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

doi:10.11947/j.AGCS.2017.20160222

测绘学报 >

2017 , Vol. 46 >Issue 1: 34 - 43

DOI: https://doi.org/10.11947/j.AGCS.2017.20160222

大地测量学与导航

窄巷FCB估计方法改进及时变特性分析

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信息工程大学地理空间信息学院, 河南郑州 450001

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

收稿日期: 2016-05-12

修回日期: 2016-11-16

网络出版日期: 2017-02-06

基金资助

国家重点研发计划（2016YFB0501701）；国家自然科学基金（41674019；41274015）

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

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School of Surveying and Mapping, Information Engineering University, Zhengzhou 450001, China

Received date: 2016-05-12

Revised date: 2016-11-16

Online 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)

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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

本文引用格式

李林阳, 崔阳, 王宇谱, 吕志平 . 窄巷FCB估计方法改进及时变特性分析[J]. 测绘学报, 2017 , 46(1) : 34 -43 . DOI: 10.11947/j.AGCS.2017.20160222

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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