1) supersonic communication
超声通信
2) supersonic communication,ultrasonic communication
超声波通信
3) Ultrasonic signal
超声信号
1.
Adaptive wavelet thresholding based ultrasonic signal denoising;
基于自适应小波阈值的超声信号消噪
2.
Digital quadrature demodulator for detecting ultrasonic signal based on FPGA;
基于FPGA的超声信号数字正交解调器
3.
The ultrasonic defect echo of a austenite stainless steel with coarse grainswas acqiuired and processed using a developed computerized ultrasonic signal analysissystem.
采用计算机化超声信号分析系统,对奥氏体不锈钢粗晶材料缺陷的超声回波信号进行采集和加工。
4) ultrasonic fuze
超声引信
1.
On-land simulation of torpedo active ultrasonic fuze is an important part of torpedo on-land simulation.
鱼雷主动超声引信陆上仿真是全雷陆上仿真的重要组成部分。
2.
To remove the noise signal effectively in processing torpedo ultrasonic fuze signal,wavelet theory and artificial neural network are introduced simultaneously,and the construction method of self-adaptive wavelet neural network is given.
将小波理论和人工神经网络技术同时引入鱼雷超声引信目标信号处理中,抑制信号噪声,并给出了自适应小波神经网络的构造方法。
5) underwater acoustic communication
水声通信
1.
Research on phase compensation in OFDM underwater acoustic communication systems;
OFDM水声通信系统中一种相位补偿方法
2.
The application of TD-MFM in underwater acoustic communication;
时频编码在水声通信中的应用
3.
M-ary chaotic spread spectrum Pattern time delay shift coding scheme for multichannel underwater acoustic communication;
M元混沌扩频多通道Pattern时延差编码水声通信
6) UWA communication
水声通信
1.
UWA communications suffer from interferences due to multi-path,ambient noise and Doppler shift.
水声信道是一个极其复杂的时变-空变-频变信道,因而进行水声通信,必须克服时变多途干扰等困难。
2.
However,serious multipath fading and Doppler frequency shift lead to high bit-error-rate of UWA communication.
对于水声通信中严重的多途衰落和多普勒频移现象,采用多径分离再合并技术和实时频率跟踪技术有效地解决了以上问题,大大降低了系统的误码率。
3.
Narrow channel band,severe multipath interferences and severe channel attenuation have demonstrated the great complexities and difficulties of high-speed UWA communications.
信道通带窄、多途干扰强、衰落严重是水声通信高速可靠传输信息的主要障碍。
补充资料:超声
超声
UltrasofliCS
是指超出人耳听力范围的高频声(频率超过20000Hz)。超声具有与一般声音共同的物理性质,还具有一些其他重要的物理特性,如能够成束发射,直线传导,方向性好。传导过程中遇有声阻抗不同的反射界面时产生反射、折射、聚焦和散焦等现象。用于临床诊断的超声频率一般为2~7.5MHz。频率越高,对组织结构的分辨力越强,但远场声能容易被组织吸收、衰减,不易穿透较深的层次。
说明:补充资料仅用于学习参考,请勿用于其它任何用途。
参考词条