Research On The Interference And Countermeasures Of Small Civilian UAV

With the rapid development of unmanned aerial vehicle market,it brings convenience to people,but also exposes a series of public security risks.It is urgent to put forward a feasible civil UAV control scheme,electromagnetic interference is an indispensable part of unmanned aerial vehicle countermeasures system.According to the characteristics of unmanned aerial vehicle system,this paper discusses deception jamming and suppression jamming against UAV navigation and positioning system and data link communication system respectively.Unmanned aerial vehicle measurement and control communication system mainly relies on data transmission link to complete the control,tracking and positioning of UAV,it is the key to achieve man-machine integration,and mainly complete the UAV remote control,tracking and positioning and information transmission.It is the key to the normal operation of unmanned aerial vehicle and the target of electromagnetic interference in UAV countermeasures.UAV measurement and control communication system mainly includes UAV data link communication system and UAV navigation and positioning communication system.UAV data link communication includes remote control uplink and UAV downlink transmission and state link,frequency hopping spread spectrum method is used to achieve stable communication in high noise environment.In this paper,the actual UAV signal is collected and analyzed,its communication characteristics are summarized.The frequency hopping spread spectrum communication principle and common interference methods are discussed.Finally,the appropriate interference strategy for UAV data link communication is summarized through simulation.As a general positioning system,GPS has incomparable advantages over other navigation equipment,so it is widely used in unmanned aerial vehicle navigation and positioning system.To jamming it can make the UAV lose or error positioning,so as to achieve the purpose of unmanned aerial vehicle countermeasures.In this paper,the principle of GPS system is studied,the application of direct sequence spread spectrum communication technology in GPS system is discussed,and the common interference methods for GPS system are studied.Finally,the appropriate interference strategy is summarized through simulation.Through to the acquisition and analysis of real unmanned aerial vehicle's signal,some commonly used interference methods for UAV communication system was studied.According to the theoretical analysis and interference simulation results,compared the effectiveness of this interference methods.Finally interference system integration was performed,the actual interference effect to the real UAV was tested.