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:
Sep. 30, 2008
Filed:
Jun. 15, 2005
Nobukazu Shima, Kobe, JP;
Nobukazu Shima, Kobe, JP;
Fujitsu Ten Limited, Hyogo, JP;
Abstract
A radar apparatus includes a plurality of receiver circuit systems to correspond with a plurality of receiving antennas. Channel signals having the same characteristics are generated by the switching operation of a second switch from a received channel signal received by an antenna selected by a first switch, and the thus generated signals are input to the respective receiver circuit systems. Any change in characteristic is detected by comparing signal level and phase between the channel signals converted from analog to digital. The characteristic of each receiver circuit system or the characteristic of each A-D converted output signal is corrected based on the result of the detection of each receiver circuit system. Any change detected in the characteristic of a receiver circuit system is corrected during normal operation, and any change occurring in the characteristic due to aging or temperature variations in the operating environment is corrected as needed.