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基于波形形态特征的海洋赤潮识别方法
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作者 赵文仓 《高技术通讯》 CAS CSCD 北大核心 2007年第4期406-411,共6页
通过对航空遥感高光谱波形的产生机理和形态特征的分析,提出了一组描述海水赤潮吸收和反射峰的特征参数及其计算方法,根据提取出的特征参数提出了两种海洋赤潮监测和识别的方法。通过对赤潮暴发现场采集的高光谱数据的分析证明,该方法... 通过对航空遥感高光谱波形的产生机理和形态特征的分析,提出了一组描述海水赤潮吸收和反射峰的特征参数及其计算方法,根据提取出的特征参数提出了两种海洋赤潮监测和识别的方法。通过对赤潮暴发现场采集的高光谱数据的分析证明,该方法可以有效地提取出数据中赤潮吸收峰和反射峰的特征参数,并且可以识别出赤潮发生的区域。所提出的方法为海洋赤潮的预测、引发赤潮的优势种藻类的判断以及藻类浓度的定量分析奠定了基础。 展开更多
关键词 赤潮识别 波形形态特征 吸收峰 反射峰 高光谱数据
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Blind Source Separation based on Time-Frequency Morphological Characteristics for Rigid Acoustic Scattering by Underwater Objects 被引量:1
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作者 Yang Yang Xiukun Li 《Journal of Marine Science and Application》 CSCD 2016年第2期201-207,共7页
Separation of the components of rigid acoustic scattering by underwater objects is essential in obtaining the structural characteristics of such objects. To overcome the problem of rigid structures appearing to have t... Separation of the components of rigid acoustic scattering by underwater objects is essential in obtaining the structural characteristics of such objects. To overcome the problem of rigid structures appearing to have the same spectral structure in the time domain, time-frequency Blind Source Separation (BSS) can be used in combination with image morphology to separate the rigid scattering components of different objects. Based on a highlight model, the separation of the rigid scattering structure of objects with time-frequency distribution is deduced. Using a morphological filter, different characteristics in a Wigner-Ville Distribution (WVD) observed for single auto term and cross terms can be simplified to remove any cross-term interference. By selecting time and frequency points of the auto terms signal, the accuracy of BSS can be improved. A simulation experimental has been used to analyze the feasibility of the new method, with changing the pulse width of the transmitted signal, the relative amplitude and the time delay parameter. And simulation results show that the new method can not only separate rigid scattering components, but can also separate the components when elastic scattering and rigid scattering exist at the same time. Experimental results confirm that the new method can be used in separating the rigid scattering structure of underwater objects. 展开更多
关键词 underwater object highlight structure rigid scattering components image morphology TIME-FREQUENCY blind source separation
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