削弱GNSS多路径效应的半天球格网点建模方法

doi:10.11947/j.AGCS.2020.20190184

测绘学报 ›› 2020, Vol. 49 ›› Issue (4): 461-468.doi: 10.11947/j.AGCS.2020.20190184

削弱GNSS多路径效应的半天球格网点建模方法

王亚伟, 邹璇, 唐卫明, 崔健慧, 李洋洋

武汉大学卫星导航定位技术研究中心, 湖北武汉 430079

收稿日期:2019-05-11 修回日期:2019-11-27 发布日期:2020-04-17
通讯作者: 唐卫明 E-mail:wmtang@whu.edu.cn
作者简介:王亚伟(1991-),男,博士生,研究方向为GNSS精密数据处理。E-mail:grcwongyw2016@whu.edu.cn
基金资助:
国家重点研发计划（2018YFB0505201）；武汉市科技计划（2018010401011271）；国家自然科学基金（41874037）；中央高校基本科研业务费专项（2042018gf0001）；装备预研教育部联合基金（6141A02022372）；北斗重大专项（GFZX030302030205）

A method for mitigating GNSS multipath effect based on multi-point hemispherical grid model

WANG Yawei, ZOU Xuan, TANG Weiming, CUI Jianhui, LI Yangyang

GNSS Research Center, Wuhan University, Wuhan 430079, China

Received:2019-05-11 Revised:2019-11-27 Published:2020-04-17
Supported by:
The National Key Research and Development Program of China (No. 2018YFB0505201);The Wuhan Science and Technology Project (No. 2018010401011271);The National Natural Science Foundation of China (No. 41874037);The Fundamental Research Funds for the Central Universities (No. 2042018gf0001);The Joint Fund of Ministry of Education for Equipment Pre-research (No. 6141A02022372);The Beidou Navigation Satellite System Major Special Project (No. GFZX030302030205)

摘要/Abstract

摘要： 多路径效应与测站观测环境相关，无法利用差分的方式消除或削弱，是GPS精密数据处理时的主要误差源。为此，本文提出了一种利用半天球格网点模型削弱测站多路径误差影响的新方法MHGM（multi-point hemispherical grid model）。该方法对以测站为球心的半天球进行格网点划分，通过格网点的参数化描述，实现测站处多路径误差建模，可适用于现有各类GPS数据处理的软硬件设备和观测环境。本文算例的测试结果表明，采用新方法建模后双差观测值残差的RMS均值改善率平均在73.9%左右，较传统恒星日滤波方法的改善效果平均可提升26.9%，对于静态观测数据，按实时动态相对定位处理模式可获得平面精度约1.7 mm，高程精度约3.0 mm的定位结果。此外，MHGM模型还可进一步用于对测站周边可能存在的多路径误差源进行方位评估，对从物理意义上消除多路径误差源的影响给出一定的指导性意见。

关键词: 多路径误差, 恒星日滤波, 半天球, 格网点建模, 环境反演

Abstract: Multipath effect is related to the observational environment of stations, and cannot be eliminated or mitigated by differential algorithm. It is a major factor affecting accuracy and reliability in GPS signal processing. This paper proposes a method to mitigate the multipath effect—MHGM (Multi-point Hemispherical Grid Model). The method divides the hemisphere centered on each station into a grid, and estimates the multipath error at the station based on parametrization of the grid points, which can be applied to different kinds of hardware and software system of GPS data processing and observation environment. The experimental results in this paper show that, MHGM multipath error modeling based on data from observations made improvements in the mean RMS of double-differenced observation residuals averaging about 71.3%, an average increase of 26.9% compared with the traditional sidereal filtering method, the positioning results of 1.7 mm in level and 3.0 mm in altitude are obtained for static observation using real-time kinematic relative positioning mode. MHGM proposed in this paper also can used to assess orientation of error sources around the station, giving guidance which may assist in the physical elimination of sources of multipath error.

Key words: multipath error, sidereal filter, hemisphere, grid model, environmental reconstruction

中图分类号:

P228.4

王亚伟, 邹璇, 唐卫明, 崔健慧, 李洋洋. 削弱GNSS多路径效应的半天球格网点建模方法[J]. 测绘学报, 2020, 49(4): 461-468.

WANG Yawei, ZOU Xuan, TANG Weiming, CUI Jianhui, LI Yangyang. A method for mitigating GNSS multipath effect based on multi-point hemispherical grid model[J]. Acta Geodaetica et Cartographica Sinica, 2020, 49(4): 461-468.

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削弱GNSS多路径效应的半天球格网点建模方法

A method for mitigating GNSS multipath effect based on multi-point hemispherical grid model

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