Motion Error Correction Scheme Using the Spatial Doppler Characteristics of the In-Scene Target in the SAR Imaging System


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The success of target reconstruction in the SAR(Synthetic Aperture Radar) imaging system is greatly dependent on coherent detection. Incoherent detection appears as a multiplicative phase error to echoed signal, which consequently causes fatal degradations such as fading or dislocation of target image. In this paper, we propose a motion error correction scheme using an in-scene target to compensate for relative distance error between the radar and the target. We start by modeling from a wave equation for one point target, and then derive the complex motion error from extended overall echoed data. The proposed algorithm is also good for the correction of relatively large motion error because it can be applied repeatedly, and it is converged after each iteration. We use the spatial Doppler characteristics of the strong in-scene target to retrieve motion error, thus, we only used the partial spectral echo data corresponding to the strong in-scene target. By doing this, we can reduce computational loads and the number of iterations for the large motion error. We verify the performance of the proposed algorithm by applying it to the simulated spotlight-mode SAR data.



Key Engineering Materials (Volumes 277-279)

Edited by:

Kwang Hwa Chung, Yong Hyeon Shin, Sue-Nie Park, Hyun Sook Cho, Soon-Ae Yoo, Byung Joo Min, Hyo-Suk Lim and Kyung Hwa Yoo




J. H. Choi and E. J. Kim, "Motion Error Correction Scheme Using the Spatial Doppler Characteristics of the In-Scene Target in the SAR Imaging System ", Key Engineering Materials, Vols. 277-279, pp. 247-253, 2005

Online since:

January 2005




[1] Mehrdad Soumekh, Synthetic Aperture Radar Signal Processing with Matlab Algorithms, (1999).

[2] Hyung-Joo Kim, Jeong-Hee Choi, The Estimation of First Order Derivative Phase Error Using Iterative Algorithm In SAR Imaging System, Proc, Korean society of Remote Sensing, International Symposium on Remote Sensing, pp.112-117, Nov. (2000).

[3] M. Soumekh, Phase reconstruction/unwrapping from amplitude for diffracted waves using a perturbation solution of the wave equation, IEEE Trans. on Acoustics, Speech and Signal Processing, 36, p.1076.


[4] Mehrdad Soumekh, Jeong-Hee Choi, Phase and Amplitude Phase Restoration in Synthetic Aperture Radar Imaging, IEEE Transactions on image processing, vol. 1, no 2. April (1992).


[5] M. Soumekh, A system model and inversion for synthetic aperture radar imaging", Proc, ICASSP, 90, Albuquerque, April (1990).

[6] P.H. Eichel and C.V. Jakovatz Jr, Phase gradient algorithm as an optimal estimator of the phase derivative, Vol. 14, No. 20 Optic letters (1989).