Patent ID: 9645202
Date: 2017-05-09
CPC Classifications: G01R

Claim:
1. A geomagnetic sensor calibration apparatus comprising: a geomagnetic sensor configured to measure at least one value of Earth's magnetic field; and a processor configured to: estimate first central points from the at least one measured value of the Earth's magnetic field by using a first linear function, estimate second central points by using a second linear function and the estimated first central points, determine whether calibration of the geomagnetic sensor is necessary based on the estimated first central points, and control the central point estimator to estimate second central points based on a result of the determination, and calculate a mean value and a standard deviation value of distances between a plurality of sampling coordinates output from the geomagnetic sensor and the estimated first central points, and determine whether calibration of the geomagnetic sensor is necessary based on whether at least one of the calculated average value and standard deviation value exceeds a preset value.