Title :
Research on nonlinearity correction imaging algorithm of FMCW SAR
Author :
Ying, Wang ; Qingshan, Li ; Deyun, Gan ; Guangyong, Zheng
Author_Institution :
Unit 63891 People´´s Liberation Army, Unit 63891 PLA, Luoyang, China
Abstract :
The frequency modulated continuous wave synthetic aperture radar (FMCW SAR) is a newly proposed radar imaging system, which combines FMCW technique with synthetic aperture imaging methods and has the advantages such as small cubage, light weight, cost-efficient, highresolution, etc. In practical SAR system, the frequency and time of the frequency modulated signal can´t keep linearity absolutely. The effects of nonlinear frequency modulation on range resolution and FMCW SAR imaging are analyzed. A method of polynomial fit is proposed in order to estimate the nonlinearity of the frequency modulated signal, and the nonlinearity is corrected. Nonlinear FMCW SAR imaging algorithm is researched. Then the simulation results are presented. The results show that this method is valid.
Keywords :
CW radar; FM radar; radar imaging; synthetic aperture radar; FMCW SAR imaging algorithm; frequency modulated continuous wave synthetic aperture radar; frequency modulated signal; nonlinear frequency modulation; nonlinearity correction imaging algorithm; radar imaging system; synthetic aperture imaging; Azimuth; Frequency modulation; Linearity; Radar imaging; Signal resolution; Synthetic aperture radar; Time frequency analysis; frequency modulated continuous wave (FMCW); nonlinearity; polynomial fit; synthetic aperture radar (SAR);
Conference_Titel :
Signal Processing Systems (ICSPS), 2010 2nd International Conference on
Conference_Location :
Dalian
Print_ISBN :
978-1-4244-6892-8
Electronic_ISBN :
978-1-4244-6893-5
DOI :
10.1109/ICSPS.2010.5555530
