多GNSS 大面积 PPP-RTK 在离子层异常时期的性能
Zhu Wang1,2, Guangbin Yang1, Rui Huang3
1School of Geography & Environmental Science, Guizhou Normal University, Guiyang 550001, China.
Sensors (Basel, Switzerland)
|April 12, 2025
概括
离子层异常显著降低全球导航卫星系统 (GNSS) 精确点定位与实时动态 (PPP-RTK) 服务,增加收时间和降低定位精度. 随着更多的卫星系统,性能得到了提高,尽管有电离层的干扰.
科学领域:
- 地质测量和地质数学
- 太空天气和电离层物理学
- 卫星导航系统 卫星导航系统
背景情况:
- 使用实时动力学 (PPP-RTK) 精确点定位对于高精度GNSS应用至关重要.
- 现有的研究往往忽视了在电离层异常期间的PPP-RTK性能,例如在雷暴期间的异常.
- 电离层干扰对GNSS信号传播和定位准确性产生重大影响.
研究的目的:
- 在电离层活性条件下分析PPP-RTK的性能退化.
- 量化电离层异常对未校准相位延迟 (UPD) 余量,大气建模和定位精度的影响.
- 评估增加的卫星星座 (GPS,利略,BDS) 在电离层干扰期间对PPP-RTK弹性的影响.
主要方法:
- 来自305个澳大利亚站的13天GNSS数据的分析,包括电离层异常和平静时期.
- 评估宽车道和窄车道的UPD残留物和大气延迟估计的准确性.
- 评估PPP-RTK定位精度和仅GPS,GPS+利略和GPS+利略+BDS解决方案的收时间.
主要成果:
- 离子层异常使UPD精度降低了高达2.4%,并使离子层/热层延迟估计分别降低了167.1%和17.3%.
- 在异常期间,PPP-RTK的融合时间显著增加 (25.0%-87.2%),定位精度下降 (5.5%-18.5%),随着卫星星座的变化而有所不同.
- 增加的卫星系统改善了定位性能,但由于电离层活动造成的退化仍然很大.
结论:
- 电离层异常严重破坏PPP-RTK服务,降低电离层延迟估计,影响定位结果.
- 虽然电离层干扰会降低性能,但利用更多的卫星系统可以提高PPP-RTK的弹性.
- 这项研究为PPP-RTK在不利的电离层条件下的行为提供了关键的见解,突出了对强大的算法的需求.
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