Target detection and feature extraction in indoor and outdoor environments using micro-Doppler analysis

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Authors
  1. Thayaparan, T.
  2. Stankovic, L.
  3. Gjorovic, I.
Corporate Authors
Defence R&D Canada - Ottawa, Ottawa ONT (CAN)
Abstract
In many cases, a target or a structure on a target may have micro-motions, such as vibrations or rotations. Micro-motions of structures on a target may introduce frequency modulation on the returned radar signal and generate sidebands on the Doppler frequency shift of the target’s body. The modulation due to micro-motion is called the micro-Doppler (m-D) phenomenon. In this report, we present an effective quadratic time-frequency S-method based approach in conjunction with the Viterbi algorithm to extract m-D features. For target recognition applications, mainly those in military surveillance and reconnaissance operations, micro-Doppler features have to be extracted quickly so that they can be used for real-time target identification. The S-method is computationally simple, requiring only slight modifications to the existing Fourier transform-based algorithm. The effectiveness of the S-method in extracting m-D features is demonstrated through the application to indoor and outdoor experimental data sets such as rotating fan and human gait. The Viterbi algorithm for the instantaneous frequency estimation is used to enhance the weak human micro-Doppler features in relatively high noise environments. As such, this report contributes additional experimental micro-Doppler data and analysis, which should help in developing a better picture of the human gait micro-Doppler research and its applications to indoor and outdoor imaging and automatic gait recognition systems.

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Keywords
Micro-Doppler;S-method;Viterbi;Wigner Distribution;Short-Time Fourier Transform;Human Gait;X-band Radar;Through-Wall Radar Imaging
Report Number
DRDC-OTTAWA-TM-2008-255 — Technical Memorandum
Date of publication
01 Dec 2008
Number of Pages
52
DSTKIM No
CA031830
CANDIS No
530818
Format(s):
Hardcopy

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