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International Journal of Antennas and Propagation
Volume 2014, Article ID 798673, 7 pages
http://dx.doi.org/10.1155/2014/798673
Research Article

Channel Phase Error Compensation for MIMO-SAR

1Department of Spaceborne Microwave Remote Sensing System, Institute of Electronics, Chinese Academy of Sciences, Beijing 100190, China
2University of Chinese Academy of Sciences, Chinese Academy of Sciences, Beijing 100190, China

Received 27 February 2014; Accepted 2 June 2014; Published 22 June 2014

Academic Editor: Wen-Qin Wang

Copyright © 2014 Lei Zhang 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

Multi-input multioutput (MIMO) is a novel technique to achieve high-resolution as well as wide swath in synthetic aperture radar (SAR) systems. Channel imbalance is inevitable in multichannel systems that it declines the imaging quality. Generally, the imbalance cannot be fully compensated by simple internal calibration in a MIMO-SAR system. In this paper, a new algorithm based on raw data is presented to remove the channel phase error. Based on the error source, this approach models the phase error as two parts: the transmit phase error and the receive phase error. The receive phase error is removed using cost function at the azimuth processing stage, whereas the transmit phase error is estimated with correlation. Point target simulations confirm the influence of channel phase error and the validation of the proposed approach. Besides, the performance is also investigated.