›› 2013, Vol. 33 ›› Issue (1): 37-44.doi: 10.3780/j.issn.1000-758X.2013.01.006

• 技术交流 • 上一篇    下一篇

精密单点定位部分模糊度固定方法

赵兴旺, 张翠英   

  1. (安徽理工大学测绘学院,淮南232001)
  • 收稿日期:2012-04-05 修回日期:2012-07-11 出版日期:2013-02-25 发布日期:2013-02-25
  • 作者简介:赵兴旺 1982年生,2011年获东南大学仪器科学与技术专业博士学位,讲师。研究方向为GNSS精密定位(网络RTK和PPP技术)理论研究。
  • 基金资助:

    安徽省国土资源科技(2011-K-22)资助项目

Partial Ambiguity Fixing Method and Analysis for Precise Point Positioning

Zhao Xingwang,Zhang Cuiying   

  1. (School of Geodesy and Geomatics, Anhui University of Science & Technology, Huainan 232001)
  • Received:2012-04-05 Revised:2012-07-11 Online:2013-02-25 Published:2013-02-25

摘要: 提出一种新的模糊度固定方法,并把算法应用到精密单点定位(Precise Point Positioning,PPP)中,将模糊度进行选择固定,以实现恶劣环境下快速、有效获得较高PPP固定解的目的。该方法以模糊度固定成功率和Ratio因子为约束条件,基于最小方差优先固定的模糊度子集选取方法实现PPP中模糊度的部分固定。算例从模糊度固定可靠性、收敛速度以及PPP固定解精度等方面对部分模糊度固定方法进行了分析。结果表明,该方法使得PPP模糊度固定的平均可靠性比传统固定方法提高了近一倍、参数解算的平均收敛时间缩短了1/4左右。因此,更适合在初始阶段观测信息较少或残余误差较大而难以固定全部模糊度的时候,快速获得较高精度的PPP固定解。

关键词: 精密单点定位, 模糊度固定, 模糊度子集, 全球导航卫星系统

Abstract: According to the slow convergence of precise point positioning(PPP) in noisy environment, a partial ambiguity fixing(PAF)method was proposed based on LAMBDA algorithm, and then the ambiguity subset with constraint of maximum success rate and Ratio value was defined according to the basic idea of the more accuracy for the float solution, the easier for right fixing. Finally, the validity of PAF method for PPP fixed solution was analyzed in terms of the reliability of ambiguity fixed, convergence speed and positioning accuracy. The results show that the performance of precise point positioning is improved by the PAF method. Compared with traditional method, the convergence time of ambiguity resolution is shortened by about 1/4, and the reliability is increased by almost 2 times. Especially for less measurement information in the initialization stage or lager residual error in which it is difficult to fix all the ambiguity, a higher accuracy for PPP fixed can be quickly obtained solution by PAF method.

Key words: Precise point positioning, Ambiguity fixing, Ambiguity subset, Global navigation satellite system