Research on algorithm of the acousto-optic communication from water to air
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摘要: 为实现水-空跨介质上行无线通信, 文中在激光干涉检测水下声信号的基础上, 通过仿真计算获得了不同水深下声信号到水平面的衰减曲线, 以及不同水声功率频率信号引起的水面微振动曲线。建立了水下声源特征与水表面扰动之间的定量关系。设计了跨介质通信的码元, 并对多种解调方式进行了比较, 分析了各个参数变化对传输过程误码率的影响, 实现了声学-激光通信的调制与解调仿真。Abstract: To achieve underwater-to-air wireless communication across different media, this study utilizes laser interference for detecting underwater acoustic signals. Through simulation calculations, attenuation curves of acoustic signals at various water depths to the water surface, as well as micro-vibration curves on the water surface caused by different underwater acoustic power frequency signals, are obtained. A quantitative relationship between underwater sound source characteristics and disturbances on the water surface is established. Communication code elements for cross-media communication are designed, and various demodulation methods are compared. The analysis investigates the impact of parameter variations on the transmission error rate and accomplishes modulation and demodulation simulations of acoustic-laser communication. The findings guide parameter selection for practical cross-media communication experiments.
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表 1 仿真参数
Table 1. Simulation parameters
参数 数值 激光波长/nm 632.8 系统增益 1 环境干扰幅值/nm 1 000 环境干扰频率/Hz 3 水声信号振幅/nm 30 水声信号频率/Hz 600 高频载波振幅/nm 60 高频载波频率/Hz 10 000 调制度 1.2 表 2 不同调制方式结果
Table 2. Results of different modulation methods
调制方式 载波频
率/Hz最小采
样点最大速度/
(bit/s)10−3误码率
所需信噪比2ASK 600 200 100 6.2 2FSK 600/1 000 300 67 22.0 4FSK 500/900/1 500/2 000 500 80 22.0 2PSK 600 80 250 22.0 -
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