The Research On Generalaviation Aircraft Monitoring Technology Based On Beidou/ADS-B

With the rapid development of China's civil aviation industry,the Civil Aviation Administration has paid more and more attention to the issue of flight safety in low-altitude airspace.In recent years,in the context of the integration of military and civilian development,ADS-B technology has been widely used in air traffic control to provide surveillance services for safe flight.After understanding the working principle of ads-b system,the coding and decoding algorithm of ads-b message,the filtering and processing algorithm of track data and the realization of multi-source data monitoring scheme are mainly studied.In this thesis,the working principle of ads-b system is introduced in detail,and the format of ads-b message is analyzed.The CPR coding and decoding technology of message are studied,and another realization idea that is easy to understand is put forward.Through the acquisition of ads-b message from the actual receiver equipment combined with the Qt development platform,verification of message decoding algorithm and software design were carried out.On the basis of the successful decoding of the key information in ads-b message,this thesis studies and discusses the track filtering algorithm.In this thesis,the interactive multi-model(IMM)algorithm is used to filter the track,and the adaptive algorithm is used to improve the motion model set of the classical IMM algorithm.The improved model set is used to estimate the current position,velocity and acceleration of the target.The model transition probability is modified to improve the adaptive ability of the IMM algorithm and achieve fast target tracking.The algorithm is verified by using the simulated track data and the measured data received by the actual device.Finally,CPR coding technology is deeply studied.By using STM32 as controller and GPRS wireless network as communication mode,BeiDou portable equipment is designed.The BeiDou data is encoded as ADS-B message format and sent to the ADS-B network monitoring platform,which is parsed and stored in the database.The information of low-altitude aircraft situation is displayed through the display system.