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Mathematical Problems in Engineering
Volume 2014, Article ID 859890, 10 pages
Research Article

Signal Processing for Digital Beamforming FMCW SAR

1College of Electronic Science and Engineering, National University of Defense Technology, ChangSha, Hunan 410073, China
2School of Biomedical Engineering, Third Military Medical University, Chongqing 400038, China

Received 10 November 2013; Revised 3 March 2014; Accepted 17 March 2014; Published 15 April 2014

Academic Editor: Gianluca Ranzi

Copyright © 2014 Qin Xin 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.


According to the limitations of single channel Frequency Modulation Continuous Wave (FMCW) Synthetic Aperture Radar (SAR), Digital Beamforming (DBF) technology is introduced to improve system performance. Combined with multiple receive apertures, DBF FMCW SAR can obtain high resolution in low pulse repetition frequency, which can increase the processing gain and decrease the sampling frequency. The received signal model of DBF FMCW SAR is derived. The continuous antenna motion which is the main characteristic of FMCW SAR received signal is taken into account in the whole signal processing. The detailed imaging diagram of DBF FMCW SAR is given. A reference system is also demonstrated in the paper by comparing with a single channel FMCW SAR. The validity of the presented diagram is demonstrated with a point target simulation results.