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GLAST LAT ProjectCDR/CD3 Review May 12-16, 2003 Document: LAT-PR-01967Section XX 1 GLAST Large Area Telescope: LAT System Engineering WBS 4.1.2 Dick Horn.

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Presentation on theme: "GLAST LAT ProjectCDR/CD3 Review May 12-16, 2003 Document: LAT-PR-01967Section XX 1 GLAST Large Area Telescope: LAT System Engineering WBS 4.1.2 Dick Horn."— Presentation transcript:

1 GLAST LAT ProjectCDR/CD3 Review May 12-16, 2003 Document: LAT-PR-01967Section XX 1 GLAST Large Area Telescope: LAT System Engineering WBS 4.1.2 Dick Horn SLAC System Engineering Manager Dhorn@slac.stanford.edu 650 926-8578 Gamma-ray Large Area Space Telescope

2 GLAST LAT ProjectCDR/CD3 Review May 12-16, 2003 Document: LAT-PR-01967Section XX 2 Topics LAT System Engineering Overview – D. Horn –Design Review Summary –Key System Performance Metrics –Configuration Management And Technical Baseline –Risk Management –Cost & Schedule Summary Requirements, Traceability & Interfaces System FMEA/PRA/Reliability T. Thurston System VerificationT Leisgang

3 GLAST LAT ProjectCDR/CD3 Review May 12-16, 2003 Document: LAT-PR-01967Section XX 3 LAT System Engineering Overview

4 GLAST LAT ProjectCDR/CD3 Review May 12-16, 2003 Document: LAT-PR-01967Section XX 4 Design Maturity Summary Fiscal Years 20002001200220032004200520062011 Begin LAT I&T Critical Design Review PDR PER PreShip Review LAT Ready For S/C I&T FABRICATION PHASECOMMISSIONING PHASE Build & Test Flight Units Observatory I&T Final Design Engr’g Models LAT I&T Ops. Prelim. & Sys. Design PDR Delta Baseline Review Subsystem CDR Peer Reviews SRR Mature & Stable Requirements Since SRR Interfaces With Spacecraft Established and Reflected in CDR Design

5 GLAST LAT ProjectCDR/CD3 Review May 12-16, 2003 Document: LAT-PR-01967Section XX 5 PDR & dPDR, Peer Review RFA Closure PDR RFA’s Submitted, xx of 57 Closed –Working with GSFC on residual issues: Calorimeter to grid attachment EMI/EMC box level acceptance test dPDR RFA’s Submitted, xx of 20 Closed –No design drivers identified –LAT Initial responses under review by GSFC Subsystem CDR Peer Review RFA’s SubsystemNumber Of RFA’s Status ACD19 Calorimeter30 Electronics/FSW26 Tracker39 Mechanical48

6 GLAST LAT ProjectCDR/CD3 Review May 12-16, 2003 Document: LAT-PR-01967Section XX 6 LAT Mass Status

7 GLAST LAT ProjectCDR/CD3 Review May 12-16, 2003 Document: LAT-PR-01967Section XX 7 LAT Power Status

8 GLAST LAT ProjectCDR/CD3 Review May 12-16, 2003 Document: LAT-PR-01967Section XX 8 FSW Resource Usage Current Estimates ResourceTotal AvailableAnticipated Usage Margin Factor EPU Boot PROM256 kB128 kB2 SIU Boot PROM256 kB128 kB2 EPU EEPROM4 MB1.5 MB2.7 SIU EEPROM8 MB1.5-2.5 MB3-5 EPU CPU cycles200% in 2 EPUs30%> 6 SIU CPU cycles100% in 1 SIU25%4 EPU memory128 MB16-32 MB4-8 SIU memory128 MB< 16 MB8 Bandwidth – instrument to EPU20 MB/sec5 MB/sec4 Bandwidth – EPU or SIU to SSR5 MB/sec40 kB/sec112 Bandwidth – CPU to CPU2.5 MB/sec20 kB/sec125

9 GLAST LAT ProjectCDR/CD3 Review May 12-16, 2003 Document: LAT-PR-01967Section XX 9 Key Science Performance Metrics

10 GLAST LAT ProjectCDR/CD3 Review May 12-16, 2003 Document: LAT-PR-01967Section XX 10 Configuration Management LAT CM Defined By LAT MD-00068-01 Major Supplier CM defined internally Key Subsystem Doc CM Transferred to LAT CM upon Subsystem Delivery to LAT

11 GLAST LAT ProjectCDR/CD3 Review May 12-16, 2003 Document: LAT-PR-01967Section XX 11 Management Plans

12 GLAST LAT ProjectCDR/CD3 Review May 12-16, 2003 Document: LAT-PR-01967Section XX 12 Change Control Process

13 GLAST LAT ProjectCDR/CD3 Review May 12-16, 2003 Document: LAT-PR-01967Section XX 13 Change Control Thresholds

14 GLAST LAT ProjectCDR/CD3 Review May 12-16, 2003 Document: LAT-PR-01967Section XX 14 Risk Management LAT Risk Management Defined By LAT-MD-00067-03 Parallel Process To GSFC …. Continuous Process Across LAT Risk Ranked By Probability and Impact to Technical, Cost & Schedule Low Risk (Selected Mitigation) Moderate Risk (Selected Mitigation) High Risk (Mitigation Required) Risk Ranking Impact

15 GLAST LAT ProjectCDR/CD3 Review May 12-16, 2003 Document: LAT-PR-01967Section XX 15 Top Risks ID #Risk Rank Risk DescriptionRisk MitigationMitigation Status Moderate On track Moderate On track

16 GLAST LAT ProjectCDR/CD3 Review May 12-16, 2003 Document: LAT-PR-01967Section XX 16 System Requirements, Traceability & Interfaces

17 GLAST LAT ProjectCDR/CD3 Review May 12-16, 2003 Document: LAT-PR-01967Section XX 17 Specification Tree

18 GLAST LAT ProjectCDR/CD3 Review May 12-16, 2003 Document: LAT-PR-01967Section XX 18 Requirements Development Level 2 Reqts Peer Reviews (Aug. 2000) Level 2 Reqts placed under LAT CM LAT System Requirements Review (Sep. 2000) Level 3 Reqts Peer Reviews (Mar.-Apr. 2001) Level 3 Reqts placed under LAT CM Level 4 Reqts developed by subsystems Preliminary Design Reviews (Jan. & Jul. 2002) Level 4 Reqts placed under subsystem CM Line-by-line reviews of LAT and IOC Performance Specs by Subsystem Mgrs, Engineering and Science Leads Updates require approval of LAT change control board Top-level subsystem performance requirements were reviewed by Subsystem Mgrs and LAT Engineering and Science Leads Updates require approval of LAT change control board Subsystem design specifications are controlled at the subsystem level. Level 4 requirements are managed and tracked at subsystem level. CCB changes, document updates and test planning Critical Design Review (May 12-16, 2003) Reqts. docs imported and linked in DOORS Reqts. in DOORS linked to planned tests and analyses. Impacts from changes are flowed up or down as they are identified.

19 GLAST LAT ProjectCDR/CD3 Review May 12-16, 2003 Document: LAT-PR-01967Section XX 19 Requirements Traceability and Verification Example of Flowdown from Science Requirements

20 GLAST LAT ProjectCDR/CD3 Review May 12-16, 2003 Document: LAT-PR-01967Section XX 20 Requirements Traceability and Verification Effective Area Requirement Flowdown

21 GLAST LAT ProjectCDR/CD3 Review May 12-16, 2003 Document: LAT-PR-01967Section XX 21 Requirements Traceability and Verification Effective Area Requirement Flowdown

22 GLAST LAT ProjectCDR/CD3 Review May 12-16, 2003 Document: LAT-PR-01967Section XX 22 Requirements Traceability and Verification Effective Area Requirement Flowdown

23 GLAST LAT ProjectCDR/CD3 Review May 12-16, 2003 Document: LAT-PR-01967Section XX 23 Requirements Traceability and Verification Example of Flowdown from Mission System Specification

24 GLAST LAT ProjectCDR/CD3 Review May 12-16, 2003 Document: LAT-PR-01967Section XX 24 Requirements Traceability and Verification Example of Flowdown from Interface Requirements Document Verification of this requirement includes hardware and software components.

25 GLAST LAT ProjectCDR/CD3 Review May 12-16, 2003 Document: LAT-PR-01967Section XX 25 Requirements Traceability and Verification Future Work –Near term Incorporate all CCB-approved Level 2 and 3 changes in requirements document revisions (ECD 6/13/2003) Bring DOORS database up-to-date with recently released test plans (ECD 6/30/2003) Release reports for all requirements verified by analysis (ECD 7/31/2003) –Long term Prepare requirements verification table for level 2 and 3 requirements –Link requirements to test procedures (ECD June 2004) –Link requirements to test data packages (On- going as tests are completed. ECD June 2005)

26 GLAST LAT ProjectCDR/CD3 Review May 12-16, 2003 Document: LAT-PR-01967Section XX 26 Interface Development

27 GLAST LAT ProjectCDR/CD3 Review May 12-16, 2003 Document: LAT-PR-01967Section XX 27 Structural/Thermal Interface Overview

28 GLAST LAT ProjectCDR/CD3 Review May 12-16, 2003 Document: LAT-PR-01967Section XX 28 Electrical Interface Overview

29 GLAST LAT ProjectCDR/CD3 Review May 12-16, 2003 Document: LAT-PR-01967Section XX 29 Interface Documentation Status

30 GLAST LAT ProjectCDR/CD3 Review May 12-16, 2003 Document: LAT-PR-01967Section XX 30 LAT Internal Interfaces

31 GLAST LAT ProjectCDR/CD3 Review May 12-16, 2003 Document: LAT-PR-01967Section XX 31 LAT External Interfaces

32 GLAST LAT ProjectCDR/CD3 Review May 12-16, 2003 Document: LAT-PR-01967Section XX 32 Key Open Interface Issues

33 GLAST LAT ProjectCDR/CD3 Review May 12-16, 2003 Document: LAT-PR-01967Section XX 33 Summary Weekly Telecons and Frequent Splinter Meetings have resulted in: –LAT-SC ICD released –TKR, CAL and ACD ICD’s released and contain 0 TBX’s –Electronics-LAT Mechanical/Thermal ICD near completion and soon to be released –All Interface Definition Drawings released –Key open interface issues to be resolved by June 2003

34 GLAST LAT ProjectCDR/CD3 Review May 12-16, 2003 Document: LAT-PR-01967Section XX 34 GLAST Large Area Telescope: LAT FMEA/PRA/Reliability Tim Thurston SLAC thurston@slac.stanford.edu Gamma-ray Large Area Space Telescope

35 GLAST LAT ProjectCDR/CD3 Review May 12-16, 2003 Document: LAT-PR-01967Section XX 35 System FMEA/PRA/Reliability

36 GLAST LAT ProjectCDR/CD3 Review May 12-16, 2003 Document: LAT-PR-01967Section XX 36 GLAST Large Area Telescope: System Engineering Subsystem WBS: 4.1.2 Tom Leisgang LAT Systems Engineering Test & Verification toml@slac.stanford.edu Gamma-ray Large Area Space Telescope

37 GLAST LAT ProjectCDR/CD3 Review May 12-16, 2003 Document: LAT-PR-01967Section XX 37 Requirements Verification Process A tested and certified instrument

38 GLAST LAT ProjectCDR/CD3 Review May 12-16, 2003 Document: LAT-PR-01967Section XX 38 LAT Test Plan Organization

39 GLAST LAT ProjectCDR/CD3 Review May 12-16, 2003 Document: LAT-PR-01967Section XX 39 LAT Performance Verification

40 GLAST LAT ProjectCDR/CD3 Review May 12-16, 2003 Document: LAT-PR-01967Section XX 40 LAT Science Verification

41 GLAST LAT ProjectCDR/CD3 Review May 12-16, 2003 Document: LAT-PR-01967Section XX 41 Subsystem Qualification Programs

42 GLAST LAT ProjectCDR/CD3 Review May 12-16, 2003 Document: LAT-PR-01967Section XX 42 Subsystem Acceptance Test Program

43 GLAST LAT ProjectCDR/CD3 Review May 12-16, 2003 Document: LAT-PR-01967Section XX 43 Performance Verification :Thermal

44 GLAST LAT ProjectCDR/CD3 Review May 12-16, 2003 Document: LAT-PR-01967Section XX 44 Performance Verification: Dynamics

45 GLAST LAT ProjectCDR/CD3 Review May 12-16, 2003 Document: LAT-PR-01967Section XX 45 Performance Verification: Electronics

46 GLAST LAT ProjectCDR/CD3 Review May 12-16, 2003 Document: LAT-PR-01967Section XX 46 LAT Verification Summary All LAT subsystems and LAT Instrument have complete requirements verification All MAR test requirements are performed and verified All Science Requirements are verified Systems Engineering has a “closed loop” requirements verification process in place

47 GLAST LAT ProjectCDR/CD3 Review May 12-16, 2003 Document: LAT-PR-01967Section XX 47 Systems Engineering DRAFT Cost/Schedule Summary

48 GLAST LAT ProjectCDR/CD3 Review May 12-16, 2003 Document: LAT-PR-01967Section XX 48 CCB Actions Affecting 4.1.2 Change Request #DescriptionStatus LAT-XR-01395-01Systems Engineering Manpower Approved $2.2M

49 GLAST LAT ProjectCDR/CD3 Review May 12-16, 2003 Document: LAT-PR-01967Section XX 49 Budget, Cost, Performance

50 GLAST LAT ProjectCDR/CD3 Review May 12-16, 2003 Document: LAT-PR-01967Section XX 50 Cost/Schedule Status ItemIn k$ Budget at Complete4,647 Budgeted Cost for Work Scheduled (a)2,583 Budgeted Cost for Work Performed (b)2,577 Actual Cost for Work Performed2,880 Cost Variance-302-11.7% of (b) Schedule Variance-6-.2% of (a) Status as of February 28, 2003:

51 GLAST LAT ProjectCDR/CD3 Review May 12-16, 2003 Document: LAT-PR-01967Section XX 51 Manpower Plan

52 GLAST LAT ProjectCDR/CD3 Review May 12-16, 2003 Document: LAT-PR-01967Section XX 52 Procurements Long-Lead Procurements Major Upcoming Procurements Near-Term (< 4 months) –Orbital Network Engineering –Stellar Solutions Major Upcoming Procurements Long-Term (>4 months) Minor Upcoming Procurements

53 GLAST LAT ProjectCDR/CD3 Review May 12-16, 2003 Document: LAT-PR-01967Section XX 53 Summary To be provided

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