基于分数阶傅里叶变换的SAR运动目标检测与成像

基于分数阶傅里叶变换（ＦＲＦＴ）的ｃｈｉｒｐ基分解特性及分数阶傅里叶变换与时频分布的关系，提出了基于ＦＲＦＴ的ＳＡＲ运动目标检测和成像的新方法，并给出了处理方案和计算机仿真结果。与传统的ＷＶＤ－ＨＴ方法相比，作为线性变换的ＦＲＦＴ方法不需考虑多目标时的交叉项问题，从而省去了ＷＶＤ－ＨＴ方法中ＷＶＤ值从直角坐标到极坐标的转换和二维搜索的Ｈｏｕｇｈ变换，简化了处理，降低了计算复杂度。

SAR MOVING TARGET DETECTION AND IMAGING BASED ON FRACTIONAL FOURIER TRANSFORM

Based on the property of the chirp basis decomposition of the fractional Fourier transform(FRFT) and its relationship with the time frequency distribution, a new SAR moving target detection and imaging method is proposed in this paper. Besides, the processing scheme and the computer simulation results are given. Compared with the conventional WVD HT method, due to the linear property of the FRFT, the new method does not have to pay any attention to the cross-term interference,it therefore omits the WVD data exchange from the Cartesian coordinates to the polar coordinates and the two dimensional sweeping process of Hough transform in the WVD HT method, thus it simplifies processing and decreases the computational burden.