公开(公告)号：US20230362035A1

公开(公告)日：2023-11-09

申请号：US18352126

申请日：2023-07-13

Applicant: FURUNO ELECTRIC CO., LTD.

Inventor： Daisuke KIMURA ,  Yusuke TOYODA

IPC: H04L25/02

CPC classification number: H04L25/0222

Abstract: The present disclosure provides a frequency deviation estimation device for estimating a frequency deviation upon receiving a digitally modulated non-repetitive signal. The frequency deviation estimation device is equipped with an instantaneous frequency measurement module, a minimum frequency detection module, and a frequency deviation calculation module. The instantaneous frequency measurement module measures the instantaneous frequency of the received communication signal. The minimum frequency detection module detects the minimum frequency of the instantaneous frequency. The frequency deviation calculation module calculates the frequency deviation between the received communication signal and the reference signal for coarse adjustment using the reference minimum frequency and the minimum frequency when the frequency deviation is zero Hertz.

公开(公告)号：US20240283550A1

公开(公告)日：2024-08-22

申请号：US18654100

申请日：2024-05-03

Applicant: Furuno Electric Co., Ltd.

Inventor： Daisuke KIMURA

IPC: H04B17/23 ,  H04B1/06 ,  H04B17/309

CPC classification number: H04B17/23 ,  H04B1/06 ,  H04B17/346

Abstract: A display processing device capable of preventing generation of interference when performing voice wireless communications between a plurality of ships, or between a ship and a land station, and making normal voice wireless communications start smoothly, is provided. The display processing device includes a receiver and processing circuitry. The receiver receives a radio wave for voice. The processing circuitry performs a determination of a channel used for propagation of the radio wave for voice and a ship/land determination for determining whether an output source of the radio wave for voice is either one of a ship and a land station. The processing circuitry displays, on a screen indicative of a time-series change in the status of use for every channel that may be used, a result of the ship/land determination for the used channel.

公开(公告)号：US20230344464A1

公开(公告)日：2023-10-26

申请号：US18343564

申请日：2023-06-28

Applicant: FURUNO ELECTRIC CO., LTD.

Inventor： Daisuke KIMURA ,  Yusuke TOYODA

IPC: H04B1/7073 ,  H04L7/04

CPC classification number: H04B1/7073 ,  H04L7/04

Abstract: A timing detection device includes a main reference code generation module, an auxiliary reference code generation module, a first correlation processing module, a second correlation processing module, and a subtraction module. The main reference code generation module generates a main reference code consisting of the same code for synchronization included in a received signal. Using a portion of the same code as the code for synchronization, the auxiliary reference code generation module generates an auxiliary reference code consisting of a code configuration different from the main reference code and without generating a main lobe during correlation processing. The first correlation processing module correlates the received signal with the main reference code and outputs a first correlation result. The second correlation processing module correlates the received signal with the auxiliary reference code and outputs a second correlation result. The subtraction module subtracts the first correlation result from the second correlation result.

公开(公告)号：US20250023595A1

公开(公告)日：2025-01-16

申请号：US18901386

申请日：2024-09-30

Applicant: FURUNO ELECTRIC CO., LTD.

Inventor： Daisuke KIMURA

IPC: H04B1/16

Abstract: A ship information exchange device capable of reducing a demodulation processing load is provided. The ship information exchange device includes a receiver, a generator, a detector, and a demodulator. The receiver receives a radio signal. The generator generates reception data of a plurality of channels used for transmission of ship information based on the radio signal. The detector detects a reception level of each of the channels. The demodulator demodulates the reception data. The demodulator determines the reception data to be demodulated according to the detection result of the reception levels.

公开(公告)号：US20230336124A1

公开(公告)日：2023-10-19

申请号：US18339134

申请日：2023-06-21

Applicant: FURUNO ELECTRIC CO., LTD.

Inventor： Daisuke KIMURA

IPC: H03D3/00

CPC classification number: H03D3/007

Abstract: A demodulation device includes a phase rotation module, a phase adjustment module, a phase comparison module, and a reference signal generation module. The phase rotation module rotates phases of an I-Phase signal and a Q-Phase signal in a received signal of a multilevel PSK signal using a reference signal. The phase adjustment module adjusts the phases of the phase rotated I-Phase signal and the phase rotated Q-Phase signal output from the phase rotation module by multiplying the phases of the I-Phase signal and the Q-Phase signal with an integer value to generate a phase adjusted I-Phase signal and a phase adjusted Q-Phase signal. The phase comparison module compares the phase of the phase adjusted I-Phase signal with the phase of the phase adjusted Q-Phase signal to generate a phase comparison result. Also, the reference signal generation module generates a reference signal using the phase comparison result.