公开(公告)号：US20190079159A1

公开(公告)日：2019-03-14

申请号：US15701601

申请日：2017-09-12

Applicant: Cisco Technology, Inc.

Inventor： Huy Phuong Tran ,  Santosh G. Pandey

IPC: G01S5/06 ,  G01C21/20 ,  H04W4/04 ,  H04W4/02

Abstract: A method including obtaining location estimates of a wireless mobile device inside a structure based on wireless signals transmitted by the wireless mobile device and received at a plurality of wireless access points, wherein the inside of the structure is represented by a plurality of path segments; modeling a transition from a first estimated location of the wireless mobile device to a second estimated location of the wireless mobile device by minimizing a ratio of an angle to a length between the first estimated location and the second estimated location; selecting, based on the modeling a particular path segment of the plurality of path segments; and aligning the second estimated location of the mobile device to the particular path segment. An apparatus and a computer-readable storage media implementing the method are also disclosed.

公开(公告)号：US09949083B1

公开(公告)日：2018-04-17

申请号：US15296349

申请日：2016-10-18

Applicant: Cisco Technology, Inc.

Inventor： Shaun Kirby ,  Justin J. Muller ,  Jagadish Chundury ,  Victor T. To ,  Santosh G. Pandey

IPC: H04M11/04 ,  H04W4/00 ,  H04W24/00 ,  H04W4/02 ,  H04B5/00 ,  G01S15/06

CPC classification number: H04W4/023 ,  G01S15/06 ,  H04B5/0062

Abstract: A system and method for improved location tracking of a target device based on location estimates for multiple types of location technologies/sensor types. A received signal strength location estimate of a target device based on wireless transmissions made by the target device received at a plurality of receiver devices at known locations in a location region. A first search area for the target device is derived based on the received signal strength location estimate. An ultrasound based area in which the target device is estimated to be is derived based on reception by the target device of a particular ultrasound beacon in the location region. An intersection of the first search area and the ultrasound based area is computed to produce a second search area. A location estimate of the target device in the second search area is computed based at least on the received signal strength location estimate.