GNSS接收机数据质量及常见问题分析

GNSS接收机数据质量是接收机实现各项功能、向用户提供各项服务的基础。针对当前GNSS数据质量核验方法和评价指标较为单一,分析方法不系统的问题,文中分析一种综合利用TEQC、GAMIT、RTKLIB三款软件进行GNSS数据质量分析的方法,并给出相应质量分析指标。以北京市全球卫星定位系统网络中基准站数据为基础,对北斗三模接收机和GPS/GLONASS双模接收机数据质量进行对比分析,对比结果显示,石景山和牛口峪两个站数据质量整体较差,mp1大于0.5m,mp2大于0.75m,周跳比小于2 000。对影响数据质量的原因进行初步分析,通过实地勘测验证理论分析结果,对比分析结果表明:采用文中提出的质量分析方法所判断出的问题同实地勘察结果一致,验证本方法的实用性。最后针对基准站存在的问题向相关部门提出改善建议,并对改善后该站观测数据进行质量分析,各项指标均达标。

Analysis of GNSS receiver data quality and common problems

GNSS receiver data quality is the basis for the various functions and services provided by the receiver.At present the checking method and the evaluation index of GNSS receiver data quality are more single,and the analysis method is not systematic.In view of these problems,this paper presents a method to analyze GNSS data quality by using TEQC,GAMIT and RTKLIB and the corresponding quality analysis indexes.Based on the data of base station in the global satellite positioning system network of Beijing,the data quality of the Beidou three-mode receiver and the GPS/GLONASS dual-mode receiver are compared and analyzed.T he result show s that the data quality of Shijingshan and Niukouyu station is overall poor,whose mp1is greater than 0.5 m,mp2 is greater than 0.75 m,and the ratio between observation and cycle slip is less than 2000.Then the influencing factors of the quality of the data are analyzed.The conclusion of the theoretical analysis is verified by the survey of actual situation.The result of comparative analysis between two receivers shows that the problem of the quality analysis method proposed in this paper is consistent with the result of survey of actual situation,so the practicability of the method is verified.At last,according to the problems of the base station,some suggestions for improvement are proposed to the relevant departments.Then all indexes of the data are standard.