随着天线定位机构运动日趋复杂以及对定位机构任务要求的不断提高,提高指向精度已成为星载天线机构能力提升的核心。综合考虑卫星姿态控制误差、展开机构误差、双轴驱动机构误差和反射面误差等因素,利用齐次变换矩阵得到天线指向运动学误差等式,从而得到天线指向精度分析的一般方法。以某星载点波束定位机构为例,对各误差源的影响进行了分析,得到双轴驱动机构任意转角位置下各误差源对最终指向精度的影响,分析结果表明：姿态控制误差、展开机构锁定误差对精度的影响不容忽视,需要综合考虑各部分误差因素,才能从根本上提高天线的指向精度。%With the increase of the complexity of the antenna oriented mechanism and the higher requirement of mission,the improvement of the pointing accuracy has been the core of the capability improvement for satellitic antenna.With a comprehensive consideration of the errors of satellite attitude control,the errors of deployment mechanism,the errors of two-axis drive mechanism and the errors of the reflector,the transformation matrix are used to get the kinematic error equations of antenna pointing.Thus a common method of the analysis on the pointing accuracy of the antenna is obtained.Then the effect of each error is analyzed on a point-beam oriented mechanism of a satellitic antenna,and the effect of each error on the final pointing accuracy is gotten under every rotational position of the two-axis drive mechanism.The results show that the effects on the pointing accuracy of the errors of the satellite attitude control and the locking error of the deployment mechanism cannot be ignored.Therefore,in order to radically improve the pointing accuracy of the antenna,the effect of every error is necessary to take into account comprehensively.
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