基于双频伪距组合评估北斗广播电离层精度  

Precision Assessment of Broadcast Ionospheric Model of BDS Based on Double-frequency Pseudo-range Combination

作　　者：程娜[1] 贾小林[2] 

机构地区：[1]长安大学地质工程与测绘学院,西安710054 [2]西安测绘研究所,西安710054

出　　处：《导航定位学报》2015年第1期74-77,共4页Journal of Navigation and Positioning

摘　　要：电离层时延误差是影响全球卫星导航系统定位、导航、授时精度的主要因素之一,为了满足单频用户的需求,我国北斗系统采用Klobuchar 8参数模型进行电离层时延改正。在监测评估体系中,采用两种方法对电离层预报精度进行评估,1)全球卫星导航系统国际服务协会精密电离层模型评估;2)双频伪距组合评估。基于第二种方法对北斗系统的Klobuchar模型进行了评估。评估结果显示,北斗系统广播电离层模型绝对精度包括均方根及标准差都在1.0m以内;相对精度PER一般为50%左右。Ionospheric delay is one major factor which affecting GNSS positioning,navigation,timing（PNT）.In order to meet the needs of single-frequency users,the BDS provides the Klobuchar 8-parameters correction model in geographic coordinate system for ionospheric delay.In the monitoring and evaluation system,there are usually two methods to assess the broadcast Ionospheric model,1）assessment by IGS precise ionospheric;2）assessment by dual-frequency pseudo-orange combination.In this paper,the second method is used to assess the BDS＇s broadcast ionosphericmodel.The results show that RMS and STD of broadcast ionospheric model are in 1.0m,the relative precision is usually about 50%.

关 键 词：电离层时延 北斗系统 KLOBUCHAR模型 双频伪距组合 

分 类 号：P228[天文地球—大地测量学与测量工程]