Research On Laser Resonance Scanning Technology For Low And Small Target Detection And Recognition

Today,as intelligence becomes closer to people's lives,the perception of the surrounding environment is becoming more and more urgent.For low-low and small air targets,if they are still detected by microwave radar,they are not detected within the detection distance of about 1km.If the current popular on-board MEMS laser radar is used for detection,If it is detected,it will not be detected by its detection distance of several hundred meters.Therefore,based on the above situation,a resonant mirror scanning lidar system for detecting low and small targets is proposed to meet the current requirements for low and low target detection,such as anti-UAV.This paper mainly discusses the scanning part of this laser radar system,mainly from the following aspects:(1)The entire resonant mirror scanning imaging lidar system was described,and then its resonant galvanometer scanning system was emphasized.That is,the entire resonant galvanometer scanning system is constructed,the signal is modulated and amplified into the double galvanometer system,the X galvanometer is a resonant scanning mirror,and the Y galvanometer is a galvanometer scanning galvanometer.The scanning principle of the galvanometer is explained,and the selection of the scanning galvanometer model is completed.(2)For the common scan curves,the scan curves that best fit the system were selected.Compared with the galvanometer galvanometer,the scanning characteristics of the resonant galvanometer were also tested,and the relationship between the scanning angle and the voltage at both ends was observed.(3)For the motion of the resonant galvanometer,under the multi-scan of high-speed frequency,due to the inertia of its resonant motion,the drift of the scan line will be caused.Aiming at the problem of image drift,the closed-loop PID control method is proposed for correction,and the experimental results are simulated.Afterwards,the calibration effect was tested,and the experimental image was compared with the theoretical simulation image to analyze the result.(4)Compared with the ideal simulation results,the actual following conditions are still somewhat different,but it is enough to meet the detection distance of 1km,and the detection target of the scanning angle of 5~O is required because the size of the scanning galvanometer in the system is large.It also receives a large inertia force.Through the final experimental comparison,after 1000 scans,the drift condition is much better than the direct galvanometer scan.