| 摘要 |
<p>PROBLEM TO BE SOLVED: To quickly and surely acquire synchronization. SOLUTION: This frequency hopping transmitter-receiver has an S-FH (slow hopping) controlling part 26 and an SS-FH (super slow hopping) controlling part 28 and a frequency hopping synthesizer 30. At the time of sending a data signal of frequency hopping communication, the data signal is sent by hopping a sending channel of the synthesizer 30 which is controlled by the part 26 in a prescribed hopping cycle. On the other hand, at the time of synchronous acquisition, a synchronizing acquisition signal is sent by hopping a sending channel that is controlled by the part 28 in a cycle which is longer enough than the hopping cycle. With this, the hopping change of a sending channel at the time of synchronous acquisition becomes slower enough than the hopping change of a sending channel at the time of data transmission.</p> |
