文章摘要
杨振,袁志勇.信道多途对定位系统时延估计的影响及抑制[J].声学技术,2008,(6):907~911
信道多途对定位系统时延估计的影响及抑制
Analysis of multi-path channel effect on time-delay estimation in positioning system
投稿时间:2008-01-16  修订日期:2008-04-30
DOI:
中文关键词: 水下声信道  抗多途  多途信号  信号检测  时延估计
英文关键词: underwater sound channel  anti-multipath  multipath signal  signal detection  time-delay estimation
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作者单位E-mail
杨振   
袁志勇  lyp78225@sina.com 
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中文摘要:
      基于水下声信道的特性,分析了界面反射对信号检测和时延估计的影响,论证了直达声和海面一次反射声时延差的变化规律。根据两信号叠加的特点,对常规的信号处理方法进行了改进。经仿真验证,改进的方法可提高"边沿"信号的检测能力,避免时延估计值的"跳变"现象,有效减小多途影响。
英文摘要:
      Based on the property of underwater acoustic channel,the effect of interface reflection on signal detection and time-delay estimation is analyzed,and the changing rule of the phase difference between direct sound and surface reflected sound is demonstrated.According to the character of two signals addition,the normal signal processing logic is improved.The simulation result shows that this improved logic can advance the detection ability to edge signal,avoid the jump of time-delay estimation and eliminate multi-path influence efficiently.
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