In-flight calibration, alignment and verification of an astroinertial attitude determination system for free-flying robots and land-survey satellites

We consider some principal problems on precise attitude determination of the free-flying robots and maneuvering land-survey mini-satellites operated on the orbit altitudes from 550 up to 1000 km. We present onboard discrete algorithms for signal processing, calibration, alignment and verification of an astroinertial attitude determination system which is a part of the strapdown inertial navigation system.