Patent ID: 7847733

Claim:
A direction-of-arrival estimation device comprising: a plurality of sensors receiving arriving signals by reflection of transmission signals from a target to be measured and including at least a first sensor and a second sensor; a receiving unit configured to generate baseband signals from the arriving signals received by said plurality of sensors; a matrix forming unit configured to form a pseudo spatial average covariance matrix R without auto correlation elements by combining first correlation vectors between the baseband signal generated from the arriving signal received by the first sensor and respective baseband signals generated from the arriving signals received by said plurality of sensors except the first sensor, and second correlation vectors between the baseband signal generated from the arriving signal received by the second sensor and respective baseband signals generated from the arriving signals received by said plurality of sensors except the second sensor; and an estimation unit configured to estimate a direction of arrival of the arriving signal from an angle distribution or an algebraic equation by use of (RR H ) −1 , where “ H ” represents complex conjugate transposition, and “ −1 ” represents an inverse matrix, based on the pseudo spatial average covariance matrix R.