ALEXANDRIA, Va., June 10 -- United States Patent no. 12,292,498, issued on May 6, was assigned to SEMTECH Corp. (Camarillo, Calif.).
"Doppler ranging system" was invented by Olivier Bernard Andre Seller (Sainte-Soulle, France) and Christophe Jean Jacques Devaucelle (Boudevilliers, Switzerland).
According to the abstract* released by the U.S. Patent & Trademark Office: "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...