| 摘要 |
A method of determining the position of a transponder in relation to a communicator, wherein the transponder (9) can be read by a communicator (11) which is adapted to send an inquiry signal to the transponder, wherein the transponder (9) is adapted to answer the inquiry signal and therewith transfer information from a memory in the transponder and wherein the communicator (11) is connected to a principal data system (16) and is adapted to receive the information. The method is characterized by connecting the communicator (11) to an envelope detector (15) which is caused to detect the envelope of the signal received from the transponder (9); and by determining the relative position between the transponder (9) and the communicator (11) from the envelope. |
