Title :
Maximizing Sum of Image Intensity Square Autofocus Algorithm
Author :
Xugang, Gao ; Weimin, Su ; Hong, Gu
Author_Institution :
Sch. of Electron. Eng. & Optoelectron. Technol., Nanjing Univ. of Sci. & Technol., Nanjing, China
Abstract :
This High quality Synthetic Aperture Radar (SAR) imaging requires that azimuth frequency modulation rate is accurately estimated. A new algorithm is proposed for autofocus in synthetic aperture radar imaging. Based on image contrast, the paper analyses the relationship between maximizing sum of image intensity square and image contrast function, and maximizing sum of image intensity square autofocus algorithm is presented. Then the bisection which substitutes for advance and retreat method reduces computation. The processing results of the measured data shows better convergence speed of bisection and the validity of the proposed algorithm.
Keywords :
FM radar; optimisation; radar imaging; synthetic aperture radar; frequency modulation rate; image contrast function; image intensity square autofocus algorithm; maximization; synthetic aperture radar imaging; Algorithm design and analysis; Azimuth; Convergence; Frequency estimation; Image analysis; Marine technology; Optimization methods; Phase estimation; Radar imaging; Synthetic aperture radar;
Conference_Titel :
Innovative Computing & Communication, 2010 Intl Conf on and Information Technology & Ocean Engineering, 2010 Asia-Pacific Conf on (CICC-ITOE)
Conference_Location :
Macao
Print_ISBN :
978-1-4244-5634-5
Electronic_ISBN :
978-1-4244-5635-2
DOI :
10.1109/CICC-ITOE.2010.51