US 12,270,924 B2
Estimation device, estimation method, and recording medium
Shoichi Iizuka, Osaka (JP); Takeshi Nakayama, Hyogo (JP); Naoki Honma, Iwate (JP); and Nobuyuki Shiraki, Iwate (JP)
Assigned to PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD., Osaka (JP)
Appl. No. 17/609,288
Filed by Panasonic Intellectual Property Management Co., Ltd., Osaka (JP)
PCT Filed Feb. 17, 2021, PCT No. PCT/JP2021/005890
§ 371(c)(1), (2) Date Nov. 5, 2021,
PCT Pub. No. WO2021/172126, PCT Pub. Date Sep. 2, 2021.
Claims priority of application No. 2020-031770 (JP), filed on Feb. 27, 2020.
Prior Publication US 2022/0214421 A1, Jul. 7, 2022
Int. Cl. G01S 5/02 (2010.01)
CPC G01S 5/02 (2013.01) 14 Claims
OG exemplary drawing
 
1. An estimation device, comprising:
a complex transfer function calculator that calculates a complex transfer function representing propagation characteristics between each of N transmission antenna elements and each of M reception antenna elements, using radio waves that are transmitted in a space as a reception signal from each of the N transmission antenna elements and received by each of the M reception antenna elements, where N and M are natural numbers greater than or equal to two, the space being a space in which at least one living body is present;
a spectrum calculator that:
(a) calculates likelihood spectra by use of an estimation algorithm for estimating presence of each of the at least one living body from living body information, using a total number of the at least one living body as a variable, the variable being changed when calculating the likelihood spectra, the likelihood spectra each indicating a likelihood of the presence, the living body information being a living body component included in the complex transfer function; and
(b) calculates an integrated spectrum by integrating the likelihood spectra calculated by changing the variable; and
an estimator that estimates, from the integrated spectrum, living body information indicating at least the total number of the at least one living body that is present in the space, and outputs the living body information estimated.