顾及电离层延迟的BDS-3四频长基线定位算法  

BDS-3 quad-frequency long baseline positioning algorithm considering ionospheric delay

作　　者：吕震 王振杰[1] 刘金萍 翟建朋 周浩 LüZhen;WANG Zhenjie;LIU Jinping;ZHAI Jianpeng;ZHOU Hao(College of Oceanography and Space Informatics,China University of Petroleum(East China),Qingdao 266580,China;Shengli Branch,Sinopec Geophysical Co.,Ltd.,Dongying 257100,China;Qingdao Beidou Land-sea Technology Co.,Ltd.,Qingdao 266555,China)

机构地区：[1]中国石油大学(华东)海洋与空间信息学院,山东青岛266580 [2]中石化石油工程地球物理有限公司胜利分公司,山东东营257100 [3]青岛北斗陆海科技有限公司,山东青岛266555

出　　处：《测绘通报》2023年第4期71-74,75-78,共8页Bulletin of Surveying and Mapping

基　　金：中国石化集团公司科技攻关项目(JP210004)。

摘　　要：针对长基线定位中电离层延迟对定位精度造成的影响,本文提出了一种基于BDS-3四频信号(B1C/B1I/B2a/B3I)的四频消电离层(IF)组合方法,采用消电离层组合观测值消除电离层延迟误差,联合模糊度改正后的超宽巷或宽巷组合观测值构建定位方程,从而实现原始窄巷模糊度和基线位置坐标的解算。试验采用BDS-3四频数据对四频IF组合方法和基于GB-FCAR模型的电离层延迟参数估计方法的定位精度进行对比分析。结果表明,在对长度超过500 km的长基线进行定位解算时,四频IF组合方法可以实现电离层延迟误差消除。与电离层延迟参数估计方法相比,四频IF组合方法水平和垂直方向的定位精度均达分米级,提升幅度分别达35%和40%以上,定位精度显著提高,其相对定位精度可达1×10^(-9)m,满足长基线相对定位的要求。Considering that ionospheric delay in long baseline positioning can affect the positioning accuracy,this paper proposes a quad-frequency ionosphere-free(IF)combination method based on BDS-3 four-frequency signals(B1C/B1I/B2a/B3I),which eliminates the ionospheric delay error by using the combined ionosphere-freeobservations and constructs the positioning equation by combining the ambiguity-corrected extra-wide-lane or wide-lane combination observations,so as to estimatethe raw narrow-lane ambiguity and baseline coordinates.The experiments are conducted to compare the positioning accuracy of quad-frequency IF combination method and ionospheric delay parameter estimation method based on GB-FCAR modelusing BDS-3 quad-frequency data.The results show that when long baseline is over 500 km,the quad-frequency IF combination method can eliminate ionospheric delay error.Compared with the ionospheric delay parameter estimation method,the positioning accuracy of the quad-frequency IF combination method can reach the decimeter level in both horizontal and vertical directions,the improvement can reach more than 35%and 40%respectively,which significantly improves the positioning accuracy.The relative positioning accuracy can reach 1×10^(-9) m,which meets the relative positioning requirements of long baselines.

关 键 词：BDS-3 四频 长基线 参数估计 消电离层组合 

分 类 号：P228[天文地球—大地测量学与测量工程]