Research On Improving The Positioning Accuracy Of UAV Flight Path Based On Wavelet Analysis And Trajectory Interpolation

The satellite positioning system is a technology that uses the satellite navigation system to accurately locate the objects to be measured.With the continuous development of science,satellite positioning technology has developed from the initial low positioning accuracy,unable to locate in real time,difficult to provide timely navigation services,to today's high-precision GPS global positioning system.Satellite positioning has played an important role in vehicle positioning,aerospace navigation,ocean observation,engineering survey and other fields.The carrier phase measurement technology of satellite positioning signal is also maturing and widely used.On the other hand,with the continuous development of UAV technology,in the field of engineering measurement,the research of using UAV to measure the places that are difficult for human to get involved in has also been widely concerned,among which the positioning measurement for UAV is a very important research.At present,the technology applied in UAV positioning measurement mainly includes real-time kinematic(RTK)technology and post processed kinematic(PPK)technology.GPS RTK technology can process the carrier phase observation of two stations in real time and obtain centimeter level positioning accuracy,so it has been widely concerned in engineering survey,especially in UAV aerial survey.However,RTK needs real-time signal transmission between reference station and mobile station in the course of UAV aerial survey,so it is often affected by many factors of environment in the process of UAV flight,and in actual use,it will be limited to some extent to affect the effect of UAV aerial survey and positioning.GPS PPK technology is a kind of dynamic post-processing technology.In the process of Surveying and positioning,the base station and the mobile station are observed synchronously,and the difference processing is carried out after the observation,so there is no need for real-time communication between the base station and the mobile station,which effectively makes up for the shortage of RTK.However,PPK technology does not need the real-time communication between the reference station and the mobile station,so it can not have the real-time characteristics like RTK technology,which leads to the data collected by PPK technology will be affected by external factors during the flight process of UAV,resulting in data loss and actual observation error,so it has certain limitations in practical engineering application.In this paper,aiming at the defect that PPK technology has no real-time error,by analyzing the causes of error and data loss in PPK technology positioning,based on wavelet transform and trajectory interpolation theory,the error influencing factors in PPK technology are respectively repaired,so as to improve the availability of PPK technology data.Through the use of simulation experiments to verify the feasibility of wavelet transform and trajectory interpolation in practical application,the research results show that the use of wavelet transform and interpolation method can effectively deal with the errors in the actual measurement process of PPK technology,and demonstrate the feasibility of this method in improving the practical engineering application of PPK technology.