Transcript esponse

GLAST LAT Project
RFA 11- LAT Modes (1/3)
• Specific Request
– The LAT Operations Team and Spectrum Astro should work
together to verify if any interactions between LAT modes
and spacecraft modes need to occur. For example, if a LAT
mode change requires the spacecraft to change spacecraft
mode and/or configuration.
• Response
– Identified and confirmed LAT modes with FSW
– Except for autonomous repoint requests, LAT mode
changes do not drive spacecraft changes
8/2/2004 – Lori Bator
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GLAST LAT Project
RFA 11- LAT Modes (2/3)
Mission Modes
SC Mode
Launch
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S-Band rcvr/xmit
On battery power
Early Orbit
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Inertial capture
S-Band rcvr/xmit
Sun point with solar arrays tracking
Engineering
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Inertial point, zenith point, or maneuver
Ku-Band xmit, S-Band rcvr/xmit
Solar arrays tracking
Sky Survey
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Zenith point
Ku-Band xmit, S-Band rcvr/xmit
Solar arrays tracking
Pointed and Repointed
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Inertial point, maneuver
Ku-Band xmit, S-Band rcvr/xmit
Solar arrays tracking
Safe mode
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Inertial capture, sun point
S-Band rcvr/xmit
Solar arrays fixed
Re-Entry
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Cruise, delta-V
S-Band rcvr/xmit
Solar arrays tracking
8/2/2004 – Lori Bator
LAT Mode
Off
Survival
Science
Calibration
Diagnostic
SAA
LAT Safe
Survival
Off
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GLAST LAT Project
RFA 11- LAT Modes (3/3)
• Survival
– LAT powered off
– Survival heaters provide thermal control
• Science Mode
– Physics (data taking) modes
• Calibration
– Charge injection calibration
• Diagnostic
– Engineering and troubleshooting
• SAA
– South Atlantic Anomaly (SAA) Safe Mode
• LAT Safe
– SIU, PDU, GASU, and thermal control on
8/2/2004 – Lori Bator
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