关键词: 分数阶Fourier变换, 合成孔径雷达, 运动目标检测, 线性调频信号, 滤波

Abstract:

The detection of multiple moving targets whose scattering intensities differ evidently is difficult but important in airborne synthetic aperture radar (SAR) techniques. The traditional filtering method in the frequency domain and the modern time frequency distribution technique can't achieve this purpose. In this paper, it is analyzed that the echo of a moving target is a chirp signal naturally. Thus, a new technique of SAR moving target detection based on fractional Fourier transform is proposed. By eliminating large targets one by one in the fractional Fourier domain, the small targets can be detected effectiveness. The simulation results prove the effectiveness of this technique.

Key words: fractional Fourier transform, synthetic aperture radar, moving target detection, linear frequencymodulation signal, filtering