编队小卫星间相对测距和时间同步方法研究

Research on Relative Ranging and Time Synchronization Between Formation Flying Small Satellites

介绍了编队飞行小卫星的特点,提出采用无线电双向单程测距方法实现星间相对测距和时间同步,计算了伪码和载波相位跟踪环路、星间相对运动、钟差变化、测量设备延迟、天线相位中心误差带来的星间相对测距和时间同步误差,讨论了降低误差的方法.对误差项进行综合分析后,得出星间相对测距误差可达到厘米级,时间同步测量误差优于0.1 ns的结论.

The paper introduces the character of formation flying small satellites, and then puts forward a design method for inter-satellite relative ranging and time synchronization. The author ana lyzes the ranging and time synchronization error due to the error of code and carrier phase tracing loop, and the error of relative motion of satellites and the change of time-tag between satellites. The time delay error of the radio tracing and instrumentation in satellites and the antenna phase center error are introduced. The method for reducing those errors is discussed. In the end, the author analyzes the results and obtains the error of relative ranging being less than lOcm and the error of time syn chronization being no more than 0. 1 ns.