Radar device

摘要

The conventional ESPRIT method is accompanied by the problem of very long signal processing time. The radar device of the invention includes a signal vector-forming unit for forming signal vectors based on waves reflected from an object and received by using a plurality of receiving antennas; a submatrix-forming unit for forming submatrices based on the signal vectors; a regular matrix operation unit for calculating a regular matrix from the submatrices; an eigenvalue decomposition unit for calculating an eigenvalue of the regular matrix; and an angle calculation unit for calculating an angle at where the object is present from the eigenvalue.

主权项

1. A radar device comprising:
a signal vector-forming unit configured to form signal vectors having elements of a number of N based on waves reflected from an object and received by using a plurality of receiving antennas of the number of N; a submatrix-forming unit configured to (i) calculate N×N covariance matrices based on the signal vectors having the elements of the number of N, (ii) extract N×(N−1) submatrices from the N×N covariance matrices, and (iii) form two of (N−1)th-dimensional submatrices R1 and R2 from the N×(N−1) submatrices; a regular matrix operation unit configured to calculate a regular matrix Ψ as Ψ=R1−1*R2 from the two of (N−1)th-dimensional submatrices R1 and R2; an eigenvalue decomposition unit configured to calculate an eigenvalue exp(jΦk) (k=1 to N−1) of the regular matrix Ψ; and an angle calculation unit configured to calculate an angle θk, at where the object is present from phase θk=2*π*(d/λ)*sin(θk) of the eigenvalue exp(jφk), where d is a distance between antennas of a uniform linear array reception antenna, and λ is a wavelength of a center frequency of signals formed by an oscillator.