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The algorithm allowed the extraction of target signatures from typical motions and classified between people, creatures, as well as other 'still' objects. Analytical expressions were derived using a pendulum design to define the micro-Doppler frequency shifts due to the periodic movement associated with human and animal limbs. The algorithm ended up being demonstrated making use of millimeter-wave radar running into the W-band. We employed a time-frequency circulation to analyze the detected sign and cla