Research And Implementation On Agile Radio Technology For UAV Signal Reconnaissance Receiver

Recently,as the demand for civilian UAV(UAV,Unmanned Aerial Vehicle)is growing,its problems also appear.Crime violations by using UAVs occur from time to time.Therefore,the UAV counter-control technology has become a research focus.Correspondingly,the detection,cracking and precisionly-striking of UAV signals in complex electromagnetic environment has become a hot research topic in the field of anti-UAV.Thus,the research of reconnaissance,recognition and reception technology for UAV signals and the exploration of the smallization and low-cost rapid realization of related technologys are both of great significance to promote the development of cognitive radio technology for anti-UAV.This paper studies communication principles and reconnaissance receiption technologies of UAV telemetry signal.Some friendly-to-implement algorithms for UAV telemetry signals’ detection are put forward.Moreover,this paper summarizes agile radio design process by combining agile methods with software radio development schemes.Finally,a signal processing platform for UAV is developed and the receiption algorithms are realized in the platform.The main work and results of this paper are as follows.1,This paper studies the communication principles and reconnaissance receiption technologies for UAV telemetry signal and deeply discusses the frequency hopping signals’ blind detection problems.A multi-segment power spectrum elimination method is put forward basing on the traditional method.Experiments for UAV simulation signals detection are achieved in-18 d B SNR environment and frequency collision situations.The actual UAV signals are also used for detection experiments to varifiing the algorithm.2,The demodulating receiving workflow and reconnaissance receiption technologies of UAV telemetry signal are studied in this paper.According to modulation types,the UAV baseband signals could be divided into single-carrier and multi-carrier.A through research on blind synchronization technology,a key technology in baseband signal receiption,using two synchronization algorithms based on median filtering and the maximum likelihood algorithm based on the loop prefix aimed at the two kinds of signals are carried.Meanwhile,experiments using two kinds of UAV actual signals are succeed,which guarantee the correctness and practicability for proposed algorithm.3,The paper discusses the possibility and challenges for combining agile development into software defined radio system.a model-oriented development approach for agile radio systems is proposed based on Scrum framework.Build a signal processing platform for UAV and delelop the receiption technologies on this platform,completed the receiption of a UAV telemetry signal in a particularly frequency point.Meantime,the availability and correctness of this agile radio method and development platform in the field of drone signal processing is verified.