数据与计算发展前沿 ›› 2022, Vol. 4 ›› Issue (4): 3-12.

CSTR: 32002.14.jfdc.CN10-1649/TP.2022.04.001

doi: 10.11871/jfdc.issn.2096-742X.2022.04.001

• 专刊: 北斗导航数据处理 • 上一篇    下一篇

非组合模型估计卫星相位偏差及其精密单点定位模糊度固定应用

刘煜1,2(),刘腾1,张宝成1,*()   

  1. 1.中国科学院精密测量科学与技术创新研究院,湖北 武汉 430071
    2.中国科学院大学,北京 100049
  • 收稿日期:2022-03-15 出版日期:2022-08-20 发布日期:2022-08-10
  • 通讯作者: 张宝成
  • 作者简介:刘煜,中国科学院精密测量与技术创新研究院,硕士研究生,研究方向为GNSS精密单点定位模糊度固定。
    本文中承担算法实现与实验设计。
    LIU Yu is a graduate student at the Innovation Academy for Precision Measurement Science and Technology of Chinese Academy of Sciences, majoring in multi-GNSS PPP ambiguity resolution.
    In this paper, he is responsible for the implementation of the algorithm and the design of experiments.
    E-mail: liuyu@apm.ac.cn|张宝成,中国科学院精密测量与技术创新研究院,研究员,主要研究方向为多系统PPP-RTK建模与应用。
    本文中负责算法设计。
    ZHANG Baocheng is a professor at the Innovation Academy for Precision Meas-urement Science and Technology of Chinese Academy of Sci-ences. His research focuses on modeling multiple global navi-gation satellite systems for integer ambiguity resolution-enabled precise point positioning (PPP-RTK) applications.
    In this paper, he is responsible for the design of the algorithm.
    E-mail: b.zhang@whigg.ac.cn
  • 基金资助:
    国家自然科学基金(41774042);国家自然科学基金(42174034);湖北省重点研发计划(2020BHB014)

The Estimation of Satellite Phase Bias Based on Uncombined Model and Its Application in Precise Point Positioning Ambiguity Resolution

LIU Yu1,2(),LIU Teng1,ZHANG Baocheng1,*()   

  1. 1. Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan, Hubei 430071, China
    2. University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2022-03-15 Online:2022-08-20 Published:2022-08-10
  • Contact: ZHANG Baocheng

摘要:

【目的】模糊度固定是实现全球导航卫星系统(Global Navigation Satellite System, GNSS)快速高精度定位的关键,本文基于非组合模型实现了精密单点定位(Precise Point Positi-oning, PPP)模糊度固定。【方法】基于奇异基理论,通过选择适当基准来消除整周模糊度与相位偏差之间的秩亏,实现了卫星相位偏差(Satellite Phase Bias, SPB)与模糊度的有效分离与精确估计,继而辅助用户端完成模糊度固定。【结果】结果表明本文估计的SPB能有效恢复用户端模糊度的整周特性并能显著缩短PPP收敛时间与提高定位精度,和浮点解相比,固定解三维收敛时间分别由68、28、33min缩短至28.5、21.5、26.5min,定位精度分别提升49%、40%、22%。【结论】基于非组合PPP模型的模糊度固定算法,对GNSS快速、高精度定位具有重要意义。

关键词: 精密单点定位, 非组合模型, 卫星相位偏差, 模糊度固定

Abstract:

[Objective] Ambiguity resolution (AR) plays a key role in achieving fast and high-precision positioning of the Global Navigation Satellite System (GNSS). This paper implements the precise point positioning (PPP) ambiguity resolution based on the uncombined model. [Methods] By applying Singularity-basis theory, the rank deficiencies between integer ambiguities and phase biases are fully eliminated through choosing appropriate bases, thus the satellite phase biases (SPBs) can be effectively separated from ambiguities and accurately estimated from a GNSS network, and reliable integer ambiguity resolution enabled PPP is naturally fulfilled. [Results] We succeed in recovering the property of the user-end ambiguities to a natural integer with the aid of SPB corrections estimated by a regional reference network, resulting in substantial improvement in positioning performance. Compared to the ambiguity float solution, the three-dimensional convergence time of the ambiguity fixed solution decreased from 68, 28, and 33 minutes to 28.5, 21.5, and 26.5 minutes, and the positioning accuracy improved by 49%, 40%, and 22% respectively. [Conclusions] The ambiguity resolution algorithm based on the uncombined PPP model is crucial for the fast and high-precision positioning of GNSS.

Key words: precise point positioning, uncombined model, satellite phase bias, ambiguity resolution