Novel Detection Method for Multi-component LFM Signals

Multi-components Linear Frequency-Modulated (LFM) signal of emitter recognition is everywhere in signal environments in practice, it is important to recognize it for electronic intelligence. To effectively detect and recognize multi-component LFM emitter signals, a new emitter signal analysis method based on the complex Independent Component Analysis(ICA), second-order time moments and Wigner-Hough transform(WHT) (ISW) was proposed. The idea which was adopted to this method was the time-domain separation, the LFM signal and noise discrimination and time frequency analysis. In the low SNR cases, the problem which is generally plagued by noised of feature extraction of multicomponent LFM signal based on Wigner-Hough transform is overcome. Compared to the traditional method of time frequency analysis, the computer simulation results show that the proposed method for the multi-component LFM signal separation and feature extraction was better.