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International Journal of Antennas and Propagation
Volume 2011, Article ID 937261, 8 pages
Research Article

An External Calibration Method for Compensating for the Mutual Coupling Effect in Large Interferometric Aperture Synthesis Radiometers

1School of Information Science and Engineering, Central South University, Changsha 410083, China
2Department of Electronics and Information Engineering, Huazhong University of Science and Technology, Wuhan 430074, China

Received 30 May 2011; Revised 25 July 2011; Accepted 26 July 2011

Academic Editor: Hon Tat Hui

Copyright © 2011 Jian Dong 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.


This paper deals with the antenna mutual coupling effect in interferometric aperture synthesis radiometers (IASRs), which degrades the system radiometric performance. First, the conventional mutual impedance (CMI) is adopted to analyze the mutual coupling effect on the performance of IASR and a practical model of the coupled visibilities is developed. Based on the model, an external calibration method is then proposed to compensate for the mutual coupling effect. In this method, the measured visibilities are decoupled through the difference measurement between the original scene and a naturally occurring reference scene. Compared to the previous methods, the proposed method requires no extra additional hardware cost and has easier implementation and, therefore, fits for the large interferometric array radiometers. Experimental results validate the effectiveness of the proposed method.