基于FRFT的非线性调频信号检测

基于分数阶傅里叶变换提供了信号从时域到频域平滑变化的特点，将分数阶傅里叶变换应用到非线性调频信号的估计和检测中，对非线性调频信号进行分段线性逼近。利用逼近后信号的Wigner—Ville时频分布以及原信号的时频分布的掩模结果进行能量累积，将积累结果作为检测统计量。在本算法中，以时频联合分析的角度，提出了基于时频域能量积累的信号检测器。最后将本方法和传统的非相干能量积累方法作比较，提出的算法获得了较好的检测性能。

Detection of Nonlinear Signals Using FRFT

Based on fractional Fourier transformation (FRFT),the feature of the signals which vary smoothly from time domain to frequency domain is given.The FRFT method is applied to the estimation and detection of nonlinear frequency modulated signals to which piecewise linearly approach.Wigner-Ville time frequency distribution of the signals is used after approaching and the masking results of the original signal to accumulate energy as detecting statistic.A signal detector based on energy accumulation from time fr...