Due to the diffraction limitation, images acquired from the electromagnetic distribution detection are blurred by a parabolic reflector imaging system and super-resolution algorithm is thus needed to improve the resolution. By using an effective algorithm, the point spread function (PSF) can be obtained as a function of frequency, however, the frequency of electromagnetic source distributions are rarely known. Therefore, this paper presents a method of estimating the frequency of electromagnetic source distribution by establishing the corresponding relationship between estimated PSF via the blind deconvolution super-resolution algorithm and frequency. And then we can determine the PSF with the estimated frequency and restore the image via L_R iterative algorithm. Experimental results show that the proposed method can effectively estimate the PSF of the wideband electromagnetic source distribution and improve the resolution of the blurred image.
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