Transcript Mike-I T.ppt

CRaTER Pre-Environmental Review
(I-PER)
Spacecraft I&T
Mike Golightly
September 10-11, 2008
Cosmic RAy Telescope for the Effects of Radiation
I&T Support
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CRaTER team will retain the expertise necessary to address any issues that arise during
I&T, launch, and initial operations:
– Digital electronics, spacecraft interfaces, instrument simulator, embedded software: MIT/B.
Goeke, D. Gordon
– Analog electronics: Aerospace Corp/B. Crain
– MOC-CRaTER SOC interface: MIT/P. Ford, BU/E. Wilson, BU/D. Bradford
– Assembly Q&A, safety: MIT/B. Klatt
Cosmic RAy Telescope for the Effects of Radiation
I&T Support
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Support during I&T activities at Goddard and KSC
– Send the minimal number of team members as possible
– System experts remain on-call at home institutions to trouble-shoot problems
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Basis for I&T support strategy
– Instrument and its operation are extremely simple and straightforward
– Anticipate subset of instrument data available in real-time via TCP/IP
• Secondary Science & Housekeeping data
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verified to work between GSFC and MIT/B. Goeke
– Primary Science data will only be available as files after downloading from spacecraft at
conclusion of test
• files can be emailed (or uploaded) to CRaTER support team for immediate analysis
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unverified
Cosmic RAy Telescope for the Effects of Radiation
I&T Support
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Basis for I&T support strategy (cont)
– No mechanical systems; no capability to access instrument’s internal components without
compromising unit’s integrity
– Difficult to assess loss of detectors or changes to instrument’s gain/resolution without
exposing instrument to a radiation source (not feasible during most I&T activities)
– GSFC/R. Sanidad trained on instrument operations
– Engineering Model located at MIT
• can be used to replicate and/or diagnose instrument responses/functionality observed during I&T
Cosmic RAy Telescope for the Effects of Radiation
Simulators for I&T Support
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Electrical simulator
– Delivered to GSFC (Jun 2006)
– Verified R/T data flow from Goddard to MIT for housekeeping and secondary science
packets
– First instrument electrical simulator check at Goddard in December 2006—no problems
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Mass simulator
– Delivered to GSFC (Jan 2007)
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CRaTER Engineering Model (EM)
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EM unit located at Boston University CRaTER Lab
Unit hardware/software essentially identical to flight unit
1553↔TCP/IP
Unit can be used to replicate commands ands instrument functionality
Cosmic RAy Telescope for the Effects of Radiation
I&T Tests Completed
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Thermal blanket fit check (in work)
– thermal blanket template received from GSFC (Jul 2007)
• template used to locate posts for blanket attach
Cosmic RAy Telescope for the Effects of Radiation