Autonomous Navigation Algorithm During Continuous Low Thrust Orbit Control Based on EKF and PI Fiter
The autonomous navigation algorithm during continuous low-thrust orbit control for high-orbit satellites with electric thruster is researched.In view of the relatively poor speed measurement precision of GNSS receivers in high orbit,and the small acceleration generated by electric thruster during orbit control can not be measured accurately by conventional accelerometers,which leads to the decline of autonomous navigation accuracy during orbit control,an integrated autonomous navigation algorithm based on EKF+PI filter is proposed.Firstly,the EKF filter is designed to suppress the high frequency noise of positioning data generated by the GNSS receiver.Then,the acceleration generated by the electric thruster is estimated by PI filter and fed back to the EKF algorithm.By combing the EKF filter with PI filter,the precision of the navigation algorithm is improved during the electric thruster's working.Lastly,the mathematical simu-lation is implemented,and the result shows that the integrated autonomous navigation algorithm based on EKF+PI filter can accurately estimate the acceleration magnitude generated by electric thruster.Mean-time,the integrated algorithm proposed can effectively improve the precision of autonomous navigation dur-ing continuous low-thrust orbit control.
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