Research And Software Implementation Of UAV Detection Method Based On FMCW Radar

As people continue to upgrade their entertainment methods,small drones have realized the transformation from industrial to consumer level and come into the public eye.The widespread use of small UAV brings new opportunities and challenges to the development of market and scientific research,but also makes people’s security and privacy face new threats.In order to deal with this threat,timely and effective detection of UAV targets is the most important work at present.As a typical low,small and slow target,there are still many difficulties in the reliable detection of UAVs.Therefore,the development of small UAV detection algorithm research has important application value.In this thesis,the detection method of rotor UAV in motion state and hover state under FMCW radar is studied,and the target detection software system of UAV with LFMCW radar is designed and developed.The specific research content is as follows.1.The target detection method and ranging velocity measurement principle of frequency modulated CW radar are studied,and the echo model of Rotary wing UAV target under the radar of this system is established,which provides a theoretical basis for the study of the detection method of Rotary wing UAV target.2.For the rotor UAV target in motion state,moving target detection,constant false alarm detection and tracking methods before detection based on dynamic programming are studied.DP-TBD is applied in range-Doppler spectrum,and DP-TBD detection algorithm based on CFAR preprocessing under LFMCW radar system is proposed.Aiming at the hovering rotor UAV target,the feasibility of detection by Doppler spectrum broadening characteristics of rotor echo signal is analyzed,and the detection algorithm of hovering rotor UAV based on Doppler spectrum broadening characteristics is proposed.Both algorithms have good detection performance.3.Aiming at the problems that UAV in specific flight state is difficult to reproduce through experiment and the development cycle of target detection algorithm is long,a plug-in based LFMCW radar UAV target detection simulation software system was designed and developed.The simulation system can realize the functions of radar simulation and algorithm parameter configuration,play the plan script,and present the detection results in real time,so as to facilitate the simulation analysis of the UAV target and the performance evaluation of the detection algorithm.The above work has been verified and analyzed through simulation experiments.The results show that the current method can be effectively detected in the motion and hovering state,and the designed LFMCW radar UAV target detection system can be effectively operated and accurately detected.