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针对高动态条件下星图拖尾导致惯性星光组合定姿精度下降甚至无法定姿的问题,提出了一种基于乘性扩展卡尔曼滤波的惯性星光深度组合姿态确定方法.利用星敏感器观测信息修正姿态误差,补偿陀螺漂移,并建立了陀螺输出的角度变化量与星图像移的关系,利用陀螺输出信息估计星图拖尾的模糊参数,采用维纳滤波复原方法对产生拖尾的星图进行复原以提高星图信噪比和观测精度.仿真结果表明该方法可以有效提高星像质心提取精度和星图识别率,对初始姿态误差修正更快,且不存在星图误匹配的情况,保证了惯性星光组合定姿方法在高动态条件下仍能保持较高的精度.
In order to solve the problem that inertial starlight combined attitude determination is notorized or not even under the condition of high dynamic dynamics, a new attitude determination method based on multiplicative extended Kalman filter is proposed, The attitude error is corrected and the gyro drifts are compensated. The relationship between the angular variation of the gyro output and the star image shift is established. The gyro output information is used to estimate the blur parameters of the star image trailing tail. The Wiener filter restoration method is used to generate the tail image Which can improve signal-to-noise ratio and observation accuracy of the star graph.The simulation results show that the proposed method can effectively improve the extraction accuracy of the star image centroid and the recognition rate of the star image, and can correct the initial attitude error faster without error matching of the star image, It is ensured that the inertial starlight combined attitude determination method can still maintain high precision under high dynamic conditions.