提出了一种基于姿态关联帧的星敏感器标定方法,该方法通过外场天文观测即可实现标定。首先,利用与星敏感器捷联安装的陀螺组合体提供的高精度角度信息,实现了多帧星图的关联叠加,然后构建多帧星图之间恒星与像点的成像映射模型,最后采用最小二乘法实现了星敏感器内参数的全局优化。仿真结果表明,相比基于星角距的标定方法,所提方法标定精度更高、稳健性更佳,且能同时标定出星敏感器相对陀螺组合体的安装矩阵,因此其适用于船载和机载惯性/天文组合导航系统的参数标定。

A star sensor calibration method based on the attitude correlated frame (ACF) is proposed, which can realize the calibration by the astronomical observation outdoors. First, the correlated superposition among the multi-frame star maps is achieved by utilizing the high accuracy angle information provided by the gyro unit which is installed in a strapdown manner with the star sensor. Then, the imaging mapping model between the star and the image point among the multi-frame star maps is established. Finally, the global optimization of the intrinsic parameters for the star sensor is realized by using the least square algorithm. The simulation results show that the proposed method is more precise and robust than the calibration method based on the interstar angles. Moreover, the installation matrix between the star sensor and the gyro unit can be calibrated simultaneously by this method, and thus it is suitable for the parameter calibration of the shipboard, airborne inertial/celestial integrated navigation systems.