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In highly squinted synthetic aperture radar (SAR) motion compensation, the map-drift (MD) algorithm cannot estimate the Doppler chirp rate accurately when the range walk is compensated in the azimuthal time domain. This problem stems from the influence of the azimuthal position-dependent (i.e., space-variant) phases, which are introduced by the compensation of the range walk in the azimuthal time...
An instantaneous rotation rate (IRR) estimation algorithm based on the chirp rate of the scattering centre in the same Doppler cell is proposed to complete the cross-range scaling of the RID ISAR images.
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