title: Ultrasonic Doppler methods to extract signatures of a walking human.
abstract: Extraction of Doppler signatures that characterize human motion has attracted a growing interest in recent years. These Doppler signatures are generated by various components of the human body while walking, and contain unique features that can be used for human detection and recognition. Although, a significant amount of research has been done in radio frequency regime for human Doppler signature extraction, considerably less has been done in acoustics. In this work, 40 kHz ultrasonic sonar is employed to measure the Doppler signature generated by the motion of body segments using different electronic and signal processing schemes. These schemes are based on both analog and digital demodulation with homodyne and heterodyne receiver circuitry. The results and analyses from these different schemes are presented.
authors.affiliation: U.S. Army Research Laboratory, 2800 Powder Mill Road, Adelphi, Maryland 20783, USA. asif.kyani@gmail.com
authors.forename: Asif
authors.initials: A
authors.lastname: Mehmood
authors.forename: James M
authors.initials: JM
authors.lastname: Sabatier
authors.forename: Thyagaraju
authors.initials: T
authors.lastname: Damarla
mesh_terms: D004867:Equipment Design; D006801:Humans; D035002:Lower Extremity / Q000000981:diagnostic imaging / Q000502:physiology; D008954:Models, Biological; D012815:Signal Processing, Computer-Assisted; D013997:Time Factors; D060726:Torso / Q000000981:diagnostic imaging / Q000473:pathology; D014159:Transducers; D018608:Ultrasonography, Doppler / Q000295:instrumentation; D034941:Upper Extremity / Q000000981:diagnostic imaging / Q000502:physiology; D016138:Walking