Research of GPS PPP Based on Weighted State Covariance Matrix

ZHANG Ji-hai; DONG Shao-wu; YUAN Hai-bo; GUANG Wei

doi:10.3969/j.issn.0372-2112.2020.11.014

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Research of GPS PPP Based on Weighted State Covariance Matrix

更新时间：2025-12-08

- Research of GPS PPP Based on Weighted State Covariance Matrix
- Acta Electronica Sinica Vol. 48, Issue 11, Pages: 2196-2201(2020)
- 作者机构：
  
  1. 中国科学院大学,北京,100049
  2. 中国科学院国家授时中心,陕西,西安,710600
  3. 中国科学院时间频率基准重点实验室,陕西,西安,710600
  4. 中国科学院大学天文与空间科学学院,北京,100049
  5. 中国科学院大学,北京,100049
  6. 中国科学院国家授时中心,陕西,西安,710600
  7. 中国科学院时间频率基准重点实验室,陕西,西安,710600
  8. 中国科学院大学天文与空间科学学院,北京,100049
- 作者简介：
- 基金信息：
  
  National Time Service Center, Chinese Academy of Sciences Young Innovative Talents (No.NTSC青创201804);West Light Foundation of The Chinese Academy of Sciences (B Class Youth Scholars) (No.XAB2019B13);National Natural Science Foundation of China (No.11773030)
- DOI：10.3969/j.issn.0372-2112.2020.11.014
  CLC： TH714
- Published Online：25 November 2020，
  
  Published：2020
- 稿件说明：
移动端阅览
ZHANG Ji-hai, DONG Shao-wu, YUAN Hai-bo, et al. Research of GPS PPP Based on Weighted State Covariance Matrix[J]. Acta Electronica Sinica, 2020, 48(11): 2196-2201.
DOI：

ZHANG Ji-hai, DONG Shao-wu, YUAN Hai-bo, et al. Research of GPS PPP Based on Weighted State Covariance Matrix[J]. Acta Electronica Sinica, 2020, 48(11): 2196-2201. DOI： 10.3969/j.issn.0372-2112.2020.11.014.

摘要

精密钟差以及天顶对流层时延是GPS PPP解算的重要参数.本文通过在PPP数据处理过程中加入基于更新迭代的状态协方差阵作为取权因子，分别在高精度时间比对和天顶对流层时延方面利用单向滤波以及双向加权滤波对PPP解算的钟差及对流层时延进行估计与分析.结果表明，在零基线比对方面，经加权估计的钟差标准偏差优于单向结果，提高在30%以上；在时间比对方面，利用加权估计的钟差与国际权度局发布的钟差在频率稳定度上水平相当；最后，在天顶对流层时延估计方面，两种方法相对于IGS分析中心公布的天顶对流层时延的残差均方根误差中，加权估计的天顶对流层时延也略有提高.

Abstract

The precision clock and zenith tropospheric delay (ZTD) are important parameters of GPS PPP solution. In this paper

the state covariance matrix based on update iteration is used for the weight calculation in GPS PPP data processing. The results of PPP are estimated by using one-way and two-way filtering weighted in time comparison and ZTD. The results show that in the PPP zero-baseline common clock comparison

the standard deviation to the time difference of the weighted is significantly better than that of the one-way

and the deviation is increased by more than 30%. The result of frequency stability is estimated with weighted is equivalent to the Bureau International des Poids et Mesures in time comparison. And the root mean square of residual to the final results between two methods and the results published by the IGS for the ZTD

the results of the weighted estimation are also slightly improved.

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