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 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 using the threshold for estimating the number of the incoming wave.
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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.
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Citations
16 Claims
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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:
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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 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 using the threshold for estimating the number of the incoming wave. - View Dependent Claims (4, 6)
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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:
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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 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 using the threshold for estimating the number of the incoming wave.
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3. 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:
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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 for each delay time 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 using the threshold for estimating the number of the incoming wave.
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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:
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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 maximum number of the target object for each target detection area covered by the incoming wave, and the incoming wave estimation means rounds the number of the incoming wave to the maximum number when an estimated number of the incoming wave exceeds the maximum number.
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7. 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:
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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;
an incoming wave estimation means for estimating a number of the incoming wave; and
a history data storage means for storing a history data including a distance and a relative speed of the target object at a detection cycle of the target object, wherein the incoming wave estimation means predicts an arrangement of the target object in a next detection cycle, and the incoming wave estimation means estimates the number of the incoming wave based on the predicted arrangement of the target object. - View Dependent Claims (8)
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9. 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:
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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;
an incoming wave estimation means for estimating a number of the incoming wave; and
a history data storage means for storing a history data including a distance and a relative speed of the target object at a detection cycle of the target object, wherein the incoming wave estimation means stores a threshold for the eigenvalue, the incoming wave estimation means distinguishes the eigenvalue in a signal space from the eigenvalue in a non-signal space using the threshold for estimating the number of the incoming wave, the incoming wave estimation means predicts an arrangement of the target object in a next detection cycle, and the incoming wave estimation means changes a value of the threshold based on the predicted arrangement of the target object.
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10. 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:
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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 predetermined number of the incoming wave, the incoming wave estimation means distinguishes the eigenvalue in a signal space from the eigenvalue in a non-signal space by using the predetermined number of the incoming wave for a temporary estimation, the incoming wave estimation means calculates an angle of each incoming wave based on the temporary estimation, the incoming wave estimation means calculates a signal intensity of the incoming wave at the angle of each incoming wave, the incoming wave estimation means stores a threshold for the signal intensity, and the incoming wave estimation means estimates the number of the incoming wave by determining whether the signal intensity exceeds the the threshold. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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Specification