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Abstract. The problem of multi-component radar emitter signal processing is studied, an effective method based on time-varying filtering is proposed to detect and separate the multi-component signal in radar reconnaissance occasion. Each signal component in the time-frequency plane is detected by the region growing method which is an image segmentation algorithm. Firstly, the linear frequency modulation (LFM) components in the multi-component signal are separated by fractional Fourier transform (FRFT). And then, the components which don't interact in the time or frequency domains are filtered. Finally, the components which interact in the time-frequency domains are separated by the support vector machine (SVM). Simulation results show that the proposed method can detect and separate multi-component signal effectively.

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