US 12,276,757 B2
Systems and methods for tracking a position of a rotating platform of a lidar system
Mark Entwistle, New Egypt, NJ (US); Bayard G. Gardineer, IV, Princeton, NJ (US); Gary Burkholder, Morgan Hill, CA (US); and Chris J. Trowbridge, Dexter, MI (US)
Assigned to LG INNOTEK CO., LTD., Seoul (KR)
Filed by LG INNOTEK CO., LTD., Seoul (KR)
Filed on Feb. 19, 2021, as Appl. No. 17/180,260.
Prior Publication US 2022/0268895 A1, Aug. 25, 2022
Int. Cl. G01S 7/481 (2006.01); G01B 7/30 (2006.01); G01D 5/14 (2006.01); G01P 3/32 (2006.01); G01P 3/44 (2006.01); G01S 17/931 (2020.01)
CPC G01S 7/4817 (2013.01) [G01B 7/30 (2013.01); G01D 5/145 (2013.01); G01P 3/44 (2013.01); G01S 17/931 (2020.01); G01D 2205/20 (2021.05); G01P 3/32 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A LIDAR assembly comprising:
a first portion and a second portion configured to rotate relative to one another;
a first magnet located on the second portion and arranged with a north pole of the first magnet facing a first radial direction;
a second magnet located on the second portion and arranged with a south pole of the second magnet facing the first radial direction;
a first sensor located on the first portion, wherein the first sensor is further configured to measure a first magnetic field of the first magnet and a second magnetic field of the second magnet as the first portion and second portion rotate relative to one another;
memory that stores computer-executable instructions; and
a processor configured to access the memory, wherein the processor is configured to execute the computer-executable instructions to:
receive from the first sensor, as the first portion and the second portion rotate relative to one another, a first magnetic field measurement based on proximity of the first magnetic field of the first magnet to the first sensor;
receive, from the first sensor, a second magnetic field measurement based on proximity of the second magnetic field of the second magnet to the first sensor; and
calculate a position of the first sensor relative to the second portion based on the first magnetic field measurement and the second magnetic field measurement;
a third magnet, located on the second portion of the LIDAR assembly, the third magnetic magnet having a north pole that is facing a second direction, and wherein the second direction is orthogonally magnetic to the first radial direction; and
a second sensor, located on the second portion of the LIDAR assembly, the second sensor being configured to measure a magnetic field of the third magnet.