线性插值在改善GPS共视时间比对性能中的应用  

Application of Linear Interpolation Methods to Improve the Performance of GPS Common-View Time Comparison

作　　者：马慧颖 王威雄 武文俊[1,2,3] MA Huiying;WANG Weixiong;WU Wenjun(National Time Service Center,Chinese Academy of Sciences,Xi'an 710600,China;University of Chinese Academy of Sciences,Beijing 100049,China;School of Astronomy and Space Science,University of Chinese Academy of Science,Beijing 100049,China)

机构地区：[1]中国科学院国家授时中心,西安710600 [2]中国科学院大学,北京100049 [3]中国科学院大学天文与空间科学学院,北京100049

出　　处：《宇航计测技术》2024年第1期48-55,共8页Journal of Astronautic Metrology and Measurement

摘　　要：为了解决GPS共视(CV)时间比对精密度随着基线增长而降低以及在超长基线情况下无法进行共视时间比对计算的问题,利用国际标准GNSS共视归算后星地钟差线性化特性对其进行插值,从而增加可用卫星数量,最后对不同卫星的共视结果进行加权计算,以提高长基线情况下GPS共视时间比对的性能,减少基线长度对共视时间比对的限制。选取中国科学院国家授时中心(NTSC)、韩国计量科学研究院(KRISS)、德国技术物理研究院(PTB)三个守时实验室一个月的星地钟差为数据样本,以300 s为时间间隔对单个卫星的星地钟差数据进行线性插值,随后将所有卫星相同时间的时间比对结果进行等权加权平均,从而获得最终共视时间比对结果。结果表明:NTSC-PTB、KRISS-PTB两条时间比对链路线性插值共视时间比对与GPS精密单点定位时间比对(PPP)结果互差后结果的均方根误差(RMS)分别为0.53 ns、0.8 ns,相比于传统共视,分别提升了48%、54%。In order to solve the problems of the decrease in accuracy of GPS Common View(CV)time comparison with the increase of baseline and the inability to perform common-view time comparison in case of very long baselines,the linearization property of the satellite-ground clock differences based on the international standard CNSS common-view files is used to calculate the interpolation results,which increases the number of available satellites.Finally,the CV results of different satellites are weighted to improve the performance of GPS CV in case of long baselines and to reduce baselines length constraint on CV.The one-month satellite-ground clock differences from three timekeeping laboratories,National Time Service Center(NTSC),Korea Research Institute of Metrology and Science(KRISS),and Physikalisch-Technische Bundesanstalt(PTB),are selected as the data samples,and the satellite-ground clock differences of individual satellite are linearly interpolated with a time interval of 300 s,then the time comparison results of all the satellites at the same time are weighted equally to obtain the final results.The results show that the Root Mean Square(RMS)of time dfference between the linear interpolation CV results and the GPS PPP results on NTSC-PTB and KRISS-PTB links are 0.53 ns and 0.8 ns,respectively,which are improved by 48%and 54%compared to the traditional CV.

关 键 词：线性插值 星地钟差 共视时间比对 时间比对精密度 

分 类 号：P127.1[天文地球—天体测量]