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Proceedings Paper

Bistatic radar cross-sections and time-frequency signatures of dielectrically coated targets illuminated by an electromagnetic pulse
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Paper Abstract

Identification is one of the main goals for processing echoes returned by various radar-illuminated targets. The conventional way to process radar echoes is to analyze them in the frequency domain or in the time domain. A third, more recent and seemingly more advantageous way is to use schemes in the combined time-frequency domain. We show the effect of using a pseudo-Wigner distribution (PWD) for processing bistatically scattered echoes from a few simple targets when these are illuminated by short, ultra-wideband pulses that an impulse radar could be designed to send and receive. The targets are spheres, either a perfectly conducting sphere or the same sphere coated with a thin dielectric layer. Two different, hypothetical materials are specified: a non- magnetic lossy dielectric and a dielectric that also has magnetic losses. For each target two different polarizations are selected and the corresponding bistatic radar cross- section (RCS) is displayed as a function of frequency and bistatic angle. Analyzing the scattered waveform when the designed short pulse is incident on each target for a few selected bistatic angles gives information of how and how much bistatically scattered pulses are affected by a target coating. Although reducing the bistatic RCSs of a target, the coating could introduce additional resonance features in the target's signatures, at low frequencies where the coating is not effective, that could be used for target recognition purposes.

Paper Details

Date Published: 18 September 1998
PDF: 11 pages
Proc. SPIE 3371, Automatic Target Recognition VIII, (18 September 1998); doi: 10.1117/12.323874
Show Author Affiliations
Hans C. Strifors, Swedish Defense Research Establishment (Sweden)
Guillermo C. Gaunaurd, Naval Surface Warfare Ctr. (United States)

Published in SPIE Proceedings Vol. 3371:
Automatic Target Recognition VIII
Firooz A. Sadjadi, Editor(s)

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