Patent ID: 11893885
Assignee: NATIONAL CENTRAL UNIVERSITY
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 16:
17. The system for parking detection and identification of the moveable apparatus according to claim 15, wherein after said unique identifier is obtained, said magnetic field generator stops generating said magnetic field signal, a rear stage first magnetic field measurement and a rear stage second magnetic field measurement are measured by said first magnetic field sensor and said second magnetic field sensor respectively, said data processing unit calculates a rear stage magnetic field measurement difference, wherein said rear stage magnetic field measurement difference is a magnitude of a difference of said rear stage first magnetic field measurement and said rear stage second magnetic field measurement, or a magnitude of a difference of a rear stage first magnetic field component of said rear stage first magnetic field measurement along said characteristic direction and a rear stage second magnetic field component of said rear stage second magnetic field measurement along said characteristic direction, wherein a second near magnetic field variation for detecting said moveable apparatus leaving said moveable apparatus parking place is occurred when said rear stage magnetic field measurement difference is continuously smaller than a second characteristic threshold within a second characteristic time period, or an average value of said rear stage magnetic field measurement difference is smaller than a second characteristic average threshold within a second characteristic average time period.