LFMCW雷达的距离/多普勒处理

基于线性调频连续波雷达可提取目标的距离信息和多普勒频率，分析了线性调频连续波在高频雷达中的应用，推导出差频信号的表达式和利用二维快速傅里叶变换进行距离/多普勒处理的理论。提出了将距离/多普勒处理技术与自适应数字波束形成技术相结合，对杂波和干扰进行抑制的同时提取回波目标信息的方法。经计算机仿真结果表明，其方法有效可行。
关 键 词 距离/多普勒; 线性调频连续波; 自适应数字波束形成; 二维快速傅里叶变换

Abstract The radar used Linear frequency modulated continuous wave( LFMCW) signal can detect the information of range and Doppler of target. This paper analyzes the LFMCW signal used in HF radar, then deduces the expression of its beat frequency, and the theoretical for range/Doppler processing used two-dimensional fast Fourier transform(FFT) technique. The range/Doppler processing and the adaptive digital beamforming(ADBF) technique combined to extract the information of target echoes while control the effect of interrupt and noise. The simulation results are provided in this paper.
Key words range/Doppler; linear frequency modulated continuous wave; adaptive digital beamforming; two-dimensional fast Fourier transform