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Sensors 2015, 15(12), 32123-32137; doi:10.3390/s151229910

Focusing Bistatic FMCW SAR Signal by Range Migration Algorithm Based on Fresnel Approximation

Faculty of Engineering and Applied Science, Memorial University of Newfoundland, 230 Elizabeth Avenue, St. John’s, NL A1C5S7, Canada
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Author to whom correspondence should be addressed.
Academic Editor: Daniele Riccio
Received: 21 September 2015 / Revised: 15 December 2015 / Accepted: 17 December 2015 / Published: 21 December 2015
(This article belongs to the Section Remote Sensors)
View Full-Text   |   Download PDF [2732 KB, uploaded 21 December 2015]   |  

Abstract

Frequency modulated continuous wave (FMCW) technique has recently been employed by synthetic aperture radar (SAR) to decrease the radar cost and volume. However, the operation range is limited by the direct energy leakage from the transmitting channel to receiving channel due to the operation principle of FMCW technique. Bistatic configuration is an efficient way to increase the isolation between the transmitter and receiver, which could significantly increase the radar standoff range. A bistatic FMCW SAR spectrum model is proposed by using the Fresnel approximation in this paper. This model is similar to that of a monostatic FMCW SAR spectrum, which allows the existing imaging algorithms to be used on bistatic image processing. Based on the new model and the characteristics of FMCW signal, a modified range migration algorithm (RMA) for FMCW SAR is proposed to focus the image, which requires less memory and computational load than the traditional RMA. Point-target simulation is used to verify the proposed spectral model and real data processing verified the effectiveness of the proposed RMA. View Full-Text
Keywords: bistatic FMCW SAR; SAR signal spectrum; range migration algorithm bistatic FMCW SAR; SAR signal spectrum; range migration algorithm
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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, Y.; O’Young, S. Focusing Bistatic FMCW SAR Signal by Range Migration Algorithm Based on Fresnel Approximation. Sensors 2015, 15, 32123-32137.

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