Title :
Comparison of doppler frequency rate estimators in bistatic airborne SAR and experimental results
Author :
Yinbo, Wang ; Xiaoling, Zhang ; Gong Zhenqiang ; Zhong, Tian
Author_Institution :
Univ. of Electron. Sci. & Technol. of China, Chengdu
Abstract :
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.
Keywords :
Doppler radar; Fourier transforms; airborne radar; frequency estimation; optimisation; synthetic aperture radar; Doppler frequency rate estimator; bistatic airborne SAR; contrast optimization auto focus algorithm; discrete chirp Fourier transform; magnitude-based autofocus algorithm; minimum entropy energy; synthetic aperture radar; Azimuth; Chirp; Entropy; Focusing; Fourier transforms; Frequency estimation; Optimization methods; Parameter estimation; Phase estimation; Synthetic aperture radar; Bistatic SAR; COAA; Dominant scatter; Doppler parameter estimation; MEE-DCFT;
Conference_Titel :
Synthetic Aperture Radar, 2007. APSAR 2007. 1st Asian and Pacific Conference on
Conference_Location :
Huangshan
Print_ISBN :
978-1-4244-1188-7
Electronic_ISBN :
978-1-4244-1188-7
DOI :
10.1109/APSAR.2007.4418564
