【作者】 王升； 马力； 高守勇； 吴金荣；

【Author】 WANG Sheng~1,MA Li~1,GAO Shouyong~(1,2),WUjinrong~1 (1.Key Laboratory of Underwater Acoustic Environment,Institute of Acoustics,Chinese Academy of Sciences,Beijing 100190,China; 2.Unit 91388,PLA,Zhanjiang 524022,Guangdong,China)

【机构】 中国科学院水声环境特性重点实验室； 91388部队95分队；

【摘要】 浅海环境中,不同海区海底参数差别较大,这将对主动声纳探测目标产生影响。本文在简正波混响模型和目标散射模型基础上建立了浅海信混比预报模型,实现了信混比的量化分析。仿真比较了沙石海底和淤泥海底两种情况下,源信号脉宽分别为1s和0.05s时的刚性球信混比曲线。结果表明:浅海信混比有较强的参数依赖性;在硬海底环境中信混比相对较小且目标回波振荡剧烈;通过减小源信号脉宽,可以有效提高信混比,弱化目标回波中各阶简正波之间的干涉。更多还原

【Abstract】 In shallow water,seafloor parameters vary significantly with geographical position,it has great influence on target detection.In the paper,echo-to-reverberation ratio prediction model in shallow water has been built based on normal mode reverberation model and object scattering model.The advantage of this model is that it enables quantitative predictions to be made of the echo-to-reverberation ratio in shallow water waveguide.For example,the model has been applied to rigid sphere submerged in homogeneous water and echo-to-reverberation ratio curves are calculated for source duration Is and 0.05s in sand seafloor and silt seafloor conditions respectively.Results show that seafloor parameters are of significance to echo-to-reverberation ratio,echo-to-reverberation ratio is low relatively and oscillates obviously with range in hard seafloor. By reducing source duration,echo-to-reverberation ratio is enhanced and echo modes interference is suppressed effectively.更多还原