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International Journal of Antennas and Propagation
Volume 2015 (2015), Article ID 629506, 10 pages
http://dx.doi.org/10.1155/2015/629506
Research Article

MIMO SAR Using Orthogonal Coding: Design, Performance Analysis, and Verifications

1National Disaster Reduction Center of China, MCA, Beijing 100124, China
2Key Laboratory of Disaster Reduction and Emergency Response Engineering of the MCA, Beijing 100124, China
3Institute of Electronics, Chinese Academy of Sciences, Beijing 100190, China
4Marine Acoustics and Remote Sensing Laboratory, Zhejiang Ocean University, Zhoushan 316000, China

Received 11 March 2015; Accepted 12 May 2015

Academic Editor: Giuseppe Mazzarella

Copyright © 2015 Yueguan Lin 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

Multiple-input multiple-output (MIMO) synthetic aperture radar (SAR) is a promising technology in radar imaging which provides a better balance of azimuth resolution and swath width compared with traditional single-input single-output (SISO) SAR. It has the potential to help scientists and engineers to design ambitious SAR system with higher resolution and wider swath. This paper studies the principle of MIMO SAR using orthogonal coding waveform and then provides the performance analysis in resolution and swath width. By using orthogonal coding waveform, lower channel interference is obtained, which makes MIMO SAR achieve wider unambiguous range swath and lower azimuth ambiguity. Simulations are carried out by means of the system parameters of real spaceborne SAR platform. A ground-based MIMO SAR imaging system with up and down chirp modulation is also designed. The performances of MIMO SAR and SISO SAR are compared, and the validity and advantage of MIMO SAR are verified.