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针对常规的连续载波调制扩频通信方式容易通过能量检测的方法被截获的问题,提出了一种猝发的混合扩频水声隐蔽通信方式,该方法通过在时间上随机的发送脉冲混合调制扩频信号来降低截获概率,而且可以比较灵活的通过调整平均占空比来满足不同隐蔽性的要求,但是该隐蔽性是以牺牲通信速率为代价的。猝发信号中混合了二进制相位键控(BPSK)、循环移位键控(CSK)和多进制频移键控(MFSK)扩频调制方式,采用自同步和时频二维搜索算法实现码元和载波同步。通过仿真分析了猝发通信系统的隐蔽性能和多途信道下的误码性能,并且通过了南海海试验证了算法的性能,在5 km的通信距离上,4 kHz的带宽内,单个脉冲信号的通信速率可以达到317 bps,误码率达到10~(-3)以下。
Aiming at the problem that conventional continuous carrier modulation spread spectrum communication method is easily intercepted by the energy detection method, a burst mixed spread-spectrum underwater acoustic concealment communication method is proposed. The method spreads the frequency by a random transmit pulse hybrid modulation in time, Signal to reduce the probability of interception, but also can be more flexible by adjusting the average duty cycle to meet the requirements of different concealment, but the concealment at the expense of communication speed at the expense of. Burst signals are mixed with binary phase shift keying (BPSK), cyclic shift keying (CSK) and multi-ary frequency shift keying (MFSK) spread spectrum modulation using self-synchronizing and time-frequency two-dimensional search algorithm symbol And carrier synchronization. Through the simulation analysis of the concealed performance of the burst communication system and error performance under multi-channel, and through the South China Sea test shows the performance of the algorithm, in the 5 km communication distance, 4 kHz bandwidth, single pulse signal Communication rate can reach 317 bps, bit error rate of 10 ~ (-3) or less.