Lunar Atmosphere and Dust Environment Explorer (LADEE) is a NASA mission that will orbit the Moon and its main objective is to characterize the atmosphere and lunar dust environment. Lunar Atmosphere and Dust Environment Explorer (LADEE) is a NASA mission that will orbit the Moon and its main objective is to characterize the atmosphere and lunar dust environment. - Low cost, minimal complexity and rapidly prototyped “common bus” design.
- Model-Based Software Development
Phasing Loops - 3 Perigee Manuevers
- Time, Opportunity for Adjustments
- Similar to past missions
- (Clemintine, Wind WMAP)
Lunar Orbit Insertion
3U Compact PCI – Broad Reach 3U Compact PCI – Broad Reach Active Memory BAE Rad750 128Mb Broad Reach DMOAB SDRAM Storage - 1GB SECDED (32 Bit)
- 4 FAT16 Partitions* (*Primary)
Other C&DH Memory - SRAM – Devices
- EEPROM & Flash – Program Storage
Requirement Summary: Requirement Summary: - Provide ability to enable/disable scrubbing
- Provide corrected/uncorrected memory error counters and last error address
- Enable/Disable EDAC interrupts
- Provide corrected, uncorrected, and critical error events
- Overwrite uncorrected memory error locations to prevent continuous reporting
Flight Software built on CFE - Separate Tasks
- Message Based
Memory Scrub Task - VxWorks Driver
- Handles Interrupts
- Silences Correctable and “Uncorrectable”
- MS Task
- Configures Drivers
- Records and Logs Events
Periapsis #1 Detail
Periapsis #2 Detail
Periapsis #3 Detail
Normal Activity Normal Activity - Average about 1 to 2 a Day
- Some Groups of Events
- Patterns or Locations
“Uncorrectable” Errors
Events can happen fast in Groups Events can happen fast in Groups - (May loose events due to rapid frequency)
Van Allen Belt effects higher than expected Events happen anywhere Unusual Events
Mapping Locations by usage Mapping Locations by usage Improved logging of Events Better ways of injecting events during testing
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