The present invention relates to an apparatus to scale an inverse synthetic aperture radar image in a crossing direction using principal component analysis (PCA); and a method thereof. According to the present invention, the method comprises: a step of acquiring a first inverse synthetic aperture radar image of a first time point and a second inverse synthetic aperture radar image of a second time point later than the first time point; a step of extracting scattering points indicating a shape of an object from the first and second inverse synthetic aperture radar images; a step of calculating a main axis of each image having maximum dispersion for the scattering points through PCA using the extracted scattering points of the first and second inverse synthetic aperture radar images; a step of using the extracted main axis of each image to estimate a rotational speed of the object; and a step of using the estimated rotational speed to change a scale in a crossing direction of the first and second inverse synthetic aperture radar images into a length dimension. As such, a crossing distance direction of the inverse synthetic aperture radar image is able to be scaled into a meter unit from a hertz unit without information about a rotational center of the object, therethrough being able to improve a calculation speed and precision of scaling in comparison with an existing scaling technique.;COPYRIGHT KIPO 2017
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