Performance comparison of modified Range Doppler Algorithm in factual applications

Performance comparison of modified Range Doppler Algorithm in factual applications



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    Synthetic aperture radar is an active remote sensing
    approach that transmits the known wavelength signal and measures the
    reflected wave from the scene. Moving target detection, imaging, and
    velocity estimation using raw data are active research fields with
    civilian and military applications. The synthetic aperture radar endures
    from the image degradation because of phase errors present in the
    received signal. These phase errors give rise to poor focus quality,
    spurious targets, loss of resolution and erroneous velocities. The
    primary objective of the paper is to produce a high-resolution image of
    the targets and the moving targets motion estimation present in the
    scene in the presence of phase errors. The modified range-Doppler
    algorithm performs the range migration correction and the focus
    filtering with the wavelet decomposition to improve the resolution of
    the target image. The parameters extracted from the range migration
    correction and azimuth filtering is used to estimate the moving target
    velocity. The modified RDA using Sym8 wavelet decomposition levels
    with AOPM for moving target velocity estimation of SAR image have
    the average percentage of accuracy is 1.99. This proposed RDA method
    gives the close approximation to the actual velocity value and also
    improves the focus quality of the target image when compared with the
    conventional RDA.
    Keywords: Synthetic aperture radar, Range Doppler algorithm, Wavelet
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    Performance comparison of modified Range Doppler Algorithm in factual applications