| 摘要: |
| 针对传统伪距-相位组合中伪距噪声过大的问题引入了多普勒观测值进行辅助，同时再联合无几何相位组合构成一种新的周跳探测与修复方法。在信号方面，选择B2a代替B2I，与B1I、B3I组成了“北斗”卫星导航系统（Beidou Navigation Satellite System，BDS）中定位性能更好的“北斗”三频观测组合。在选频方面，选用无几何相位系数\[-1,1,0\]、多普勒辅助伪距-相位系数\[1,0,-1\]，\[1,3,-4\]组合进行周跳的探测。在修复方面，使用搜索法进行周跳的修复，并根据1-范数原则确保修复值的准确性。在1 s的采样率、电离层延迟稳定情况下，所提方法不仅能探测与修复出所有加入的1周在内的周跳，而且相比传统伪距-相位方法在小周跳探测方面性能更佳。 |
| 关键词: “北斗”卫星导航系统（BDS） 周跳探测 伪距-相位法 多普勒观测值 无几何相位法 |
| DOI：10.20079/j.issn.1001-893x.220321002 |
|
| 基金项目:国家自然科学基金资助项目（61563004） |
|
| A method for detecting and repairing triple-frequency cycle slips of Beidou navigation satellite system |
| WANG Jingjun,XIONG Zekai,LAO Yuanji,QIN Tuanfa |
| (a.School of Computer and Electronic Information;b.Guangxi Key Laboratory of Multimedia Communications and Network Technology,Guangxi University,Nanning 530004,China) |
| Abstract: |
| Doppler observations are introduced to resolve the problem of the excessive values of pseudorange noise in the traditional pseudorange-phase combination.Besides,the proposed cycle-slip detection and repair method is combined with the geometry-free phase combination.In terms of signal selection,B2a that is selected instead of B2I,together with B1I and B3I,forms a three-frequency observation combination with better performance in the Beidou Navigation Satellite System(BDS).In terms of frequency selection,the combination of geometry-free phase coefficients\[-1,1,0\]and Doppler-assisted pseudorange-phase coefficients\[1,0,-1\],\[1,3,-4\]is used to detect cycle slips.For repairing cycle slips,the search method is used and the 1-norm principle is suggested to ensure the accuracy of repaired values.When the sampling interval is 1 s and the ionospheric delay is stable,the proposed scheme can not only detect and repair all cycle slips occurred in one cycle,but also get better performance compared with the traditional pseudorange-phase scheme in the detection of small cycle slips. |
| Key words: Beidou navigation satellite system(BDS) cycle slip detection pseudorange-phase method Doppler observations geometric phase-free method |
《电讯技术》编辑部 