BDS Precise Point Positioning for Seismic Displacements Monitoring: Benefit from the High-Rate Satellite Clock Corrections.
BDS Precise Point Positioning for Seismic Displacements Monitoring: Benefit from the High-Rate Satellite Clock Corrections.
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北斗精密单点定位地震位移监测：受益于高速卫星时钟改正
DOI：
10.3390/s16122192
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发表时间：
2016-12-20
期刊：
影响因子：
--
通讯作者：
Liu J
中科院分区：
文献类型：
--
作者：
Geng T;Su X;Fang R;Xie X;Zhao Q;Liu J
为满足高速率、高精度应用的需求，基于北斗卫星导航系统（BDS）的精密轨道产品，生成北斗卫星导航系统（BDS）1 Hz卫星钟改正量，并与其他分析中心的钟改正量进行比较，对北斗卫星导航系统1 Hz卫星钟改正量的质量进行评估。比较结果表明，地球静止轨道（GEO）的钟差均方根（RMS）约为0.63ns，而倾斜地球同步轨道（IGSO）和中地球轨道（MEO）的钟差均方根分别约为0.2- 0.3ns和0.1ns。然后，将1 Hz时钟产品用于BDS精密单点定位（PPP），以检索2015年尼泊尔廓尔喀Mw7.8地震的地震位移。从BDS PPP导出的地震位移与全球定位系统（GPS）PPP的地震位移一致，东、北和垂直分量的RMS分别为0.29、0.38和1.08 cm。此外，还对1 s、5 s、30 s和300 s不同时钟间隔的BDS PPP解决方案进行了处理和比较。结果表明，时钟间隔为300 s的PPP性能最差，时钟间隔为1 s的PPP性能最好。对于5s时钟间隔的情况，PPP解的精度几乎与1 s的结果相同。考虑到时钟估计的时间消耗，我们建议5秒的时钟间隔是高速率BDS解决方案的能力。
In order to satisfy the requirement of high-rate high-precision applications, 1 Hz BeiDou Navigation Satellite System (BDS) satellite clock corrections are generated based on precise orbit products, and the quality of the generated clock products is assessed by comparing with those from the other analysis centers. The comparisons show that the root mean square (RMS) of clock errors of geostationary Earth orbits (GEO) is about 0.63 ns, whereas those of inclined geosynchronous orbits (IGSO) and medium Earth orbits (MEO) are about 0.2–0.3 ns and 0.1 ns, respectively. Then, the 1 Hz clock products are used for BDS precise point positioning (PPP) to retrieve seismic displacements of the 2015 Mw 7.8 Gorkha, Nepal, earthquake. The derived seismic displacements from BDS PPP are consistent with those from the Global Positioning System (GPS) PPP, with RMS of 0.29, 0.38, and 1.08 cm in east, north, and vertical components, respectively. In addition, the BDS PPP solutions with different clock intervals of 1 s, 5 s, 30 s, and 300 s are processed and compared with each other. The results demonstrate that PPP with 300 s clock intervals is the worst and that with 1 s clock interval is the best. For the scenario of 5 s clock intervals, the precision of PPP solutions is almost the same to 1 s results. Considering the time consumption of clock estimates, we suggest that 5 s clock interval is competent for high-rate BDS solutions.
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