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公开(公告)号：US10413229B2
公开(公告)日：2019-09-17
申请号：US15667437
申请日：2017-08-02
Inventor： Takeshi Nakayama , Shoichi Iizuka , Naoki Honma
Abstract: A device that differentiates a living body includes at least one transmission antenna element that transmits a transmission signal to a predetermined range including the living body, N receivers that are arranged to surround a periphery of the predetermined range and each receive N reception signals using respective reception antenna elements of the receivers during a predetermined period, the N reception signals including a reflection signal resulting from the transmission signal reflected off the living body, memory that stores a teacher signal, a circuit that calculates a plurality of correlation coefficients according to the teacher signal and the N reception signals received by the N receivers and determines that the living body and the subject living body are identical to each other when a predetermined correlation coefficient included in the plurality of correlation coefficients is included in a predetermined value range.
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Patent Agency Ranking
公开(公告)号：US12117550B2
公开(公告)日：2024-10-15
申请号：US17612820
申请日：2020-12-28
Inventor： Shoichi Iizuka , Takeshi Nakayama , Naoki Honma , Nobuyuki Shiraki
IPC: G01S5/02
CPC classification number: G01S5/0278
Abstract: A sensor includes: a living body component extractor that receives a signal transmitted from each transmitting station and influenced by a living body, and extracts a signal component influenced by the living body; a position spectrum function calculator that calculates as many position spectrum functions as the number of combinations of transmitting stations and receiving stations, the position spectrum functions each being calculated from the signal component and corresponding to a likelihood of a position of the living body; a weight function calculator that calculates as many weight functions as the number of combinations, the weight functions each representing reliability of a position spectrum function; an integrated position spectrum function calculator that outputs an integrated position spectrum function using the position spectrum functions and the weight functions; and a position estimator that estimates the position of the living body by detecting a maximum value from the integrated position spectrum function.
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公开(公告)号：US11906656B2
公开(公告)日：2024-02-20
申请号：US17414690
申请日：2020-02-25
Inventor： Shoichi Iizuka , Takeshi Nakayama , Naoki Honma , Kazuki Numazaki , Nobuyuki Shiraki
Abstract: A sensor includes: a correlation matrix calculator which calculates a correlation matrix from biological information extracted using reception signals obtained by receiving, in a predetermined period, signals transmitted to a predetermined space; a first number information calculator which calculates first number information; a MUSIC spectrum calculator which estimates a candidate of a position of at least one living body and outputs a likelihood spectrum; and a second number information calculator which estimates a position or second number information, which is a total number of living bodies with an increased degree of likelihood, from first position information possibly including a plurality of position candidates.
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公开(公告)号：US11561279B2
公开(公告)日：2023-01-24
申请号：US16707323
申请日：2019-12-09
Inventor： Takeshi Nakayama , Shoichi Iizuka , Naoki Honma , Nobuyuki Shiraki , Abudusaimi Abuduaini
Abstract: An estimating method includes: measuring and receiving reception signals including a reflected signal reflected by a moving body, for a first period equivalent to a cycle of movement of the moving body; calculating first complex transfer functions indicating propagation characteristics, from the reception signals measured in the first period; calculating second complex transfer functions having reduced components corresponding to fluctuations, from the first complex transfer functions; extracting moving body information corresponding to a component related to the moving body by extracting moving body information corresponding to a predetermined frequency range of the second complex transfer functions calculated; and estimating a direction in which the moving body is present using the moving body information.
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公开(公告)号：US10912493B2
公开(公告)日：2021-02-09
申请号：US15851858
申请日：2017-12-22
Inventor： Takeshi Nakayama , Shoichi Iizuka , Naoki Honma , Dai Sasakawa
IPC: A61B5/11 , G01S13/42 , G01S7/41 , A61B5/05 , G01S13/88 , G01S13/89 , G01S13/00 , G01B15/00 , A61B5/024 , A61B5/08 , A61B5/0507
Abstract: A sensor includes: a transmitting antenna with N transmitting antenna elements transmitting transmission signals; a receiving antenna with M receiving antenna elements, each receiving N received signals including a reflection signal generated by the living body reflecting part of the N transmission signals; a circuit; and a memory. The circuit extracts a second matrix corresponding to a specified frequency range from an N×M first matrix calculated from each received signal and indicating a propagation property between each transmitting antenna element and each receiving antenna element, estimates the position where the living body is present using the second matrix, calculates a radar cross-section (RCS) value of the living body based on the estimated position and the positions of the transmission and receiving antennas, and estimates the motion of the living body using the calculated RCS value and information indicating correspondence between RCS values and motions of the living body.
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公开(公告)号：US10241187B2
公开(公告)日：2019-03-26
申请号：US15383243
申请日：2016-12-19
Inventor： Naoki Honma , Takeshi Nakayama , Takashi Morimoto
Abstract: A sensor includes a reception antenna, a parasitic antenna terminating in a variable load, a controller, a transmitter transmitting a transmission signal, a receiver, a memory, and a processor. The controller sets an impedance value of the variable load. The receiver receives a first signal formed of signals received by the antennas and derived from the transmission signal, and the signal received by the parasitic antenna corresponding to the impedance value. The memory stores a first signal strength value of the first signal corresponding to the impedance value. The processor sets candidates of a complex propagation channel, calculates second signal strength values of a second signal respectively corresponding to the candidates, estimates a target complex propagation channel by selecting a candidate corresponding to a minimum difference among differences between the first signal strength value and the second signal strength values, and estimates a direction of arrival of the first signal.
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