Title :
A motion compensation approach integrated in the omega-K algorithm for airborne SAR
Author :
Li, Yan-lei ; Liang, Xing-dong ; Ding, Chi-biao ; Zhou, Liang-jiang ; Chen, Long-yong ; Hong, Wen
Author_Institution :
Sch. of Inf. Eng., Grad. Univ. of Chinese Acad. of Sci., Beijing, China
Abstract :
The omega-K algorithm has been considered unable to be combined with high-precision motion compensation (MoCo). An extended omega-K (EOK) algorithm was proposed in which the two-step MoCo could be integrated. However, the second-order MoCo is inaccurate due to the wavelength-dependent scaling of the azimuth signal after the modified Stolt mapping. Although a third-step MoCo was introduced to make up for this drawback, it is limited in dealing with high-frequency motion errors because it is applied block-wise in the time domain. A MoCo approach is proposed in this paper integrated in the traditional omega-K algorithm, which implements the aperture-dependent second-order MoCo after the range compression and before the Stolt mapping. Theoretical analysis and simulation verifies its validity.
Keywords :
airborne radar; motion compensation; radar imaging; synthetic aperture radar; airborne SAR; azimuth signal; extended omega-K algorithm; high-frequency motion errors; high-precision motion compensation; modified Stolt mapping; second-order MoCo; third-step MoCo; time domain; two-step MoCo; wavelength-dependent scaling; Azimuth; Doppler effect; Motion compensation; Synthetic aperture radar; Time domain analysis; Time frequency analysis; motion compensation (MoCo); omega-K algorithm; range cell migration correction (RCMC);
Conference_Titel :
Imaging Systems and Techniques (IST), 2012 IEEE International Conference on
Conference_Location :
Manchester
Print_ISBN :
978-1-4577-1776-5
DOI :
10.1109/IST.2012.6295560
