Patent · US Active

Radio frequency distance determination

US11846695B2 · kind B2 · utility

0Cited by

0References

14Claims

0Family size

Assignee

Nordic Semiconductor ASA · NO

Inventors

Daniel Ryan · Sycamore, US
Per Erik Sandgren · Sala, SE
Carsten Wulff · Trondheim, NO

Key dates

Filing date	Nov 30, 2021
Grant date	Dec 19, 2023
Priority date	—
Expiry date	Jan 12, 2042

Classification

Technology area (CPC H)Electricity
CPC primaryH04L25/0214
WIPO fieldMeasurement
WIPO sectorInstruments

Abstract

A method of determining a distance between a radio frequency device and a target is disclosed in which the radio frequency device receives a radio frequency signal from the target. The method comprises determining a time domain channel response from the received radio frequency signal, determining an amplitude of a largest peak in the time domain channel response, determining an amplitude of a second, earlier, peak in the time domain channel response, comparing the second peak amplitude to a threshold based on the largest peak amplitude, identifying the largest peak as a shortest path peak if the second peak amplitude is less than the threshold, identifying the second peak as a shortest path peak if the second peak amplitude is greater than the threshold, and calculating the distance between the radio frequency device and the target based on a time corresponding to the shortest path peak.

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