18 September 1998 Bistatic radar cross-sections and time-frequency signatures of dielectrically coated targets illuminated by an electromagnetic pulse
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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.
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Hans C. Strifors, Guillermo C. Gaunaurd, "Bistatic radar cross-sections and time-frequency signatures of dielectrically coated targets illuminated by an electromagnetic pulse", Proc. SPIE 3371, Automatic Target Recognition VIII, (18 September 1998); doi: 10.1117/12.323874; https://doi.org/10.1117/12.323874
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