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为了消除大气内观星时蒙的影响,提高载体定姿精度,提出了一种蒙气差补偿算法。首先给出了补偿过程涉及的姿态转移矩阵,并完成了相关矢量坐标映射变换;接着在星敏感器坐标系内,用两矢量内积法求得视天顶距;最后利用几何公式列出了以真星光矢量投影点估计位置为未知量的方程组,作为星敏感器任意姿态下蒙气差补偿算法模型。在没有任何误差的条件下对模型有效性进行了仿真,10-6 pixel量级的位置估计精度表明了算法的有效性。加入不同量级的陀螺漂移误差进行了仿真,给定的漂移误差对于蒙气差补偿模型的估计精度影响甚微,仿真结果表明在捷联载体存在一定姿态误差的前提下,蒙气差补偿模型也是适用的,补偿后的星像坐标用以实现星光姿态确定,并进一步对陀螺漂移完成补偿。
In order to eliminate the impact of stargazing in the atmosphere and improve the attitude accuracy of the carrier, a compensation algorithm of the mask offset is proposed. Firstly, the attitude transfer matrix involved in the compensation process is given, and the related vector coordinate mapping transformation is completed. Then the apparent zenith distance is obtained by the two-vector inner product method in the star sensor coordinate system. Finally, The system of equations for estimating the position of unknown stars by the projection points of the real star light vector is used as the model of the compensation algorithm for the monsoon gas under arbitrary attitude of the star sensor. The validity of the model was simulated without any error. The accuracy of position estimation on the order of 10-6 pixel shows the effectiveness of the algorithm. The simulation results show that under the precondition that there is a certain attitude error in the strapdown carrier, the compensation of the Mongolia differential air temperature difference Is also applicable, the compensation of the star image coordinates to achieve the star attitude determination, and further completion of the gyro drift compensation.