Study Of Lfmcw Radar Cfar Algorithm And Simulation

Linear Frequency Modulation Continous Wave (LFMCW) radar is paid more and more attention recently, because of the advantages of no range blind area, high range resolution and low signal power. The theories, key technologies and application are developed rapidly.In this thesis, focused on the LFMCW radars, target detection technique for slowly moving target in strong clutter background is studied. The main research work includes:1. Radar echo signals of ground target and clutter for LFMCW radar are modeled, simulated and verified. Hardware and software design, manufacture and debugging of a echo signal generator for LFMCW radar are accomplished to generate the simulated echo signals. These simulated echo signals can be used for radar singal processor debugging and testing as well as the test of constant false alarm rate (CFAR) processor.2. An improved CFAR algorithm called VITM-CFAR is proposed. Trimmed mean (TM) technique is adopted in variability index constant false alarm rate (VI-CFAR) method. The performance of detection and robustness especially in cluster verge and multiple targets environment are improved. The performance evaluation of proposed VITM-CFAR algorithm is accomplished. Simulation results verify the correction and effectiveness after compared with CA-CFAR, GO-CFAR and SO-CFAR methods.3. Combined with coherence processing, movement target detection(MTD) and CFAR, detection processing for slowly moving target in strong clutter background is finished. The signal processing software is programmed, deguged and tested by simulation data and experimental data. Simulation and experimental results show the correctness of the software.