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中文摘要：
在分析线性调频信号分数阶Fourier变换的频移特性的基础上,提出了一种基于频域延时FR-FT模函数对消的海面弱运动目标检测方法。此方法在基本不减弱信号的情况下有效地抑制了海杂波,在低信杂比条件下有较好的检测性能。利用IPIX实测数据仿真实验表明,所提方法在改善信杂比以及提高检测概率等方面都明显优于仅对回波作FRFT变换。文中给出的检测概率曲线表明该方法在低信杂比条件下具有较高的检测概率,证实了方法的有效性。
英文摘要：
In the paper,the frequency shift characteristic of the LFM signal after fractional Fourier transform is analyzed.Based on this characteristic,a new method based on frequency-lapse FRFT module difference in frequency field for detect weak targets in sea clutter is proposed.In the method,the signal is hardly weakened and the sea clutter is suppressed effectively.Experiment using the IPIX data shows that the method has remarkably advantage in improving SCR and increasing the detection probability,compared with FRFT. The detection probability curve gives in the paper shows that the method has better detection probability and effectivity.
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