电离层对超长GNSS基线共视影响分析  

Analyse the Influence of Ionosphere on Ultralong GNSS Baseline Co-vision

作　　者：林全东 LIN Quandong(Fuzhou Survey Institute,Fuzhou Fujian 350003,China)

机构地区：[1]福州市勘测院,福建福州350003

出　　处：《北京测绘》2020年第12期1819-1824,共6页Beijing Surveying and Mapping

摘　　要：针对电离层对远距离全球定位系统(GPS)共视实时时间比对的影响,本文设计了三种电离层延迟减弱措施,分析不同电离层模型对GPS基线长度在100~3000 km节点的时间同步影响特征,并从实时性同步要求分析各种方法的优缺点,提出了一种适用于实时时间比对的方法,基于实测数据统计分析表明,该方法针对3000 km基线,同步精度可以达到2.5 ns。Aims at the effect of ionosphere to long-range GPS co-view real-time comparison,this paper designed three different ionospheric delay weakening measures to analyze the influence characteristics of different ionospheric models on the time synchronization of GPS baseline length at 100~3000 km nodes.The advantages and disadvantages of various methods are analyzed from the requirement of real-time synchronization and a method suitable for real-time time comparison is proposed.Based on the statistical analysis of measured data,the synchronization accuracy can reach 2.5 ns for 3000 km baseline.

关 键 词：远距离GPS共视 实时性 时间同步 同步精度 

分 类 号：P228.4[天文地球—大地测量学与测量工程]