共位卫星相对距离测量技术研究

为完成共位卫星的自主导航任务，需要获得多目标之间实时、高精度的相对距离，并进行数据交互。介绍了伪码测距的原理，提出以双向微波链路为基础，运用扩频技术进行同步轨道共位卫星精密相对距离测量。分析了伪码跟踪环路、钟差变化及其它因素对相对测距的影响，并给出了模拟实验研究结果，得出相对测距误差可小于30cm的结论。

Research on Relative Ranging of Common Orbit Satellites

In order to accomplish the mission of autonomous navigation, such as common orbit satellites, it requires high accuracy real time multi-object ranging and communication. Basic principle of PN ranging is introduced in this paper. Based on two-way microwave link, with spread spectrum technology, a design method for relative ranging of common orbit satellites on synchronous earth orbit is presented. The ranging error due to the error of pseudorandom code tracking loop, the change of relative frequency difference and other errors is analyzed. Simulation test results Show that the relative ranging error can be less than 30cm.