数据缺失情况下BDS定位性能分析  

BDS positioning performance analysis under missing data

作　　者：高天杭 崔先强 王勋[1] GAO Tianhang;CUI Xianqiang;WANG Xun(Central South University,Changsha 410083,China)

机构地区：[1]中南大学

出　　处：《测绘科学》2019年第12期102-108,共7页Science of Surveying and Mapping

基　　金：国家自然科学基金项目（41674012）

摘　　要：针对观测数据的缺失会影响数据处理效果、降低定位精度的问题,该文为了探明缺失数据是如何影响定位,进行静态定位实验分析3类卫星对定位误差的影响,进行动态定位实验测试了在缺失数据的真实情况下北斗卫星系统的定位性能。静态实验结果表明,在伪距单点定位中缺失GEO卫星时三维点位精度下降了85%,在缺失IGSO时定位精度下降了43.8%,缺失MEO卫星时定位精度下降了6%,在载波相位定位中缺失3类卫星数据对定位精度虽然也有影响,但不如伪距定位的影响大。在动态实验中发现在无遮挡的环境中,BDS定位精度不受影响,且定位精度较高,可与GPS相媲美;在遮挡的环境中,GPS和BDS都出现了信号质量下降的情况,BDS数据缺失比GPS严重,缺失严重时定位出现较大的误差,结果不可靠。The lack of observation data will affect the effect of data processing,reduce the accuracy of positioning,in order to find out how missing data affects positioning,the static positioning test is firstly carried out to analyze the influence of three types of satellites on the positioning error,and then the dynamic positioning test is carried out to test the positioning performance of the Beidou satellite system in the real situation of missing data.The static pseudorange single point positioning test results show that the accuracy of 3Dpoint accuracy is reduced by 85%in the absence of GEO satellites,43.8%in the absence of IGSO,and 6%in the absence of MEO satellites.The lack of three types of satellite data in carrier phase positioning has an impact on the positioning accuracy,but it is not as great as the pseudorange positioning In the kinematic experiment,it is found that in the unobstructed environment,the positioning accuracy of BDS is not affected,and the positioning accuracy is high,which is comparable to GPS,in the occluded environment,both GPS and BDS have a degraded signal quality.The BDS data is more serious than GPS.When the loss is serious,the positioning has a large error,and the result is unreliable.The innovation is to eliminate the different types of satellites of the BDS to verify the positioning characteristics of the missing satellites.

关 键 词：数据缺失 性能分析 北斗卫星系统 地球静止轨道卫星 动态定位 

分 类 号：P228[天文地球—大地测量学与测量工程]