Current Estimates * Storing multiple copies (4 currently to use available memory) for risk mitigation

  17. Instrument Bandwidth Resources • LAT communication, bandwidth (BW) in Mbyte/sec * Present performance of event filter for EPU-CPU, still being optimized. Eventually the physics filter will be adjusted/loosened to take advantage of the max average bandwidh EBM: Event-Builder Module EPU: Event-Processing Unit SIU: Spacecraft Interface Unit

  18. Key Science Performance Metrics

  19. Risk Management

  20. Risk Management Activity • Reduced ASIC qualification risk from moderate to low • Reduced TPS qualification risk from moderate to low

  21. Top risks

  22. Top risks

  23. Top risks

  24. Top risks

  25. Top risks

  26. Cost Report

  27. Cost Variance Explanation • Why overrun/underrun? • On plan • What will be done to correct? • None needed

  28. FTE Report

  29. FTE Variance Explanation • Why overrun/underrun? • On plan • What is the impact? • None • What will be done to correct? • No correction required

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