基于近实时精度的GNSS卫星选择的新标准构建和验证
Yue Zuo1, Yibin Yao1, Mingxian Hu1
1School of Geodesy and Geomatics, Wuhan University, Wuhan 430079, China.
Sensors (Basel, Switzerland)
|December 11, 2025
概括
本研究为全球导航卫星系统 (GNSS) 引入了一种新的卫星选择方法,该方法将观测精度与卫星几何相结合. 与传统方法相比,这种加权几何稀释精度 (WGDOP) 方法显著提高了定位精度.
科学领域:
- 卫星导航系统 卫星导航系统
- 地测和地质工程的工程.
- 信号处理 信号处理
背景情况:
- 全球导航卫星系统 (GNSS) 提供了重要的定位,导航和定时 (PNT) 服务.
- 有效的卫星选择对于优化计算负载和保持定位精度至关重要.
- 传统的几何精度稀释 (GDOP) 方法忽略了卫星观测质量,可能导致精度低于最佳.
研究的目的:
- 开发一个改进的卫星选择标准,将近实时卫星观测准确度与几何配置相结合.
- 通过解决现有方法的局限性,提高GNSS定位的可靠性和精度.
- 为了验证拟议方法的性能与既有技术相比.
主要方法:
- 开发了一个加权几何精度稀释 (WGDOP) 标准.
- 使用了无几何无离子体 (GFIF) 和墨尔本-韦贝纳 (MW) 线性组合来估计近乎实时的观测精度.
- 采用移动窗口方法来估计观察准确性.
- 使用全球国际GNSS服务 (IGS) 站数据和低成本设备验证了WGDOP方法.
主要成果:
- 使用GFIF和MW准确度的WGDOP方法,在IGS站测试中比GDOP提高了11.6-12%的定位准确度,比SNR加权提高了6-6.4%.
- 在低成本设备测试中,WGDOP比GDOP提高了22.5-23.3%,比SNR加权提高了23.3-20.5%.
- 动态观察实验证实了WGDOP方法在动态场景中的优越性能.
结论:
- 拟议的卫星选择方法有效地将近实时的观测精度与几何因素相结合,用于增强GNSS定位.
- 与GDOP和SNR权重相比,WGDOP在定位准确度方面提供了显著的改进,特别是在动态环境中.
- 这种方法为各种GNSS应用中卫星选择提供了更强大,更准确的解决方案.
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