基于線性調(diào)頻連續(xù)波雷達可提取目標的距離信息和多普勒頻率，分析了線性調(diào)頻連續(xù)波在高頻雷達中的應(yīng)用，推導(dǎo)出差頻信號的表達式和利用二維快速傅里葉變換進行距離/多普勒處理的理論。提出了將距離/多普勒處理技術(shù)與自適應(yīng)數(shù)字波束形成技術(shù)相結(jié)合，對雜波和干擾進行抑制的同時提取回波目標信息的方法。經(jīng)計算機仿真結(jié)果表明，其方法有效可行。
關(guān) 鍵 詞 距離/多普勒; 線性調(diào)頻連續(xù)波; 自適應(yīng)數(shù)字波束形成; 二維快速傅里葉變換

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