摘要
提出了一种多线性调频信号自适应时频表示方法及其快速算法:首先采用分数阶傅里叶变换的快速算法计算出模糊函数,再通过Radon-Ambiguity变换设计出信号的最优核函数,以滤除噪声和多线性调频信号在模糊域中的互项,最后通过二维傅里叶变换得到信号的时频表示。在多分量线性调频信号情况下借助"clean"的思想来抑制强分量对弱分量的干扰。仿真表明该方法在低信噪比环境下也十分有效,且运算复杂度小。
A method for multi-LFM signals adaptive time-frequency representation is proposed. Firstly, the ambiguity function is realized by fast algorithm of fractional Fourier transform. Secondly, the optimal kernel function is designed by Radon-Ambiguity transform, which can remove the cross term and partly noise. Finally, the time-frequency representation is realized by two-dimensional Fourier transform. To eliminate the mutual in- terference of multiple LFM components, especially the strong LFM signals to weak LFM signals, a scheme based on the idea of clean is proposed. The simulation results show that the method is effective even in low SNR environment with less computational complexity.
出处
《系统工程与电子技术》
EI
CSCD
北大核心
2008年第7期1245-1248,共4页
Systems Engineering and Electronics
