北斗2导航卫星星间测距与时间同步技术

Inter-Satellite Ranging and Time Synchronization Technique for BD2

针对北斗2导航卫星之间通过星间链路进行距离测量和时间同步以实现星座自主导航功能,提出了一种动态环境下基于伪码高精度距离测量和时间同步技术。它根据狭义相对论中光速不变基本原理,扩展了静态环境下双向测距和时间同步(Two-Way Ranging and Time Transmit,TWRTT)技术,使之适用于北斗2导航卫星这样的动态环境之下。理论、仿真以及工程可实现性分析表明:利用该技术,北斗2导航卫星星间测距精度可达厘米级,时间同步精度优于1ns。

It is significant for the BD2 constellation autonomous navigation to use an inter-satellite ranging and time synchronization technique through inter-satellite crosslink.Based on the light velocity be constant principle in the special relativity a Two-Way Ranging and Time Transfer（TWRTT） method is extended from static situation to dynamic situation in this paper.And the extended TWRTT method is used for BD2 navigation satellite inter-satellite raning and time synchronization.The analysis result from theory,simulaiton and engineering show that the ranging accuracy approachs to centimeter-level and time synchronization accuracy is better than one nanosecond.