摘要
北斗全球卫星导航系统在实现基本导航服务的基础上,还将为中国及其周边地区提供星基增强的服务模式。北斗全球系统在GEO卫星下行频点BDSBAS-B1C和BDSBAS-B2a分别播发RTCA DO-229D协议和DFMC-SBAS协议的星基增强信息。根据SBAS接口协议文件,北斗全球系统GEO卫星可在BDSBAS-B1C和BDSBAS-B2a两个频点与GPS卫星实现无系统偏差的联合增强定位,这将一定程度上改善BDSBAS系统GPS用户的区域PDOP值。从数据完整率、载噪比和多路径误差三个角度对北斗全球系统GEO-1卫星在频点BDSBAS-B1C和BDSBAS-B2a上的信号质量进行评估,并分别与GPS卫星在L1CA和L5频点上完成对比分析,结果表明:GEO-1卫星在中国区域的SBAS信号质量优于GPS卫星。
In addition to basic navigation service,Beidou-3 satellite navigation system will also provide Satellite-Based Augmentation Service(SBAS)in China and its surrounding ar-eas.Relying on BDSBAS-B1C and BDSBAS-B2a channel of GEO satellite,SBAS messages of RTCA DO-229D and DFMC-SBAS are respectively broadcast.According to SBAS Inter-face Control Document(ICD),on BDSBAS-B1C and BDSBAS-B2a channel,Beidou-3 GEO satellite can realize joint augmentation positioning with GPS satellites without systematic deviation,which will to some degree improve the PDOP of BDSBAS GPS users.In this pa-per,signal quality of Beidou-3 GEO-1 satellite on BDSBAS-B1C and BDSBAS-B2a channel is evaluated from three aspects―data integrity ratio,carrier-to-noise ratio and multipath error.The comparisons with GPS satellites respectively on L1CA and L5 channel are also completed.The results show that the signal quality of Beidou-3 GEO-1 satellite in China is better than that of GPS satellites.
作者
蒲俊宇
李晓杰
郭睿
唐成盼
王梦兰
PU Jun-yu;LI Xiao-jie;GUO Rui;TANG Cheng-pan;WANG Meng-lan(32021 Troop,Beijing 100094,China;Shanghai Astronomical Observatory,Chinese Academy of Sciences,Shanghai 200030,China)
出处
《天文学进展》
CSCD
北大核心
2020年第4期448-456,共9页
Progress In Astronomy
基金
国家自然科学基金(41874043,41704037)。
