针对北斗三号(BeiDou-3 Navigation Satellite System,BDS-3)PPP-B2b信号精密单点定位(precise point positioning,PPP)服务可用性,以改正参数的可用性比例、平均可用卫星数和改正参数匹配性为指标进行了系统分析.结果表明:在中国及周...针对北斗三号(BeiDou-3 Navigation Satellite System,BDS-3)PPP-B2b信号精密单点定位(precise point positioning,PPP)服务可用性,以改正参数的可用性比例、平均可用卫星数和改正参数匹配性为指标进行了系统分析.结果表明:在中国及周边地区,BDS-3 PPP-B2b信号改正参数的可用性在71%~95%,且在北京地区达到最大,GPS改正参数可用性在68.5%~88.6%,差于BDS-3.中国及周边地区用户缺少PPP-B2b信号改正参数的卫星观测弧段主要集中在低高度角时段,其改正参数的可用性随着截止高度角的增大而增大;BDS-3、GPS和BDS-3/GPS在中国及周边地区的改正数可用平均卫星数分别约为8颗、7颗和15颗,可以确保有效的实时PPP(real time PPP,RT-PPP)服务性能,但平均约有1颗BDS-3卫星和2颗GPS卫星因为缺少PPP-B2b信号改正参数而无法参与RT-PPP服务;对于赤道以南地区,单个系统基本无法提供有效的PPPB2b服务,其改正参数的平均可用性低于50%,但BDS-3/GPS双系统在部分低纬度地区可提供约7~11颗的可用卫星;由于轨道改正参数和钟差改正参数更新频率不一致,在钟差改正数版本号(IOD Corr)参数更新时,会出现短暂的改正参数不匹配情况.展开更多
Cross-calibration of high energetic particle data is a primary requirement for the availability of multi-instrument, multi-spacecraft data. II also can provide a method to verify relative reliability of data from sing...Cross-calibration of high energetic particle data is a primary requirement for the availability of multi-instrument, multi-spacecraft data. II also can provide a method to verify relative reliability of data from single satellite measurement. This pa- per presents a case study of energetic particles data cross-calibration between FY-3B and NOAA-17. A generally good agree- ment is acquired in the flux values and distribution trend of 2.5-6.9 MeV protons and 0.3-1.1 MeV electrons between FY-3B and NOAA-17 satellites. It suggests that the data observed by FY-3B is properly cross-calibrated. We can also confirm that energetic particles data observed by FY-3B satellite is available.展开更多
文摘针对北斗三号(BeiDou-3 Navigation Satellite System,BDS-3)PPP-B2b信号精密单点定位(precise point positioning,PPP)服务可用性,以改正参数的可用性比例、平均可用卫星数和改正参数匹配性为指标进行了系统分析.结果表明:在中国及周边地区,BDS-3 PPP-B2b信号改正参数的可用性在71%~95%,且在北京地区达到最大,GPS改正参数可用性在68.5%~88.6%,差于BDS-3.中国及周边地区用户缺少PPP-B2b信号改正参数的卫星观测弧段主要集中在低高度角时段,其改正参数的可用性随着截止高度角的增大而增大;BDS-3、GPS和BDS-3/GPS在中国及周边地区的改正数可用平均卫星数分别约为8颗、7颗和15颗,可以确保有效的实时PPP(real time PPP,RT-PPP)服务性能,但平均约有1颗BDS-3卫星和2颗GPS卫星因为缺少PPP-B2b信号改正参数而无法参与RT-PPP服务;对于赤道以南地区,单个系统基本无法提供有效的PPPB2b服务,其改正参数的平均可用性低于50%,但BDS-3/GPS双系统在部分低纬度地区可提供约7~11颗的可用卫星;由于轨道改正参数和钟差改正参数更新频率不一致,在钟差改正数版本号(IOD Corr)参数更新时,会出现短暂的改正参数不匹配情况.
基金supported by the National Natural Science Foundation of China(Grant No.41204119)
文摘Cross-calibration of high energetic particle data is a primary requirement for the availability of multi-instrument, multi-spacecraft data. II also can provide a method to verify relative reliability of data from single satellite measurement. This pa- per presents a case study of energetic particles data cross-calibration between FY-3B and NOAA-17. A generally good agree- ment is acquired in the flux values and distribution trend of 2.5-6.9 MeV protons and 0.3-1.1 MeV electrons between FY-3B and NOAA-17 satellites. It suggests that the data observed by FY-3B is properly cross-calibrated. We can also confirm that energetic particles data observed by FY-3B satellite is available.
