微小卫星编队的星间测距系统设计及精度分析

Design of inter-satellite ranging system in formation and its precision analysis

提出了不依赖于GPS的小卫星编队星间测距方法.为满足编队卫星小型化任务的需求,该系统在不增加硬件的情况下,将测距功能集成于原有的星间通信设备上,实现同一星间链路下通信、测距功能的一体化.该方法以传统应答机模式为基础,将信号往返于两星间的传输延时转换为距离,通常精度仅能达到几十米,为将精度进一步提高,分析影响测距精度的原因,提出概率补偿算法,并得到了在不同的风险概率下,达到不同精度时卫星所要发送的测距包的理论公式,使得系统的测距精度可以提高一个数量级.

An inter-satellite r^nging method without order to meet the request of satellite miniaturization, GPS system in formation-flying satellites is presented. In ranging function is integrated with the original inter-satellite communication system without adding hardware equipments. By taking the traditional responder pattern as the ranging methods, and calculating the time delays in the system to distance, the obtained ranging precision can reach decades of meters. To improve the ranging precision, the factors affecting it are analyzed, and a probability compensation algorithm is proposed using the error compensation theory. Then a theoretical formula is settled about ranging packages at different risk probability and different ranging precision, which can increase the ranging precision by a number magnitude.