同震地表位移的单站时间基线模型解算  

Co-seismic ground displacement resolving based on a time baseline positioning model using single receiver

作　　者：李艳辉 周乐韬 冯威 黄丁发 LI Yanhui;ZHOU Letao;FENG Wei;HUANG Dingfa(Faculty of Geosciences and Environment Engineering, Southwest Jiaotong University, Chengdu 611756, China)

机构地区：[1]西南交通大学地球科学与环境工程学院,成都611756

出　　处：《测绘科学》2018年第6期88-92,共5页Science of Surveying and Mapping

基　　金：国家自然科学基金项目(41104020;41374032);四川省应急测绘与防灾减灾工程技术研究中心开放基金项目(K2015B004)

摘　　要：针对强震时GPS双差相对定位精度受参考站位移的影响,而精密单点定位数据处理过程又相对复杂等问题,该文采用单站时间基线模型解算实时同震地表位移。依据短时间内对流层延迟等误差强相关和模糊度固定不变的特性,利用消电离层星间单差观测值,并对卫星钟差进行改正,建立时间基线差分解算模型。实验结果表明,本文方法所得测站位移结果与SOPAC解的互差的均方根误差在N、E、U这3个方向上分别为5.4、4.1和12.2mm,基于单站的处理方法,该文所得结果比SOPAC解更准确地反映地震期间地表运动。Aiming at the problem that the GPS double-differenced relative positioning accuracy was affected by the displacement of the reference station and the precise point positioning data processing was complex during strong earthquake,so this paper adopted a method to resolve the real-time instantaneous ground displacement of GPS stations during earthquake based on a time baseline positioning model using single receiver.Depending on the strong correlation of tropospheric delay in short time as well as ambiguity fixing,this paper established a time baseline positioning model with the ionosphere-free satellite single difference model and the satellite clock error corrected.The experimental results showed that the root mean square error of ground displacement of N,Eand Ufrom time baseline positioning model solutions mutual difference with SOPAC solutions could reach 5.4,4.1 and 12.2 mm,so based on the single receiver processing method,the results obtained in this paper could reflect ground motion during earthquake more accurately than SOPAC solutions.

关 键 词：高频GPS数据 星间单差 卫星钟差 单站时间基线模型 同震地表位移 

分 类 号：P228[天文地球—大地测量学与测量工程]