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34.6 GHz across-the-road calibrator/simulator designed and tested by NIST. (News Briefs).


Across-the-road photo radars are increasingly used for speed limit enforcement on the nations highways. During the past 10 years, NIST (National Institute of Standards & Technology, Washington, DC, www.nist.gov) The standards-defining agency of the U.S. government, formerly the National Bureau of Standards. It is one of three agencies that fall under the Technology Administration (www.technology.  has played an important role in developing new instrumentation that is to be used for type certification of these traffic radars. In February 2000, we completed an analog calibrator/simulator designed for use with K-Band (24.1 GHz) radars and demonstrated its use in calibrating a commercial Doppler radar A system for measuring speed that is based on the Doppler effect. It is used in police radar systems as well as for measuring the velocity of hurricanes and tornadoes. See Doppler effect.  to an accuracy of [+ or -] 1 mph at simulated vehicle speeds of 65 mph. NIST subsequently received further support from the National Highway Traffic Safety Administration The National Highway Traffic Safety Administration (NHTSA, often pronounced "nit-suh") is an agency of the Executive Branch of the U.S. Government, part of the Department of Transportation.  (NHTSA NHTSA National Highway Traffic Safety Administration (US government) ) through the Office of Law Enforcement Standards to develop another unit capable of calibrating similar radar systems that operate at Ka-Band (34.6 GHz). The microwave design of the 34.6 GHz calibrator calibrator

an instrument for dilating a tubular structure or for determining the caliber of such a structure.
 is identical to that of the 24 GHz calibrator, but is software driven. The flexible software controls the Doppler frequency shift and signal time duration, thereby simulating to a [+ or -] 2 % uncertaint y the radar return for different vehicles from motorcycles to trucks moving at speeds of up to 120 mph. Lab testing is complete. The units will be delivered to a NHTSA type-certification laboratory.

CONTACT: Claude Weil, (303) 497-5305; weil@boulder.nist.gov or Robert Johnk, (303) 497-3737; johnk@boulder.nist.gov or David Novotny, (303) 497-3168; novotny@boulder.nist.gov.
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Publication:Journal of Research of the National Institute of Standards and Technology
Article Type:Brief Article
Geographic Code:1USA
Date:Mar 1, 2002
Words:221
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