基于BDS-3的三频改进动对动模糊度解算方法
Triple-frequency improved kinematic-to-kinematic ambiguity resolution method based on BDS-3
李瑶 1赵科东 1孙永荣 1付希禹1
作者信息
- 1. 直升机动力学全国重点实验室/南京航空航天大学 自动化学院,南京 211100
- 折叠
摘要
针对传统三频整周模糊度解算方法(TCAR)中,动态环境下整周模糊度固定成功率较低,以及无几何模型无法充分利用可见卫星观测信息的问题,提出 1 种三频改进动对动模糊度解算方法:以北斗三号全球卫星导航系统(BDS-3)三频观测值为基础,选取 2 组超宽巷组合观测值,无几何模型下解算其整周模糊度;然后通过线性组合的方式获得宽巷模糊度;最后利用宽巷距离量的约束,采用几何模型解算窄巷模糊度,从而还原初始双差模糊度.实验结果表明:采用双超宽巷线性组合的方法获得宽巷模糊度可降低动态场景中噪声的影响,大幅提升宽巷与窄巷模糊度固定成功率,且将传统 TCAR 方法与几何模型相结合,可有效提升可见卫星观测信息的利用率,窄巷模糊度固定成功率可达到 90%以上,最终实现厘米级相对定位.
Abstract
Aiming at the problems of low fixing success ratio of the integer ambiguity under kinematic environment and the inability of geometry-free model to fully utilize the visible satellite observation information in the traditional three carrier ambiguity resolution(TCAR),the paper proposed a triple-frequency improved kinematic-to-kinematic ambiguity resolution method:based on the triple-frequency observations of BeiDou-3 global navigation satellite system(BDS-3),two sets of extra-wide-lane combined observations were selected,and their integer ambiguities were solved under the geometry-free model;then,the wide-lane ambiguities were obtained by linear combination;finally,using the constraints of the wide-lane distance,the narrow-lane ambiguities were solved under the geometry-based model,so as to restore the initial double-difference ambiguities.Experimental results showed that the method of obtaining the wide-lane ambiguity by using the linear combination of double extra-wide-lane could reduce the influence of the noise in the kinematic environment and significantly improve the fixing success ratio of wide-lane and narrow-lane ambiguity,the combination of the traditional TCAR with the geometry-based model could effectively improve the utilization ratio of the visible satellite observation information,and the fixing success ratio of narrow-lane ambiguity would reach more than 90%,and eventually realize the centimeter-level relative positioning.
关键词
北斗三号全球卫星导航系统(BDS-3)/三频组合/双超宽巷/几何模型/模糊度解算Key words
BeiDou-3 global navigation satellite system(BDS-3)/triple-frequency combination/double extra-wide-lane/geometry-based model/ambiguity resolution引用本文复制引用
出版年
2024
NETL
NSTL
万方数据