Design Of Radio/Acoustic Detection Module And Research On Target Recognition Method

As the rotary-wing drones become more and more popular and advanced,supervision and countermeasures of rotary-wing drones also need to be resolved urgently.Among many countermeasures,the ammunition counter UAV has the characteristics of high precision,easy to carry and transfer,etc.,which are more attractive.The battlefield environment is becoming more and more complex.Improving the environmental adaptability of ammunition fuzes and detection accuracy have become important scientific research directions of many countries.Compound detection can effectively solve the problems of insufficient environmental adaptability of single-mode detection and low recognition probability.The research on the principle of radio/acoustic compound detection and target recognition methods is required by battlefields and has scientific research value.Aiming at the detection and identification of rotor targets in the near-field environment,this paper uses a radio/acoustic composite detection module to eliminate the interference of false targets in complex environments.Through the analysis of the target micro-Doppler characteristics and aerodynamic noise,the design and selection of detectors are completed and the target correlation characteristics of the micro-Doppler frequency,aerodynamic noise frequency and the blade speed are established.According to the working mechanism of the radio/acoustic composite module,an improved template matching method based on fuzzy theory is designed for recognizing the rotor targets.The target information of a single blade,extract micro-Doppler frequency and amplitude characteristics,aerodynamic noise frequency and decibel value characteristics,and composite correlation characteristic information;are obtained from indoor experiments.By using the amplifier data collected from self-assembled quadrotor drones in the outdoor environment,the standard library that uses the advanced template matching method is established,the DJI aerial drones have been tested,and the data has been processed.During simulation and experiments,data is collected from the radio detection transceiver modules and the passive acoustic detection modules that have been used in both indoor and outdoor experiments.The results show that after adopting the improved template matching method,the detection accuracy of the composite module is increased from 65%to 80%.The designed improved template matching recognition algorithm significantly increases the accuracy of recognizing the composite detection modules.