The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 14, 1993
Filed:
Jun. 15, 1992
Andrew G Stove, Reigate, GB;
U.S. Philips Corporation, New York, NY (US);
Abstract
An FMCW radar transmits a signal the frequency of which repeatedly sweeps upwards and downwards at a rate .alpha.. Any target returns are applied to a mixer (6) which is also supplied with a sample of the transmitted signal. During each sweep the mixer output signal is therefore a beat frequency signal the frequency components of which correspond to respective targets. The spectrum of the beat frequency signal is analysed by an FFT-calculating arrangement (16) and the result is applied to a data processor (18) which calculates the ranges of the targets. The constant of proportionality between beat frequency and range is inversely proportional to .alpha., which is subject to uncertainty. In order to resolve this uncertainty, or correct .alpha. to the required value, the velocity of a given radially moving target is calculated in two different ways: from the perceived Doppler shift and from the rate of charge of the beat frequency component due to that target, only one of these being a function of .alpha..
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile