哨兵(Sentinel)-6A海洋测高卫星搭载了GPS/Galileo双模接收机,为研究基于全球导航卫星系统多星座的低轨卫星精密定轨提供了契机。固定载波相位模糊度可提升低轨卫星的定轨精度,利用在轨实测数据研究GPS/Galileo双系统组合以及模糊度固...哨兵(Sentinel)-6A海洋测高卫星搭载了GPS/Galileo双模接收机,为研究基于全球导航卫星系统多星座的低轨卫星精密定轨提供了契机。固定载波相位模糊度可提升低轨卫星的定轨精度,利用在轨实测数据研究GPS/Galileo双系统组合以及模糊度固定对低轨卫星运动学定轨精度的影响。分别采用欧洲定轨中心(Center for Orbit Determination in Europe,CODE)、法国国家空间研究中心(Centre National d’Etudes Spatiales,CNES)、德国地学研究中心(German Research Centre for Geosciences,GFZ)和中国武汉大学(Wuhan University,WHU)发布的观测值偏差及对应的精密星历和钟差产品开展单接收机模糊度固定。结果表明:GPS/Galileo双系统组合可明显改善定轨几何构型。双系统组合浮点解轨道三维精度优于30 mm,相对于GPS单系统提升超过20%。模糊度固定显著提升了运动学定轨精度,组合固定解轨道精度优于20 mm,相对于GPS提升30%。基于CODE、CNES和GFZ产品的GPS和Galileo单系统模糊度固定率分别优于93%和95%,WHU产品的Galileo固定率则偏低。利用卫星激光测距(satellite laser ranging,SLR)观测数据对运动学定轨结果进行检核,单系统固定解轨道SLR残差均方根误差(root mean square,RMS)为13~15 mm,双系统组合固定解RMS则达到12~14 mm,提升超过10%。展开更多
The continuously available satellites of European Galileo currently reach more than 25.To explore the rationality and reliability of the L-band and satellite laser ranging(SLR)data processing strategies,we design the ...The continuously available satellites of European Galileo currently reach more than 25.To explore the rationality and reliability of the L-band and satellite laser ranging(SLR)data processing strategies,we design the Galileo L-band,the SLR-only,and the combined L-band/SLR dynamic precise orbit determination(POD)strategies by using the normal equations(NEQs)stacking,and investigate their continuity and stability by employing the Galileo L-band data and SLR observations for the time span of the whole year of 2023,based on the Bei Dou/GNSS analysis center platform of Shandong University by using the modified Bernese GNSS Software Version 5.4.The orbital consistency of the L-band 1-day solution is the best with the Three-dimensional Root-Mean-Square(3D-RMS)values of 3.6 cm compared with the Center for Orbit Determination in Europe Multi-GNSS Experiment(COM)orbits,the corresponding values is 1.4 cm,2.5 cm,and 2.3 cm in Radial,the Tangential,and the Normal(RTN)direction,respectively.While the SLR-only 9-day arc length is optimal with the RTN values of 5.3 cm,30 cm,and 38.2 cm,as well as the 3D-RMS values of 48.9 cm.Encouragingly,the difference of the orbital accuracy between the combined L-band/SLR multi-day solution and the COM orbits is reduced by 0.5 cm and 0.9 cm,0.6 cm and 1.2 cm in T-,and N-direction for the 3-and 5-day solution respectively.The corresponding values improve 0.7 cm and 0.9 cm,1.4 cm and 1.8 cm for the 3-and 5-day orbital overlaps difference between the combined L-band/SLR and the L-band solution.Take the E09 satellite as a case study,the SLR-only orbital accuracy is regularly optimized as the multi-day arc lengthens and with the sites increase.Furthermore,the SLR residuals of its three types of orbits further demonstrate the positive contribution of SLR to the combination of the GNSS and SLR techniques.展开更多
随着中国BeiDou系统与欧盟Galileo系统的出现以及俄罗斯GLONASS系统的恢复完善,过去单一的GPS导航卫星系统时代已经逐步过渡为多系统并存且相互兼容的全球性卫星导航系统（multi-constellation global navigation satellite systems,mul...随着中国BeiDou系统与欧盟Galileo系统的出现以及俄罗斯GLONASS系统的恢复完善,过去单一的GPS导航卫星系统时代已经逐步过渡为多系统并存且相互兼容的全球性卫星导航系统（multi-constellation global navigation satellite systems,multi-GNSS）时代,多系统GNSS融合精密定位将成为未来GNSS精密定位技术的发展趋势。本文采用GPS、GLONASS、BeiDou、Galileo 4大卫星导航定位系统融合的精密单点定位（precise point positioning,PPP）实测数据,初步研究并分析了4系统融合PPP的定位性能。试验结果表明：在单系统观测几何构型不理想的区域,多系统融合能显著提高PPP的定位精度和收敛速度。4大系统融合的PPP收敛速度相对于单GNSS可提高30%~50%,定位精度可提高10%~30%,特别是对高程方向的贡献更为明显。此外,在卫星截止高度角大于30°的观测环境下,单系统由于可见卫星数不足导致无法连续定位,而多系统融合仍然可以获得PPP定位结果,尤其是水平方向具有较高的定位精度。这对于山区、城市以及遮挡严重的区域具有非常重要的应用价值。展开更多
文摘哨兵(Sentinel)-6A海洋测高卫星搭载了GPS/Galileo双模接收机,为研究基于全球导航卫星系统多星座的低轨卫星精密定轨提供了契机。固定载波相位模糊度可提升低轨卫星的定轨精度,利用在轨实测数据研究GPS/Galileo双系统组合以及模糊度固定对低轨卫星运动学定轨精度的影响。分别采用欧洲定轨中心(Center for Orbit Determination in Europe,CODE)、法国国家空间研究中心(Centre National d’Etudes Spatiales,CNES)、德国地学研究中心(German Research Centre for Geosciences,GFZ)和中国武汉大学(Wuhan University,WHU)发布的观测值偏差及对应的精密星历和钟差产品开展单接收机模糊度固定。结果表明:GPS/Galileo双系统组合可明显改善定轨几何构型。双系统组合浮点解轨道三维精度优于30 mm,相对于GPS单系统提升超过20%。模糊度固定显著提升了运动学定轨精度,组合固定解轨道精度优于20 mm,相对于GPS提升30%。基于CODE、CNES和GFZ产品的GPS和Galileo单系统模糊度固定率分别优于93%和95%,WHU产品的Galileo固定率则偏低。利用卫星激光测距(satellite laser ranging,SLR)观测数据对运动学定轨结果进行检核,单系统固定解轨道SLR残差均方根误差(root mean square,RMS)为13~15 mm,双系统组合固定解RMS则达到12~14 mm,提升超过10%。
基金under the support of the National Natural Science Foundation of China(Grant No.42388102),ChinaYouth Fund of the Natural Science Foundation of Hebei Province(Grant No.D2023523003),China。
文摘The continuously available satellites of European Galileo currently reach more than 25.To explore the rationality and reliability of the L-band and satellite laser ranging(SLR)data processing strategies,we design the Galileo L-band,the SLR-only,and the combined L-band/SLR dynamic precise orbit determination(POD)strategies by using the normal equations(NEQs)stacking,and investigate their continuity and stability by employing the Galileo L-band data and SLR observations for the time span of the whole year of 2023,based on the Bei Dou/GNSS analysis center platform of Shandong University by using the modified Bernese GNSS Software Version 5.4.The orbital consistency of the L-band 1-day solution is the best with the Three-dimensional Root-Mean-Square(3D-RMS)values of 3.6 cm compared with the Center for Orbit Determination in Europe Multi-GNSS Experiment(COM)orbits,the corresponding values is 1.4 cm,2.5 cm,and 2.3 cm in Radial,the Tangential,and the Normal(RTN)direction,respectively.While the SLR-only 9-day arc length is optimal with the RTN values of 5.3 cm,30 cm,and 38.2 cm,as well as the 3D-RMS values of 48.9 cm.Encouragingly,the difference of the orbital accuracy between the combined L-band/SLR multi-day solution and the COM orbits is reduced by 0.5 cm and 0.9 cm,0.6 cm and 1.2 cm in T-,and N-direction for the 3-and 5-day solution respectively.The corresponding values improve 0.7 cm and 0.9 cm,1.4 cm and 1.8 cm for the 3-and 5-day orbital overlaps difference between the combined L-band/SLR and the L-band solution.Take the E09 satellite as a case study,the SLR-only orbital accuracy is regularly optimized as the multi-day arc lengthens and with the sites increase.Furthermore,the SLR residuals of its three types of orbits further demonstrate the positive contribution of SLR to the combination of the GNSS and SLR techniques.
文摘随着中国BeiDou系统与欧盟Galileo系统的出现以及俄罗斯GLONASS系统的恢复完善,过去单一的GPS导航卫星系统时代已经逐步过渡为多系统并存且相互兼容的全球性卫星导航系统（multi-constellation global navigation satellite systems,multi-GNSS）时代,多系统GNSS融合精密定位将成为未来GNSS精密定位技术的发展趋势。本文采用GPS、GLONASS、BeiDou、Galileo 4大卫星导航定位系统融合的精密单点定位（precise point positioning,PPP）实测数据,初步研究并分析了4系统融合PPP的定位性能。试验结果表明：在单系统观测几何构型不理想的区域,多系统融合能显著提高PPP的定位精度和收敛速度。4大系统融合的PPP收敛速度相对于单GNSS可提高30%~50%,定位精度可提高10%~30%,特别是对高程方向的贡献更为明显。此外,在卫星截止高度角大于30°的观测环境下,单系统由于可见卫星数不足导致无法连续定位,而多系统融合仍然可以获得PPP定位结果,尤其是水平方向具有较高的定位精度。这对于山区、城市以及遮挡严重的区域具有非常重要的应用价值。
