| 摘要 |
The invention relates to a tracking system comprising a plurality of portable marking units, at least one position data element, at least one data transfer element and at least one central processing server. The marking units comprise each an energy supply unit, at least one memory element, an identification code, a receiver for wireless receiving data, and a transmitter for wireless transmitting data. The marking units comprise a standard mode in which mode they are arranged to automatically communicate with each other when within a predetermined distance d1 from each other. The position data element comprises a transmitter for wireless transmitting a position data to any of the marking units which are within a predetermined distance d2 from the position data element. The data transfer element comprises a receiver for wireless receiving data transmitted from any of the marking units which are within a predetermined distance d3 from the data transfer element, and a transmitter for transmitting the data to the central processing server. The central processing server comprises a processing unit for processing the received data to extract data related to at least one historical position of a selected marking unit. The position data element and the data transfer element may be integrated with each other.
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