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Abstract: In this paper, ISAR imaging for a wide repeat range is figured out, by using a proposed methodology known as Modified Fast Chirp Fourier Transform (MFCFT). Radar imaging is generally acted in the L, S and C band repeat, going from 1-8 GHz. However, a portion of the time it becomes essential to picture an objective in wideband repeat i.e., from 1-40GHz region. Here, in this paper, ISAR imaging is done for wideband (1-40GHz) frequencies. While imaging is done here of frequencies, the major methodologies like RD and RID fails to recreate pictures for this impressive range, however the proposed system mirrors pictures with significant standard.