载体运动对星敏感器星点光斑定位的影响分析

Effects of Carrier Movement on the Star Spots Locating of Star Sensors

为研究载体运动对星敏感器测量精度的影响,首先,根据星点光斑细分定位算法,对星点光斑质心提取的误差来源进行了分析;然后,根据光学成像原理,分别建立了由载体角运动和振动运动造成的星点光斑变形的数学模型,并利用质心法对发生变形的星点光斑造成的定位误差进行了分析;最后,对由载体的角运动和振动造成的星点光斑定位误差进行了仿真验证。仿真结果表明,载体角运动造成的星点光斑定位误差随角速度的增大而增大;载体振动造成的星点光斑定位误差随着振动频率的增大呈现振荡衰减的趋势,与振动振幅成近似线性增长的关系。

In order to investigate the effects of carrier movement on the measurement of star sensors,Firstly,according to the subdivision method of star spots,the locating error sources of star spots are analyzed;Secondly,based on the principle of optical imaging,the mathematical models of distorted star spot caused by carrier angular motion and vibration motion are established respectively,and the locating errors of distorted star spots utilizing centroid algorithm are analyzed;Finally,the locating errors of distorted star spots caused by carrier angular motion and vibration are simulated.The simulation results indicate that the locating error of distorted star spots caused by carrier angular motion increases with the growth of angular velocity;the locating error of distorted star spots induced by carrier vibration decreases with the augment of vibration frequency,while it increases linearly with the increasing of vibration amplitude.