US 2009/0021422 A1 · Device and method for estimating the number of arrival signals

Abstract

A largest eigenvalue is determined among eigenvalues corresponding to a correlation matrix indicating correlations between a plurality of channels receiving incoming radar waves from an object that reflects a radar wave as a reference eigenvalue λ1. A ratio Rλi (=10 log 10(λi/λ1)) is calculated of each eigenvalue λ2 to λN to the reference eigenvalue λ1. Eigenvalues among the reference eigenvalue λ1 and the eigenvalues λ2 to λN of which the eigenvalue ratio Rλi is greater than a noise threshold TH are identified as eigenvalues in signal space. Eigenvalues of which the eigenvalue ratio Rλi is equal to the noise threshold TH or less are identified as eigenvalues in noise space. The number of eigenvalues identified as the eigenvalues in signal space is counted as the number of arrival signals.

Claims9

Dependent claims

A method for estimating the number of arrival signals, wherein the method generates a correlation matrix indicating a correlation between a plurality of channels receiving the incident radar waves from an object that reflects a radar wave and estimates the number of arrival signals based on the correlation matrix, the method comprising:

calculating eigenvalues corresponding to the correlation matrix;
selecting a reference eigenvalue from among the calculated eigenvalues;
identifying, among the calculated eigenvalues, eigenvalues of which ratios to the reference eigenvalue are greater than a predetermined threshold;
and
setting the number of identified eigenvalues as the number of arrival signals.

2 more elements

A radar device comprising:

transmitting and receiving means having a plurality of channels that transmit a radar wave and receive incident radar waves from an object reflecting the radar wave;
matrix generating means for generating a correlation matrix indicating correlations between channels based on reception signals obtained from each channel;
eigenvalue calculating means for calculating eigenvalues corresponding to the correlation matrix generated by the matrix generating means;
incident wave estimating means for identifying eigenvalues as a first and a second group of eigenvalues within the eigenvalues calculated by the eigenvalue calculating means and sets the number of identified eigenvalues as the first group of the eigenvalues to be the number of arrival signals;
and
direction estimating means that estimates a direction of arrival of each incident radar wave based on the second group of eigenvalues and the number of arrival signals,
wherein the incident wave estimating means selects a reference eigenvalue from among the eigenvalues, and identifies eigenvalues among the eigenvalues of which ratio to the reference eigenvalue is greater than a threshold as the first group of eigenvalues and eigenvalues of which ratio is equal to the threshold or less as the second group of eigenvalues.

4 more elements

Dependencies are inferred from the claim text.

Device and method for estimating the number of arrival signals

Life of this patent

Device and method for estimating the number of arrival signals

Life of this patent

Abstract

Claims9