Title :
SAR autofocus based on the instantaneous frequency estimation
Author :
Li, Xue Mei ; Tao, Ran ; Li, Yan Lei
Author_Institution :
Sch. of Inf. & Electron., Beijing Inst. of Technol., Beijing, China
Abstract :
A new autofocus method for synthetic aperture radar (SAR) application is proposed based on the instantaneous frequency estimation. The short-time Fourier transform (STFT) is utilized to estimate the instantaneous frequency. Then the PGA technique is applied with single iteration. The proposed method can perform well in lower signal-to-noise ratio (SNR) and it needs less computation cost than the conventional PGA technique. Simulation results demonstrate the validity of the proposed approach.
Keywords :
Fourier transforms; frequency estimation; radar imaging; synthetic aperture radar; PGA technique; SAR autofocus; instantaneous frequency estimation; short-time Fourier transform; signal-to-noise ratio; single iteration; synthetic aperture radar application; Computational modeling; Electronics packaging; Filtering; Fourier transforms; Frequency estimation; Phase estimation; Radio access networks; Signal to noise ratio; Spaceborne radar; Synthetic aperture radar; autofocus; instantaneous frequency estimation; synthetic aperture radar (SAR);
Conference_Titel :
Synthetic Aperture Radar, 2009. APSAR 2009. 2nd Asian-Pacific Conference on
Conference_Location :
Xian, Shanxi
Print_ISBN :
978-1-4244-2731-4
Electronic_ISBN :
978-1-4244-2732-1
DOI :
10.1109/APSAR.2009.5374293
