Cavity induced modulation of Ka-band radar signals

Anechoic chamber measurements were made of sniper rifles and surrogates from 25.0 GHz to 40.0 GHz at 5 MHz steps utilizing a stepped-frequency, horizontally linearly polarized (HH) bistatic radar. It was found that a modulation was induced on the reradiated signal when illuminating the rifles near o...

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Bibliographic Details
Published inProceedings of the 2011 IEEE National Aerospace and Electronics Conference (NAECON) pp. 222 - 227
Main Authors Hintz, K., McCaughey, D., Nasif, A.
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.07.2011
Subjects
Antenna measurements
Cavity induced modulation
Cavity resonators
Cutoff frequency
Electron tubes
Frequency measurement
Ka-band radar
Modulation
Radar
radar modeling
sniper detection
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Summary:Anechoic chamber measurements were made of sniper rifles and surrogates from 25.0 GHz to 40.0 GHz at 5 MHz steps utilizing a stepped-frequency, horizontally linearly polarized (HH) bistatic radar. It was found that a modulation was induced on the reradiated signal when illuminating the rifles near on-boresight. Further analysis of the data led to the development of a model comprised of a linear decomposition of the targets into 3 coherently summable reradiators: a long cylinder, a perforated disk, and a resonant cavity. The cavity induced modulation (CIM) which was found in the measurements can be used to locate and detect sniper rifles and other cavities. Additional measurements were made in a clutter environment at an Air Force test range at ranges up to 100 meters which confirmed the existence and detectability of the CIM.
ISBN:1457710404
9781457710407
ISSN:0547-3578
2379-2027
DOI:10.1109/NAECON.2011.6183106