CAJ | 학술논문

以海底混响作为研究对象,推导出统一形式的混响信号模型.为了克服该模型因计算每一个散射体作用结果而带来的计算复杂性,又提出了混响信号统计模型,然而统计模型的数值运算强度仍然可观.进一步应用简正波方法导出窄带混响信号模型,输入信号的窄带条件简化了关于频率的数值积分运算.对于窄带信号模型的分析表明:在输入高频窄带信号情况下,混响信号能够近似建模为输入信号与随机序列的离散卷积;混响信号的统计特性随散射体的分布情况变化而发生改变.最后,针对窄带混响信号模型设计了一种基于等间隔散射单元划分结构的仿真方法,仿真结果显示了方法的有效性.
이해저혼향작위연구대상,추도출통일형식적혼향신호모형.위료극복해모형인계산매일개산사체작용결과이대래적계산복잡성,우제출료혼향신호통계모형,연이통계모형적수치운산강도잉연가관.진일보응용간정파방법도출착대혼향신호모형,수입신호적착대조건간화료관우빈솔적수치적분운산.대우착대신호모형적분석표명:재수입고빈착대신호정황하,혼향신호능구근사건모위수입신호여수궤서렬적리산권적;혼향신호적통계특성수산사체적분포정황변화이발생개변.최후,침대착대혼향신호모형설계료일충기우등간격산사단원화분결구적방진방법,방진결과현시료방법적유효성.
Taking the seafloor reverberation as a studied object, an uniform model for calculating reverberation was deduced. In order to overcome the calculation complexity caused by calculating each of scatterers, a statistic model for reverberation was presented, which numerical calculation intensity is still considerable. A normal-mode model for calculating the reverberation excitated by the narrowband signal was got, in the narrowband approximation, numerical calculation of frequency became easy. The analyses of normal-mode model show that the reverberation excited by narrowband and high frequency signal can be expressed as a discrete convolution of the input signal and a group of random sequence approximately;statistic characteristics of the reverberation signal vary with distribution of the scatters. A simulation method was designed, in which the scatter cell was divided by equal interval rule in range.The simulated results show effectiveness of the method.