Design And Implementation Of Radar Signal Processing Based On Long-term Coherent Integratio

With the rapid development of the drone industry in recent years.While it brings convenience in life,it also provides criminals with a weapon for crime.Radar can detect such targets in real time around the clock,but it also has to make trade-offs between coverage and detection performance.Based on the long-term coherent accumulation of targets,this paper aims to study an algorithm that can improve the detection performance of low-speed weak targets,and complete the hardware implementation of the algorithm.This paper firstly studies the theory of long-time accumulation,and proposes a frame accumulation algorithm for weak target detection.The algorithm does not interfere with each other during signal processing,and all working waveforms are combined into one waveform during coherent accumulation.This method not only improves the coherent accumulation pulse period,but also protects the time resources of the radar.Using this method can greatly improve the low-speed detection performance of the radar.In order to ensure the coherence of signals during long-term operation,a channel correction method for phased array channels is proposed.In order to complete the hardware implementation of the algorithm,this paper studies clutter suppression and target information detection,and analyzes the performance of the clutter suppression and target detection algorithms that must be used.Then,a set of signal processing software is designed for the algorithm based on the background of an early warning radar.The waveform generation,beam synthesis and signal processing of radar under the frame accumulation algorithm are theoretically analyzed and designed;the problem of waveform and beam fast switching under the frame accumulation algorithm is solved by changing the working sequence.Finally,based on the hardware processing platform of DSP+FPGA,the simulation and realization of each working module of the algorithm are completed.The comparison and analysis of the field experiments show that the frame accumulation algorithm has better performance than the original algorithm.Through a large number of tests,it is proved that the radar signal processing system designed based on the frame accumulation algorithm can work normally.Compared with the original algorithm of the radar,the measured minimum speed that can be stably detected is reduced from 3m/s to 0.6m/s,the farthest detection is 5km,and the distance resolution can reach 10 m,which has strong practical significance.