GNSS伪距随机模型估计的非差组合方法  

Stochastic Modeling for GNSS Pseudo-range Observations Using Undifferenced Geo-Ion-Free Combinations

作　　者：刘志平[1] 赵祥伟[1] 

机构地区：[1]中国矿业大学国土环境与灾害监测国家测绘地理信息局重点实验室,徐州市大学路1号221116

出　　处：《大地测量与地球动力学》2015年第1期100-105,共6页Journal of Geodesy and Geodynamics

基　　金：国家自然科学基金青年基金(41204011);大地测量与地球动力学国家重点实验室开放基金(SKLGED2014-3-2-E);江苏省高校优势学科建设工程(SZBF2011-6-B35)

摘　　要：基于非差观测值和无一阶电离层误差、无几何距离的组合准则导出2个UGIF组合,进而提出GNSS非差伪距随机模型估计的UGIF非差组合方法。该方法仅需单站、单颗卫星的UGIF组合,适用于高低频情况下的非差伪距随机模型的实时或事后估计。利用中国矿业大学单基站连续运行站双模双频数据,验证方法的正确性与有效性。Probability histograms of three quadruple difference series are extracted from 24 hours GPS observations of two IGS stations with 5Hz sampling rate based on this,it is pointed out that quadruple difference series are not nearly applicable for stochastic modeling due to requirements of high sampling rate,baseline length and probability distribution assumptions on different stations and satellites.Undifferenced combination observation using both geometry-free and ionospheric-free criteria（short for UGIF）is derived from dual-frequency observations,and then a stochastic modeling method for GNSS undifferenced pseudo-range observations is presented based on UGIF.The proposed method can estimate the stochastic model of a single station and satellite pseudo-range observations with high or low sampling rate in real-time or post-processing modes.Finally a case is implemented to test the validity and rationality of the UGIF method using dual-frequency GPS and GLONASS observations collected at CUMT＇s single reference station.

关 键 词：GNSS 非差伪距 随机模型 四差序列 UGIF组合 

分 类 号：P228.41[天文地球—大地测量学与测量工程]