Magnetic Marker Detection Calibration for Uniform Sensor Sensitivity

The patent applies parameter changes by introducing a calibration coefficient for each magnetic sensor that adjusts its output based on individual characteristics. The calibration coefficient is determined by comparing sensor outputs when a known magnetic field is applied, and then used to correct subsequent measurements. This transforms the sensor output parameter to compensate for individual differences, resolving the contradiction between using multiple sensors for accuracy and maintaining output uniformity.

The patent implements feedback by using the calibration coefficients derived from initial characterization to continuously correct sensor outputs during operation. The system feeds back the individual sensor characteristics into the measurement process, allowing each sensor's unique properties to be compensated for in real-time, thereby maintaining reliability while preserving the benefits of multiple-sensor differential measurement.

The patent applies preliminary action by performing calibration during the sensor manufacturing or initial installation phase. The calibration coefficients are determined in advance when the sensors are stationary and can be accessed by a technician or automated system. This preliminary calibration eliminates the need for frequent re-calibration during vehicle operation, significantly reducing user burden while maintaining measurement precision throughout the sensor's operational life.

The patent implements self-service by enabling the calibration process to be performed automatically using the vehicle's existing magnetic field environment and onboard computing resources. The system can characterize the sensors and determine calibration coefficients without requiring external calibration equipment or technician intervention, making the process self-contained and eliminating operational complexity for the user.