Reference Cross-Calibration
Periodic Cross-Calibration of Star/Sun/Earth References
Periodic cross-calibration of star, sun, and Earth references is an autonomous navigation software routine that compares multi-sensor pose estimates to detect measurement drift and bias. Executed from radiation-hardened NOR flash at a power draw of 0.5 watts, the software runs consistency checks every hour using Allan-style time-series analysis. Across a 100-year operational lifetime on the lunar surface, optical hardware suffers radiation-induced aging, requiring continuous cross-comparison to characterize progressive hardware degradation. When reference disagreement among the star tracker, sun sensor, and Earth sensor exceeds designated thresholds, the software automatically flags the anomaly across a 500,000-hour mean time between failures.
Software that periodically cross-calibrates star tracker, sun sensor, and Earth sensor against each other to detect drift and bias.
Purpose
Software that periodically cross-calibrates star tracker, sun sensor, and Earth sensor against each other to detect drift and bias.
Context
Child of L2-NAV-REF within the Lunar Ark system
Principles
- ▸Consistency check across multi-sensor pose estimates
- ▸Drift detection via Allan-style time-series analysis
- ▸Automatic flagging if reference disagreement exceeds threshold
- ▸Long-mission calibration history
- ▸Authenticated commands for re-cal triggering
Typical implementations
- ▸Spacecraft AOCS heritage cross-cal
- ▸Multi-sensor fusion in autonomous vehicles
- ▸ESA AOCS calibration philosophy
Lunar considerations
- ▸Long-mission sensor aging characterized via cross-cal
- ▸ML-augmented anomaly detection
- ▸History to L1-DVT
Specifications
Functional
| primary function | Software that periodically cross-calibrates star tracker, sun sensor, and Earth sensor against each other to detect drift and bias. |
| check interval hr | 1 |
Physical
| mass kg | 0 |
| materials | Code on rad-hard NOR flash |
| vacuum compatibility | True |
Operational
| power consumption w | 0.5 |
| thermal range c | -40, 70 |
| lifetime years | 100 |
| mtbf hours | 500000 |
Interfaces
Provides
- Reference health summary
- Aid for IMU recal
Requires
- Reference pose inputs
Cite this entry
Lunar Ark Codex. "Reference Cross-Calibration" (L3-NAV-REF-CAL). Retrieved 10 September 2026, from https://lunarark.com/entry/L3-NAV-REF-CAL
Licensed CC-BY-SA 4.0. You may reuse and adapt this entry with attribution, under the same licence.