ISAR APPARATUS FOR AUTOFOCUSING AND CROSS RANGE SCALING OF ISAR IMAGE USING COMPRESSIVE SENSING AND METHOD THEREOF

摘要

The present invention relates to a device and method for auto-focusing and vertical distance scaling of an ISAR image using compression sensing. According to the present invention, the method comprises the steps of: receiving a sparse-aperture (SA) signal for a target; using a residual signal of a scattering point included in a distance bin and a Pearson′s correlation coefficient among previously stored sensing matrixes by each distance bin of the SA signal to estimate coordinates and a parameter in accordance with translation and irregular rotation with respect to the scattering point, and calculating an amplitude corresponding to the parameter; using the estimated parameter and the calculated amplitude to reconfigure an ISAR image signal corresponding to the SA signal; using the reconfigured ISAR image signal to remove a signal component corresponding to the translation and the irregular rotation, and generating an ISAR image auto-focused through Fourier transform; and using an angular velocity of a target calculated through the estimated parameter to calculate a vertical distance resolution, and scaling a vertical distance of the generated ISAR image in accordance with the vertical distance resolution. Accordingly, the present invention can restore an SA signal into a complete ISAR image signal from which a phase error signal in accordance with translation and irregular rotation motions of a target is removed.