Satellite availability and point positioning accuracy evaluation on a global scale for integration of GPS, GLONASS, BeiDou and Galileo
Satellite availability and point positioning accuracy evaluation on a global scale for integration of GPS, GLONASS, BeiDou and Galileo
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全球范围内的卫星可用性和单点定位精度评估，以集成 GPS、GLONASS、北斗和伽利略
DOI：
10.1016/j.asr.2017.07.029
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发表时间：
2019-05-01
影响因子：
2.6
通讯作者：
Wang, Qianxin
中科院分区：
文献类型：
--
作者：
Pan, Lin;Zhang, Xiaohong;Wang, Qianxin
近年来，随着“格洛纳斯”星座和“北斗”、“伽利略”两个新兴星座的复兴，多星座融合已成为全球卫星导航系统发展的趋势。为了更好地向全球用户展示当前GNSS星座下的定位导航性能，需要研究GPS、GLONASS、北斗和伽利略四星座融合的可行性。在这项研究中，利用31颗GPS卫星、24颗GLONASS卫星、18颗北斗卫星和11颗伽利略卫星在全球范围内的可用性，根据可见卫星的数量、位置精度稀释（PDOP）和在所有类型卫星大约一个重复轨道周期的总时间跨度中可以获得位置解的时间跨度的百分比进行评估。讨论了不同卫星系统间的兼容性对可用性的影响。此外，利用全球分布的59个四系统站连续30天的数据集，对四星座综合双频精确点定位（PPP）、单频精确点定位（PPP）和单点定位（SPP）的性能进行了全面评估。结果表明，多星座融合能显著提高卫星的可用性和定位精度。兼容性的增强还可以提高可用性。可用性可以反映定位性能。(c) 2017年价格。Elsevier Ltd.出版。版权所有。
With the recent revitalization of GLONASS constellation and two newly emerging constellations of BeiDou and Galileo, multi-constellation integration has become a trend in Global Navigation Satellite System (GNSS) development. In order to provide a good indication of the positioning and navigation performance under the current GNSS constellations for the global users, the availability of four-constellation integration with GPS, GLONASS, BeiDou and Galileo should be investigated. In this study, the availability with the use of 31 GPS satellites, 24 GLONASS satellites, 18 BeiDou satellites and 11 Galileo satellites on a global scale is evaluated in terms of the number of visible satellites, the Position Dilution of Precision (PDOP) and the percentage of time span over which the position solutions can be acquired over the total time span during approximately a repeat cycle of orbits for all types of satellites. The effects of compatibility between different satellite systems on availability are discussed. In addition, datasets collected at 59 globally distributed four-system stations on 30 consecutive days are employed to fully assess the performance of four-constellation integrated dual-frequency precise point positioning (PPP), single-frequency PPP and single point positioning (SPP). The results indicate that the multi-constellation integration can significantly improve the availability and positioning accuracy. The enhancement of compatibility can also improve the availability. The availability can reflect the positioning performance. (C) 2017 COSPAR. Published by Elsevier Ltd. All rights reserved.