公开(公告)号：US20230033166A1

公开(公告)日：2023-02-02

申请号：US17966914

申请日：2022-10-17

Applicant: Murata Manufacturing Co., Ltd.

Inventor： Nobuya ARAKAWA ,  Katsuhisa KASHIWAGI ,  Ryo SAITO ,  Koichi ICHIGE

IPC: G01S7/35 ,  G01S13/42

Abstract: A communication apparatus capable of estimating the number of incoming waves with high accuracy is provided. A communication apparatus includes an antenna, a matrix calculator that calculates, based on reception signals received from the antenna, a first matrix having singular values of a reception signal matrix, a matrix calculator that extracts reception signals whose frequency is within a specific frequency range from the reception signals and calculates, based on the extracted reception signals, a second matrix having singular values of a second reception signal matrix, and a number-of-incoming-waves estimator that estimates, based on the first matrix and the second matrix, the number of incoming waves of the reception signals.

公开(公告)号：US20230032458A1

公开(公告)日：2023-02-02

申请号：US17966898

申请日：2022-10-17

Applicant: Murata Manufacturing Co., Ltd.

Inventor： Nobuya ARAKAWA ,  Katsuhisa KASHIWAGI ,  Ryo SAITO ,  Koichi ICHIGE

IPC: G01S7/35 ,  G01S13/42

Abstract: A communication device is capable of estimating an incoming wave number with high accuracy. A communication device includes an antenna and circuitry configured to calculate an arrival direction of a reception signal received from the antenna in a case of a predetermined incoming wave number based on the reception signal and the predetermined incoming wave number, calculate an incoming signal for each of one or more arrival directions in a case of a certain incoming wave number based on the incoming wave number and the one or more arrival directions, and estimate an incoming wave number of the reception signal based on levels of the incoming signals in a plurality of arrival directions.

公开(公告)号：US20230032399A1

公开(公告)日：2023-02-02

申请号：US17954351

申请日：2022-09-28

Applicant: Murata Manufacturing Co., Ltd.

Inventor： Katsuhisa KASHIWAGI

IPC: G01S13/42 ,  G01S13/931

Abstract: A radar device includes a transmitter that generates, as a transmission wave, an electromagnetic-wave beam including a first chirp signal and a second chirp signal, the first chirp signal being a chirp signal whose frequency changes from a first frequency with time, and the second chirp signal being a chirp signal whose frequency changes, with time, from a second frequency different from the first frequency An antenna transmits the transmission wave and receives a reflected wave obtained by reflecting the transmission wave from a target. Circuitry is configured to estimate a first distance, which is a distance to the target, based on a signal related to the reflected wave, estimate a phase difference for the first distance, and estimate a second distance, which is a distance to the target, based on the phase difference and a difference between the first frequency and the second frequency.

公开(公告)号：US20200217924A1

公开(公告)日：2020-07-09

申请号：US16808640

申请日：2020-03-04

Applicant: Murata Manufacturing Co., Ltd.

Inventor： Katsuhisa KASHIWAGI ,  Atsuyuki YUASA

IPC: G01S7/35 ,  G01S13/931 ,  G01S13/58

Abstract: A radar apparatus and an automobile including the radar apparatus are provided. The radar apparatus may measure the elevation/declination angle of a target with high accuracy by using simple circuits at low cost without use of a detection circuit and an AD conversion circuit having high time resolution. A transmit antenna transmits transmit signal waves modulated through the multilevel FSK, and receive antennas receive reflected waves obtained by reflecting, off a target, the transmit signal waves which return. The multilevel FSK is used as a modulation method so that the beat frequency between the receive signal waves from the target and the transmit signal waves serves as the Doppler frequency. Thus, the elevation/declination angle φ of the target is calculated by a computing unit, not from the frequencies of the receive signal waves as in the related art, but from the frequency of the transmit signal waves.