整周模糊度固定是精密单点定位(precise point positioning,PPP)实现快速厘米级定位的关键。传统双频无电离层组合窄巷模糊度固定存在组合观测噪声放大而导致固定成功率低的问题,进而影响PPP的收敛时间。为此,该文联合北斗全球卫星导航...整周模糊度固定是精密单点定位(precise point positioning,PPP)实现快速厘米级定位的关键。传统双频无电离层组合窄巷模糊度固定存在组合观测噪声放大而导致固定成功率低的问题,进而影响PPP的收敛时间。为此,该文联合北斗全球卫星导航系统(BeiDou Global Navigation Satellite System,BDS-3)播发的新频点,提出了一种兼顾组合噪声抑制的四频无电离层快速PPP模糊度固定方法,并结合自制教学仪器设计了实验流程。该方法利用搭建的基准站和试验车构建静态和动态的实验场景,测试结果表明相比传统四频方法所提方法,的模糊度固定成功率在静态和动态场景下分别提升了8.4%和15.8%,显著提成了PPP的收敛时间。该文对多频PPP的模糊度固定流程进行了详细的说明,有助于学生更好地理解多频观测量组合对加快模糊度固定的优势及误差抑制的应对措施。展开更多
In view of the many scenes of unmanned aerial vehicle(UAV)detection,a third-party signal source is used to design a receiver to monitor the UAV.It is of great significance to understand the reflection of the signal il...In view of the many scenes of unmanned aerial vehicle(UAV)detection,a third-party signal source is used to design a receiver to monitor the UAV.It is of great significance to understand the reflection of the signal illuminating the UAV.Taking the communication base station(BS)signal as the third-party signal source,and considering the complete transmission link,reflection changes and loss fading of the communication signal,this study conducts model fitting for irregular UAV targets,simplifying complex targets into a combination of simple targets.Furthermore,the influence of the dielectric constant of the target surface and the signal irradiation angle on the signal reflection is analyzed.The analysis shows that the simulation results of this model fitting method are consistent with the results of other literature,which provides theoretical support for the detection of low and slow small targets such as UAVs.展开更多
文摘整周模糊度固定是精密单点定位(precise point positioning,PPP)实现快速厘米级定位的关键。传统双频无电离层组合窄巷模糊度固定存在组合观测噪声放大而导致固定成功率低的问题,进而影响PPP的收敛时间。为此,该文联合北斗全球卫星导航系统(BeiDou Global Navigation Satellite System,BDS-3)播发的新频点,提出了一种兼顾组合噪声抑制的四频无电离层快速PPP模糊度固定方法,并结合自制教学仪器设计了实验流程。该方法利用搭建的基准站和试验车构建静态和动态的实验场景,测试结果表明相比传统四频方法所提方法,的模糊度固定成功率在静态和动态场景下分别提升了8.4%和15.8%,显著提成了PPP的收敛时间。该文对多频PPP的模糊度固定流程进行了详细的说明,有助于学生更好地理解多频观测量组合对加快模糊度固定的优势及误差抑制的应对措施。
基金supported by the State Major Research and Development Project(2018YFB1802004)the State Key Laboratory of Air Traffic Management System and Technology(SKLATM201807)。
文摘In view of the many scenes of unmanned aerial vehicle(UAV)detection,a third-party signal source is used to design a receiver to monitor the UAV.It is of great significance to understand the reflection of the signal illuminating the UAV.Taking the communication base station(BS)signal as the third-party signal source,and considering the complete transmission link,reflection changes and loss fading of the communication signal,this study conducts model fitting for irregular UAV targets,simplifying complex targets into a combination of simple targets.Furthermore,the influence of the dielectric constant of the target surface and the signal irradiation angle on the signal reflection is analyzed.The analysis shows that the simulation results of this model fitting method are consistent with the results of other literature,which provides theoretical support for the detection of low and slow small targets such as UAVs.
