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:
May. 12, 2009
Filed:
Nov. 22, 2006
Kanako Honda, Kobe, JP;
Kanako Honda, Kobe, JP;
Fujitsu Ten Limited, Kobe-shi, JP;
Abstract
In a radar apparatus having a plurality of antennas having switches respectively, malfunctions of the switches are detected by comparing the reception signal levels of the respective antennas with one another. Specifically, if the difference among the reception signal levels is at least a predetermined value, it is determined that at least one switch malfunctions so as not to be turned ON. Moreover, if the difference among the signal levels is smaller than the gain difference of each antenna and is substantially the same, it is determined that there is a malfunction in which all of the compared switches are not turned OFF. In addition, in an OFF state of each switch, if a reception signal of a predetermined level or more is detected, it is determined that there is a malfunction in which at least one switch is not turned OFF.