| 摘要: |
| 采用椭球体近似模型对大黄鱼(Pseudosciaena crocea)、小黄鱼(P. polyactis)和银鲳(Pampus argenteus)的声散射特征进行了理论计算和研究。其中鱼鳔为充满气体的椭球体模型, 鱼体为充满液体的椭球体模型。利用研制的散射角度可调的目标强度测量装置, 对几种鱼种进行了目标强度随倾角变化关系研究。通过理论分析和实验对比, 采用数据拟合的方法建立了3 种鱼类目标强度随倾角变化的经验公式。研究表明, 角度分布是影响目标强度的重要参数, 目标强度最大值和最小值相差大于15dB, 其最大值出现在-10°和10°之间, 最小值出现在-40°以后。修正后的椭球体模型可以较好地反映目标强度的指向性, 可以作为现场测定的重要补充。 |
| 关键词: 大黄鱼 小黄鱼 银鲳 声散射 椭球体模型 目标强度 |
| DOI：10.11693/hyhz20141200362 |
| 分类号: |
| 基金项目:海岛生态系统监测及保护关键技术研究与示范, 2012BAB16B02 号。 |
附件 |
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| ON TARGET STRENGTH OF SEVERAL IMPORTANT ECONOMIC FISHES |
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SHANG Xiao-Ming, KONG Ling-Min, WU Chang-Wen
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Marine Science and Tecknology College of Zhejiang Ocean University, National Engineering Research Center of Marine Facilities Aquaculture, Zhoushan 316022, China
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| Abstract: |
| We studied the scattering property of yellow croaker Pseudosciaena crocea, redlip croaker P. polyactis, and pomfret Pampus argenteus, based on approximately ellipsoid model. Where the swim-bladder model is modeled by gas-filled ellipsoid model, and the fish body is modeled by liquid-filled ellipsoid model. We constructed an equipment of measuring target strength with changing the tilt-angle of fish and studied the target strength of yellow croaker, redlip croaker and pomfret with this equipment. Compared the theoretical results with experimental results, we construct three empirical formulas of target strength changing with angle, using data fliting method. The research shows that the angular distribution is an important parameter of effecting target strength, the difference between maximum and minimum value of target strength assumed to be greater than 15dB, the maximum value appears at -10° to 10°, while the minimum appears below -40°. The flited ellipsoid model could be a better response to directivity of target strength, so it could be an important supplement in in-situ measurements. |
| Key words: yellow croaker Pseudosciaena crocea redlip croaker P. polyactis pomfret Pampus argenteus backscattering ellipsoid model target strength |
