基于FFH/MFSK的深海远程水声通信技术

为实现深海远程水下通信,提出了一种FFH（Fast Frequency Hopping）/MFSK（快跳频/多频移键控）通信方案。该方案利用快跳频技术对已调MFSK信号进行二次调制,借助频率分集,可有效地抑制远程水声信道因多途传播而引起的频率选择性衰落,从而更好地实现远程低信噪比条件下可靠通信。同时采用深海声道作为通信系统水声波导,将通信节点置于声道轴以大幅提高通信距离。仿真及湖试结果证明了所提方案的良好性能。

Research on FFH/MFSK long range deep-water acoustic communication technique

The FFH/MFSK communication scheme is proposed for long range deep-water acoustic communication.The scheme employs fast frequency hopping（FFH） to suppress severe multipaths interference effectively and reduce bit error rate.Using the characters of the deep-water acoustic channel and putting the communication modems at the depth corresponding to the minimal sound velocity value can improve the range of communication efficiently.The results of simulation and experiment show that proposed method has outstanding advantage in performance of bit error rate（BER）.