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>The comprehensive evaluation of performance and environmental influence on MPSK modulated high-speed acoustic communications in shallow water.
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The comprehensive evaluation of performance and environmental influence on MPSK modulated high-speed acoustic communications in shallow water.
A daily study spanning a month of the shallow water acoustic channel was conducted to estimate the environmental influence on performance of an underwater acoustic communications system. An automated acoustic modem transmitted phase-coherent modulated sequences of identical data with 186 dB re 1muPa source level, at coded rates from 4000 to 16000 bits/s with 4 or 8 kHz symbol bandwidth, three times daily for a month. A 64 channel Mills-Cross receiver array was used with horizontal and vertical beams each containing 32 and 33 elements respectively, spaced 0.03 meters apart, with a sampling frequency of 72 kHz. Source and receiver were deployed at depths of 20 meters respectively, with a 720 meter separation range. Environmental measurements of wind velocity and direction, surface wave activity, current and sound velocity profiles, and tidal measurements were performed. Results demonstrate reliable achievement of high data-rate shallow water acoustic communications using phase-coherent modulation techniques.
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机译:进行了一个月的浅水声通道每日研究,以估计环境对水下声通信系统性能的影响。一个自动的声学调制解调器以4000到16000比特/秒的编码速率,以4或8 kHz符号带宽,以186 dB re 1muPa的源电平传输相同数据的相位相干调制序列,每天一次,共三个月。使用64通道的Mills-Cross接收器阵列,水平和垂直波束分别包含32个和33个元素,彼此间隔0.03米,采样频率为72 kHz。源和接收器分别部署在20米深处,分隔范围为720米。进行了风速和风向,表面波活动,电流和声速剖面以及潮汐测量的环境测量。结果表明,使用相干相干调制技术可以可靠地实现高数据速率浅水声通信。
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