Multi-UAV Based Civil Aviation Radio Interference Source Localization Method Research

Monitoring and analyzing radio interference sources play an important role in the safe operation of civil aviation navigation and communication,airport operation management and air traffic control.The traditional ground monitoring methods are slow and difficult to detect air interference.Although helicopters and airships can effectively monitor air interference,the flight approval process is also slow and the cost is high.In response to this problem,this thesis focuses on the research of civil aviation radio and the method of locating the source of civil aviation radio interference based on multiple small Unmanned Aerial Vehicles(UAVs).The main research contents of the thesis are as follows:(1)The civil aviation radio application and its interference are studied.Firstly,the working frequency band and working principle of the radio equipment in the civil aviation communication,navigation and monitoring system are studied,and the common radio frequency spectrum in civil aviation is drawn.Then,the jamming principle of three main jamming types is studied,and the method of determining jamming type is analyzed.Secondly,three propagation models of radio are studied and the path loss is simulated respectively.Finally,three refractive index models for radio propagation in the atmosphere are studied,and the atmospheric refractive index at different heights is simulated.(2)The method of locating the radio interference source of civil aviation is studied.Firstly,the method of locating the interference source on the ground is studied,including the ground positioning process and the ground monitoring equipment.Secondly,the method of locating the interference source in the air is studied,including the air monitoring specification and the performance evaluation index of the positioning method,and the multi-UAVs based direction finding positioning,time difference positioning,and frequency difference positioning models are constructed,and the geometrical dilution of precision(GDOP)of locating algorithm is simulated respectively.(3)The method of locating the radio interference source of civil aviation by multiple UAVs is designed.Firstly,the cross-location method of the two aircrafts is designed.The specific process of the method of locating the radio interference source of the two UAVs in the air is also formulated,and the direction-finding positioning model and the coordinate system exchange model are integrated to complete the cross-location algorithm of the two UAVs.At the same time,the composition of the UAV monitoring platform and the composition of the software for analyzing radio interference sources on the ground are presented.Then,the four UAVs time-frequency difference positioning algorithm is completed,and the method model of the four UAVs air positioning radio interference source is constructed.Besides,the four UAVs time synchronization method and the four UAVs data communication method are proposed.(4)The test of the method of locating the radio interference source of civil aviation by multiple UAVs has been completed.First,the cross-positioning method of the two UAVs was tested,including the direction finding error test of the UAV platform,the monitoring radius test of the UAV platform,and the cross-positioning test of the UAV platform.Test results verify the feasibility of the two UAVs based method for locating radio interference sources.Then,the four UAVs time-frequency difference positioning method is simulated,including the GDOP of the positioning of the UAV with different station layouts,the positioning bias and the root mean squared error under the conditions of different moving speeds of the interference source.