Systems and methods for learning wireless transceiver locations and updating a spatially-dependent path-loss model
US10117065B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 1, 2017 |
| Grant date | Oct 30, 2018 |
| Priority date | — |
| Expiry date | Jun 1, 2037 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W88/08
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An indoor positioning system determines the location of a mobile device by comparing measured signal strengths to a database determined via offline calibration. Automated maintenance and repair of the database are facilitated by accurately characterizing indoor radio signal propagation. Systems and methods for generating spatially-dependent path-loss models are disclosed. In one variation, a computer-implemented method of generating a spatially-dependent path-loss model involves dividing a coordinate-plane representing an indoor environment into non-overlapping tiles; obtaining transmit and received signal strengths of radio signals generated by a calibration device at a number of reference points and measured at a number of wireless access points; calculating vectors which represent the traversal distances of the tiles by each of the radio signals; and solving a system of path-loss equations relating the transmit signal strengths, the received signal strengths, and the distance vectors to determine values for tile-specific path-loss coefficients for each of the tiles.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.