Patent · US Expired

Determining wireless device locations

US6618005B2 · kind B2 · utility

45Cited by
7References
23Claims
0Family size

Assignee

Inventors

Key dates

Filing dateJun 29, 2001
Grant dateSep 9, 2003
Priority date—
Expiry dateJun 29, 2021

Classification

  • Technology area (CPC G)Physics
  • CPC primaryG01S5/145
  • WIPO fieldMeasurement
  • WIPO sectorInstruments

Abstract

Wireless network devices can obtain their geographical location by triangulating with access points that have precise time information. In response to a location prompt, a wireless device can send a transmission to multiple access points that are within its range. The different times at which the transmission is received at different access points can be collected and forwarded to a server, which can compute the location of the wireless device using triangulation techniques. The access points can calibrate their own time bases from time services received from global position satellites.

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