Research On Low Altitude Radio Monitoring And Positioning Technology Based On Fusion Positioning Algorithm

At present,the domestic civil aviation industry has developed rapidly,and civil aviation communications are susceptible to interference from radio signals emitted by illegal radio stations and other radio equipment,so radio interference investigations are required.Traditionally,radio interference investigation is mainly to apply for assistance without commission,but there are significant shortcomings such as high cost,insignificant effect on ground interference sources,low efficiency,and inability to detect low-altitude interference sources.In addition,the existing domestic low-altitude radio monitoring systems such as DFA-1 and other monitoring systems have disadvantages such as large load restrictions and low monitoring time.Therefore,this article aims to study and build a low-altitude radio monitoring and positioning system that monitors the radio environment of the target area in a low-altitude scenario and analyzes and locates the interference source.The main research contents are as follows:First of all,the multi-information hybrid single-station passive positioning effect is better than the traditional single-information passive positioning,but the effect is still not good compared with the multi-station passive positioning,and the multi-station passive positioning equipment is complicated and costly.This paper proposes a single-station passive location algorithm based on the fusion of received signal strength and angle of arrival information.The algorithm uses a single UAV equipment virtual multi-station equipment to receive radio radiation source signals,carries out RSS distance estimation and AOA angle measurement,fuse RSS estimated distance information and AOA direction angle information,and constructs a fusion positioning algorithm based on the least squares rule To optimize the objective function,the convex relaxation technique is used to equate the objective function to a second-order cone programming problem and the interior point method is used to solve it.The simulation results show that the positioning performance of this algorithm is better than the single-station passive positioning algorithm,and because a single UAV is used to collect signals,its equipment complexity is lower than that of multi-station passive positioning.Second,build a radio aerial monitoring platform and a ground-based mobile station to monitor low-altitude radio spectrum information and analyze and display it.The working principle and composition of the low-altitude radio monitoring and positioning system are introduced.First,the radio aerial monitoring platform is used to collect radio signals,and then the collected radio information is transmitted to the ground-based mobile station through a point-to-point two-way broadband data link.Finally,design the radio monitoring and analysis software to realize the processing of radio spectrum information and locate the interference source through the information fusion positioning algorithm.Thirdly,field tests were conducted at Guilin Liangjiang Airport,Guilin University of Electronic Technology Jinjiling Campus and Huajiang Campus to test the basic functions and system performance of the low-altitude radio monitoring system,and combined with the fusion positioning algorithm to test its positioning performance.The test results show that the system can realize the spectrum monitoring of radio signals and the high-precision positioning of interference sources in low-altitude environments.Its monitoring time is long,the monitoring range is wide,the movement is flexible,the function is complete,the efficiency is high,and it can work in complex terrain,and can be widely used in the field of maintaining civil aviation safety.