Abstract
Human walking may induce Doppler and microDoppler modulation on radar echoes which are multi-component and very complex. This study aims to deduce the radar echoes of human walking and extract Doppler and micro-Doppler signatures from radar echoes. In order to extract Doppler and micro-Doppler features more accurately, we use a variety of time-frequency methods to obtain the micro-Doppler spectrum of radar echoes, and to analyze the advantages and disadvantages of each time-frequency method and the scope of application. As the radar echoes contain the all parts of human body components, the empirical mode decomposition method (EMD) was used to decompose the echo signal and then analyze it on Short-time Fourier transform which has better performance and can be extracted all parts of the human micro-Doppler signatures.
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