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US 2022/0091230 A1Published application
Receiver, radar apparatus including receiver, vehicle including receiver, and communication system including receiver
AssigneeMurata Manufacturing Co., Ltd.
InventorsNobuya ARAKAWA, Katsuhisa KASHIWAGI, Ryo SAITO, Koichi ICHIGE
Life of this patent
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Abstract
A receiver accurately performs, using an annihilation filter, angle estimation in two-dimensional directions of an incoming wave. The receiver operates with at least two linear array antenna. The receiver may be implemented in a radar apparatus includes the receiver, as well as a vehicle and a communication system, which also include the receiver.
Claims20
A receiver comprising:
- azimuth angle phase difference first estimation circuitry configured to
- input a plurality of first reception signal groups each including first reception signals received at a plurality of first reception antennas that are part of a first linear array antenna, a number of the first reception signals being larger than a number of incoming waves by one, and
- apply a first annihilation filter (AF) to the first reception signal groups to estimate azimuth angle phase differences of the incoming waves for respective of the first reception antennas, the estimate of azimuth angle phase differences for the first reception antennas being based on phases that occur at zeros of a transfer function of the first AF;
- azimuth angle phase difference second estimation circuitry configured to
- input a plurality of second reception signal groups each including second reception signals received at a plurality of second reception antennas that are part of a second linear array antenna arranged at a height that is different than the first linear array antenna, a number of the second reception signals being larger than the number of the incoming waves by one, and
- apply a second AF to the second reception signal groups to estimate azimuth angle phase differences of the incoming waves for respective of the second reception antennas, the estimate of the azimuth angle phase differences of the incoming waves for the second reception antennas being based on phases that occur at zeros of a transfer function of the second AF;
- incoming wave signal first estimation circuitry that estimates amplitudes and phases of signals of the incoming waves that arrive at a reference first reception antenna that is included in the first linear array antenna, based on azimuth angle phase differences of incoming waves among the first reception antennas estimated by the azimuth angle phase difference first estimation circuitry and the first reception signals;
- incoming wave signal second estimation circuitry that estimates amplitudes and phases of signals of incoming waves arriving at a reference second reception antenna that is included in the second linear array antenna, based on the azimuth angle phase differences of the incoming waves among the second reception antennas estimated by the azimuth angle phase difference second estimation circuitry and the second reception signals;
- elevation angle phase difference estimation circuitry that estimates phase differences that correspond to the height for the incoming waves as elevation angle phase differences, based on the signals estimated by the incoming wave signal first estimation circuitry that arrive at the reference first reception antenna and the signals estimated by the incoming wave signal second estimation circuitry that arrive at the reference second reception antenna;
- and
- incoming direction two-dimensional estimation circuitry that is configured to
- estimate elevation angles of incoming directions of incoming waves based on the elevation angle phase differences estimated by the elevation angle phase difference estimation circuitry, and
- estimate azimuth angles of incoming directions of incoming waves based on the azimuth angle phase differences estimated by the azimuth angle phase difference first estimation circuitry or the azimuth angle phase difference second estimation circuitry.
10 more elements
A reception method comprising:
- receiving a plurality of first reception signal groups each including first reception signals received at a plurality of first reception antennas that are part of a first linear array antenna, a number of the first reception signals being larger than a number of incoming waves by one;
- applying a first annihilation filter (AF) to the first reception signal groups to estimate azimuth angle phase differences of the incoming waves among the first reception antennas, based on phases that occur at zeros of a transfer function of the first AF;
- receive a plurality of second reception signal groups each including second reception signals received at a plurality of second reception antennas that are part of a second linear array antenna arranged at a height that is different than the first linear array antenna, a number of the second reception signals being larger than the number of the incoming waves by one;
- apply a second AF to the second reception signal groups to estimate azimuth angle phase differences of the incoming waves among the second reception antennas, based on phases that occur at zeros of a transfer function of the second AF;
- estimate amplitudes and phases of signals of the incoming waves arriving at a reference first reception antenna included in the first linear array antenna, based on azimuth angle phase differences of incoming waves among the first reception antennas previously estimated and the first reception signals;
- estimating amplitudes and phases of signals of incoming waves arriving at a reference second reception antenna included in the second linear array antenna, based on the azimuth angle phase differences of the incoming waves among the second reception antennas previously estimated and the second reception signals;
- estimating phase differences that correspond to height for the incoming waves as elevation angle phase differences, based on the signals previously estimated to arrive at the reference first reception antenna and the signals estimated to arrive at the reference second reception antenna;
- and
- estimating elevation angles of incoming directions of incoming waves based on the elevation angle phase differences, and
- estimating azimuth angles of incoming directions of incoming waves based on the azimuth angle phase differences previously estimated.
7 more elements
A non-transitory computer storage medium having computer readable instructions stored therein that perform a reception method when executed by a processor, the reception method comprising:
- receiving a plurality of first reception signal groups each including first reception signals received at a plurality of first reception antennas that are part of a first linear array antenna, a number of the first reception signals being larger than a number of incoming waves by one;
- applying a first annihilation filter (AF) to the first reception signal groups to estimate azimuth angle phase differences of the incoming waves among the first reception antennas, based on phases that occur at zeros of a transfer function of the first AF;
- receive a plurality of second reception signal groups each including second reception signals received at a plurality of second reception antennas that are part of a second linear array antenna arranged at a height that is different than the first linear array antenna, a number of the second reception signals being larger than the number of the incoming waves by one;
- apply a second AF to the second reception signal groups to estimate azimuth angle phase differences of the incoming waves among the second reception antennas, based on phases that occur at zeros of a transfer function of the second AF;
- estimate amplitudes and phases of signals of the incoming waves arriving at a reference first reception antenna included in the first linear array antenna, based on azimuth angle phase differences of incoming waves among the first reception antennas previously estimated and the first reception signals;
- estimating amplitudes and phases of signals of incoming waves arriving at a reference second reception antenna included in the second linear array antenna, based on the azimuth angle phase differences of the incoming waves among the second reception antennas previously estimated and the second reception signals;
- estimating phase differences that correspond to height for the incoming waves as elevation angle phase differences, based on the signals previously estimated to arrive at the reference first reception antenna and the signals estimated to arrive at the reference second reception antenna;
- and
- estimating elevation angles of incoming directions of incoming waves based on the elevation angle phase differences, and
- estimating azimuth angles of incoming directions of incoming waves based on the azimuth angle phase differences previously estimated.
7 more elements
Dependencies are inferred from the claim text.