基于分数阶傅里叶变换补偿多普勒徙动的动目标检测算法

摘要

提出了一种基于分数阶Fourier变换 (FRFT)的二次相位多普勒徙动补偿的动目标检测算法.该算法利用离散分数阶Fourier变换形成扫频滤波器组,实现对每个多普勒频率(径向速度)检测单元分别进行二次相位补偿和相参积累,有效增强了雷达在强杂波背景下对微弱运动目标的检测能力.仿真结果验证了本文算法的有效性.由于分数阶Fourier变换具有比较成熟的快速算法(与FFT计算量相当),所以所需的计算代价较小.%A novel moving-target-detection method with compensation for quadratic phase Doppler migration was proposed based on the fractional Fourier transform (FRFT). The compensation and the coherent integration in each detection cell were realized by the frequency sweep filter bank formed with the discrete FRFT to increase the ability of detecting weak moving targets effectively in the background of clutter. The simulated results show that the proposed method is effective. Since the efficient fast digital algorithm of FRFT, which has approximate computation complexity to classical FFT, was proposed, the computation cost brought by this method is poor.