Patent ID: 9739865
Date: 2017-08-22
CPC Classifications: G01S,G07C

Claim:
1. A method for identifying an object's passing route direction, wherein the method is applied to a system that comprises at least one group of vector beacons placed at preset intervals, wherein each group comprises two vector beacons, and each group of vector beacons alternatively send two low-frequency signals carrying different attribute codes according to a preset sequence, the two low-frequency signals form two low-frequency electromagnetic fields which are partially overlapped in space, and the preset interval enables the area of the overlapped part of the two low-frequency electromagnetic field to be no less than 70% of the total area of the electromagnetic fields or the maximum extension width of the independence part to be less than 1 m, and the method comprises: when the object is in a whole process from entering to separating from a region inducted by the low-frequency electromagnetic field, receiving the low-frequency signal of the low-frequency electromagnetic field in real time; extracting the attribute code and signal intensity corresponding to the low-frequency signal received and conducting associate storage; and after the object separates from the region inducted by the low-frequency electromagnetic field, determining the object's route direction along which the object passes through the vector beacons according to the attribute code and signal intensity stored.