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:
Oct. 14, 1997
Filed:
Nov. 20, 1995
Fujitsu Limited, Kawasaki, JP;
Fujitsu Ten Limited, Kobe, JP;
Abstract
A radar apparatus for detecting a distance/velocity has a transmitting system for transmitting a signal which is frequency-modulated with a modulating signal having a predetermined recurrence frequency, a receiving system for receiving a reflected wave signal, which is the modulated transmission signal transmitted from the transmitting system and reflected by an object, and which mixes the reflected wave signal and the modulated transmission signal from the transmitting system so as to detect a beat wave signal of the reflected wave signal and the modulated transmission signal. The apparatus also includes a high-pass filter for filtering the beat wave signal detected in the receiving system so as to cut off modulation frequency components of the modulated transmission signal with orders that are equal to or lower than a predetermined order, and a distance/velocity calculating unit which calculates the distance to and the relative velocity with respect to the object based on frequency information in the beat wave signal which has been passed through the high-pass filter. Accordingly, the radar apparatus effectively removes FM/AM conversion (reconversion) noise in a simple structure thereby to accurately detect the distance to and the relative velocity with respect to the object even with low transmitting power.