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11.发明授权公开(公告)号：US11163057B2
公开(公告)日：2021-11-02
申请号：US16389541
申请日：2019-04-19
Inventor： Shoichi Iizuka , Takeshi Nakayama , Naoki Honma , Nobuyuki Shiraki
Abstract: An estimation device includes: a living body information extraction unit that extracts living body information which is a component corresponding to one or more living bodies in a space; an eigenvector calculation unit that calculates one or more eigenvectors of a living body correlation matrix obtained from the living body information; a first position estimation unit that estimates, using the living body correlation matrix, positions of the one or more living bodies and at least one false image, according to a predetermined position estimation method; a second steering vector output unit that extracts, from first steering vectors stored in a storage, and outputs as second steering vectors, first steering vectors corresponding to the positions estimated; and a second position estimation unit that estimates at least one of the position and the number of the one or more living bodies, using the one or more eigenvectors and the second steering vectors.
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公开(公告)号：US11047968B2
公开(公告)日：2021-06-29
申请号：US16711855
申请日：2019-12-12
Inventor： Shoichi Iizuka , Takeshi Nakayama , Naoki Honma , Dai Sasakawa , Nobuyuki Shiraki , Kazuki Numazaki
IPC: G01S13/06 , G01S13/04 , H04L25/02 , H04B13/00 , H04B17/391 , H04B17/309 , H04B7/0413
Abstract: Complex transfer functions indicating characteristics of propagation between transmission antenna elements and N reception antenna elements are calculated from reception signals received by the N reception antenna elements during a predetermined period. Components affected by vital activity are extracted from the calculated complex transfer functions. A correlation matrix is calculated from changed components affected by vital activity. A steering vector for regions divided from a target region is calculated. A living-body signal intensity vector is estimated by performing compressed sensing for an unknown value that is the living-body signal intensity vector using a correlation matrix vector and an extended steering vector. The number of components constituting the living-body signal intensity vector and having a value of at least a predetermined threshold is estimated to be the number of living bodies, and positions of regions corresponding to the components are estimated to be estimated positions of the living bodies.
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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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公开(公告)号：US10895631B2
公开(公告)日：2021-01-19
申请号：US16598628
申请日：2019-10-10
Inventor： Takeshi Nakayama , Shoichi Iizuka , Naoki Honma , Dai Sasakawa
Abstract: A sensor includes circuitry and a memory, wherein the circuitry acquires an N×M first matrix having complex-number transfer function components representing propagation characteristics between a transmit antenna element and a receive antenna element, from N receive signals received by each of M receive antenna elements for a predetermined period. The circuitry extracts a second matrix, corresponding to a predetermined frequency range from the first matrix, representing components influenced by a vital sign, and estimates a position of the organism with respect to the sensor by using the second matrix. The circuitry also calculates a first distance, indicating a distance between the organism and the transmit antenna, and a second distance, indicating a distance between the organism and the receive antenna. The circuitry further calculates a radar cross-section value with respect to the organism, and estimates a posture of the organism.
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公开(公告)号：US10473756B2
公开(公告)日：2019-11-12
申请号：US15631367
申请日：2017-06-23
Inventor： Takeshi Nakayama , Shoichi Iizuka , Naoki Honma , Dai Sasakawa
Abstract: A sensor includes a transmit antenna, a receive antenna, circuitry, and a memory. The transmit antenna includes N transmit antenna elements each transmitting a transmit signal. The receive antenna includes M receive antenna elements each receiving N receive signals including reflection signals reflected by an organism. The circuitry extracts a second matrix corresponding to a predetermined frequency range from an N×M first matrix representing propagation characteristics between each transmit antenna element and each receive antenna element calculated from the receive signals. The circuitry estimates the position of the organism by using the second matrix, and calculates a radar cross-section value with respect to the organism, based on the estimated position and the positions of the transmit antenna and the receive antenna. The circuitry then estimates the posture of the organism by using the calculated radar cross-section value and information indicating associations between radar cross-section values and postures of the organism.
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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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