US 12,228,666 B2
Mitigation of impact of oscillator error on doppler estimation for radio frequency sensing
Weimin Duan, San Diego, CA (US); June Namgoong, San Diego, CA (US); and Hyojin Lee, San Diego, CA (US)
Assigned to QUALCOMM Incorporated, San Diego, CA (US)
Filed by QUALCOMM Incorporated, San Diego, CA (US)
Filed on Jul. 6, 2022, as Appl. No. 17/858,573.
Prior Publication US 2024/0012086 A1, Jan. 11, 2024
Int. Cl. G01S 5/02 (2010.01)
CPC G01S 5/0246 (2020.05) [G01S 5/0236 (2013.01)] 28 Claims
OG exemplary drawing
 
1. A method performed by a first sensing entity for supporting dual direction bistatic radio frequency (RF) sensing, comprising:
transmitting a first sensing signal to be reflected by a target object and received by a second sensing entity;
receiving, from the second sensing entity, a first frequency offset that is measured based on the first sensing signal, wherein the first frequency offset is associated with a first oscillator error;
receiving a second sensing signal that is transmitted by the second sensing entity and reflected by the target object;
measuring a second frequency offset of the second sensing signal, wherein the second frequency offset is associated with a second oscillator error; and
estimating a velocity of the target object based on averaging the first frequency offset and the second frequency offset for cancelling the first oscillator error and the second oscillator error.