评估BeiDou-3 PPP-B2b与信号在空间距离错误 (SISRE) 以及其在定位和ZTD估计中的性能
Guangxing Wang1,2, Fen Li2, Wenhai Zhou2
1Key Laboratory of Smart Earth, Beijing 100094, China.
Sensors (Basel, Switzerland)
|November 13, 2025
概括
北斗3的PPP-B2b服务提供实时精确点定位 (RT-PPP) 使用卫星信号,绕过地面网络. 这种基于太空的精确服务实现了对定位和ZTD估计的厘米级准确性.
科学领域:
- 地测和地质工程的工程.
- 卫星导航系统 卫星导航系统
- 地质物理参数估计估计
背景情况:
- 北斗-3导航卫星系统 (BDS-3) 引入了PPP-B2b服务,用于实时精确点定位 (RT-PPP).
- 该服务通过B2b信号传输校正数据,减少对地面基础设施的依赖.
- 评估PPP-B2b校正参数的准确性对于其在定位和大气研究中的应用至关重要.
研究的目的:
- 综合评估PPP-B2b校正参数的准确性.
- 评估PPP-B2b对实时精确定位点 (RT-PPP) 准确性的影响.
- 确定PPP-B2b在估计热层顶峰总延迟 (ZTD) 的有效性.
主要方法:
- 从PPP-B2b校正中获得的BeiDou-3 (BDS-3) 和全球定位系统 (GPS) 卫星轨道和时钟数据的分析.
- 对PPP-B2b衍生差代码偏差 (DCB) 产品与参考数据集 (CAS,CNES) 的比较.
- 执行动力PPP实验,使用GPS和BDS-3联合观测进行定位和ZTD估计.
主要成果:
- PPP-B2b DCB 产品与CAS 参考数据显示出高度一致性 (平均值为1. 不同的. 不同的. < 1.2 ns, std. 的时间. dev. dev. 这是一个很好的例子. <0.11 ns) 的情况.
- 来自PPP-B2b的BDS-3卫星轨道和时钟精度优于CNES实时产品 (轨道:0.07 m,时钟:0.17 ns).
- 动力PPP实现了水平和垂直定位精度为4.3厘米和2.8厘米 (GPS+BDS-3),ZTD精度为1.8厘米 (GPS+BDS-3).
结论:
- PPP-B2b服务表现出强大的性能,在RT-PPP和ZTD估计中达到厘米级准确度.
- 它显示出作为一个独立的,基于太空的精确定位服务的巨大潜力.
- 为了在仅使用GPS定位的场景中实现最佳性能,需要进一步改进.
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