Abstract: The inverse synthetic aperture radar （ISAR） echo signal model of fast-moving target and the effect of fast-moving character on ISAR signal processing are analyzed. The analysis results show that the fast-moving character will result in ISAR range profile aberration and two-dimensional image blurring. To resolve this problem, a range profile compensation algorithm based on the modified discrete Chirp-Fourier transform is proposed. In the algorithm, the spectrum envelope entropy minimizing criterion is applied for Chirp rate estimation to overcome the parameter estimation difficulty under amplitude maximum criterion. The simulation results prove the effectiveness of the proposed algorithm.

Key words: inverse synthetic aperture radar, modified discrete Chirp-Fourier transform, LFM signal, range profile