Methods and systems for synchronized infrared real time location
US9231699B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 19, 2012 |
| Grant date | Jan 5, 2016 |
| Priority date | — |
| Expiry date | Oct 24, 2033 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W4/80
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
Systems for determining a location of a portable device are provided. The system includes stationary infrared (IR) base stations, portable devices and at least one radio frequency (RF) transceiver. At least two of the IR base stations receive timing synchronization information and transmit corresponding IR location codes in a time period based on the received timing synchronization information. Each IR location code is representative of a location of the corresponding IR base station. Each portable device detects the IR location codes and, if one of the IR location codes is detected, transmits an output signal including a portable device ID representative of the portable device and the detected IR location code. The RF transceiver periodically provides, upon a request, the timing synchronization information to the respective IR base stations relative to a unified time of origin.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.