| 摘要 |
A method of producing location information relating to articles (e.g. 9o) utilizes tag devices (10, 1112,•••)•The method comprises the steps of:•the tag devices (e.g. I0), when in each other's proximity, exchanging identification data and storing the time and date of the exchange together with the identification data of the other tag device, and also storing data relating to previous exchanges,•the tag devices, when in the proximity of an information collection device (e.g. 2o), communicating the stored times and dates together with the stored identification data to an information collection device,•the information collection device (20) transmitting the times and dates and the identification data received from the tag devices to a central processing device (3), and•the central processing device (3) deriving location information from the times and dates and the identification data. Each tag device (e.g. 1o), during each encounter with another tag device (e.g. 11), also exchanges and stores encounter data relating to previous encounters, such that the encounter data which each tag device communicates to an information collection device (e.g. 2o) may relate to encounters of a plurality of tag devices. |
