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In recent years, the interest in bistatic synthetic aperture radar has rapidly increased and many bistatic SAR models and processing methods are presented. When regarding bistatic processing, the bistatic Doppler modulation rate is even more crucial to obtain precisely focused images. In this paper, two Doppler frequency rate estimators are analysed and compared. First, the traditional contrast optimization auto focus algorithm (COAA) is presented. The algorithm is a magnitude-based autofocus algorithm. Then, the minimum entropy energy-based discrete chirp Fourier transform (MEE-DCFT) method is proposed. The MEE-DCFT is a new method by using DCFT to estimate the chirp rate. Finally, the results of two algorithms with bistatic airborne real data are presented and compared.
Date of Conference: 5-9 Nov. 2007