日界不连续误差对GNSS载波相位频率传递的影响

Influence of Day-Boundary Discontinuities on GNSS Carrier Phase Frequency Transfer

为分析日界不连续误差对GNSS载波相位频率传递的影响,采用MGEX/BIPM并址站10 d的GPS/BDS观测数据进行PPP测站钟差解算,在分析测站钟差估计结果日界不连续误差统计特性的基础上,从理论分析和实验验证两方面研究日界不连续误差对两地时钟相对频率偏差估计的影响。结果表明,日界不连续误差基本服从高斯分布,导致两地时钟相对频率偏差估计结果在相邻批单元边界处出现偏移,难以准确估计总时段中相对频率偏差,严重影响两地时钟频率比对结果。

In order to analyze the effect of day-boundary discontinuities on GNSS carrier phase frequency transfer,PPP station clock offsets are estimated based on 10 days of GPS and BDS observations from co-location sites of multi-GNSS experiment(MGEX)and BIPM.On the basis of analyzing the statistical characteristics of day-boundary discontinuities of clock offset estimation results,we study the influence of day-boundary discontinuities on the estimation of relative frequency deviation between two clocks from the aspects of theoretical analysis and experimental verification.The results show that the day-boundary discontinuities are in accordance with Gaussian distribution,causing the jumps of relative frequency deviation at the boundary epochs of two clocks,making it difficult to accurately estimate the relative frequency deviation in the total period,seriously affect the clock frequency comparison results.