空间相机像移补偿计算中飞行器大姿态角使用方法

Aircraft′s large attitude angles′ usage in image motion compensation calculation of space camera

提出了在大姿态角情况下飞行器姿态参数的使用方法以实现像移速度的精确计算。根据飞行器轨道坐标系转换到飞行器坐标系的转换矩阵,推导了在大姿态角存在时轨道坐标系下的姿态角速度与飞行器坐标系下的姿态角和姿态角速度的关系式。通过计算得出,在侧摆角为30°时对飞行器坐标系绕飞行器轨道坐标系的转动角速度ωS1、ωS2和ωS3的影响最大误差分别为1.175%、50%和13.223%;在前后摆角为30°时对ωS1、ωS2和ωS3的影响最大误差分别为63.397%、0.1745%和63.397%。根据空间相机像移速度计算精度要求比较高,确定了在一定的姿态角情况下飞行器姿态参数使用方法。提出的方法简单,易于实现,适用于空间相机像移补偿的研究。

In order to achieve image motion velocity accurate calculation, the method was put forward when using aerocraft attitude parameters in big attitude angle. According to the transition matrix that was from orbit coordinate to aerocraft coordinate, the relationship between coordinate system attitude angular in orbit and attitude angle, attitude angular velocity in vehicle coordinate system was derived in the big attitude angle. By calculation, when the scroll angle was 30＆#176;, the maximum relative error of ωS1, ωS2 andωS3 that were caused by scroll angle were 1.175%, 50% and 13.223%; when the pitch angle was 30＆#176;, the maximum relative error of ωS1, ωS2 and ωS3 that were caused by pitch angle were 63.397%, 0.1745% and 63.397%.According to the high calculation precision of space camera image motion velocity, in a certain attitude angle, the method of using aerocraft attitude parameters was identified. This proposed method is simple and easy to implement, which is suitable for the research of image motion compensation of space camera.