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本文中研究一种水下目标识别方法并介绍一组材料、大小、厚度不同的中空圆柱形水下目标的识别实验。我们分三步提取水下目标特征量。第一步是在频域上用短脉冲作为入射信号辨识脉冲响应函数。第二步用“卷积-修正递推最小二乘”法估计目标ARMA模型参数。第三步计算频域上的极点。我们用极点作为水下目标的特征量,并认为它是一个不变量。计算机模拟结果表明,同以AR参数作为特征量的方法相比较,极点法的抗噪声干扰能力改善12dB。我们采用匹配滤波分类器对水下目标进行分类。实验结果表明,在无噪声情况下,正确识别率可达100%。信噪比
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ACOUSTIC INVERSE METHOD FOR MEASURING THE SIZE-DISTRIBUTION OF THE DROPS AND THE MOISTURE CONTENT IN WATER (CLOUD) FOG 下载免费PDF全文
The acoustic-energy loss was measured when the sound wave propagated through a layer of water fog. By the application of the sound attenuation theory in granular media and by means of the acoustic inverse (optimization) method, the size-distribution of the drops and the moisture content in the water fog were measured. It is demonstrated that the sizes of the water drops obey the normal distribution approximately. Comparison of the size-distribution results between data obtained by the inverse measurements and those obtained by the optic-microscopic-size methods shows good agreement with each other. The results of the moisture content and the thickness of the fog layers obtained by this method are also consistent with the results measured by other methods (for example, the water-content weight and the direct measurement of layer's thickness by a scale, etc.) reasonably. 相似文献
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全国人民十分关注的全国科学大会,就要在北京召开了.这是我国建国以来的创举;这是我们科学技术战线的盛大节日.我们热烈地、衷心地欢呼这次大会的隆重召开. 面对着科技界空前灿烂的满园春色,我们深切怀念伟大领袖和导师毛主席、敬爱的周总理和朱委员长.中国人民有今天,是在毛主席为首的中国共产党的领导下,进行长期的、艰苦卓绝的伟大斗争取得的.没有毛主席,没有共产党,就没有新中国.科学技术革命是无产阶级专政下继续革命的一个重要内容.毛主席曾经指出:“要在继续完成政治战线上和思想战线上的社会主义革命的同时,把党的工作的着重点放到… 相似文献
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