Semtech Corporation
DOPPLER RANGING SYSTEM

Last updated:

Abstract:

An extension of the LoRa modulation with an improved ranging mode. A master and a slave device exchange a request and a reply that contain sequences of chirps that are carefully aligned in time, frequency, and preferably also phase, such that the master device can ascertain the propagation delay to the slave by demodulating the reply. Request and reply include chirps having different slopes, preferably slopes of equal absolute value and opposite sign. The slope diversity permits an unbiased estimation of the Doppler shift.

Status:
Application
Type:

Utility

Filling date:

23 Nov 2021

Issue date:

16 Jun 2022