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Sensors 2015, 15(7), 15339-15362; doi:10.3390/s150715339

A Synthetic Bandwidth Method for High-Resolution SAR Based on PGA in the Range Dimension

1
School of Electronic and Information Engineering, Beihang University, Beijing 100191, China
2
Electronic and Electronic Engineering Department, University of Sheffield, Sheffield S1-3JD, UK
*
Author to whom correspondence should be addressed.
Academic Editor: Assefa M. Melesse
Received: 17 May 2015 / Revised: 17 June 2015 / Accepted: 23 June 2015 / Published: 29 June 2015
(This article belongs to the Section Remote Sensors)
View Full-Text   |   Download PDF [4493 KB, uploaded 29 June 2015]   |  

Abstract

The synthetic bandwidth technique is an effective method to achieve ultra-high range resolution in an SAR system. There are mainly two challenges in its implementation. The first one is the estimation and compensation of system errors, such as the timing deviation and the amplitude-phase error. Due to precision limitation of the radar instrument, construction of the sub-band signals becomes much more complicated with these errors. The second challenge lies in the combination method, that is how to fit the sub-band signals together into a much wider bandwidth. In this paper, a novel synthetic bandwidth approach is presented. It considers two main errors of the multi-sub-band SAR system and compensates them by a two-order PGA (phase gradient auto-focus)-based method, named TRPGA. Furthermore, an improved cut-paste method is proposed to combine the signals in the frequency domain. It exploits the redundancy of errors and requires only a limited amount of data in the azimuth direction for error estimation. Moreover, the up-sampling operation can be avoided in the combination process. Imaging results based on both simulated and real data are presented to validate the proposed approach. View Full-Text
Keywords: synthetic bandwidth; synthetic aperture radar (SAR); ultra-high range resolution synthetic bandwidth; synthetic aperture radar (SAR); ultra-high range resolution
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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. (CC BY 4.0).

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Li, J.; Chen, J.; Liu, W.; Wang, P.; Li, C. A Synthetic Bandwidth Method for High-Resolution SAR Based on PGA in the Range Dimension. Sensors 2015, 15, 15339-15362.

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