SI-21 - Information Refresh

Refresh [Assignment: organization-defined information] at [Assignment: organization-defined frequencies] or generate the information on demand and delete the information when no longer needed.


ID: SI-21
Enhancements: 

Space Segment Guidance

The vehicle should spot incorrect responses from external services before trusting them. For example, a commercial GNSS feed might be spoofed to shift orbit calculations. Implement a sanity checker that cross-verifies navigation fixes against orbital mechanics and star tracker vectors. If error exceeds a mission-set threshold, quarantine the data, switch to inertial propagation, and alert operators. Similar cross-checks apply to uplink key updates or third-party ephemeris, blocking poisoned inputs from cascading through guidance and control.