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Proceedings Paper

Synthetic aperture hitchhiker imaging using non-cooperative sources of opportunity
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Paper Abstract

A hitchhiker is a passive radar receiver that relies on sources of opportunity to perform radar tasks.1-4 In this paper, we consider a synthetic-aperture radar (SAR) system with static non-cooperative transmitters and mobile receivers traversing arbitrary trajectories and present an analytic image formation method. Due to its combined synthetic aperture and hitchhiking structure, we refer to the system under consideration as synthetic aperture hitchhiker (SAH). Our approach is applicable to cooperative and/or non-cooperative and static and/or mobile sources of opportunity. Conventional SAR processing involves correlation of the received signal from a receiver with the transmitted waveform as a first step of the image formation. For passive SAR, however, the transmitted waveform is not necessarily known. Instead, we use spatio-temporal correlation of received signals. Given a pair of receivers, the spatio-temporal correlation method compares the received signals to identify a target within the illuminated scene. We combine this with microlocal techniques to develop a filtered backprojection (FBP) type inversion method for passive SAR5. Combined correlation-FBP inversion method does not require the knowledge of the transmitter locations. Furthermore, FBP inversion has the advantage of computational efficiency and image formation under non-ideal conditions, such as arbitrary flight trajectories and non-flat topography.

Paper Details

Date Published: 7 May 2007
PDF: 9 pages
Proc. SPIE 6568, Algorithms for Synthetic Aperture Radar Imagery XIV, 656806 (7 May 2007); doi: 10.1117/12.719660
Show Author Affiliations
Can Evren Yarman, Rensselaer Polytechnic Institute (United States)
Birsen Yazıcı, Rensselaer Polytechnic Institute (United States)
Margaret Cheney, Rensselaer Polytechnic Institute (United States)

Published in SPIE Proceedings Vol. 6568:
Algorithms for Synthetic Aperture Radar Imagery XIV
Edmund G. Zelnio; Frederick D. Garber, Editor(s)

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