Research On Aircraft Surveillance Data Fusion And ITP Application

With the extensive use of Automatic Dependent Surveillance-Broadcast technology(ADS-B)in the global aviation industry,the research of sending and receiving surveillance data,known as ADS-B OUT and ADS-B IN,has grown to be mature,and the application of surveillance data,which is known as Aircraft Surveillance Application System(ASA),has been attached greater importance.The data sources of ASA are the surveillance data from traffic,ownship and ground.If those data are displayed directly,flight crew may make some misjudgements because of redundant targets.Therefore,it is necessary to study the fusion of surveillance data in detail.On the other hand,ASA boasts a variety of surveillance applications,and In-Trail Procedure(ITP)is the typical one.ITP can significantly reduce the vertical intervals required for aircraft flight level changes in non-radar coverage areas,improving the safety and efficiency of flight level changes.This thesis,starts from the perspective of ASA,analyzes the functional structure and basic principle of ASA,and studies the fusion algorithm for integrating multiple surveillance data and removing redundant tracks in depth.In addition,focusing on the ITP application,this thesis makes a detailed research on the functional procedures,airworthiness judgement,and collision risk analysis of ITP.Meanwhile,using the C++Builder software platform,the thesis achieves the function of ASA system and its ITP application.The main work is as follows:1.Aiming at integrating multiple surveillance data,the processing of surveillance data fusion is studied,including track initial,track maintenance,track termination,track association,track fusion and track file generation.This thesis focuses on the track maintenance using Kalman filtering algorithm to predict the track points,the track correlation through space window and the track fusion based on optimal fusion.It uses MATLAB simulation to verify and analyze the performance of fusion algorithm.Under the condition of NACp=7,the correct rate of track correlation is 99.68%.2.The ITP application of ASA is studied,including its functional procedures,airworthiness judgement and collision risk analysis.The calculation method of surveillance state parameters and the ITP request-license mechanism are analyzed in detail.With regard to the airworthiness requirements of ITP,this thesis proposes a method to judge its airworthiness,which is based on the position accuracy and integrity of navigation.It is concluded that this method is effective through running public GPS data by means of MATLAB.It focuses on the collision risk of ITP operations,obtaining the probability of aircraft collision under various positioning factors,such as surveillance position error.This thesis analyzes the probability of ITP operation,and verifies the safety of ITP operation with the condition that the difference of aircraft altitude is less than 3656 ft.3.Based on C++Builder software development platform,three software terminals are designed and made,including scenario simulator,ADS-B IN and ground.ADS-B IN completes the simulation of ITP functional procedures with the assistant of scenario simulator and ground,realizing the functions of ASA system in ADS-B IN.Those functions include error validation,aircraft information decoding,track generation,track maintenance,track termination,track correlation,track fusion,ITP surveillance state parameters calculation and ITP request-license mechanism.Through software simulation,the analysis of ASA system and its ITP application is verified to be correct.