基于地标信息的星敏感器低频误差标定方法

针对星敏感器及其安装结构热变形等因素引起的星敏感器低频误差(LFE)影响卫星姿态确定精度的问题,提出了根据有效载荷提供的地标信息,采用最小二乘算法标定星敏感器低频误差的方法.考虑到卫星姿态确定系统是为有效载荷服务的,为了使卫星姿态确定系统输出的姿态信息与有效载荷相一致,从而准确反映有效载荷的指向变化情况,星敏感器低频误差的标定以有效载荷提供的地标信息为观测量进行.仿真结果表明,所提方法能够有效减弱星敏感器低频误差对卫星姿态确定精度的影响,从而提高卫星姿态确定精度.

Calibration of Star Sensor's Low Frequency Error Based on Landmark Information

The star sensor＇s low frequency error（LFE） caused by the thermal distortion of the star sensor and its bracket may affect the satellite attitude determination accuracy.In order to cope with this problem,a low frequency error calibration method for star sensor based on the landmark information obtained from the payload is proposed by using the least square（LS） algorithm in this paper.Considering that the satellite attitude determination system serves for the payload,the purpose of the paper is to make the attitude information from the satellite attitude determination system consistent with that from the payload,such that the boresight of the payload can be determined accurately.Thus,the landmark information provided by the payload is adopted as the observation for the calibration for the low frequency error of star sensor.It is illustrated from numerical simulation that the effect of the star sensor＇s low frequency error on attitude determination accuracy is effectively decreased by using the proposed method,and the satellite attitude determination accuracy is improved.