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:
Jul. 06, 2004
Filed:
Jun. 03, 2003
Hayato Akazawa, Yokohama, JP;
Eiji Kobayashi, Sagamihara, JP;
Tsugihiro Kurihara, Fujisawa, JP;
Kazuaki Kimura, Yokohama, JP;
Kazutaka Iwase, Yokohama, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
A detection apparatus is provided to detect the direction of arrival and the position of an emission source of radio wave with high accuracy. The apparatus comprises; a first and a second directional antenna and which rotates with a desired angle of elevation; a first and a second phase integral means and for outputting an integration of the output from an antenna; a first and second phase differential means and for outputting an difference of the outputs from an antenna; a first and a second frequency dividing means and for dividing frequency of the integral component of the output from an antenna; a first and a second differential gain control means and for controlling a gain of the differential component of the output from an antenna; a first and a third receiving means and for receiving an output of the frequency dividing means; a second and a fourth receiving means and for receiving an output of the differential gain control means; a first and a second subtraction means and for subtracting one detection signal output from the other detection signal output of each of receiving means and and receiving means and ; a first and a second calculation means and for determining a direction of arrival of radio wave based on an output from the subtraction means; and a position determining calculation means for determining the position of the emission source of the radio wave based on an output from the calculation means.