| 摘要 |
PROBLEM TO BE SOLVED: To realize reduction of operation quantity while maintaining estimation accuracy.SOLUTION: An arrival direction estimating device relating to one embodiment in the disclosure includes multiple antenna elements, a matrix calculation part, an eigenvalue decomposition part, a wave number estimation part, a feature quantity calculation part and a method switching part. The antenna elements obtain reception signals by receiving incoming waves. The matrix calculation part uses the reception signals to calculate a correlation matrix. The eigenvalue decomposition part performs eigenvalue decomposition of the correlation matrix and obtains eigenvalues. The wave number estimation part estimates the number of incoming waves included in the reception signals, on the basis of the eigenvalues. The feature quantity calculation part calculates a first feature quantity for each of the number of incoming waves, which is obtained for each eigenvector corresponding to each eigenvalue of the incoming waves and shows dispersion of each element of the vectors. The method switching part generates: a first instruction for using a first method to estimate an arrival direction of the incoming waves when the first feature quantity is equal to or less than a first threshold; and a second instruction for using a second method to estimate the arrival direction of the incoming waves when the first feature quantity is greater than the first threshold. |
