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公开(公告)号：US20210247486A1
公开(公告)日：2021-08-12
申请号：US17245317
申请日：2021-04-30
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Katsuhisa KASHIWAGI , Nobuya ARAKAWA , Hideaki YAMADA
Abstract: An antenna apparatus includes multiple antenna elements each performing at least one of transmission and reception of radio waves. The coverage areas of main lobes of radiation patterns of the multiple antenna elements are overlapped with each other and the shapes of side lobes thereof are varied among the multiple antenna elements. With this configuration, it is possible to discriminate and acquire the signal of the radio waves coming from the coverage areas of the main lobes of the antenna from the signal of the radio waves coming from the outside of the coverage areas.
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公开(公告)号：US20210181329A1
公开(公告)日：2021-06-17
申请号：US17168834
申请日：2021-02-05
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Katsuhisa KASHIWAGI
IPC: G01S13/58 , G01S13/931 , G01S7/35
Abstract: A radar device includes: a single-system transmission system that transmits a frequency-modulated transmission signal; a single-system reception system that receives, as a reception signal, a reflected wave generated by the transmission signal being reflected by an object and that generates a beat signal; and a signal processing unit that detects a position of the object on the basis of the beat signal. The transmission system includes a transmission antenna that is attached to a moving body and radiates the transmission signal in a direction perpendicular to a movement direction of the moving body. The signal processing unit detects an azimuth angle of the object on the basis of a relative velocity of the object and a movement velocity of the moving body.
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公开(公告)号：US20250035767A1
公开(公告)日：2025-01-30
申请号：US18909957
申请日：2024-10-09
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Katsuhisa KASHIWAGI
Abstract: A positioning system includes a transceiver and a signal processing unit. The signal processing unit acquires a plurality of antenna data from the transceiver, the antenna data being obtained by radio waves being transmitted and received between transmitting antennas and receiving antennas. In angle estimation processing of the target by employing an Annihilating Filter method, the signal processing unit generates a convolution matrix by stacking the plurality of antenna data in a row direction of a matrix and combining the antenna data, and determines a filter coefficient vector from simultaneous equations expressed by using a matrix product of the convolution matrix and the filter coefficient vector. The signal processing unit calculates a phase difference between antennas from the determined filter coefficient vector and performs an operation to estimate an arrival angle of the reflected wave from the target.
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公开(公告)号：US20240151812A1
公开(公告)日：2024-05-09
申请号：US18402772
申请日：2024-01-03
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Katsuhisa KASHIWAGI , Tsubasa KOUNO
IPC: G01S7/35 , G01S13/536 , G01S13/75 , G01S13/931
CPC classification number: G01S7/354 , G01S13/536 , G01S13/75 , G01S13/931
Abstract: Transmission signal generation circuitry generates a transmission chirp, and the transmission chirp is transmitted from a transmission antenna. A reflected wave, from an object to be detected, of the transmission chirp transmitted from the transmission antenna is received by a reception antenna. A mixer mixes the transmission chirp and a reception chirp received by the reception antenna to generate an intermediate frequency signal. Signal processing circuitry obtains, for a plurality of respective analysis periods corresponding to different frequency bands of the transmission chirp, frequency spectral waveforms of the intermediate frequency signal, detects a peak appearing in the plurality of frequency spectral waveforms, and determines, based on variations in peak position among the plurality of frequency spectral waveforms, whether or not the peak is due to a valid object.
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公开(公告)号：US20210270954A1
公开(公告)日：2021-09-02
申请号：US17325716
申请日：2021-05-20
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Katsuhisa KASHIWAGI , Nobuyuki NOZAWA
IPC: G01S13/536 , G01S13/86 , G01S13/931
Abstract: A radar device includes a radar unit, a signal processing unit, a GPS receiver, and a storage unit. The signal processing unit acquires, for each target, a distance (R) to the target and a relative velocity (Veff) between the radar unit and the target when the radar unit is moving. The signal processing unit separately detects positions of a plurality of targets by using a separation algorithm in which a difference between the relative velocities (Veff) is used. When the radar unit is stopped, the signal processing unit corrects the position of each target detected when the radar unit has been moving, based on a current position of the radar unit stored in the storage unit, and identifies the positions of the plurality of targets.
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Patent Agency Ranking
公开(公告)号：US20230030969A1
公开(公告)日：2023-02-02
申请号：US17963220
申请日：2022-10-11
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Ryo SAITO , Katsuhisa KASHIWAGI , Nobuya ARAKAWA , Koichi ICHIGE
IPC: G01S13/931 , G01S13/42
Abstract: A radar device includes an oscillator that generates a transmission signal including a plurality of chirp signals, the chirp signal having a frequency that increases or decreases from an initial frequency in each predetermined sweep cycle. The oscillator changes the initial frequency of each chirp signal. A transmitter emits the transmission signal, and a receiver receives a reflected wave of the transmission signal reflected at an object and an unwanted wave as a reception signal. Circuitry is configured to estimate a phase of the reception signal from the transmission signal and the reception signal, calculate a correlation between a change pattern of the initial frequency of each chirp signal and a change pattern of the phase of the reception signal, estimate the reflected wave from the reception signal based on the correlation, and calculate a number of incoming waves based on a result of the estimation of the reflected wave.
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公开(公告)号：US20220091230A1
公开(公告)日：2022-03-24
申请号：US17543755
申请日：2021-12-07
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Nobuya ARAKAWA , Katsuhisa KASHIWAGI , Ryo SAITO , Koichi ICHIGE
IPC: G01S7/40 , G01S13/931
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.
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公开(公告)号：US20220003833A1
公开(公告)日：2022-01-06
申请号：US17480811
申请日：2021-09-21
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Nobuya ARAKAWA , Katsuhisa KASHIWAGI
IPC: G01S7/03 , G01S7/02 , G01S7/40 , G01S13/931
Abstract: A detection component of a reflected wave generated due to a transmitted wave being reflected inside a radome is removed from a measurement intermediate frequency signal IFγ obtained by a mixer circuit when measuring the position of an object, the detection component of the reflected wave being removed by a radome reflection correcting unit subtracting a difference Diff. stored in advance in a correction data storage unit. In addition, when the radome reflection correcting unit performs the subtraction, the phase of the result of the subtraction is corrected by a phase shift amount ejΔθ calculated by the phase shift amount calculating unit so that a phase shift of a measurement intermediate frequency signal IFγ caused by the device temperature is corrected. A distance/angle computing unit computes the position of the object from the thus-corrected measurement intermediate frequency signal IFγ.
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公开(公告)号：US20210149038A1
公开(公告)日：2021-05-20
申请号：US17161891
申请日：2021-01-29
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Atsuyuki YUASA , Katsuhisa KASHIWAGI
Abstract: A radar device includes plural transmit antennas, plural receive antennas, a local oscillator that oscillates a local signal, a transmit processor that sends transmit signals based on the local signal from the transmit antennas, a receive processor that outputs beat signals from the local signal and echo signals generated as a result of the transmit signals being reflected by a target and received by the receive antennas, and a signal processor that executes signal processing on the beat signals. The transmit processor sends the transmit signals from the plural transmit antennas at different timings and also simultaneously sends the transmit signals which are combinable with each other from the plural transmit antennas.
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公开(公告)号：US20240183890A1
公开(公告)日：2024-06-06
申请号：US18437662
申请日：2024-02-09
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Nobuya ARAKAWA , Katsuhisa KASHIWAGI , Ryo SAITO
Abstract: A spectrum analysis program causing a computer system to execute: generating, using an AF method, first frequency spectrum data having continuous frequency values from a wireless signal, generating, using a frequency spectrum analysis method for outputting reference power values for the wireless signal, second frequency spectrum data having discrete frequency values from the wireless signal, pairing, with each other, frequency values that are closest among frequency values of the first frequency spectrum data and frequency values of the second frequency spectrum data, and generating, based on a comparison between a first power value at a first frequency in the first frequency spectrum data and a second power value at a second frequency corresponding to the first frequency in the second frequency spectrum data, frequency spectrum data serving as an analysis result.
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