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Determining Spacecraft Motion from Four Star Sensor Measurements

机译：从四颗星传感器测量值确定航天器运动

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The BOKZ-M60 star sensor (a module that measures the coordinates of stars) has been designed for determining the parameters of the orientation of the intrinsic coordinate system relative to the inertial system from observations of stellar sky sections. The methods and results of processing of measurements by a set of four BOKZ-M60 sensors on the Resurs-P satellite no. 2 have been described. The time interval at which the satellite was in orbital orientation exceeds three orbital revolutions (19003 s). The joint processing of measurements by the four sensors conducted at the same time instants allowed the sensors to be associated with the universal coordinate system. With a root-mean-square error of less than 0.4'' for each angle of rotation around its axes, this system is consistent with the model of the satellite's rotational motion. The position of the universal system with respect to the instrumental coordinate system of the satellite was determined from the angular velocity measurements. Here, the root-mean-square errors for the values determined by the angles of rotation of the universal system around its axes were 0.044A degrees, 0.051A degrees, and 0.18A degrees. The low-frequency (with frequencies less than 0.05 Hz) variations in the positions of intrinsic sensor coordinate systems relative to the universal system do not exceed 10''. These are periodic variations with a fundamental frequency equal to the orbital frequency. The root-mean-square values of high-frequency components of these variations do not exceed 18''.
机译：BOKZ-M60恒星传感器（一种测量恒星坐标的模块）已被设计用于根据对恒星天空部分的观测来确定本征坐标系相对于惯性系的定向参数。 Resurs-P号卫星上的一组四个BOKZ-M60传感器处理测量的方法和结果。已经描述了图2。卫星进入轨道的时间间隔超过了三个轨道旋转（19003 s）。由四个传感器同时进行的联合测量处理使这些传感器与通用坐标系相关联。围绕其轴的每个旋转角度的均方根误差均小于0.4英寸，该系统与卫星的旋转运动模型一致。从角速度测量值确定通用系统相对于卫星仪器坐标系的位置。在此，由通用系统绕其轴的旋转角度确定的值的均方根误差为0.044A度，0.051A度和0.18A度。固有传感器坐标系相对于通用系统的位置的低频变化（频率小于0.05 Hz）不超过10英寸。这些是周期性变化，其基本频率等于轨道频率。这些变化的高频分量的均方根值不超过18英寸。

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