摘要
首先建立高速运动目标宽带雷达回波模型,分析了高速运动对目标一维距离像的影响,针对其回波是调频斜率相同的多分量LFM信号的特点,提出利用自适应短时傅立叶变换的方法获得一维瞬时距离像,消除了高速运动目标距离压缩中的色散效应,经过运动补偿和横向分辨,最终获得目标清晰的二维像.和传统速度补偿方法相比,有效减小了运算量,仿真证明了该方法的有效性.
A target echo model illuminated by wideband linear frequency modulated radar signal was established and the effect of high speed on the target echoes was analyzed. Regarding the characteristic of high speed target echo which consisted of multi-component LFM signal with the same chirp rates, a method based on instant range profile using adaptive STFT was presented. After motion compensation and Fourier analysis in the cross range, a two-dimensional （2D） image would be achieved finally. The preposed method solves the problem of range dispersion of the dechirped echo caused by high-speed and reduces the computation effectively, as demonstrated by computer simulation results.
