岸船卫星双向时间比对及其误差分析

Ship-shore Two-way Satellite Time Transfer and Its Error Analysis

详细介绍了岸船卫星双向时间比对原理,从原理得出,影响卫星双向时间比对精度的因素主要有2项:TA和TB的测量精度和双向比对链当中的不一致性。分析各误差源对岸船时间比对精度的影响,表明主要误差源为两站设备时延,它是由岸船通信系统时钟和时统时钟不同源引起的采样误差,误差最大达到0.104 ms;而测量误差和由于卫星和地面站运动引起的误差较小,一般不超过ns级。

The basic theory of ship-shore Two-Way Satellite Time Transfer （TWSTT） is introduced. The theory shows that there are two major factors influencing the transfer accuracy, one is the measurement accuracy of TA and TB, and the other is the difference between two-way transmission links. Then,the error sources of ship-shore TWSTT are discussed, the result shows that the major error source is the stations＇ equipment delay which is the sampling error caused by the different source clocks, and the error can reach up to 0.1 ms. The measurement error and the error caused by motion of the satellite and the earth station are rather small, not exceeding the order of ns.