精密定轨与时间同步系统噪声对GNSS卫星钟性能评估的影响分析

利用精密定轨与时间同步（ODTS）解算出的精密钟差产品求解其系统噪声，然后对系统噪声进行性能分析。分别采用IGS、Sta(IAC俄罗斯空间局分析中心发布的钟差产品)、GBM钟差产品进行实验，结果表明，ODTS系统噪声对在轨原子钟性能的影响在可接受的水平；采用IGS与Sta提供的精密钟差产品可以实现对GPS和GLONASS星载原子钟的在轨性能评估，GBM产品可以实现对BDS星载铷钟的性能评估以及天稳级别氢钟的性能评估。

The Effect of Precise Orbit Determination and Time Synchronization System Noise on the Performance of GNSS On-Board Clock Evaluation

In this paper, the method of precise orbit determination and time synchronization(ODTS) is proposed to calculate the precise clock bias of two external high-precision atomic clocks, and then the performance of the system noise is analyzed. The products of IGS, Sta(published by IAC Russian space bureau analysis center) and GBMare employed for computations and comparisons respectively. The results show that the IGS and Sta clock products can be used to assess the performance of the satellite on-board clock. Furthermore, the GBM product can effectively achieve the performance evaluation of the BDS rubidium clock and the day stability of the hydrogen clock.