On the Choice of the Third-Frequency Galileo Signals in Accelerating PPP Ambiguity Resolution in Case of Receiver Antenna Phase Center Errors
On the Choice of the Third-Frequency Galileo Signals in Accelerating PPP Ambiguity Resolution in Case of Receiver Antenna Phase Center Errors
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DOI：
10.3390/rs12081315
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发表时间：
2020-04
期刊：
影响因子：
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通讯作者：
S. Xin;J. Geng;Jiang Guo;Xiaolin Meng
中科院分区：
文献类型：
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作者：
S. Xin;J. Geng;Jiang Guo;Xiaolin Meng
快速精确单点定位模糊度解算(PPP-AR)对提高精密定位效率具有重要意义。人们期望伽利略多频率(三个或更多频率)数据处理将提供一种有希望的方法来加速PPP-AR。然而，伽利略多频原始数据的不同组合观测值的性能仍然不清楚，丢失的接收器天线相位中心校正的不利影响也没有得到详细的量化。因此，我们研究了未合并的Galileo PPP-AR，使用来自澳大利亚15个站点的30天数据，对比了三种典型的三频组合，即E1/E5a/E5b、E1/E5a/E6和E1/E5/E6信号。我们通过分别应用目前大多数相关文献中使用的官方GPS接收机天线相位中心以及国际导航卫星系统服务处初步测量的伽利略导航接收机天线相位中心，进行了三频PPP-AR。我们发现，与双频(E1/E5a)PPP-AR相比，基于E1/E5a/E5b信号的三频PPP-AR仅缩短了7.6%的收敛时间，而基于E1/E5a/E6和E1/E5/E6的三频PPP-AR的收敛时间意外地分别增加了17.6%和12.7%。然而，在使用导频伽利略相位中心校正后，基于E1/E5a/E5b、E1/E5a/E6和E1/E5/E6信号的三频PPP-AR算法的收敛速度平均分别提高了约16.2%、30.3%和17.7%。因此，我们论证了正确的伽利略接收机天线相位中心对多频PPP-AR收敛的关键影响。此外，三频信号组合E1/E5a/E6在实现快速三频Galileo PPP-AR方面具有优势。
Rapid precise point positioning ambiguity resolution (PPP-AR) is of great importance to improving precise positioning efficiency. There is an expectation that Galileo multi-frequency (three or more frequencies) data processing will offer a promising way to accelerate PPP-AR. However, the performance of different combination observables out of raw Galileo multi-frequency data is still unclear, and the adverse impacts of missing receiver antenna phase center corrections have not been quantified in detail. We therefore studied uncombined Galileo PPP-AR by contrasting three typical triple-frequency combinations, which are E1/E5a/E5b, E1/E5a/E6, and E1/E5/E6 signals, using 30 days of data from 15 stations across Australia. We carried out triple-frequency PPP-AR by separately applying the official GPS receiver antenna phase centers, as currently employed in most relevant literatures, as well as the pilot Galileo receiver antenna phase centers preliminarily measured by the International GNSS Service. We found that, compared to dual-frequency (E1/E5a) PPP-AR, triple-frequency PPP-AR based on E1/E5a/E5b signals shortened the convergence time by only 7.6%, while those based on E1/E5a/E6 and E1/E5/E6 increased unexpectedly the convergence time by 17.6% and 12.7%, respectively, if the GPS receiver antenna corrections were presumed for Galileo signals. However, after using the pilot Galileo phase center corrections, triple-frequency PPP-AR based on E1/E5a/E5b, E1/E5a/E6, and E1/E5/E6 signals could speed up the convergence on average by about 16.2%, 30.3%, and 17.7%, respectively. Therefore, we demonstrate the critical impact of correct Galileo receiver antenna phase centers on multi-frequency PPP-AR convergences. Moreover, the triple-frequency signal combination E1/E5a/E6 is advantageous over others in achieving rapid triple-frequency Galileo PPP-AR.