-
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.
-
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.
-
公开(公告)号：US12270924B2
公开(公告)日：2025-04-08
申请号：US17609288
申请日：2021-02-17
Inventor： Shoichi Iizuka , Takeshi Nakayama , Naoki Honma , Nobuyuki Shiraki
IPC: G01S5/02
Abstract: A sensor includes: a complex transfer function calculator that calculates a complex transfer function representing propagation characteristics between each N transmission antenna element and each M reception antenna element, using radio waves transmitted as a reception signal in a space where at least one living body is present from each N transmission antenna element and received by each M reception antenna element; a spectrum calculator that: calculates likelihood spectra, each indicating a likelihood of presence of each living body, by an estimation algorithm for estimating the presence from living body information that is a living body component in the complex transfer function, using different values as the number of the at least one living body; and calculates an integrated spectrum by integrating the likelihood spectra calculated; and an estimator that estimates living body information indicating at least the number of living bodies, and outputs the living body information estimated.
-
公开(公告)号：US10969479B2
公开(公告)日：2021-04-06
申请号：US16240919
申请日：2019-01-07
Inventor： Shoichi Iizuka , Takeshi Nakayama , Naoki Honma , Dai Sasakawa , Yukio En
Abstract: There is provided an estimation device that estimates a living body orientation. The estimation device includes: transceivers that transmit transmission signals using M transmission antenna elements arranged to surround a predetermined range including a living body, and receive reception signals using N receiving antenna elements; and a circuit that, for each of M sets of N reception signals corresponding to transmitted M transmission signals, performs calculation of a characteristic quantity based on the N reception signals included in the set, the characteristic quantity with a greater value indicating a waveform having a larger amplitude and higher regularity, identifies a first transmission antenna element corresponding to a first characteristic quantity having a greatest value among M characteristic quantities by comparing the M characteristic quantities obtained by the calculation with each other, and estimates the living body orientation to indicate a predetermined direction based on the first transmission antenna element identified.
-
公开(公告)号：US10914829B2
公开(公告)日：2021-02-09
申请号：US15865956
申请日：2018-01-09
Inventor： Takeshi Nakayama , Shoichi Iizuka , Naoki Honma
IPC: G01S13/48 , G01S5/02 , G01S3/04 , G01S13/00 , G01S3/74 , G01S7/41 , G01S3/28 , G01S13/88 , G01S13/42 , G01S13/02
Abstract: A positioning sensor includes m receiving antennas connected to a feeder circuit and n variable loads, and a receiver that receives a first signal via the m receiving antennas. The positioning sensor further includes a memory that stores a first signal strength value of a first signal that the receiver receives when a variable load varies in value, and a processor that calculates a second signal strength value from a complex propagation channel, searches for a complex propagation channel candidate that has a minimum difference between a first signal strength and a second signal strength, determines the complex propagation channel candidate to be a complex propagation channel when the receiver receives the first signal, and estimates an incoming direction of the first signal from the determined complex propagation channel.
-
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.
-
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.
-
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.
-
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.
-
公开(公告)号：US12220231B2
公开(公告)日：2025-02-11
申请号：US17612362
申请日：2020-12-28
Inventor： Takeshi Nakayama , Shoichi Iizuka , Naoki Honma , Nobuyuki Shiraki , Teppei Hayashi , Kazuki Numazaki
IPC: G01S13/88 , A61B5/107 , A61B5/1171 , G01S3/14 , G01S7/02 , A61B5/00 , A61B5/0507 , A61B5/11 , G01S7/41 , G01S13/00 , G01S13/87
Abstract: An estimation device includes: M transmission antenna elements each transmitting a first transmission signal; N transmitter-receivers each including a reception antenna element and receiving, over a predetermined period, a first reception signal including a reflection signal that is the first transmission signal reflected by a first living body, using the reception antenna element; a memory storing training signals that are second reception signals obtained by causing the N transmitter-receivers to preliminarily receive second reception signals including reflection signals that are second transmission signals transmitted from the M transmission antenna elements to a second living body and reflected therefrom; a first vector calculator calculating a first vector for each training signal and each first reception signal by respective predetermined methods; and a circuit identifying the first living body or estimating an orientation of the first living body by a predetermined method, using correlation coefficients calculated from the first vectors.
-
-
-
-
-
-
-
-
-
Search Results
22
records
(took 0.02 seconds)
