GPS多接收机组合的共视时间比对技术研究

Research on Common View Time Comparison of GPS Multi-receiver Combinations

为提高GPS共视时间比对的性能,本文介绍了利用中科院国家授时中心(NTSC)和德国物理技术研究院(PTB)两个守时实验室的多台接收机,基于多接收机组合技术原理,构建了NTSC和PTB各自的多接收机组合系统,采用数据融合技术,计算得出两个多接收机系统的观测数据并进行了时间比对试验及性能分析。结果表明,多接收机组合不仅提高了GPS共视的可靠性和稳定性,且提高了时间比对链路的精度。多接收机链路共视时间比对结果的标准偏差STDEV为1.36ns,比单接收机链路时间比对结果的STDEV值平均提高了19.4%,日稳可达3.2×10^-14。

GPS common view(CV)has always been one of the main technical means of international time comparison,in order to improve the performance of GPS common-view time comparison,utilizing multiple receivers of the two timekeeping laboratories of the National Time Service Center(NTSC)and the German Physikalisch-Technische Bundesansalt(PTB),based on the technical principle of multi-receiver combination,compose two multi-receiver systems,use multi-receiver data fusion technique,calculate the observation data of two multi-receiver systems and verify the time comparison test.The results showed that Multi-receiver combination not only improves the reliability and stability of GPS common view,but also improves the accuracy of time comparison link.The multi-receiver link GPS CV time transfer standard deviation(STDEV)value is 1.36 ns,compared with the single receiver link time,the result is improved on average19.4%.the stability can reach 10^-14(1 d).