北斗三号卫星共视时间比对性能分析

Analysis of Common View Time Comparison by BDS-3 Satellite

为评估现阶段北斗三号卫星共视时间比对性能,基于中科院国家授时中心(NTSC)和捷克光电研究院(TP)各自保持的国家时间基准系统,开展了基线长度约7500 km的北斗三号卫星亚欧共视时间比对试验。首先从单站北斗卫星可视数及其卫星高度角两方面进行了分析,然后利用频率响应法确定Vondrak滤波平滑因子后对共视比对数据进行了降噪处理,最后将北斗三号卫星共视时间比对结果与北斗二号卫星及GPS共视时间比对结果进行了比较。结果表明:在当前北斗全球组网阶段,北斗三号卫星在中捷共视可视卫星数比北斗二号卫星少的情况下,其共视时间比对精度达到1.16 ns,较北斗二号提升约19%,10000 s以内的时间和频率稳定度也优于北斗二号。

In order to evaluate the current performance of common view(CV) time comparison via BDS-3 satellite, based on the national time reference system maintained by National Time Service Center, Chinese Academy of Sciences(NTSC) and Institute of Photonics and Electronics, Czech Academy of Sciences(TP), the Asia-Euro CV time comparison with baseline of about 7500 km was carried out by BDS-3 satellite. Firstly, the single-station BeiDou satellites visual number and satellite elevation are analyzed. Then, the noise reduction processing was carried out by the Vondrak filter used the method of the frequency response. Finally, the results of the comparison between the BDS-3 satellite and the BDS-2 satellite and GPS CV were compared. The results show that in the current stage of BeiDou global networking, although the BDS-3 satellite has fewer visible satellites than the BDS-2 satellite, the accuracy of the common view is 1.16 ns, which is about 19% higher than that of the BDS-2 satellite. The time and frequency stability within 10000 seconds are also better than BDS-2 satellite.