Real-time clock comparison and monitoring with multi-GNSS precise point positioning: GPS, GLONASS and Galileo
Real-time clock comparison and monitoring with multi-GNSS precise point positioning: GPS, GLONASS and Galileo
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DOI：
10.1016/j.asr.2019.10.029
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发表时间：
2020-01-01
影响因子：
2.6
通讯作者：
Zhang, Haichuan
中科院分区：
文献类型：
--
作者：
Lyu, Daqian;Zeng, Fangling;Zhang, Haichuan
精确点定位（PPP）技术在时频应用中有着广泛的应用。由于国际GNSS服务的实时服务（RTS）项目，我们可以使用PPP技术进行实时时钟比较和监控。作为RTS的参与者，法国国家空间研究中心（CNES）实施了PPPWIZARD（精确点定位与整数和零差模糊度分辨率演示器）项目，以验证载波相位模糊度分辨率。与CNES的整数ppp （Integer-PPP）不同，PPPWIZARD以实时模式运行，也称为实时IPPP (RT-IPPP)，解决了后处理模式的模糊性。本文重点研究了实时时钟比较和实时监控的实时时钟ppp技术。我们回顾了实时时钟比较和监测的原理，并介绍了RT-IPPP技术的方法。对GPS、GLONASS和Galileo的观测数据进行了处理。实验中提供了五种处理模式，分析了歧义消解和多gnss的优势。在时钟对比实验中，相对于G PPP模式的标准差平均降低率在9.7% ~ 35.0%之间。在时钟监测实验中，G PPP模式可以检测到大于0.9 ns的时钟跳变。GRE PPP AR (G)模式的RT-IPPP技术允许检测任何大于0.6 ns的时钟跳变。对于频率监控，G PPP模式可以检测到大于1.1 × 10（-14）的频率变化。当采用RT-IPPP技术时，采用GRE PPP AR (G)模式监控，可以检测到大于6.1 × 10（-15）的频率变化。(c) 2019 cospar。Elsevier Ltd.出版。版权所有。
The precise point positioning (PPP) technique is widely used in time and frequency applications. Because of the real-time service (RTS) project of the International GNSS Service, we can use the PPP technique for real-time clock comparison and monitoring. As a participant in the RTS, the Centre National d'Etudes Spatiales (CNES) implements the PPPWIZARD (Precise Point Positioning with Integer and Zero-difference Ambiguity Resolution Demonstrator) project to validate carrier phase ambiguity resolution. Unlike the Integer-PPP (IPPP) of the CNES, fixing ambiguities in the post-processing mode, the PPPWIZARD operates in the real-time mode, which is also called real-time IPPP (RT-IPPP). This paper focuses on applying the RT-IPPP for real-time clock comparison and monitoring. We review the principle of real-time clock comparison and monitoring, and introduce the methodology of the RT-IPPP technique. The observations of GPS, GLONASS and Galileo were processed for the experiments. Five processing modes were provided in the experiment to analyze the benefits of ambiguity resolution and multi-GNSS. In the clock comparison experiment, the average reduction ratios of standard deviations with respect to the G PPP mode range from 9.7% to 35.0%. In the clock monitoring experiment, G PPP mode can detect clock jumps whose magnitudes are larger than 0.9 ns. The RT-IPPP technique with GRE PPP AR (G) mode allows for the detection of any clock jumps larger than 0.6 ns. For frequency monitoring, G PPP mode allows detection of frequency changes larger than 1.1 x 10(-14). When the RT-IPPP technique is applied, monitoring with GRE PPP AR (G) mode can detect frequency changes larger than 6.1 x 10(-15). (C) 2019 COSPAR. Published by Elsevier Ltd. All rights reserved.