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| 1 | Signal processing in underwater acoustic communication system for manned deep submersible 'Jiaolong'显示文摘For the first time in the world,underwater acoustic transmission of images,human voice,data and texts between vehicle under 7000 m depth and surface ship was accomplished by underwater acoustic communication system of manned deep submersible 'Jiaolong'.In this paper,signal processing in underwater acoustic communication system for manned deep submersible 'Jiaolong' is introduced.(1) Four communication methods are integrated to meet different needs:1) coherent underwater acoustic communication,with a variable transmission rate from 5 kbps to 15 kbps,to transmit images.2) Non-coherent underwater acoustic communication, with a transmission rate 300 bps,to transmit texts,instructions,and sensor data. 3) Spread spectrum underwater acoustic communication,with a transmission rate 16 bps,to transmit instructions.4) Underwater voice communication,using single sideband modulation to transmit human voice.(2) Signal processing method in coherent communication mainly consists of concatenation of decision feedback equalizer and Turbo decoder,and wavelet based image compression with fixed length coding.In the equalizer,Doppler compensation,multichannel combining and equalizer coefficients updating are all using fast self-optimized adaptive algorithm.(3) A linear hydrophone array is lowered from the mother ship to certain depth, and spatial diversity combining technology is adopted.(4) Diving trials of 'Jiaolong' were carried out in Pacific Ocean.The communication range can cover nearly all ocean depth.One optical/acoustic image can be transmitted in 7 or 14 seconds. | ZHU Weiqing ZHU Min WU Yanbo YANG Bo XU Lijun FU Xiang PAN Feng | 2013 | Chinese Journal of Acoustics2013，32，1： | 7 |
| 2 | 相干水声通信幅相加权空间分集均衡算法显示文摘水声信道的典型特点为多普勒频移严重、可利用带宽窄以及强多径干扰。空间分集均衡技术是相干水声通信中克服信道多径干扰,消除码间干扰的一种有效手段。为了极大化地输出阵增益,结合无源相位共轭方法和多通道均衡算法,本文设计了组合信噪干比的全新信道评价方法。利用改进的Sigmoid函数对各通道接收信号的幅度进行加权处理;采用二阶锁相环跟踪各通道信号的相位变化,实现各通道信号同相累加。将各通道低通滤波后的信号能量归一化,采用了分数阶-判决反馈分集均衡器,加入各通道权重系数实现了水声通信系统的分集均衡接收。仿真结果和湖试数据处理结果均表明,优化的幅相加权分集均衡接收算法能抵消多径和噪声的干扰,性能优于等增益合并接收算法。湖试数据处理结果误码率降低了1.8%。 | 李记龙 黄敏燕 程淑萍 谭倩琳 冯海泓 | 2017 | 声学学报2017，42，6： | 3 |
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