基于北斗三号的长基线共视时间比对

卫星导航共视时间比对一直是远距离时间比对的重要方法之一。使用我国最新发射的北斗三号全球导航卫星，基于中科院国家授时中心（NTSC）和捷克光电研究院（TP）各自的时间产生和保持系统，开展了中捷北斗三号长基线共视时间比对试验。本文对中捷两站各自的北斗卫星可视数及其卫星高度角情况进行了统计分析，利用Vondark滤波对时间比对结果进行了降噪处理，最后将北斗三号共视时间比对结果与北斗二号及GPS共视时间比对结果进行了比较。结果表明：北斗三号在当前全球组网阶段中捷共视可视卫星数比北斗二号还少的情况下，其共视时间比对精度达到1.16ns，较北斗二号提升约19%，与GPS更为接近。

Long Base-line Common View Time Comparison based on BDS-3

GNSS common view is one of the major remote time transfer methods.BeiDou common view(CV)time comparison has been performed based on the timekeeping system maintained by National Time Service Center,Chinese Academy of Sciences(NTSC)and Institute of Photonics and Electronics,Czech Academy of Sciences(TP)via BDS-3,the Asia-Euro CV time comparison was carried out.Firstly,the single-station BeiDou satellites visual number and satellite elevation are analyzed.Then,the noise reduction processing was carried out by the Vondark filter used the method of the frequency response.Finally,the results of the comparison between the BDS-3 and the BDS-2 and GPS CV were compared.The results show that in the current stage of BeiDou global networking,although the BDS-3 has fewer visible satellites than the BDS-2,the accuracy of the common view is 1.16 ns,which is about 19%higher than that of the BDS-2.It is more closed to GPS than BDS-2.