不同电离层投影函数对中纬度地区单频接收机定位精度的影响  

Impact of Different Ionospheric Mapping Functions on the Positioning Accuracy of Single-frequency Receivers in Mid-latitude Regions

作　　者：张铁红 刘伟 刘述春 ZHANG Tiehong;LIU Wei;LIU Shuchun(Geological and Geographic Information Institute of Hunan Province,Changsha 410008,China)

机构地区：[1]湖南省地质地理信息所,湖南长沙410008

出　　处：《城市勘测》2022年第4期100-104,共5页Urban Geotechnical Investigation & Surveying

摘　　要：电离层延迟是全球导航卫星系统的重要延迟之一,并制约单频接收机的定位精度。其中,电离层投影函数是影响单频接收机定位精度的因素之一。本文使用3种电离层投影函数,即:标准单层电离层投影函数、Klobuchar投影函数及改进单层电离层投影函数,将全球电离层格网产品提供的垂直路径电离层延迟转换成倾斜路径电离层延迟,并评估利用转换得到的倾斜路径电离层延迟的单频精密单点定位精度。结果表明:在不同太阳活动期,不同电离层投影函数在北半球的SF-PPP结果要优于南半球的SF-PPP结果。Ionospheric delay is one of the main error sources for Global Navigation Satellite System(GNSS),which will influence the positioning accuracy of single-frequency receiver.Especially,the ionosphericmapping function is one of the factors that affect the positioning accuracy of single frequency receiver.Therefore,this paper assessed the accuracy ofSingle Frequency Precise Point Positioning accuracy(SF-PPP)corrected by the vertical ionospheric delay obtained from Global Ionosphere Maps(GIMs)converting from three ionosphericmapping functions.The mapping functions includes:Standard single-layer ionosphericmapping function(SLM-MF),Klobucharmapping function(Klobuchar-MF)and modified single-layer ionosphericmapping function(MSLM-MF).The results are listed as follows.either on solar quiet days or solar active days,the positioning results over the norththermhemesphere is better than that over the southern hemesphere.

关 键 词：电离层 投影函数 单频接收机 标准单点定位 单频精密单点定位 

分 类 号：P228[天文地球—大地测量学与测量工程]