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浅海水声信道的结构特征及其变化特性是浅海环境水下远程探测和通讯应用的基础.为了有效测量低频水声信道特性,我们在实验中采用了拖曳等离子体声源和垂直阵接收系统。通过实验测量与信道模型仿真输出的比较,对等离子体声源特性,特别是脉冲波形、空间指向性和电声转换效率,以及在信道中的传播特性等进行测量分析。结果表明:实验测量与信道模型仿真符合良好,实验中采用的等离子体声源的发射源级和拖曳姿态稳定,波形一致性好,可以满足走航式连续水下信道测量要求。
The structural characteristics of shallow water acoustic channel and its variation characteristics are the basis of underwater remote exploration and communication application in shallow sea environment.In order to effectively measure the low frequency underwater acoustic channel characteristics, we used the towed plasma sound source and vertical array reception system in the experiment. Through the comparison between the experimental measurement and the channel model simulation output, the characteristics of the plasma source, especially the pulse waveform, spatial directivity and electroacoustic conversion efficiency, as well as the propagation characteristics in the channel were measured and analyzed. The experimental results show that the experimental measurement is in good agreement with the channel model, and the emission sources and towing attitude of the plasma source used in the experiment are stable. The consistency of the waveform is good, which can meet the requirements of continuous underwater channel measurement.