US 11,675,040 B2
Dual magnetometer calibration
Scott J. Carter, Seal Beach, CA (US); Ho Man M. Fong, Irvine, CA (US); Ryan M. Morrison, Costa Mesa, CA (US); and Narayanan V. Ramanathan, Lake Forest, CA (US)
Assigned to Gatekeeper Systems, Inc., Foothill Ranch, CA (US)
Filed by Gatekeeper Systems, Inc., Foothill Ranch, CA (US)
Filed on Dec. 18, 2020, as Appl. No. 17/126,595.
Application 17/126,595 is a continuation of application No. PCT/US2019/037201, filed on Jun. 14, 2019.
Claims priority of provisional application 62/689,526, filed on Jun. 25, 2018.
Prior Publication US 2021/0141044 A1, May 13, 2021
Int. Cl. G01R 35/00 (2006.01); G01R 33/02 (2006.01); G01R 33/06 (2006.01)
CPC G01R 35/005 (2013.01) [G01R 33/0206 (2013.01); G01R 33/063 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A magnetic sensor comprising:
a magneto-impedance (MI) magnetometer;
a magneto-resistive (MR) magnetometer;
a temperature sensor;
non-transitory storage configured to store a temperature correction database that provides temperature-calibration parameters for the MI magnetometer and an MI-MR measurement pair database; and
a processor in communication with the non-transitory storage, the MI magnetometer, the MR magnetometer, and the temperature sensor, the processor programmed to:
receive a first magnetic reading from the MI magnetometer;
receive a temperature from the temperature sensor;
determine if the temperature is represented in the temperature correction database;
in response to a determination that the temperature is represented in the temperature correction database:
apply the temperature-calibration parameters from the temperature correction database to the first magnetic reading to provide a first temperature-calibrated magnetic reading; and
output the first temperature-calibrated magnetic reading;
in response to a determination that the temperature is not represented in the temperature correction database:
receive a second magnetic reading from the MR magnetometer;
analyze the MI-MR measurement pair database to determine at least one temperature calibration parameter for the MI magnetometer;
apply the at least one temperature calibration parameter to the first magnetic reading to provide a second temperature-calibrated magnetic reading;
store the at least one temperature calibration parameter in the MI-MR measurement pair database; and
output the second temperature-calibrated magnetic reading.