BDS授时性能分析与接收机DCB估计  

Analysis of BDS timing performance and DCB estimation of receivers

作　　者：陈亮[1] 展昕 许磊[1] 张志新 CHEN Liang;ZHAN Xin;XU Lie;ZHANG Zhixin(The 54th Research Institute of China Electronics Technology Group Corporation,Shijiazhuang 050081,China;The 722th Research Institute of China Shipbuilding Industry Corporation,Wuhan 430205,China)

机构地区：[1]中国电子科技集团公司第五十四研究所,石家庄050081 [2]中国船舶重工集团公司第七二二研究所,武汉430205

出　　处：《导航定位学报》2023年第1期53-59,共7页Journal of Navigation and Positioning

摘　　要：为了进一步研究北斗卫星导航系统(BDS)的授时性能,对北斗三号(BDS-3)多模式授时性能进行分析,给出采用时间群延迟参数的授时处理方法:指出BDS-3播发的导航信号较北斗二号(BDS-2)增加了B1C、B2a和B2b等民用频点,去掉了性能较差的B2I,并在原有时间群延迟(TGD)参数的基础上增加了TGDB1Cp、TGDB2ap和TGDB2bI等参数,为导航用户提供新频点的延迟改正;然后提出一种特殊情况下的单站接收机差分码偏差(DCB)估计方法,采用连续60 d的观测数据进行BDS-3多模式授时分析。实验结果表明:单频授时精度(RMS)BDS-3较BDS-2提升约5 ns,单频模式受未消除电离层延迟影响严重;单频差分(电离层格网)模式较单频模式有较大改善,相同频点提高约4 ns;双频模式和三频模式表现最优,授时精度优于1ns;全部授时精度优于BDS-3公布的20ns;最后验证估计的接收机DCB在30 d内变化稳定,标准差(STD)不超过0.2 ns。In order to further study on the timing performance of BeiDou navigation satellite system(BDS),the paper analyzed the multi-mode time service of BDS-3,and gave the data processing method of the delay parameters of timing group:it was introduced that the navigation signals broadcast by BeiDou-3 navigation satellite system(BDS-3)have added civil frequency points such as B1C,B2a and B2b,and removed B2I due to its poor performance,compared with that by BeiDou-2 navigation satellite system(BDS-2),moreover,the timing group delay(TGD)parameters including TGDB1Cp,TGDB2ap,TGDB2bi and other parameters of the broadcast satellite equipment group provide delay correction for navigation users;then a receiver differential code bias(DCB)estimation method under special conditions was proposed,and the analysis on BDS-3 multi-mode timing performance was carried out with 60 consecutive days of measured data.Experimental result showed that:the root mean square(RMS)of single frequency timing of BDS-3 could be improved by about 5 ns compared with that of BDS-2,and the single frequency mode would be seriously affected by the uneliminated ionospheric delay;the single frequency difference(ionospheric grid)mode could be better than the single frequency mode,with about 4 ns higher than the single frequency at the same frequency point;meanwhile,dual frequency mode and tri frequency mode could be the best,and the standard deviation would be better than 1 ns;the overall timing accuracy could be better than 20 ns published by BDS-3;finally,the proposed receiver DCB estimation was tested and verified that the results could be relatively stable within 30 days,and the standard deviation would be not more than 0.2 ns.

关 键 词：北斗卫星导航系统(BDS) 授时 单频 双频 差分码偏差 

分 类 号：P228[天文地球—大地测量学与测量工程]