| 摘要 |
<p>An anti-collision method for reading cards by using automatic frequency hopping is provided, which is used for a system in which a reader simultaneously reads a plurality of cards in RFID technique. The method includes: the read cards and the reader both are set to have functions which are the automatic sweep frequency and hopping from the current channel to access to another channel, and store the accessing address and the transaction address; when the reader is in the frequency hopping seeking cards state, the reader is in the frequency hopping working state of the n frequency channels, in which the accessing address of each channel is the same, the reader reads the cards by means of in turn and circulating frequency hopping in the n frequency channels. The reader checks whether there is the collision of two cards or more than two cards, the reader randomly sends the command of the frequency hopping, and makes all the reading cards, which the collision occurs, hop to another channel to waiting for accessing randomly.</p> |
