为了分析当前GPS(Global Positioning System)、Galileo(Galileo Navigation Satellite System)和BDS-3(Beidou Navigation Satellite System with Global Coverage)广播星历的精度,详细分析研究了各种偏差改正及消除方法,并尽可能地消...为了分析当前GPS(Global Positioning System)、Galileo(Galileo Navigation Satellite System)和BDS-3(Beidou Navigation Satellite System with Global Coverage)广播星历的精度,详细分析研究了各种偏差改正及消除方法,并尽可能地消除了系统误差和粗差对评估结果的影响。选取2021-11-01/12-31共61天MGEX(multi-GNSS experiment)发布的多系统混合广播星历与武汉大学分析中心发布的事后精密星历数据进行实验,对GPS、Galileo和BDS-3近期广播星历精度进行对比分析,实验结果表明:3个系统广播星历整体精度由高到低依次是Galileo、BDS-3和GPS,其空间信号测距误差的RMS(root mean square)分别优于0.17、0.25和0.37 m,整体轨道精度的RMS分别优于0.17、0.12和0.25 m,BDS-3广播星历的轨道精度最高,钟差误差的RMS分别优于0.15、0.23和0.27 m,Galileo广播星历的钟差精度最高。对于GPS卫星的广播星历,blockⅢA卫星钟差和轨道精度均优于其他GPS类型卫星。展开更多
为比较分析城市道路观测环境下BDS-3/GPS组合RTK测量性能,探讨一种基于卡尔曼滤波算法的RTK测量模型。在统一BDS-3/GPS组合RTK测量时空基准的基础上,建立RTK观测方程模型,利用LAMBDA算法快速确定双差整周模糊度,并基于卡尔曼滤波算法求...为比较分析城市道路观测环境下BDS-3/GPS组合RTK测量性能,探讨一种基于卡尔曼滤波算法的RTK测量模型。在统一BDS-3/GPS组合RTK测量时空基准的基础上,建立RTK观测方程模型,利用LAMBDA算法快速确定双差整周模糊度,并基于卡尔曼滤波算法求解RTK观测方程模型测量结果;基于Visual Studio 2020平台,运用C/C++编程语言,设计和开发RTK数据处理软件(KalRTK),并比较分析BDS-3/GPS组合RTK测量结果。通过城市道路实测数据分析结果表明,BDS-3系统沿东西向跟踪卫星能力要略弱于GPS系统;BDS-3/GPS组合RTK测量的平面精度与高程精度均优于1.6cm,点位精度优于2.2cm,与GPS双频RTK测量精度基本相当,但优于BDS-3双频RTK测量精度。展开更多
China’s BeiDou Navigation Satellite System(BDS)construction has been completed and the system has been formally commissioned.Most of the Electric Power Systems(EPSs)for MEO satellites were developed by the Shanghai I...China’s BeiDou Navigation Satellite System(BDS)construction has been completed and the system has been formally commissioned.Most of the Electric Power Systems(EPSs)for MEO satellites were developed by the Shanghai Institute of Space Power-sources.The 42 V medium-voltage fully-regulated high-power EPS has been adopted for the first time in medium Earth orbit,with an output power reaching about 3 kW.Compared with the 42 V medium-voltage semi-regulated bus power system used in the Regional Navigation BDS-2 satellite,the EPS of the BDS-3 MEO satellites has increased power by about 80%,adopting many newly developed products such as high-efficient triple junction GaAs solar cells,high-energy-density lithium ion batteries and a high-efficient autonomous power control unit(PCU).Based on the studies on the medium-voltage fully-regulated and high-power EPS technical principles,and the adaptability and reliability of various working modes,the test verifications for the EPS were conducted both on the ground and in orbit.Compared with other global navigation satellite systems such as GPS,Galileo and GLONASS,the EPS of the BDS-3 MEO satellite has a long design life time which is equivalent to that of the GPS and Galileo,but with a larger power supply capability and power ratio,distinguishing its advancement in the field of satellite power technology.展开更多
为探究融合的北斗二号卫星导航系统(BDS-2)和北斗三号卫星导航系统(BDS-3)在亚太地区不同截止高度角下精密单点定位(PPP)性能,基于多GNSS实验系统(MGEX)中8个连续跟踪站24h观测数据,分别从卫星接收数量、卫星位置精度因子(PDOP)和双频...为探究融合的北斗二号卫星导航系统(BDS-2)和北斗三号卫星导航系统(BDS-3)在亚太地区不同截止高度角下精密单点定位(PPP)性能,基于多GNSS实验系统(MGEX)中8个连续跟踪站24h观测数据,分别从卫星接收数量、卫星位置精度因子(PDOP)和双频非组合PPP静态解方面分析和评估了9种不同截止高度角方案下的BDS-2/BDS-3融合定位性能。结果表明:当卫星截止高度角设置为0°~10°时,卫星接收数量呈现逐渐降低的趋势,而PDOP值变化并不显著,但当卫星截止高度角设置超过15°时,定位连续性方面将受到一定影响;不同卫星截止高度角对24 h PPP解水平方向定位精度影响非常小,特别是北方向,但对高程方向定位精度和三个方向(东、北和高程)的收敛时间影响较为显著。因此,在遮挡严重环境中,可通过长时间观测获取测站水平方向高精度坐标解,而对于高程方向可通过进一步融合其他卫星系统。展开更多
文摘为了分析当前GPS(Global Positioning System)、Galileo(Galileo Navigation Satellite System)和BDS-3(Beidou Navigation Satellite System with Global Coverage)广播星历的精度,详细分析研究了各种偏差改正及消除方法,并尽可能地消除了系统误差和粗差对评估结果的影响。选取2021-11-01/12-31共61天MGEX(multi-GNSS experiment)发布的多系统混合广播星历与武汉大学分析中心发布的事后精密星历数据进行实验,对GPS、Galileo和BDS-3近期广播星历精度进行对比分析,实验结果表明:3个系统广播星历整体精度由高到低依次是Galileo、BDS-3和GPS,其空间信号测距误差的RMS(root mean square)分别优于0.17、0.25和0.37 m,整体轨道精度的RMS分别优于0.17、0.12和0.25 m,BDS-3广播星历的轨道精度最高,钟差误差的RMS分别优于0.15、0.23和0.27 m,Galileo广播星历的钟差精度最高。对于GPS卫星的广播星历,blockⅢA卫星钟差和轨道精度均优于其他GPS类型卫星。
文摘为比较分析城市道路观测环境下BDS-3/GPS组合RTK测量性能,探讨一种基于卡尔曼滤波算法的RTK测量模型。在统一BDS-3/GPS组合RTK测量时空基准的基础上,建立RTK观测方程模型,利用LAMBDA算法快速确定双差整周模糊度,并基于卡尔曼滤波算法求解RTK观测方程模型测量结果;基于Visual Studio 2020平台,运用C/C++编程语言,设计和开发RTK数据处理软件(KalRTK),并比较分析BDS-3/GPS组合RTK测量结果。通过城市道路实测数据分析结果表明,BDS-3系统沿东西向跟踪卫星能力要略弱于GPS系统;BDS-3/GPS组合RTK测量的平面精度与高程精度均优于1.6cm,点位精度优于2.2cm,与GPS双频RTK测量精度基本相当,但优于BDS-3双频RTK测量精度。
文摘China’s BeiDou Navigation Satellite System(BDS)construction has been completed and the system has been formally commissioned.Most of the Electric Power Systems(EPSs)for MEO satellites were developed by the Shanghai Institute of Space Power-sources.The 42 V medium-voltage fully-regulated high-power EPS has been adopted for the first time in medium Earth orbit,with an output power reaching about 3 kW.Compared with the 42 V medium-voltage semi-regulated bus power system used in the Regional Navigation BDS-2 satellite,the EPS of the BDS-3 MEO satellites has increased power by about 80%,adopting many newly developed products such as high-efficient triple junction GaAs solar cells,high-energy-density lithium ion batteries and a high-efficient autonomous power control unit(PCU).Based on the studies on the medium-voltage fully-regulated and high-power EPS technical principles,and the adaptability and reliability of various working modes,the test verifications for the EPS were conducted both on the ground and in orbit.Compared with other global navigation satellite systems such as GPS,Galileo and GLONASS,the EPS of the BDS-3 MEO satellite has a long design life time which is equivalent to that of the GPS and Galileo,but with a larger power supply capability and power ratio,distinguishing its advancement in the field of satellite power technology.
文摘为探究融合的北斗二号卫星导航系统(BDS-2)和北斗三号卫星导航系统(BDS-3)在亚太地区不同截止高度角下精密单点定位(PPP)性能,基于多GNSS实验系统(MGEX)中8个连续跟踪站24h观测数据,分别从卫星接收数量、卫星位置精度因子(PDOP)和双频非组合PPP静态解方面分析和评估了9种不同截止高度角方案下的BDS-2/BDS-3融合定位性能。结果表明:当卫星截止高度角设置为0°~10°时,卫星接收数量呈现逐渐降低的趋势,而PDOP值变化并不显著,但当卫星截止高度角设置超过15°时,定位连续性方面将受到一定影响;不同卫星截止高度角对24 h PPP解水平方向定位精度影响非常小,特别是北方向,但对高程方向定位精度和三个方向(东、北和高程)的收敛时间影响较为显著。因此,在遮挡严重环境中,可通过长时间观测获取测站水平方向高精度坐标解,而对于高程方向可通过进一步融合其他卫星系统。
