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北斗卫星导航试验系统是我国第一代自行研制建立的卫星导航定位系统。利用该系统实现单向授时的原理是计算地面中心站与用户机间卫星信号传输延迟,经修正实现本地时钟和系统时钟同步,得到本地的精确时间。为了实现同步,消除“摄动”的影响是至关重要的。这里提出利用“最小二乘”对卫星速度进行多项式拟合,消除卫星运动对授时精度影响的方法。通过与直接法(没有进行最小二乘拟合)比较,发现前者能将“摄动”对授时精度的影响降低在10ns以内。介绍并分析了这种方法,并得出了分析结论。
Beidou satellite navigation test system is China’s first generation of self-developed satellite navigation and positioning system. The principle of using this system to achieve one-way timing is to calculate the transmission delay of the satellite signal between the ground center station and the user plane. After being corrected, the local clock and the system clock are synchronized to obtain the local accurate time. In order to achieve synchronization, eliminating the “perturbation” effect is crucial. Here we propose to use polynomial fitting of satellite speed by “least square ” to eliminate the impact of satellite motion on the timing accuracy. Compared with the direct method (without the least-squares fitting), the former can reduce the impact of “perturbation ” on the timing accuracy within 10ns. Introduced and analyzed this method, and reached the conclusion of the analysis.