ELECTRONIC SCANNING RADAR APPARATUS, RECEIVED WAVE DIRECTION ESTIMATING METHOD, AND RECEIVED WAVE DIRECTION ESTIMATING PROGRAM
First Claim
1. An electronic scanning radar apparatus mounted on a moving object, comprising:
- a receiving unit configured to include a plurality of antennas receiving a received wave arriving from a target having reflected a transmitted wave;
a beat signal generating unit configured to generate beat signals from the transmitted wave and the received wave;
a frequency resolving unit configured to resolve the beat signals into beat frequencies having a predetermined frequency bandwidth and calculate complex data based on the resolved beat signals for each beat frequency; and
an azimuth detecting unit configured to estimate a wave number of the received wave based on an eigenvalue being a component part of a normal equation having complex data as elements calculated based on the beat signals, create a coefficient calculated as a solution of a normal equation of a signal subspace formed based on eigenvalues and eigenvectors corresponding to a number of the estimated wave number, and calculate a DOA of the received wave based on the created coefficient.
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Abstract
An electronic scanning radar apparatus in accordance with an embodiment of the present invention, a frequency resolving unit resolves beat signals into beat frequencies having a predetermined frequency bandwidth and calculates complex data based on the resolved beat signals for each beat frequency. An azimuth calculating unit estimates a number of received waves based on eigenvalues of a matrix being part of a primary normal equation having complex data as elements calculated from the beat signals, creates coefficients calculated as a solution of a secondary normal equation of a signal subspace created based on eigenvalues and eigenvectors corresponding to the number of the estimated waves, and calculates a DOA of a received wave based on the created coefficients.
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Citations
29 Claims
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1. An electronic scanning radar apparatus mounted on a moving object, comprising:
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a receiving unit configured to include a plurality of antennas receiving a received wave arriving from a target having reflected a transmitted wave; a beat signal generating unit configured to generate beat signals from the transmitted wave and the received wave; a frequency resolving unit configured to resolve the beat signals into beat frequencies having a predetermined frequency bandwidth and calculate complex data based on the resolved beat signals for each beat frequency; and an azimuth detecting unit configured to estimate a wave number of the received wave based on an eigenvalue being a component part of a normal equation having complex data as elements calculated based on the beat signals, create a coefficient calculated as a solution of a normal equation of a signal subspace formed based on eigenvalues and eigenvectors corresponding to a number of the estimated wave number, and calculate a DOA of the received wave based on the created coefficient. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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28. A received wave direction estimating method using an electronic scanning radar apparatus mounted on a moving object, comprising:
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a receiving step of receiving a received wave arriving from a target having reflected a transmitted wave by use of a receiving unit including a plurality of antennas; a beat signal generating step of generating beat signals from the transmitted wave and the received wave by use of a beat signal generating unit; a frequency resolving step of resolving the beat signals into beat frequencies having a predetermined frequency bandwidth and calculating complex data based on the resolved beat signals for each beat frequency by use of a frequency resolving unit; and a azimuth estimating step of estimating a wave number of the received wave based on an eigenvalue being a component part of a normal equation having complex data as elements calculated based on the beat signals, creating a coefficient calculated as a solution of a normal equation of a signal subspace formed based on eigenvalues and eigenvectors corresponding to a number of the estimated wave number, and calculating a DOA of the received wave based on the created coefficient by use of an azimuth detecting unit.
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29. A received wave direction estimating program for causing a computer to control operations on a received wave direction estimation by use of an electronic scanning radar apparatus mounted on a moving object, the program causing a computer to execute:
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a receiving process that receives a received wave arriving from a target having reflected a transmitted wave by use of a receiving unit including a plurality of antennas; a beat signal generating process that generates beat signals from the transmitted wave and the received wave by use of a beat signal generating unit; a frequency resolving process that resolves the beat signals into beat frequencies having a predetermined frequency bandwidth and calculates complex data based on the resolved beat signals for each beat frequency by use of a frequency resolving unit; and a azimuth estimating process that estimates a wave number of the received wave based on an eigenvalue being a component part of a normal equation having complex data as elements calculated based on the beat signals, creates a coefficient calculated as a solution of a normal equation of a signal subspace formed based on eigenvalues and eigenvectors corresponding to a number of the estimated wave number, and calculates a DOA of the received wave based on the created coefficient by use of an azimuth detecting unit.
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Specification