Abstract:

A real-time on-orbit attitudeindependent calibration algorithm for sunsensor/magnetometer is proposed. In the existing calibration algorithm, only the norm of the geomagnetic field is used as the measurement. In this paper the dot production between the magnetic vector and the sun vector is introduced as another measurement, so that the system observability is reinforced, and it also enables the real-time calibration of the sun-sensor. Although extended Kalman filter (EKF) is widely used, its linearization process introduces some errors into the system.

Key words: calibration,  , attitude , determination,  , Kalman , filter,  , micro-satellite,  , unscented , transform