GLAST LAT Project
LAT Planning Meeting July 17th and 18th
GLAST Large Area Telescope:
Gamma-ray Large
Area Space
Telescope
I & T Input to LAT Planning Meeting
July 17th and 18th
Elliott Bloom
SU-SLAC
Subsystem Manager
Brian Grist
SU-SLAC
Subsystem Engineer
elliott@slac.stanford.edu, bgrist@slac.stanford.edu
650-926-2469
650-926-2998
4.1.9 - Integration and Test
1
GLAST LAT Project
LAT Planning Meeting July 17th and 18th
Key Milestone List to Delivery
(Not Necessarily in Current PMCS)
EM Plan, Procedures, EGSE and MGSE Complete
07/31/03
Receive CAL EM
08/08/03
Receive TKR mini-tower
08/22/03
EM Tower functional tests Complete
09/18/03
EM Tower Available for use by Flight Software
09/18/03
EM Calibration Complete
10/12/03
EM mechanical fit check using 1X4 Grid, TKR Mech tower, CAL
10/13/03
CAL EM at NRL Loading Doc; TKR mini-tower in Italian Customs 10/17/03
Support GSI Beam Test (CAL and TKR mini-tower)
11/14/03
All I&T Flight Techs on Staff (Mechanical and Electrical)
12/15/03
Flight Integration Training MGSE Ready
01/15/04
All Flight Integration Procedures Complete
02/15/04
All Flight Integration MGSE Complete with SDP
03/01/04
LAT Assembly Configuration EGSE Ready For Use
03/01/04
Integration Readiness Review
03/15/04
TKR A/B Available RFI
04/15/04
Grid Available RFI
05/20/04
CAL A/B Available RFI
05/20/04
4.1.9 - Integration and Test
2
LAT Planning Meeting July 17th and 18th
GLAST LAT Project
Multi-Tower EGSE (9/15/03)
EGSE Crate
ACD
or
Sensor
Simulator
CPU
GASU
WAN
LCB
28 V Supply
VME
AEM
Central
Database
EBM
TEMs
Firewall
GEM
Online
Workstation
CAL, TKR
or
Sensor
Simulator
T&DF System (LAT)
4.1.9 - Integration and Test
SLAC
EGSE
3
LAT Planning Meeting July 17th and 18th
GLAST LAT Project
Single Tower EGSE Configuration (GSI test)
Online
Workstation
Subsystem
(or simulator)
CPU
• Commanding
• Telemetry
• Monitoring
AEM/TEM
• Hardware Drivers
LAT-COMM
•External Trigger
DC Power
• Test Exec
• Configuration
• Commanding
• Telemetry
• Event Processing
• Monitoring
• Visualization
• Data base
• Message logger
• Alerts
• Electronic log
Main Dataflow
Ethernet
Central
Database
WAN
Back door
debug RS-232
Ethernet
Ethernet Router
and Firewall
VME Chassis
External Hardware
Subsystem/simulator
Electronics/Online
4.1.9 - Integration and Test
4
LAT Planning Meeting July 17th and 18th
GLAST LAT Project
Key Milestone List to Delivery After Start of Flight I&T
(Not in Current PMCS)
Start Tower A/B Installation/Test
Start Tower 1/2 Installation/Test
Start Tower 13/14 Installation/Test
Finish Tower Installation/Test
Finish Installation of ACD/ELEX/X-LAT
Flight Configuration Ready for System Test
Complete System Test
LAT Shipped for Environmental Testing
Environmental Testing Complete
LAT RFI
4.1.9 - Integration and Test
05/20/04
07/01/04
10/28/04
11/11/04
12/23/04
12/23/04
04/21/05
07/21/05
11/03/05
12/01/05
5
LAT Planning Meeting July 17th and 18th
GLAST LAT Project
ACD
or
Sensor
Simulator
GASU
SIU
Spacecraft
simulator
CPU
Discretes
1553
1553
LCB
28 V Supply
Central
Database
SSR
AEM
EBM
GEM
3 EPUs
TEMs
Test Point on
LAT EMI Skirt
LAT
Firewall
CPU
LCB
CAL, TKR
or
Sensor
Simulator
WAN
LAT Assembly Configuration (3/1/04)
Online
Workstation
EGSE Crate
CPU
LCB
SLAC
EGSE
4.1.9 - Integration and Test
6
LAT Planning Meeting July 17th and 18th
GLAST LAT Project
ACD
GASU
SIU
Spacecraft
simulator
CPU
Discretes
1553
1553
LCB
28 V Supply
AEM
WAN
Complete Flight Unit Configuration & CU (12/24/04)
Central
Database
SSR
EBM
GEM
3 EPUs
LCB
TEMs
Test Point on
LAT EMI Skirt
CAL, TKR
Firewall
CPU
Online
Workstation
EGSE Crate
CPU
LCB
LAT
SLAC
EGSE
4.1.9 - Integration and Test
7
GLAST LAT Project
LAT Planning Meeting July 17th and 18th
Interdependencies
• Dependent on deliveries from all subsystems to be able to do the
core of our work.
– EM CAL & TKR mini-tower deliveries.
– EM GASU and flight software support from ELX.
– All Flight Hardware and Software.
– MGSE FEM Analysis
• Budget for I&T Flight Electronic Techs and the hiring of those
techs (4 full time people starting 12/15/03) is currently the
responsibility of ELX. I&T will schedule the work for these Techs.
• System engineering test plans are required as input to I&T test
plans and resulting procedures.
• Mission level EGSE decisions can impact I&T EGSE schedule and
budget.
4.1.9 - Integration and Test
8
GLAST LAT Project
LAT Planning Meeting July 17th and 18th
Flight Hardware Procurements
• No flight hardware procured by I&T. All flight components
come from a subsystem.
4.1.9 - Integration and Test
9
GLAST LAT Project
LAT Planning Meeting July 17th and 18th
Flight Hardware Manufacturing Plan Status
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
LAT-MD-01376
LAT-MD-01137
LAT-MD-01533
LAT-MD-00446
LAT-MD-01587
LAT-MD-01598
LAT-MD-01462
LAT-MD-01836
LAT-MD-01837
LAT-MD-01838
LAT-MD-00676
LAT-MD-01386
LAT-MD-01586
LAT-MD-01055
LAT-MD-00440
LAT Integration & Test Plan
In Work
LAT EM Test Plan
In signoff
EGSE Plan
In revision
SVAC Plan
Released
SVAC Test Plan
Released
LAT Weight and CG Test Plan
Released
MGSE Development Plan
In signoff
LAT Dynamics Test Performance Plan
Draft in Cyberdocs
LAT Thermal Test Performance Plan
Draft in Cyberdocs
LAT EMI Test Performance Plan Draft in Cyberdocs
LAT Assembly Sequence
In revision
LAT Facilities Plan
Released
LAT Survey & Alignment Performance Plan
In signoff
LAT Electrical Test Performance plan
Released
LAT Particle Test Plan
In signoff
4.1.9 - Integration and Test
10
GLAST LAT Project
LAT Planning Meeting July 17th and 18th
Engineering Model Testing Closure Status
• I&T Tests of the TKR mini-tower were done and the results
reported to the Engineering meeting at June 10 Engineering
Meeting. Data is still being worked.
• EM tower (CAL EM and TKR mini-tower) due in August to I&T
• Complete EM Tower functional test by September 18th and then
make available to Flight Software.
• Complete EM Calibration by October 12th.
• Need 1x4 Grid and TRK EM Mechanical tower a week before
Mechanical fit check to assemble TRK EM into grid.
• Perform a mechanical fit check using 1x4 Grid, TKR
Mechanical Tower, and EM CAL on October 13th.
• CAL EM on the NRL loading dock and the TKR mini-tower in
Italian Customs by October 17th.
• Support the GSI Beam Test, including the CAL and the TKR
mini-tower (run Carbon in the daytime) November 14th – 24th.
4.1.9 - Integration and Test
11
GLAST LAT Project
LAT Planning Meeting July 17th and 18th
Open Flight Design Issues/ Status Trades
• CAL-Grid interface design, impacts I&T MGSE, assembly,
processes, and procedures. Design not completed.
• Grid EMI Skirt design impacts I&T assembly, processes and
procedures. Design not completed.
• X-LAT plate design impacts I&T MGSE, assembly, processes
and procedures. Design not completed.
• Radiator interface and MGSE design impact I&T, assembly,
processes and procedures. Design not completed.
• Environmental test sensor requirements impact I&T assembly,
processes and procedures. Requirements have not been
finalized.
• LAT pointing knowledge requirements are under review by the
project. I&T test plans cannot be finalized until we know the
final requirements.
4.1.9 - Integration and Test
12
LAT Planning Meeting July 17th and 18th
GLAST LAT Project
Cost/Schedule Status (May Month End)
-2% variance
-5% variance
Cost Variance – GREEN
Schedule Variance – YELLOW
Beam test change
request has been
approved and has
been incorporated
for the June Report.
The monthly Cost and Schedule Variances are trending
negative
4.1.9 - Integration and Test
13
GLAST LAT Project
LAT Planning Meeting July 17th and 18th
Issues/Concerns/Suggestions/Risks
•
Late delivery to I&T of EM parts and EGSE software test scripts.
 Late delivery has delayed preparations for LAT, particularly in areas of IFCT and
SVAC. Possible impact on EGSE.
 Part of EGSE/MGSE verification strategy depends on I&T EM program.
•
•
•
•
•
•
•
Finalization of all LAT test plan requirements is not complete post CDR. This
is resulting in compressed schedule and potential increased cost for I&T.
Current estimates are September for completing all test plans from the Design
Team.
Delivery of flight hardware to I&T may be late.
I&T EGSE is proceeding with in-house developed test executive software.
Change to another system for Observatory and/or IOC will require major cost
change request.
Spacecraft interface detail uncertainty.
 Environmental test fixtures.
 EGSE interface.
 MGSE handling fixtures.
SIIS fidelity uncertainty.
Delivery of flight hardware to I&T may be late.
When will a decision be made about where to go for Environmental Testing?
This will impact preparations and design of Vib and T/V fixtures.
4.1.9 - Integration and Test
14