Micro-Doppler Radar Signatures for Intelligent Target Recognition

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Authors
  1. Thayaparan, S.
  2. Abrol, S.
  3. Riseborough, E.
Corporate Authors
Defence R&D Canada - Ottawa, Ottawa ONT (CAN);Ottawa Univ, Ottawa ONT (CAN)
Abstract
Mechanical vibrations or rotations (micro-motion dynamics) of structures on a target may introduce frequency modulation on the radar return from the target’s body. The modulation due to this vibration or rotation is referred to as the micro-Doppler (m-D) phenomenon. In this report, the m-D effect is introduced and the mathematics of micro-Doppler signatures, induced by simple sinusoidal vibrations or rotations, is developed. Simulated results confirm that the mathematical analysis is valid. The m-D features derived from a target’s vibrational/rotational motion are extracted by utilizing discrete wavelet transforms. During this process, the time domain radar signal is decomposed into a set of components that are represented by different wavelet scales. The m-D features are extracted by sorting the components that are associated with the vibrational/rotational motions of a target and is achieved by applying the inverse wavelet transform. After the extraction of m-D features, time-frequency analysis is employed to analyze the oscillation and to estimate the motion parameters. The vibration/rotation rate is estimated by taking the autocorrelation of the time sequence data. The findings show that these results have higher precision after the m-D extraction since only vibrational/rotational components are employed. The proposed method of the m-D extraction has been successfully applied to both simulated data and experimental helicopter and human data. The preliminary results cl

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Keywords
Micro-Doppler;Feature Extraction;Microwave radar;Automatic Target Recognition;Automatic Gait Recognition;Human Gait;Time-Frequency Distribution;High Range Resolution;Fourier Transform;Doppler Smearing;Wavelets
Report Number
DRDC-OTTAWA-TM-2004-170 — Technical Memorandum
Date of publication
01 Sep 2004
Number of Pages
78
DSTKIM No
CA024755
CANDIS No
522347
Format(s):
Hardcopy;CD ROM

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