Design And Implementation Of Signal Processing System For UAV Monitoring Radar

With the rapid development of UAV technology in China,the scale of related industries is gradually expanding.Especially after the gradual opening of low-altitude airspace,UAV has been widely used in smart agriculture,power grid inspection,engineering mapping,natural resources investigation,emergency rescue and other civil fields,playing a positive role.At the same time,UAV have also brought huge security risks and seriously threatened national and social security.Therefore,it is urgent to establish a "low and slow small" UAV supervision system.Pulse Doppler radar is the preferred sensor for monitoring "low and slow small" UAV due to its relatively wide power range,high range and velocity dimensional resolution,and strong anti-clutter ability.Based on the analysis and demonstration of the functional requirements and technical indicators of the monitoring radar,this paper designs and implements the corresponding signal processing system,which has been tested in the laboratory and verified in the field.The main work and achievements of the thesis are as follows:(1)In view of the actual requirements of UAV monitoring,the system indicators of the monitoring radar are analyzed,and the technical indicators and specific parameters of the monitoring radar are demonstrated,which provides the basis for the subsequent system design and implementation.(2)The transmitting waveform,working time sequence and self-checking mode of UAV monitoring radar are designed,and the signal processing algorithm corresponding to the form of echo signal is designed,and the simulation experiment is carried out to verify.According to the task requirements of the signal processing system,the system framework is determined,the computing resources required by the algorithm process are estimated,and the main chip selection is completed.(3)The hardware circuit of each functional module of the signal processing board is analyzed and designed,including clock,signal acquisition,communication interface and power supply modules.The realization of signal processing algorithms on the hardware platform is completed,such as digital down conversion,pulse compression,moving target indication,moving target detection and constant false alarm processing.The problems encountered in the realization are discussed and analyzed.(4)The hardware system debugging and field test are completed.The test results show that the UAV monitoring radar signal processing system designed in this paper meets the requirements of performance indicators,works stably,and can effectively monitor "low and slow small" UAV.