Patent · US Active

Sub-decimeter radio frequency ranging

US9961495B2 · kind B2 · utility

4Cited by

1References

23Claims

0Family size

Assignee

Massachusetts Institute of Technology · US

Inventors

Dina Katabi · Cambridge, US
Deepak Vasisht · Cambridge, US
Swarun Suresh Kumar · Cambridge, US

Key dates

Filing date	Mar 17, 2016
Grant date	May 1, 2018
Priority date	—
Expiry date	Mar 17, 2036

Classification

Technology area (CPC H)Electricity
CPC primaryH04L43/0852
WIPO fieldDigital communication
WIPO sectorElectrical engineering

Abstract

A system enables a single WiFi access point to localize clients to within tens of centimeters. Such a system can bring indoor positioning to homes and small businesses which typically have a single access point. A key enabler underlying the system is a novel algorithm that can compute sub-nanosecond time of flight using commodity WiFi cards. By multiplying the time of flight with the speed of light, a Wifi access point computes the distance between each of its antennas and the client, hence localizing it. An implementation on commodity WiFi cards demonstrates that the system's accuracy is comparable to state-of-the-art localization systems, which use four or five access points.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.