王升,马力,吴金荣.浅海波导远程信混比预报模型[J].声学技术,2012,(6):550~554 |
浅海波导远程信混比预报模型 |
Prediction model of echo-to-reverberation ratio in shallow water waveguide |
投稿时间:2011-11-28 修订日期:2012-02-03 |
DOI:10.3969/j.issn1000-3630.2012.06.003 |
中文关键词: 简正波 混响 目标回波 信混比 海底参数 |
英文关键词: normal-mode wave reverberation target echo echo-to-reverberation ratio seafloor parameter |
基金项目:国家自然科学基金项目(10874201)、(11074271) |
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中文摘要: |
浅海主动探测时,海底混响是目标回波的主要背景干扰,信混比影响主动声纳的性能.混响和目标回波都属于海洋中的散射问题,利用简正波方法,结合平面波散射函数建立了浅海远程信混比预报模型,实现了不同环境参数下信混比的量化分析.仿真比较了不同信号形式、频率以及不同海底底质下的刚性球信混比曲线,从理论上分析了回波随距离的振荡现象.结果表明:用无指向性的声源探测目标时,信混比较低,探测较为困难;宽带信号照射下目标回波更加平稳;简正波之间的干涉导致回波随距离发生振荡,频率越高,干涉结构越复杂;在硬海底环境中信混比相对较小且目标回波振荡剧烈. |
英文摘要: |
For active detection in shallow water, seafloor reverberation has great influence on target detection, so echo-to- reverberation ratio determines the performance of active sonar. Both reverberation and target echo are scattering problems in ocean. In the paper, long-distance echo-to-reverberation ratio prediction model in shallow water has been built by associating normal-mode theory with plane-wave scattering function. The advantage of this model is that it enables making quantitative predictions of echo-to-reverberation ratio. The model has been applied to rigid sphere submerged in homogeneous water with various signals, frequencies and seafloor conditions. Results show: it is difficult to detect target by using omnidirectional source because of low echo-to-reverberation ratio; broadband signal makes echo smooth relatively; echo fluctuation phenomenon is found and analyzed theoretically as a result of interference among modes especially at high frequency; echo-to-reverberation ratio is low relatively and fluctuates obviously for hard seafloor. |
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