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:
Mar. 16, 2010
Filed:
May. 13, 2008
Jingmin Xin, Kawasaki, JP;
Jingmin Xin, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
In an environment of spatially correlated additive noise, the direction estimation apparatus for coherent signals calculates (M−q−1) instantaneous cross-correlations between some array data, and selecting multiple pairs each of which is consisted of p instantaneous correlations from the (M−q−1) instantaneous cross-correlations to form a Hankel correlation matrix, where a length of a spatial correlation in terms of antenna elements is assumed to be q. Next, the apparatus divides that Hankel matrix into an upper submatrix and a lower submatrix, and then calculates a linear operator at time n by using the adaptive LMS algorithm with a fixed or time-varying step-size parameter. Then a noise subspace is estimated from that linear operator. Finally the directions of incident signals at a predetermined time is estimated and tracked by using that noise subspace with Newton approximation.