Application of Joint Time-Frequency Representations to a Maneuvering Air Target in Sea-Clutter: Analysis Beyond FFT

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Authors
  1. Thayaparan, T.
  2. Kennedy, S.
Corporate Authors
Defence R&D Canada - Ottawa, Ottawa ONT (CAN);Carleton Univ, Ottawa ONT (CAN)
Abstract
Traditionally, radar signals have been analysed in either the time or the frequency domain. Joint time-frequency representations characterize signals over a time-frequency plane. They thus combine time-domain and frequency-domain analyses to yield a potentially more revealing picture of the temporal localization of a signal’s spectral components. Therefore, for air target returns with time-varying frequency content, the joint time-frequency representations offer a powerful analysis tool. A concise review of time-frequency transforms is provided as background and is needed to appreciate how time-frequency processing methods can improve conventional time or frequency processing m ethods. The report then describes and illustrates the advantages of using joint time-frequency techniques to analyze a multi-component signal, a noisy signal, and experimental aircraft data. Finally, we use time-frequency analysis techniques for the detection of maneuvering aircraft using HF radar in heavily cluttered regions. We compare the ability of different time-frequency transforms to resolve several experimental aircraft returns. The results clearly demonstrate that time-frequency analysis techniques can significantly improve the detection performance of the HF radar and add considerable physical insight over what can be achieved by conventional Fourier transform methods currently used by HF radars.

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Keywords
Doppler Smearing;Gabor Representation;Spectrogram;Wigner Ville Distribution;Reassigned Spectrogram;Adaptive Energy Distribution;HFSWR (High Frequency Surface Wave Radar);Gabor transformation;Wavelet transform;Time frequency distributions
Report Number
DRDC-OTTAWA-TM-2003-090 — Technical Memorandum
Date of publication
01 Mar 2003
Number of Pages
52
DSTKIM No
CA022710
CANDIS No
519705
Format(s):
Hardcopy;CD ROM

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