US 12,253,622 B2
Doppler radar coexistence
Jonny Eriksson, Sjövik (SE); and Christer Andersson, Gothenburg (SE)
Assigned to Topgolf Sweden AB, Danderyd (SE)
Filed by Topgolf Sweden AB, Danderyd (SE)
Filed on Oct. 9, 2023, as Appl. No. 18/378,075.
Application 18/378,075 is a continuation of application No. 18/168,239, filed on Feb. 13, 2023, granted, now 11,815,618.
Claims priority of application No. 2230046-1 (SE), filed on Feb. 17, 2022.
Prior Publication US 2024/0125892 A1, Apr. 18, 2024
Int. Cl. G01S 7/02 (2006.01); G01S 13/58 (2006.01)
CPC G01S 7/023 (2013.01) [G01S 7/0232 (2021.05); G01S 7/0235 (2021.05); G01S 13/584 (2013.01)] 27 Claims
OG exemplary drawing
 
1. A method for providing reduced interference for at least two co-located Frequency Modulated Continuous Wave (FMCW) Doppler radars, each of the FMCW Doppler radars being used in a system to detect respective distances to and velocities of objects moving through space in relation to each of the FMCW Doppler radars, the method comprising:
determining expected electromagnetic wave propagation times between pairs of the FMCW Doppler radars, wherein determining the expected electromagnetic wave propagation times comprises each FMCW Doppler radar receiving an electromagnetic test signal and determining a maximum detected propagation time of the electromagnetic test signal, taking into consideration any multi-path wave trajectories, and wherein the received electromagnetic test signal has at least a predetermined minimum power at reception;
selecting different respective sweep time offsets with respect to each FMCW Doppler radar in a first group of the FMCW Doppler radars; and
selecting a second non-zero sweep frequency offset with respect to a second group of the FMCW Doppler radars, the second non-zero sweep frequency offset being relative to a sweep frequency pattern used for FMCW Doppler radars belonging to the first group, wherein the first group and the second group are disjoint groups of FMCW Doppler radars.