Research On Post-repair Technology Of Flight Training Track Accuracy

The integrated avionics system of the training aircraft records the longitude,latitude,speed,heading,fuel,flow and other parameters in real time,For example,a flight training institute of Cessna172 R,DA40 and other small primary aircraft.The flight-related parameters are stored in the SD(Secure Digital Memory Card)card.Among them,the track data in the SD card comes from the GPS(Global Positioning System)satellite receiver on the training aircraft of our school.The receiver loaded on the training aircraft of our school can only use single frequency L1 C / A code signal,and the horizontal positioning accuracy is 10 m(95 %).The main error is composed of ephemeris error,star clock error and ionosphere error.Aiming at the problem of the main source of flight path error,the post-processing method is used to repair and modify the flight path data.In this thesis,the flight data of the Airport are studied and analyzed.The ephemeris error,clock error and ionosphere error are reduced by the correction method of wide-area difference technology afterwards.At the same time,the track data are optimized by establishing a mathematical model,so as to improve the accuracy of flight track.According to the characteristics of the flight training institute flight training aircraft track data error sources,this thesis mainly adopts the wide area difference technology and mathematical optimization model to improve the track accuracy.Firstly,according to the training characteristics of flight training aircraft,combined with the fixed reference position of airport runway and taxiway,the error analysis of flight training aircraft track is carried out.Secondly,combined with IGS(International GPS Service)precise ephemeris and ionospheric grid data,the post-processing wide-area difference technology is used to reduce the influence of ephemeris clock error and ionospheric error.Again,the required data extraction,cleaning,smoothing,combined with precision mapping airport runway data to analyze the flight training aircraft track characteristics.Parameters such as navigation speed and heading angle in SD card are used to correct the track and establish the mathematical optimization model.In the optimization process,the data are segmented by the triangular window function,which makes the optimization process faster and ensures the accuracy and continuity of the data.Finally,the processed data are compared and analyzed with the original data,and verified and demonstrated.The experimental results show that the average correction in the y direction is 5.1508 m,and the average correction in the x direction is 2.7306 m through the post wide-area difference correction technology.After the optimization of the track optimization model,the correction in the x direction and y direction is less than 1 m,but the fluctuation of the corrected track data is smaller and the track is smoother.The post-repair technology of flight data proposed in this thesis has good correction effect and effectively improves the accuracy of flight path data.Through the correction method in this thesis,the flight path with higher accuracy can be obtained,and then the flight driving technology of the flying cadets can be analyzed,evaluated and evaluated,which can avoid the influence of the subjectivity of the flight coach to a certain extent,and reduce the labor cost.This study can provide accurate data support for the core competency standard of the pilots ’ driving level.