罗兰C与GNSS组合定位系统误差校正方法的研究  

The study of systematic error calibration method for Loran-C and GNSS integrated positioning

作　　者：刘音华[1,2] 李孝辉 刘长虹[1] 赵凡 朱峰[1] 冯平 LIU Yin-hua;LI Xiao-hui;LIU Chang-hong;ZHAO Fan;ZHU Feng;FENG Ping(National Time Service Center,Chinese Academy of Sciences,Xi’an 710600,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院国家授时中心,西安710600 [2]中国科学院大学,北京100049

出　　处：《时间频率学报》2021年第4期322-330,共9页Journal of Time and Frequency

基　　金：“十三五”国家重大科技基础设施资助项目(2018777)。

摘　　要：GNSS(Global Navigation Satellite System)导航系统容易受电磁干扰,且易受遮挡,在复杂电磁环境和遮挡环境中的应用受限。罗兰C系统是陆基无线电导航系统,具有发射功率大、抗电磁干扰强等优势,可以把罗兰C发播台当作GNSS系统的伪卫星来进行组合定位,能大大提高导航系统的可用性和可靠性。本文从理论上分析了影响组合定位性能的因素,并提出了校正—融合的组合定位算法用以修正罗兰C系统误差,并基于实测数据研究分析了北斗和罗兰C组合定位性能。研究结果表明,基于蒲城罗兰发播台,在4~8颗可用卫星资源的情况下,采用本文提出的组合定位算法,可以达到数十米至百米量级的定位精度;北斗和罗兰C组合定位能大大优化几何精度因子;在北斗单系统GDOP值越大时,组合定位精度的改善程度也越大;在GDOP小于30的情况下,组合定位性能和北斗单系统相当。The application of Global Navigation Satellite System(GNSS) is limited in some complicated electromagnetism environment as it may be disturbed and blocked off easily. Long Range Navigation System(Loran-C) is a kind of terrestrial radio navigation system, which has the advantages of great transmitting power and strong ability of anti electromagnetic interference. Loran-C terrestrial transmitting station can be considered as a pseudo-satellite. Thus, GNSS and Loran-C can be integrated to realize positioning, it can improve the performance of navigation systems in complicated electromagnetism environment and also can realize positioning in single system blind area. In this study, the influence factors of integrated positioning were analyzed firstly, and the positioning algorithm based on calibration and fusion was presented to correct the systematic error of Loran-C data. Then, the performance of integrated positioning was analyzed based on the data collected from Beidou Navigation Satellite System(BDS) and Loran-C receivers. The positioning result of integrated systems was compared with the single BDS. Finally, the effect of integrated systems on geometric dilution of precision(GDOP) was studied. The results shown that based on the Pucheng Loran station, the positioning accuracy of tens or hundreds of meters can be achieved while used the proposed integration algorithm. The GDOP was improved greatly by the BDS and Loran-C systems integration;the improving effect of positioning accuracy was more obvious while the value of GDOP was greater, the performance of integrated positioning was in the same order of magnitude as BDS positioning while the GDOP value was smaller than 30.

关 键 词：全球卫星导航系统 LORAN-C 组合定位 精度因子 系统误差校正 

分 类 号：P127.1[天文地球—天体测量]