Apparatus and method for estimating direction of arrival of radio wave
First Claim
1. A radio wave direction-of-arrival estimation apparatus comprising:
- an array antenna constructed from a plurality of antenna elements;
a receiver for receiving an incoming wave via each of said antenna elements of said array antenna;
a correlation matrix calculating unit for calculating a correlation matrix from each signal received by said receiver;
a correction matrix adding unit for adding a correction matrix having a correction value at a specific matrix element to said correlation matrix calculated by said correlation matrix calculating unit;
an inverse matrix calculating unit for calculating an inverse matrix of said correlation matrix to which said correction matrix has been added by said correction matrix adding unit; and
a direction-of-arrival estimating unit for estimating the direction of arrival of said incoming wave based on said inverse matrix calculated by said inverse matrix calculating unit.
1 Assignment
0 Petitions
Accused Products
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.
-
Citations
20 Claims
-
1. A radio wave direction-of-arrival estimation apparatus comprising:
-
an array antenna constructed from a plurality of antenna elements;
a receiver for receiving an incoming wave via each of said antenna elements of said array antenna;
a correlation matrix calculating unit for calculating a correlation matrix from each signal received by said receiver;
a correction matrix adding unit for adding a correction matrix having a correction value at a specific matrix element to said correlation matrix calculated by said correlation matrix calculating unit;
an inverse matrix calculating unit for calculating an inverse matrix of said correlation matrix to which said correction matrix has been added by said correction matrix adding unit; and
a direction-of-arrival estimating unit for estimating the direction of arrival of said incoming wave based on said inverse matrix calculated by said inverse matrix calculating unit. - View Dependent Claims (4, 5, 6, 7, 8, 9)
-
-
2. A radio wave direction-of-arrival estimation apparatus comprising:
-
an array antenna constructed from a plurality of antenna elements;
a receiver for receiving an incoming wave via each of said antenna elements of said array antenna;
a correlation matrix calculating unit for calculating a correlation matrix from each signal received by said receiver;
an inverse matrix calculating unit for calculating an inverse matrix of said correlation matrix calculated by said correlation matrix calculating unit;
a correction value adding unit for adding a correction value to a specific matrix element when said specific matrix element is determined to be smaller than a predetermined value during the calculation of said inverse matrix being performed by said inverse matrix calculating unit; and
a direction-of-arrival estimating unit for estimating the direction of arrival of said incoming wave based on said inverse matrix calculated by said inverse matrix calculating unit.
-
-
3. A radio wave direction-of-arrival estimation apparatus comprising:
-
an array antenna constructed from a plurality of antenna elements;
a receiver for receiving an incoming wave via each of said antenna elements of said array antenna;
a correlation matrix calculating unit for calculating a correlation matrix from each signal received by said receiver;
an inverse matrix calculating unit for calculating an inverse matrix of said correlation matrix calculated by said correlation matrix calculating unit;
a correction matrix adding unit for adding a correction matrix having a correction value at a specific matrix element to said correlation matrix during the calculation of said inverted matrix when any specific matrix element is determined to be smaller than a predetermined value during the calculation of said inverse matrix being performed by said inverse matrix calculating unit; and
a direction-of-arrival estimating unit for estimating the direction of arrival of said incoming wave based on said inverse matrix calculated by said inverse matrix calculating unit.
-
-
10. A radio wave direction-of-arrival estimation method comprising:
-
calculating a correlation matrix from each signal received by a receiver via each antenna element of an array antenna;
adding a correction matrix having a correction value at a specific matrix element to said calculated correlation matrix;
calculating an inverse matrix of said correlation matrix to which said correction matrix has been added; and
estimating the direction of arrival of an incoming wave based on said calculated inverse matrix. - View Dependent Claims (13, 14, 15, 16, 17, 18)
-
-
11. A radio wave direction-of-arrival estimation method comprising:
-
calculating a correlation matrix from each signal received by a receiver via each antenna element of an array antenna;
calculating an inverse matrix of said calculated correlation matrix;
adding a correction value to a specific matrix element when said specific matrix element is determined to be smaller than a predetermined value during the calculation of said inverse matrix; and
estimating the direction of arrival of an incoming wave based on said calculated inverse matrix.
-
-
12. A radio wave direction-of-arrival estimation method comprising:
-
calculating a correlation matrix from each signal received by a receiver via each antenna element of an array antenna;
calculating an inverse matrix of said calculated correlation matrix;
adding a correction matrix having a correction value at a specific matrix element to said correlation matrix during the calculation of said inverse matrix when any specific matrix element is determined to be smaller than a predetermined value during the calculation of said inverse matrix;
adding said correction value to said specific matrix element; and
estimating the direction of arrival of an incoming wave based on said calculated inverse matrix.
-
-
19. A radar apparatus equipped with a radio wave direction-of-arrival estimation apparatus comprising:
-
an array antenna constructed from a plurality of antenna elements;
a receiver for receiving an incoming wave via each of said antenna elements of said array antenna;
a correlation matrix calculating unit for calculating a correlation matrix from each signal received by said receiver;
a correction matrix adding unit for adding a correction matrix having a correction value at a specific matrix element to said correlation matrix calculated by said correlation matrix calculating unit;
an inverse matrix calculating unit for calculating an inverse matrix of said correlation matrix to which said correction matrix has been added by said correction matrix adding unit; and
a direction-of-arrival estimating unit for estimating the direction of arrival of said incoming wave based on said inverse matrix calculated by said inverse matrix calculating unit.
-
-
20. A radar apparatus equipped with a radio wave direction-of-arrival estimation apparatus comprising:
-
an array antenna constructed from a plurality of antenna elements;
a receiver for receiving an incoming wave via each of said antenna elements of said array antenna;
a correlation matrix calculating unit for calculating a correlation matrix from each signal received by said receiver;
an inverse matrix calculating unit for calculating an inverse matrix of said correlation matrix calculated by said correlation matrix calculating unit;
a correction value adding unit for adding a correction value to a specific matrix element when said specific matrix element is determined to be smaller than a predetermined value during the calculation of said inverse matrix being performed by said inverse matrix calculating unit; and
a direction-of-arrival estimating unit for estimating the direction of arrival of said incoming wave based on said inverse matrix calculated by said inverse matrix calculating unit.
-
Specification