Table of Contents
ISRN Signal Processing
Volume 2014, Article ID 987803, 8 pages
http://dx.doi.org/10.1155/2014/987803
Research Article

Radar Coincidence Imaging under Grid Mismatch

School of Electronic Science and Engineering, National University of Defense Technology, Changsha 410073, China

Received 6 January 2014; Accepted 28 January 2014; Published 22 April 2014

Academic Editors: I. Buciu and B. K. Gunturk

Copyright © 2014 Dongze Li et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Radar coincidence imaging is an instantaneous imaging technique which does not depend on the relative motion between targets and radars. High-resolution, fine-quality images can be obtained using a single pulse either for stationary targets or for complexly maneuvering ones. There are two image-reconstruction algorithms used for radar coincidence imaging, that is, the correlation method and the parameterized method. In comparison with the former, the parameterized method can achieve much higher resolution but is seriously sensitive to grid mismatch. In the presence of grid mismatch, neither of the two algorithms can obtain recognizable high-resolution images. The above problem largely limits the applicability of radar coincidence imaging in actual imaging scenes where grid mismatch generally exists. This paper proposes a joint correlation-parameterization algorithm, which uses the correlation method to estimate the grid-mismatch error and then iteratively modifies the results of the parameterized method. The proposed algorithm can achieve high resolution with fine imagery quality under the grid mismatch. Examples are provided to illustrate the improvement of the proposed method.