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水下甚低频目标的深度分类及布放预报

期刊名称：华中科技大学学报
时间：2015
页码：71-75
分类：TB567[交通运输工程—水声工程;理学—物理;理学—声学]
作者机构：[1]哈尔滨工程大学水声技术重点试验室,黑龙江哈尔滨150001, [2]哈尔滨工程大学水声工程学院,黑龙江哈尔滨150001
相关基金：国家自然科学基金资助项目（51179034;61471137）;船舶预研支撑技术基金资助项目（13J3.1.5）
相关项目：基于单矢量有源平均声强器和时间反转镜的水声空分多址技术研究

关键词：移动水声通信, 时延-多普勒函数, 犿序列, 多通道判决反馈均衡器, mobile UWA communication, delay-Doppler function, m sequence, multi-channel DFE（decision feedback equalizer）

中文摘要：

针对收发节点之间的相对运动使得信号压缩或者展宽、载波频率偏移,导致通信误码率较高的问题,提出基于犿序列的水声信道时延-多普勒函数估计方法.在大连市小长山岛附近水域进行了移动水声通信试验,试验过程中发射船以2.5m·s-1的恒定速度先靠近接收船而后远离.由于发射船相对于接收船方位时刻发生变化导致时变的多普勒效应.利用信号帧首部的犿序列测得接收数据分别存在-15,-5和17Hz的频率偏移,对接收数据进行重采样处理后采用多通道判决反馈均衡器抑制码间干扰以及残留的多普勒效应引起的相位变化,均衡后输出信噪比达到15.11,14.64和15.14dB.试验结果表明：该方法实现了时变水声信道的有效跟踪和补偿,大大提高了解码性能.

英文摘要：

In order to decrease communication bit error rate（BER）caused by relative motion between a source and receiver which can make the signal compression or dilation in time domain and carrier frequency offset in frequency domain,mobile underwater acoustic（UWA）communication was studied and a delay-Doppler function estimation method based on msequence was proposed.A mobile UWA communication experiment was conducted near Xiaochangshan Island,Dalian in July,2015.The source first moved to the receiver and then went away with a constant speed 2.5m/s during this experiment.The changing bearing of source relative to receiver leads to a time-varying Doppler effect.Frequency offsets of-15,-5and 17 Hz were measured using msequence at the beginning of the signal frame.Multi-channel decision feedback equalizer（DFE）was adopted to suppress inter symbol interference（ISI）and phase variation caused by residual Doppler effect after resampling received data.The output signal-to-noise ratio（SNR）after equalizing is 15.11,14.64 and 15.14 dB respectively.Experimental results show that this method realizes effective tracking and compensation of time-varying UWA channel and improves communication performance greatly.

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