北斗卫星导航系统海拔依赖性伪距变化特性分析

Analysis of Altitude-Dependent Pseudorange Variation Characteristics of Beidou Satellite Navigation System

为了验证第三代北斗系统的新设计和新技术,该研究以北斗-2卫星上常见的三种新型民用信号为研究对象,利用不同类型的接收器在不同位置采集的观测数据,研究了这三种新型民用信号在编码测量中海拔依赖系统偏差的特征。结果表明,新型民用信号B1C多径组合残差的均方根值大于B2a和B2b信号的均方根值,这表明B1C往往比B2a和B2b更受多径效应的影响;此外基于配备全视图天线的不同接收器,北斗-3在轨验证卫星的传统B1C,B2a和B2b频段不存在海拔依赖性的伪距偏差。

In order to verify the new design and new technology of the third generation Beidou system,this study takes three kinds of new civil signals commonly used in Beidou-2 satellite as research objects,and uses different types of receivers to collect ob⁃servation data at different locations.These three new types of civilian signals are characterized by altitude-dependent system devia⁃tions in coding measurements.The results show that the rms value of the new civil signal B1C multipath combination residual is larg⁃er than the rms value of B2a and B2b signals,which indicates that B1C is often more affected by multipath effect than B2a and B2b.Different receivers,the Beidou-3 in-orbit verification satellites have no elevation-dependent pseudorange deviations in the tradi⁃tional B1C,B2a and B2b bands.