Magnetic Field Sensor Phase Detection for Boundary Crossing

The patent changes the detection parameter from signal amplitude or presence to phase relationship between two magnetic field components. By using phase difference detection instead of relying on DC components or specific signal forms, the system achieves reliable boundary crossing detection without complex signal generation requirements. The phase relationship provides a robust indicator that remains effective across various signal types.

The detection device using two magnetic field sensors with different sensitivity directions can detect boundary crossings across multiple signal types (modulated, unmodulated, symmetrical, asymmetrical carriers) without requiring specific signal generation equipment. This universal detection approach eliminates the need for DC components or specialized signal forms while maintaining detection reliability across different magnetic field generation methods.

The patent introduces a second dimension of detection by using two magnetic field sensors with different main sensitivity directions. This dimensional approach allows the system to measure the phase relationship between orthogonal magnetic field components, providing precise boundary crossing detection. The additional sensor dimension enables phase-based detection without requiring complex signal processing or multiple sensors in the same direction.

The patent employs asymmetry in sensor orientation rather than symmetry in signal form. By configuring sensors with different sensitivity directions (orthogonal or at different angles), the system achieves precise phase relationship measurement. This asymmetric sensor arrangement provides robust detection capability while maintaining simple signal generation requirements, avoiding the need for symmetrical signal forms or complex sensor arrays.

The detection device can identify boundary crossings and trigger wheel lock deactivation across multiple scenarios (single buried line, second buried line, or mobile device) using the same phase relationship detection mechanism. This universal detection approach maintains system versatility while avoiding the need for complex additional equipment or configuration changes in each scenario.

The phase relationship detection system automatically identifies boundary crossings and can autonomously trigger wheel lock deactivation without requiring additional buried lines or mobile devices. The system serves itself by using the same detection mechanism for both boundary identification and deactivation triggering, eliminating the need for separate deactivation infrastructure and reducing overall system complexity.