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

Claim 2:
3. The method for parking detection and identification of the moveable apparatus according to claim 1, wherein after said unique identifier is obtained, said method further comprises following steps of:
stopping generating said magnetic field signal by said magnetic field generator;
measuring magnetic field by said first magnetic field sensor and said second magnetic field sensor respectively, wherein 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; and
calculating a rear stage magnetic field measurement difference by said data processing unit, 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.