Design And Implementation Of Multi-Channel Parallel PD Radar Signal Processing System

Pulse Doppler radar has been used in the field of military fire control and prevention and control in the 1960 s.Nowadays,the call for response to military-civilian integration has been initially applied to the field of civil air control.Different from the general military pulsed Doppler radar,the pulse Doppler radar studied in this thesis mainly detects low-altitude slowspeed small-RCS targets.The rapid development of drones has also brought many hidden dangers to the drone industry;the loss of personnel caused by failures during take-off and landing;Interfere with the normal flight of military civil aircraft;the leakage of international secrets;the destruction by terrorists.At present,the most effective means of countering UAVs is the PD radar system.This thesis mainly studies the radar signal processing system of pulse Doppler system for detecting low-altitude slow small-RCS targets.The signal processor design architecture consists of four channels of AD,Parallel acquisition sum,azimuth difference,pitch difference and protection channel four AD signals.There are three DSP chips,1 chip completes command forwarding and processor status return,and the other two complete Constant False-Alarm Rate(CFAR)detection.And one FPGA chip completes the timing control of the signal processing part and the external hardware of the entire system.The signal processing part including digital down-conversion(DDC)processing and echo pulse compression(PC)of radar echo signal.It utilizes the design idea of AXI-Stream bus protocol,standardizes various module interface design to improve the readability of design code and maintainability.Secondly,in the actual scheme design process,the adaptive dynamic intercept module and the high-efficiency transposition module are added to optimize the signal-to-noise ratio of the signal,which breaks the bottleneck of insufficient performance in processing the high-speed rate data in the system design.Then,according to the above design and engineering practice,some modules are optimized,which has great practical significance for the realization of theoretical algorithms to practical engineering.Finally,it summarizes the shortcomings of the paper and looks forward to the future work.