US 12,345,780 B1
Mitigating external magnetic fields on magnetic angle sensors
Alec Berg, San Mateo, CA (US); Jose Melendez, Mountain View, CA (US); Damien Dusha, Mountain View, CA (US); Alexander Zbrozek, Mountain View, CA (US); and Craig Robinson, Santa Clara, CA (US)
Assigned to Waymo LLC, Mountain View, CA (US)
Filed by Waymo, LLC, Mountain View, CA (US)
Filed on May 5, 2021, as Appl. No. 17/308,817.
Int. Cl. G01R 33/025 (2006.01); B60R 11/00 (2006.01); B60R 11/02 (2006.01); G01B 7/30 (2006.01); G01R 33/00 (2006.01)
CPC G01R 33/025 (2013.01) [B60R 11/0258 (2013.01); G01B 7/30 (2013.01); G01R 33/0094 (2013.01); B60R 2011/0085 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A system comprising:
a rotating platform having an axis of rotation;
at least one magnet producing a local magnetic field;
a first magnetic field sensor; and
a second magnetic field sensor, wherein the first magnetic field sensor is circumferentially spaced from the second magnetic field sensor by an angle Θa, the first magnetic field sensor and the second magnetic field sensor have a magnetic angular difference of Θm, and Θa+Θm is substantially equal to 180 degrees such that a combined reading of the first and second magnetic field sensors substantially reduces the influence of an external magnetic field on a measurement of the local magnetic field, and
wherein the at least one magnet or both the first magnetic field sensor and the second magnetic field sensor are coupled to the rotating platform.