一种基于多频模糊度快速解算方法的BDS/GPS中长基线RTK定位模型  

A Method of BDS/GPS RTK Positioning Based on MCAR Algorithm for Medium-baseline

作　　者：谢建涛 郝金明[1] 刘伟平[1] 于合理[1] 田英国[1] XIE Jiantao HAO Jinming LIU Weiping YU Heli TIAN Yingguo(Institute of Navigation and Space Target Engineering, Information Engineering University, Zhengzhou 450050, China)

机构地区：[1]信息工程大学导航与空天目标工程学院,河南郑州450050

出　　处：《武汉大学学报（信息科学版）》2017年第9期1216-1222,共7页Geomatics and Information Science of Wuhan University

摘　　要：随着全球卫星导航系统(global navigation satellite system,GNSS)进入多系统时代,空中导航卫星的可见卫星数不断增加,中国北斗卫星导航系统(BeiDou navigation satellite system,BDS)已开始面向用户提供三频导航信号,这都有利于改善单历元实时动态定位(real-time kinematic,RTK)的精度和可靠性。中长基线单历元RTK通常采用电离层无关组合算法,但是该方法将观测噪声进行了放大,模糊度固定成功率随着基线长度的增加而明显降低。提出一种BDS/GPS(global positioning system)中长基线单历元多频RTK定位算法,先以较高成功率快速固定BDS的两个超宽巷模糊度,继而通过简单变换得到BDS宽巷模糊度,然后将其辅助提高GPS宽巷模糊度固定成功率,最后采用将电离层延迟误差参数化的策略以提高BDS/GPS窄巷模糊度固定成功率。结合实测数据进行验证分析,结果表明本文算法是可行的。The number of visible satellites is increasing in the age of multiple global navigation systems. The global navigation satellite system （GNSS） , and Chinese BeiDou satellite navigation system （BDS） offer three frequencies signals to users, the ambiguity resolution is improved the higher accuracy and reliability of GNSS-RTK positioning . In general, ionosphere-free combinations are used in single-epoch RTK（Real-Time Kinematic）for medium-baseline. But this algorithm amplifies the measurement noise and the ambiguity resolution performance deteriorates as the length of baseline increases. In this paper, a single-epoch and multi-frequency RTK positioning algorithm for medium-baseline is presented, based on the BDS/GPS dual system combination. Two BDS extra-wide lane ambiguities were fixed at a high success rate and the BDS wide-lane ambiguity was sloved through a simple trans- formation. Ambiguity-fixed WL was used to improve the success rate of GPS WL ambiguity fixing, and parameterization strategy of ionospheric delay error was used to improve the success rate of BDS/ GPS NL ambiguity fixing. This algorithm was validated with real-time data. The results show that the proposed algorithm ia feasible for ambiguity resolution and positioning accuracy.

关 键 词：BDS/GPS 三频模糊度算法 多频RTK 模糊度解算 

分 类 号：P228[天文地球—大地测量学与测量工程]