为PPP-RTK采用一个两步区域离子球建模方法
Zhenyu Xu1, Changsheng Cai1,2, Lin Pan1
1School of Geosciences and Info-Physics, Central South University, Changsha 410083, China.
Sensors (Basel, Switzerland)
|April 13, 2024
概括
本研究引入了一种新的两步电离层建模方法,用于精确的点定位/实时动力学 (PPP-RTK),以提高定位精度. 多项式拟合模型与Kriging插值 (PFM/KI) 结合,显著减少了电离层延迟误差,并加快了融合.
科学领域:
- 地质测量和地质数学
- 大气科学 大气科学
- 卫星导航 卫星导航 卫星导航 卫星导航
背景情况:
- 精确点定位/实时动力学 (PPP-RTK) 依赖于精确的电离层延迟校正,以实现快速收.
- 目前PPP-RTK中的电离层模型经常忽略剩余的电离层延迟,影响定位准确性.
- 现有的方法主要关注电离层总电子含量 (TEC) 变化的趋势术语.
研究的目的:
- 开发和验证一种新的两步区域电离层建模方法,以提高PPP-RTK的性能.
- 通过模拟趋势和剩余TEC变化来提高电离层延迟校正的准确性.
- 评估拟议模型对PPP-RTK融合速度和定位精度的影响.
主要方法:
- 一种两步建模方法,将趋势项的多项式拟合模型 (PFM) 和TEC变化的剩余项的Kriging插值 (KI) 结合起来.
- 使用来自中国湖南省连续运行参考站 (CORS) 的数据集进行验证.
- 与单一的PFM方法和PFM与反向距离权重插值 (IDWI) 结合的方法进行比较.
主要成果:
- 对于模拟的电离层延迟,PFM/KI方法实现了1.8厘米的平均平方根平均值 (RMS) 误差,超过了PFM (48%的改善) 和PFM/IDWI (23%的改善).
- 使用PFM/KI的PPP-RTK在1.8分钟内汇聚到1.3厘米的水平准确度,在4.0分钟内达到2.5厘米的垂直准确度.
- 与PFM相比,收时间减少了18% (水平) 和9% (垂直),与PFM/IDWI相比,收时间减少了14% (水平) 和5% (垂直).
结论:
- 拟议的两步PFM/KI电离层建模显著提高了PPP-RTK中电离层延迟校正的准确性.
- 这种改进的建模导致PPP-RTK应用中更快的融合时间和更高的定位精度.
- PFM/KI方法为现有的电离层建模技术提供了一个优质的替代方案,用于实时运动定位.
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