echo signals

transformation and detection of acoustic echo signals with swt-type sodar probing system in the atmospheric boundary layer

SWT声雷达探测系统对大气边界层声回波信号的变换与检测

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The paper presents a method of lake bottom sediment classification using echo signals provided by a wideband active sonar.

本文论述如何运用实际宽带主动声呐的回波信号识别湖底沉积物介质类型。

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The target properties of low altitude radio fuze are discussed at length. The interaction between electromagnetic waves and ground is analyzed. The definition of back scattering coefficient and its influence on echo signals are discussed.

分析了电磁波与地物之间的相互作用，以及目标散射特性对引信回波信号的影响。

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the surface of display sweep coil contaminated by dust. the echo signals in some sectors missing on the screen.

由于显示器扫描线图表面不清洁，荧屏上回波信号部分区域丢失。

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Target echo signals are the main information source in underwater acoustic detection system.

目标回波信号是水声探测系统主要的信息来源。

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To enhance the signal to noise ratio ( SNR) of fundamental ultrasonic echo signals for ultrasonic nondestructive testing ( UNDT) and ultrasonic nondestructive evaluation ( UNDE), an improved technique to suppress structural noises of ultrasonic signals was presented.

为了提高超声无损检测（UNDT）与无损评价（UNDE）基础数据的信噪比（SNR），提出了一种基于神经网络模式识别理论的小波域超声信号消噪技术。

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Finally, the results of the simulated target echo signals passing through a compressed filter are analyzed.

最后分析了模拟目标回波经脉压滤波器的处理结果。

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The WDA ( acronym of Wavelet, Detail and Approximate) cross-correlation method based on wavelet transform was developed in consideration of measuring ultrasound echo signals to reduce the effects of noise, template window sizes and flaws on the time delay estimate using cross-correlation methods.

为了消除噪声、模板窗口大小和缺陷特征等因素对相关法时间延迟估计的影响，结合检测超声回波信号的特点，提出了基于小波变换的相关法时间延迟估计方法。

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The complex scene is simulated, based on the non-correlation of multi-kinds of radar echo signals.

利用各种雷达回波信号之间的不相关性, 实现了复杂场景的数字仿真.

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The research technique route and tenet is to pick-up characteristic parameters by analyzing relevant ultrasonic echo signals and then found the relation between the structure configuration and evolvement process, till realize UNDE and UNDT of materials finally.

本研究的基本技术路线和宗旨是通过对超声回波信号进行相应的分析，提取模型的特征参数，并与材料的组织形态及其演变过程相关联，最终实现材料的超声无损表征与评价。

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