Local-linear-prediction analysis for underwater acoustic target radiated noise

This is caused by the complexity of underwater target radiated noise and the variety condition of the sea.

这是由于水下目标辐射信号和海洋环境的复杂性、多变性造成的。

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Local-linear-prediction in phase space is performed for the underwater acoustic target radiated noise.

从动力学的观点，对水声目标辐射噪声进行相空间的局部线性预测。

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Firstly, the constraint conditions of static candidate target and noise candidate target enhance the anti-jamming ability.

在目标确认过程中增加了静止候选点约束和噪声候选点约束条件，增强了抗干扰性。

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EM-based Underwater Target Radiated Noise Model Parameters Estimation

基于EM算法的水下目标辐射噪声模型参数估计

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The statistic distribution expressions of target and noise in2-dimensions domain were established.

推导出了目标和噪声在二维投影空间中的分布公式。

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And underwater target radiated noise is a great sort of underwater acoustic signal.

而水中目标辐射噪声是水声信号中的一大类。

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The Research on Localization Method using the Information of Frequency Domain of a Target Radiated Noise

利用目标噪声频域信息的定位方法研究

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Computing Embedding Parameter of Target Radiation Noise from the Joint Forecast Effect

联合预测效果确定噪声信号嵌入参数的方法

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A Method for Modulation Feature Extraction of Underwater Target Radiated Noise

一种水下目标辐射噪声调制特征提取方法

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Study on underwater target radiated noise modulated information extraction method

水中目标辐射噪声调制信息提取方法研究

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Nonlinear noise reduction of the underwater target radiated noise time series

水下目标辐射噪声时间序列的非线性降噪处理

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Characteristic Extraction Method for Underwater Target Radiated Noise Based on Wavelet Transform

基于子波变换的水下目标辐射噪声特征提取方法

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DEMON analysis of underwater target radiation noise based on modern signal processing

基于现代信号处理技术的舰船噪声信号DEMON分析

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A new detection method for low speed and small target over noise background

噪声背景下雷达低速小目标检测的一种新方法

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In this paper, on the basis of deeply analyzing the spectrum feature of the target noise, a large quantity data of two sorts of target noise are simulated under the condition of different frequency, departure, depth and SNR.

本文还在深入分析了目标声场谱特征的基础上，分别建立了两类目标在不同频段、不同横距、不同深度及不同信噪比下的大量仿真数据。

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Therefore by earnestly studying in the wavelet analysis method, in view of the airborne target noise signal, the article adopts the wavelet soft threshold value to eliminate noises, obtains the satisfying effect.

因此本文在认真研究了小波分析方法的基础上，针对空中目标噪声信号，采取小波软阈值去噪方法，取得令人满意的效果。

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According to the property of broadband target noise, the thesis presents a method of DOA estimation for uniform round sonar arrays and introduces joint interpolation-filter-delay-extract method.

针对目标辐射噪声的宽带特性，研究了基于均匀圆形声纳基阵的信号入射方位估计算法，并采用级联的插值-滤波-延时-抽取方法实现了该算法。

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The system of passive ranging SONAR makes use of the target noise received by the equipment which converts energy from one form to another to estimate the target distance.

被动测距声纳系统是利用换能器基阵接收的目标辐射（噪声）信号来估计目标距离。

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Based on these analyses, simulations on SAR point target noise jamming are made. The results show that the two models are effective.

最后，通过建立的干扰噪声模型对点目标进行了干扰验证，验证两种干扰噪声模型干扰的有效性。

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The mechanism of the produce of target noise, its transmission characteristics in air and several main factors that influence the sound transmission are analyzed.

分析了低空目标声源的产生机理、目标辐射噪声在大气中的传播特性以及影响其传播的几个主要因素。

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