| タイトル | Fast, High-Resolution Terahertz Radar Imaging at 25 Meters |
| 著者（英） | Dengler, Robert J.; Cooper, Ken B.; Llombart, Nuria; Talukder, Ashit; Panangadan, Anand V.; Siegel, Peter H.; Peay, Chris S. |
| 発行日 | 2010-04-05 |
| 言語 | eng |
| 内容記述 | We report improvements in the scanning speed and standoff range of an ultra-wide bandwidth terahertz (THz) imaging radar for person-borne concealed object detection. Fast beam scanning of the single-transceiver radar is accomplished by rapidly deflecting a flat, light-weight subreflector in a confocal Gregorian optical geometry. With RF back-end improvements also implemented, the radar imaging rate has increased by a factor of about 30 compared to that achieved previously in a 4 m standoff prototype instrument. In addition, a new 100 cm diameter ellipsoidal aluminum reflector yields beam spot diameters of approximately 1 cm over a 50x50 cm field of view at a range of 25 m, although some aberrations are observed that probably arise from misaligned optics. Through-clothes images of a concealed threat at 25 m range, acquired in 5 seconds, are presented, and the impact of reduced signal-to-noise from an even faster frame rate is analyzed. These results inform the system requirements for eventually achieving sub-second or video-rate THz radar imaging. |
| NASA分類 | Communications and Radar |
| 権利 | Copyright |
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