公开(公告)号：US11976933B2

公开(公告)日：2024-05-07

申请号：US17617984

申请日：2019-06-11

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Hirofumi Abe ,  Keihiro Ochiai ,  Hitoshi Seshimo

IPC: G01C21/36 ,  G01C21/32 ,  G01S19/39 ,  G01S19/40 ,  G01S19/42 ,  H04W4/02 ,  H04W4/024

CPC classification number: G01C21/367 ,  G01C21/32 ,  G01C21/362 ,  G01S19/393 ,  G01S19/40 ,  G01S19/42 ,  H04W4/024 ,  H04W4/025

Abstract: A link combination extraction unit (24) acquires all the combination of link candidates from among link candidates having an angle with respect to a movement direction of a pedestrian equal to or smaller than a threshold value among link candidates for n walking route networks. The link combination extraction unit (24) acquires all the combinations of link candidates that do not intersect with each other among the acquired combinations of link candidates. The link combination extraction unit (24) acquires all the combinations of link candidates that do not connect to each other among the acquired combinations of link candidates. The link combination extraction unit (24) acquires all the combinations of link candidates that are not on the same straight line among the acquired combinations of link candidates. A candidate determination unit (26) acquires a combination of link candidates closest to position information of a pedestrian when there are a plurality of acquired link candidates.

公开(公告)号：US11689301B2

公开(公告)日：2023-06-27

申请号：US17054415

申请日：2019-04-22

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Hirofumi Abe ,  Keihiro Ochiai ,  Hitoshi Seshimo

IPC: H04B17/318 ,  G01S5/02 ,  H04W64/00

CPC classification number: H04B17/318 ,  G01S5/02524 ,  G01S5/02525 ,  H04W64/00

Abstract: Time and effort to generate an electric field map to realize high-accuracy positioning is reduced. In an electric field map generation device (10) that generates an electric field map in which RSSI obtained when radio waves transmitted from a beacon (60) are observed at each of a plurality of points in the same space is associated with each of coordinates at the plurality of points, a radio wave strength acquisition unit (12) acquires RSSI observed at each of at least three observation points different in distance from the beacon (60), a space propagation characteristics estimation unit (14) estimates space propagation characteristics of the radio waves transmitted from the beacon (60) in the same space using the acquired RSSI at the observation points, a radio wave strength estimation unit (16) estimates RSSI at estimation points on the basis of the estimated space propagation characteristics and distances between the estimation points different from the observation points and the beacon (60), and a generation unit (18) generates the electric field map (26) using the RSSI at the observation points and the estimation points.