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International Journal of Antennas and Propagation
Volume 2014, Article ID 329340, 8 pages
http://dx.doi.org/10.1155/2014/329340
Research Article

An Efficient Signal Reconstruction Algorithm for Stepped Frequency MIMO-SAR in the Spotlight and Sliding Spotlight Modes

Key Laboratory for Radar Signal Processing, Xidian University, Xi’an 710071, China

Received 25 January 2014; Revised 13 June 2014; Accepted 16 June 2014; Published 26 June 2014

Academic Editor: Mathini Sellathurai

Copyright © 2014 Jiajia 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

Multiple-input multiple-output (MIMO) synthetic aperture radar (SAR) using stepped frequency (SF) waveforms enables a high two-dimensional (2D) resolution with wider imaging swath at relatively low cost. However, only the stripmap mode has been discussed for SF MIMO-SAR. This paper presents an efficient algorithm to reconstruct the signal of SF MIMO-SAR in the spotlight and sliding spotlight modes, which includes Doppler ambiguity resolving algorithm based on subaperture division and an improved frequency-domain bandwidth synthesis (FBS) method. Both simulated and constructed data are used to validate the effectiveness of the proposed algorithm.