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:
Mar. 13, 1990
Filed:
Jul. 07, 1981
Ernest R Cashen, Shepton Mallet, GB;
Peter A Holder, Bristol, GB;
E M I Limited, Hayes, GB;
Abstract
A radar apparatus transmits a pulse and receives a corresponding return within the duration of the transmitted pulse. The returned pulse and a proportion of the energy of the transmitted pulse are mixed in a mixer to produce a demodulated pulse of duration equal to the overlap in time of the transmitted and received pulses. In order to render the apparatus insensitive to close targets a video gate prevents the portion of the demodulated pulse corresponding to e.g. 0 to 1/4 full range passing to a processing circuit. The processing circuit forms the ratio of the amplitudes of two frequency components of the spectrum of the demodulated pulse as a measure of range (FIG. 3) or forms the mean amplitude of the demodulated pulse weighted according to a weighting function (FIG. 4).