Multi-information Fusion Method of Micro Satellite Attitude Determination System

A new micro satellite attitude determination algorithm based on improved fusing-feedback federal filtering was presented in solution of multi-information fusion using micro satellite attitude dynamics,sun sensor,magnetormeter and GPS receiver.Only measurement renovating is processed by local filters,while time renovating and predicted information are done in main filter.The satellite attitude state error equation using quaternion and measurement equation of local filters were showed.Based on magnetometer measurement information the remanence,which is the main disturbing source for microsatellite,was modeled.The simulation results indicate that the accuracy for attitude determination is improved by the attitude dynamics including remanence modeling,while the caculation efficiency is enhanced and the reliability is ensured by the improved federal filtering.