测绘学报 ›› 2017, Vol. 46 ›› Issue (1): 34-43.doi: 10.11947/j.AGCS.2017.20160222

• 大地测量学与导航 • 上一篇    下一篇

窄巷FCB估计方法改进及时变特性分析

李林阳, 崔阳, 王宇谱, 吕志平   

  1. 信息工程大学地理空间信息学院, 河南 郑州 450001
  • 收稿日期:2016-05-12 修回日期:2016-11-16 出版日期:2017-01-20 发布日期:2017-02-06
  • 通讯作者: 吕志平 E-mail:ssscenter@126.com
  • 作者简介:李林阳(1991-),男,博士生,研究方向为GNSS数据处理理论与方法。E-mail:lilinyang810810@163.com
  • 基金资助:
    国家重点研发计划(2016YFB0501701);国家自然科学基金(41674019;41274015)

Improvement of Narrow-lane Fractional Cycle Bias Estimation and Analysis of Its Time-varying Property

LI Linyang, CUI Yang, WANG Yupu, LÜ Zhiping   

  1. School of Surveying and Mapping, Information Engineering University, Zhengzhou 450001, China
  • Received:2016-05-12 Revised:2016-11-16 Online:2017-01-20 Published:2017-02-06
  • Supported by:
    The National Key Research and Development Program of China (No.2016YFB0501701);The National Natural Science Foundation of China (Nos. 41674019;41274015)

摘要: 窄巷波长相对较短,受观测数据质量和未模型化误差的影响较大,导致参考站计算的窄巷FCB估值的互差较大,窄巷FCB稳定性较差。针对窄巷FCB估值出现较大偏差的参考站,本文提出了基于抗差初值的窄巷FCB抗差估计方法,该方法取当前历元所有参考站窄巷FCB估值的中位数作为抗差初值,采用IGGⅢ方案降低了有偏差的窄巷FCB估值的权比。采用IGS全球跟踪站网的数据进行验证,改进的方法提高了窄巷FCB的精度和稳定性,采用每天估计的一组卫星端的窄巷FCB即可满足窄巷模糊度固定的精度要求。同时,采用本文改进方法估计的窄巷FCB,可以提高用户端仿动态单天解的窄巷模糊度固定成功率和定位精度。

关键词: 窄巷模糊度, 小数周偏差, 中位数, 抗差估计, 时变特性

Abstract: The length of narrow-lane FCB is short, and it's seriously influenced by the quality of observation data and inaccurate models, narrow-lane FCB estimates of different reference station are significantly biased, thus the stability is relatively poor. Aiming at those biased narrow-lane FCB estimates, narrow-lane FCB robust estimation method based on robust initial value is proposed, the median of narrow-lane FCB estimates of all reference stations at current epoch is utilized as the robust initial value, and IGGⅢ scheme is applied to decrease the contribution of biased narrow-lane FCB estimates. Data from IGS global tracking stations are used in the experiment, the accuracy and stability of narrow-lane FCB are improved, the need of narrow-lane ambiguity fixing can be satisfied based on a group of daily estimated satellite narrow-lane FCB. Meanwhile, the success rate of narrow-lane ambiguity fixing and imitated dynamic positioning accuracy are improved.

Key words: narrow-lane ambiguity, fractional cycle bias, median, robust estimation, time-varying property

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