Combining GPS and GLONASS for time and frequency transfer
Combining GPS and GLONASS for time and frequency transfer
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DOI：
10.1016/j.asr.2010.07.003
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发表时间：
2011-01-15
影响因子：
2.6
通讯作者：
Baire, Quentin
中科院分区：
文献类型：
--
作者：
Defraigne, Pascale;Baire, Quentin
大地测量时间和频率传递（TFT）包括对全球导航卫星系统（GNSS）的代码和载波相位观测进行全面建模，以确定连接到GNSS接收器的两个远程时钟之间的同步误差。无论是使用共同的看法（CV），或精密单点定位（PPP），目前全球导航卫星系统的时间传递只使用GPS测量。这项研究将全球定位系统和全球轨道导航卫星系统的观测结合在大地测量TFT中，以确定全球轨道导航卫星系统数据在结果中的附加值。使用软件原子，我们证明了一方面，使用这两个星座改善了CV和PPP结果的解决方案时，分析短的数据批次。在这种情况下，没有足够的GPS代码数据来校准解决方案，并且额外的GLONASS代码数据允许我们检索解决方案的正确绝对值。另一方面，频率转换的CV结果不会因加入全球轨道导航卫星系统数据而受到显著影响，而在PPP中，与全球轨道导航卫星系统的组合会修改频率转换结果，特别是每日频率偏移，仅使用GPS或GPS +全球轨道导航卫星系统获得的TFT解决方案之间的最大差异为150 ps。(C)2010年空间研委会由爱思唯尔有限公司出版。保留所有权利。
Geodetic time and frequency transfer (TFT) consists in a comprehensive modeling of code and carrier phase observations from Global Navigation Satellite System (GNSS) in order to determine the synchronization errors between two remote clocks connected to GNSS receivers. Using either common view (CV), or Precise Point Positioning (PPP), current GNSS time transfer uses only GPS measurements. This study combines GPS and GLONASS observations in geodetic TFT in order to determine the added value of the GLONASS data in the results. Using the software Atomium, we demonstrate on one hand that using both constellations improves the solution for both CV and PPP results when analysing short data batches. In that case, there are not enough GPS code data to calibrate the solution, and additional GLONASS code data allows us to retrieve a correct absolute value for the solution. On the other hand, the CV results of frequency transfer are not significantly affected by adding GLONASS data, while in PPP the combination with GLONASS modifies the frequency transfer results, and in particular the daily frequency offset, with maximum differences of 150 ps between the TFT solutions obtained with GPS-only or GPS + GLONASS. (C) 2010 COSPAR. Published by Elsevier Ltd. All rights reserved.