使用可变随机步行过程噪声改进了GPS热层路径延迟估计
Zachary M Young1,2, Geoffrey Blewitt1, Corné Kreemer1
1Nevada Bureau of Mines and Geology, University of Nevada, 1664 N Virginia St. MS 178, Reno, NV 89557 USA.
Journal of geodesy
|October 10, 2024
概括
在全球定位系统 (GPS) 分析中优化热层限制可以提高定位准确性. 松开顶潮湿延迟 (ZWD) 约束减少了错误,并提高了水蒸气估计.
科学领域:
- 地测和地动力学 在地测和地动力学
- 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:
- 准确的全球定位系统 (GPS) 定位需要精确建模热层延迟.
- 不足的热层延迟变化可能导致位置估计的系统错误,特别是垂直移位.
- 相反,过于松散的约束会放大噪音,降低整体精度.
研究的目的:
- 在GipsyX软件中调查最佳的热层约束,以改进GPS定位.
- 为了评估随机步行过程噪声对潮延迟 (ZWD) 估计的影响.
- 为了提高24小时GPS解决方案的准确性和精确的轨道参数.
主要方法:
- 利用5分钟GPS估计位置的变化作为热层误差的代理.
- 分析了不同ZWD约束值 (随机步行过程噪声) 对位置估计的影响.
- 将5分钟的加权平均值与24小时的解决方案进行比较,以评估对日常产品的影响.
主要成果:
- 默认的ZWD约束为3mm/√(hr) 在冬季风暴Ezekiel期间产生了虚假的波形垂直移位 (~100mm).
- 将ZWD约束放宽到6-12mm/√(hr) 抑制了这些虚假信号,降低了垂直变化,并改善了水蒸气估计.
- 局限性的区域或特定站点优化进一步增强了结果.
结论:
- 建议在5分钟的数据间隔内将默认的ZWD约束从3mm/√{hr}放宽到至少6mm/√{hr}.
- 最佳的全球ZWD约束通常在6-12mm/√{hr}范围内.
- 对于不同的数据间隔,应使用公式 √(x/300) 来缩放约束值.
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