METHOD OF CORRECTING ROTATIONAL MOTION ERROR IN SAR AND ISAR IMAGERY

Abstract

A method of correcting rotational motion error in SAR and ISAR imagery includes shifting the center of the image to zero doppler and thus to the center of rotation of the target being imaged, selecting a dominant scatterer at an off-center range cell to provide a phase reference, calculating the rotational motion error function from the phase of the selected scatterer, using the rotational motion error function to interpolate raw radar return image data between the original unequal angular samples to obtain equal angular samples of the target reflectivity function, and performing an image quality check and producing a value which is a relative measure of focus of the image. Also, the method includes repeating the steps starting with selecting a new dominant scatterer as a phase reference. Further, the performing step of the method includes storing and comparing the relative measures of focus provided by repeating of the steps to arrive at the corrected image which is the most focused and then saving the corrected image determined to be the the most focused.

Source: Google Patents

35 USC §181 Secrecy Order

Inventor

• 1DUANE ROTH

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