用单频非组合PPP模型估计BDS-3卫星差异代码偏差
Jizhong Wu1, Shan Gao1, Dongchen Li1
1School of Geomatics Science and Technology, Nanjing Tech University, Nanjing 211800, China.
Sensors (Basel, Switzerland)
|September 28, 2023
概括
使用单频精确点定位估计 BeiDou-3 卫星差异代码偏差 (DCB) 显示了度依赖. 中高度站通过减轻电离层变异性来提高DCB估计的准确性.
科学领域:
- 地测和地球物理学的地质学.
- 卫星导航系统 卫星导航系统
- 大气科学 大气科学
背景情况:
- 差异代码偏差 (DCB) 是一种影响卫星定位和电离层建模的重大系统错误.
- 准确估计DCB对于提高全球导航卫星系统 (GNSS) 的性能至关重要.
研究的目的:
- 为了估计 BeiDou-3 全球导航卫星系统 (BDS-3) 卫星DCB,使用单频 (SF) 非组合精确点定位 (PPP) 模型.
- 调查电站度对卫星DCB估计准确性的影响.
主要方法:
- 利用2023年3月全球25个国际GNSS服务 (IGS) 站的BDS-3 B1观测结果.
- 采用单频未结合精确点定位 (PPP) 模型进行DCB估计.
- 分析了DCB估计准确性的度依赖和半球差异.
主要成果:
- 卫星DCB估计的准确性表现出显著的度依赖,在低度地区变化更大.
- 中高度站显示了卫星DCB的更一致和更稳定的根平均平方 (RMS) 值.
- 排除低度站和使用来自17个中高度站的数据,将绝对偏移的RMS降低到0.63 ns以下.
结论:
- BDS-3卫星DCB估计的准确性受到地理度和电离层变异性的影响.
- 纳入足够数量的中高度站对于使用SF观测进行可靠的DCB估计至关重要.
- 这项研究强调了空间站分布在减轻电离层影响对精确的卫星导航的重要性.
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