分数阶Fourier域多分量微弱LFM信号的检测

Detection of Multi-Component Weak LFM Signal in Fractional Fourier Domain

为了提高对多分量微弱LFM信号的检测能力,提出了一种基于分数阶Fourier域非均匀采样理论的信号检测方法。首先提出了一种自适应非均匀采样方法,建立了该方法的模型,得到了非均匀采样LFM信号在分数阶Fourier域的频谱表达式。在此基础上,对多分量非均匀采样LFM信号进行了检测研究。计算机仿真结果表明,同传统的信号检测方法相比,该方法对微弱LFM信号具有较好的检测能力,而且减少了运算量,满足了实时性要求。

In order to improve the detection ability to multi-component weak linear frequency modulation（LFM） signal,a kind of signal detection method based on the nonuniform sampling theory of fractional Fourier domain is presented.Firstly,this paper proposes a self-adaptive nonuniform sampling method,and establishes the model of this method,then fetches the spectrum expression of the nonuniform sampling LFM signal in fractional Fourier domain,based on which,detects and studies the multi-component nonuniform sampling LFM signal.The result of the computer simulation shows：compared with traditional signal-detection methods,the presented method has better ability to detect weak LFM signal,and reduces the operation quantity,meets the real-time request.