Computer Science
Scientific paper
Jul 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993spie.1874..155h&link_type=abstract
Proc. SPIE Vol. 1874, p. 155-159, Infrared and Millimeter-Wave Engineering, Harold T. Buscher; Ed.
Computer Science
Scientific paper
A miniature millimeter-wave tracking sensor has been developed that can provide small- diameter hypervelocity missiles with the ability to acquire and track ground mobile and airborne military threats. It has adequate power to acquire small targets at beyond one kilometer range, sufficiently low sidelobes to suppress clutter and countermeasures, and a sufficiently deep tracking null for high angular accuracy. A five-port monopulse unit, the sensor is 1.7 inches (43 mm) in diameter and weighs only 120 grams. It consists of a 94 GHz hybrid-integrated frequency-modulated continuous wave (FMCW) transceiver and a dielectric lens antenna. The transceiver, which consists of Gunn Transmitter, circulator, three mixers, three couplers, and two comparators (azimuth and elevation), is built on three thin quartz substrates. Integral with it is a cluster of five dielectric monopulse feeds. The transmitter generates more than 60 milliwatts of average power which is linearly modulated over a period of one millisecond. The modulation is sufficiently linear to permit range resolutions as high as 30 centimeters. When the sensor was tested, its beamwidth was measured at 4 degrees. Also, its sum channel sidelobes are 39 dB below the level of the main beam, and its difference null depth is 44 dB.
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