Communications: directive radio wave systems and devices (e.g. – Directive – Beacon or receiver
Reexamination Certificate
2008-05-27
2008-05-27
Phan, Dao (Department: 3662)
Communications: directive radio wave systems and devices (e.g.,
Directive
Beacon or receiver
C342S420000
Reexamination Certificate
active
07379020
ABSTRACT:
A radio wave direction-of-arrival estimation apparatus and method that can estimate, at high speed and with good accuracy, the direction of arrival of a plurality of incoming waves having high correlation. The radio wave direction-of-arrival estimation apparatus includes: an array antenna constructed from a plurality of antenna elements; a receiver for receiving an incoming wave via each of the antenna elements; a correlation matrix calculator for calculating a correlation matrix from each received signal; a correction matrix adder for adding a correction matrix having a suitable correction value only at a specific matrix element to the calculated correlation matrix; an inverse matrix calculator for calculating the inverse matrix of the correlation matrix to which the correction matrix has been added; a weight vector calculator for calculating a weight vector based on the calculated inverse matrix; an angular spectrum calculator for calculating an angular spectrum by using the calculated weight vector; and a direction-of-arrival estimator for estimating the direction of arrival of the incoming wave from the peak waveform of the calculated angular spectrum.
REFERENCES:
patent: 5631898 (1997-05-01), Dent
patent: 6075484 (2000-06-01), Daniel et al.
patent: 6836245 (2004-12-01), Kishigami et al.
patent: 7088956 (2006-08-01), Kishigami et al.
patent: 7117016 (2006-10-01), Kisigami et al.
patent: 2002-148324 (2002-05-01), None
patent: 2004-198218 (2004-07-01), None
Patent Abstract of Japan, Publication No. 2002148324 A, published May 22, 2002, in the name of Hirakawa et al.
Patent Abstract of Japan, Publication No. 2004198218 A, published Jul. 15, 2004, in the name of Shirodono et al.
Nobuyoshi Kikuma,Adapative Signal Processing by Array Antenna, Kagaku Gijutsu Shuppan, Nov. 25, 1998, pp. 173-268.
Seike Yasushi
Shirakawa Kazuo
Tsuchihashi Masataka
Xin Jingmin
Christie Parker & Hale LLP
Fujitsu Limited
Phan Dao
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