Micro-Doppler Signal Analysis Based on theGeneralized S Transform for Radar Targets

The Generalized S transform (GST), whichcombines advantages of the Short time Fourier transform(STFT) and the Continuous wavelet transform (CWT), isan effective method to analyze and extract time-frequencyfeatures. On the basis of micro-Doppler effect in radarecho, an improved GST with adjusted window functionwas introduced, and its expression as operation of theFourier spectrum was developed. Simulated radar signalsof typical micro-Doppler modulation were applied tocompare and test the GST and other three common timefrequencytechniques. The experimental results show thatthe GST with adjusted window function is a noise robustand adaptive transform, reduces computational burden,and provides more details of the local time-frequency featuresused to improve resolution and parameter estimationof micro-motion, which demonstrates its effectiveness inmicro-Doppler signal analysis.