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Sensors 2015, 15(11), 27611-27624; doi:10.3390/s151127611

Sparse Auto-Calibration for Radar Coincidence Imaging with Gain-Phase Errors

School of Electronic Science and Engineering, National University of Defense Technology, Changsha 410073, China
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Author to whom correspondence should be addressed.
Academic Editor: Assefa M. Melesse
Received: 27 July 2015 / Revised: 18 October 2015 / Accepted: 26 October 2015 / Published: 30 October 2015
(This article belongs to the Section Remote Sensors)
View Full-Text   |   Download PDF [1012 KB, uploaded 30 October 2015]   |  

Abstract

Radar coincidence imaging (RCI) is a high-resolution staring imaging technique without the limitation of relative motion between target and radar. The sparsity-driven approaches are commonly used in RCI, while the prior knowledge of imaging models needs to be known accurately. However, as one of the major model errors, the gain-phase error exists generally, and may cause inaccuracies of the model and defocus the image. In the present report, the sparse auto-calibration method is proposed to compensate the gain-phase error in RCI. The method can determine the gain-phase error as part of the imaging process. It uses an iterative algorithm, which cycles through steps of target reconstruction and gain-phase error estimation, where orthogonal matching pursuit (OMP) and Newton’s method are used, respectively. Simulation results show that the proposed method can improve the imaging quality significantly and estimate the gain-phase error accurately. View Full-Text
Keywords: radar coincidence imaging (RCI); sparse recovery; orthogonal matching pursuit (OMP); gain-phase error; auto-calibration radar coincidence imaging (RCI); sparse recovery; orthogonal matching pursuit (OMP); gain-phase error; auto-calibration
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. (CC BY 4.0).

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MDPI and ACS Style

Zhou, X.; Wang, H.; Cheng, Y.; Qin, Y. Sparse Auto-Calibration for Radar Coincidence Imaging with Gain-Phase Errors. Sensors 2015, 15, 27611-27624.

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