Research On Track Measurement And Location Of LSS-UAV Based On Laser Detection Technology

In recent years,the low altitude,slow speed and small unmanned aerial vehicles(LSS-UAV in abbreviate)have increased sharply with the rapid development of the civilian unmanned aerial vehicle technology and also pose serious threats,such as the low altitude detecting threats of the key unit area,the interference of air routes,the terrorist threat to the city large gatherings and activities and so on.So,the anti LSS-UAV technology becomes the research hotspot in the word.Due to the complexity of the urban environment,involving with electromagnetic interference,noise,weather clutter etc.as well as some special characteristics of LSS-UAV targets,most of which are non-metallic materials,small radar reflection area and low speed,affected the Doppler-effect inapparently,the traditional detection methods,such as the radar,the acoustic detection and the radio detection are very difficult to detect and locate the target accurately.In contrast,the laser detection can effectively detect and locate targets by the characteristics of its short laser pulse duration,the high coherence and the high instantaneous power.On the basis of a large number of previous findings of the LSS-UAV targets intrusion detection technology at home and abroad,this study puts forward a method: applying the laser detection technology to detect the LSS-UAV targets.Compared with the radar scanning technology,sound detection and radio detection,the method has the advantages of high efficiency,easy to implement,more suitable for the LSS-UAV targets detection in the sight-distance range.The core contents of the thesis are to measure the distance,height,instantaneous velocity,acceleration,and 3d coordinate of the LSS-UAV targets in miniaturization structure to locate the LSS-UAV targets,and output location information in real time by using laser detection technique,which provides data for predicting the target track and the further disposal means.The study mainly designs flight attitude measuring and positioning system of the LSS-UAV based on the laser detection technology.Laser emission circuit,APD bias voltage circuit,amplifying circuit,echo signal threshold identification circuit,time interval measurement circuit and angle measurement circuit specializing in the design can ensure the reliability and accuracy of system.After preliminary test,the method can effectively realize the detection and location of the LSS-UAV targets in the sight-distance range in the urban environment.