Estimating location using multi-antenna radio receiver
US8086248B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 16, 2008 |
| Grant date | Dec 27, 2011 |
| Priority date | — |
| Expiry date | Oct 11, 2030 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W4/20
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Packets are periodically transmitted by a plurality of radio beacons deployed at known positions over a location estimation area. Monitoring is conducted for incoming packets. Upon receipt of a packet from a kth one of the beacons, received signal strength, RSSI, is measured at each of the antenna outputs, the packet is decoded to obtain the unique identifier and the unique sequence number, and the received signal strength at each of the antenna outputs is spatially averaged. The measuring, decoding, and spatial averaging are repeated for additional packets from the kth one of the beacons during a pre-defined time window T. The plurality of spatially averaged received signal strengths are temporally averaged over the pre-defined time window T, to obtain a spatially and temporally averaged value of received signal strength. The distance dk from the apparatus to the kth one of the beacons is approximated based on the spatially and temporally averaged value of received signal strength. The approximate distance dk is designated as {circumflex over (d)}k. This is repeated for the K beacons that have successfully transmitted packet(s) during the pre-defined time window, k=1 to K. The loc…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.