基于逐点交汇的双星无源定位方法及误差分析

Double-satellite passive location method and error analysis based on point by point intersection

为了利用双星自身运行轨迹及对空间飞行器的观测数据实现对目标的准确定位,建立基于测向公垂线中点的两站侧向交叉定位模型,逐点交汇定位求解目标运行轨迹,然后对误差偏移量进行分析,发现选取测向公垂线中点作为观测目标位置的偏移量不稳定,不符合系统误差稳定性的要求。基于此,将各观测线的公垂线集合所组成的曲面近似展成平面矩形,化空间曲线轨道为平面直线,重新建立逐点定位模型,并进行误差的评估;修正数据后重新定位精度明显提高。

In order to be able to use two stands＇ location and their observational data on spacecraft to a- chieve accurate positioning, first, the two stand side lateral cross positioning model was built based on the mid-point of the crossover line, positioning the target and solving the orbit through the intersection point by point. Then, the error offset was analyzed with the result, that the error offset is not stable if the mid- point of the crossover line is chosen as the target position, which does not meet the requirements on stabil- ity of systematic error. Based on that, the approximate development of the rectangular plane from the space curved surface with crossover lines made the space curved surface develop into plane linear, re-estab- lishing the location model point by point, and the error was re-evaluated. Finally, the accuracy of positio- ning after correcting the data with the systematic error into consideration was obviously improved.