Radar device
First Claim
1. A radar device using a transmission signal outputted from a transmission antenna and a reception signal as an incoming wave reflected from a target object through an arrangement of reception antennas for estimating an angle of the incoming wave comprising:
- a beat signal generation means for generating a beat signal from a difference of the transmission signal and the reception signal in a frequency element;
a self-correlation matrix calculation means for calculating a self-correlation matrix based on the beat signal;
an eigenvalue calculation means for calculating an eigenvalue using the self-correlation matrix; and
an incoming wave estimation means for estimating a number of the incoming wave,wherein the incoming wave estimation means stores a threshold eigenvalue for each beat frequency of the beat signal, andthe incoming wave estimation means distinguishes the incoming wave in a signal space from the incoming wave in a non-signal space by dividing the eigenvalue into two parts representing the signal space and the non-signal space using the threshold eigenvalue for estimating the number of the incoming wave.
1 Assignment
0 Petitions
Accused Products
Abstract
A radar device uses a transmission signal outputted from a transmission antenna and a reception signal as an incoming wave reflected from a target object through an arrangement of reception antennas for estimating an angle of the incoming wave. An incoming wave estimation process stores a threshold for each beat frequency of the beat signal, and distinguishes the incoming wave in a signal space from the incoming wave in a non-signal space using the threshold. The estimation process facilitates an accurate estimation of the incoming wave in MUSIC method, ESPRIT method or the like.
-
Citations
6 Claims
-
1. A radar device using a transmission signal outputted from a transmission antenna and a reception signal as an incoming wave reflected from a target object through an arrangement of reception antennas for estimating an angle of the incoming wave comprising:
-
a beat signal generation means for generating a beat signal from a difference of the transmission signal and the reception signal in a frequency element; a self-correlation matrix calculation means for calculating a self-correlation matrix based on the beat signal; an eigenvalue calculation means for calculating an eigenvalue using the self-correlation matrix; and an incoming wave estimation means for estimating a number of the incoming wave, wherein the incoming wave estimation means stores a threshold eigenvalue for each beat frequency of the beat signal, and the incoming wave estimation means distinguishes the incoming wave in a signal space from the incoming wave in a non-signal space by dividing the eigenvalue into two parts representing the signal space and the non-signal space using the threshold eigenvalue for estimating the number of the incoming wave. - View Dependent Claims (3, 4)
-
-
2. A radar device using a transmission signal outputted from a transmission antenna and a reception signal as an incoming wave reflected from a target object through an arrangement of reception antennas for estimating an angle of the incoming wave comprising:
-
a beat signal generation means for generating a beat signal from a difference of the transmission signal and the reception signal in a frequency element; a self-correlation matrix calculation means for calculating a self-correlation matrix based on the beat signal; an eigenvalue calculation means for calculating an eigenvalue using the self-correlation matrix; and an incoming wave estimation means for estimating a number of the incoming wave, wherein the incoming wave estimation means stores a threshold eigenvalue for each phase of the beat signal, and the incoming wave estimation means distinguishes the incoming wave in a signal space from the incoming wave in a non-signal space by dividing the eigenvalue into two parts representing the signal space and the non-signal space using the threshold eigenvalue for estimating the number of the incoming wave.
-
-
5. A radar device using a transmission signal outputted from a transmission antenna and a reception signal as an incoming wave reflected from a target object through an arrangement of reception antennas for estimating an angle of the incoming wave comprising:
-
a beat signal generation means for generating a beat signal from a difference of the transmission signal and the reception signal in a frequency element; a self-correlation matrix calculation means for calculating a self-correlation matrix based on the beat signal; an eigenvalue calculation means for calculating an eigenvalue using the self-correlation matrix; and an incoming wave estimation means for estimating a number of the incoming wave, wherein the incoming wave estimation means stores a threshold eigenvalue based on the beat signal, and the incoming wave estimation means distinguishes the incoming wave in a signal space from the incoming wave in a non-signal space by dividing the eigenvalue into two parts representing the signal space and the non-signal space using the threshold eigenvalue based on the beat signal.
-
-
6. A radar device using a transmission signal outputted from a transmission antenna and a reception signal as an incoming wave reflected from a target object through an arrangement of reception antennas for estimating an angle of the incoming wave comprising:
-
a beat signal generation means for generating a beat signal from a difference of the transmission signal and the reception signal in a frequency element; a self-correlation matrix calculation means for calculating a self-correlation matrix based on the beat signal; an eigenvalue calculation means for calculating an eigenvalue using the self-correlation matrix; and an incoming wave estimation means for estimating a number of the incoming wave based on the eigenvalue prior to estimating the angle of the incoming wave, wherein the incoming wave estimation means stores a threshold eigenvalue for each phase of the beat signal, and the incoming wave estimation means distinguishes the incoming wave in a signal space from the incoming wave in a non-signal space by dividing the eigenvalue into two parts representing the signal space and the non-signal space using the threshold eigenvalue for estimating the number of the incoming wave.
-
Specification