Underwater acoustic communication; Pattern Time Delay Shift Coding system; single-element Virtual Time Reversal Mirror; DSP; TMS320DM6446
国家自然科学；水声通信； Pattern时延差编码体制；单阵元虚拟式时间反转镜； DSP； TMS320DM6446
The application of the TRM to the UWA communication could eliminate or mitigate the inter-symbol interference caused by acoustic channel's multipath and delay spread.
单阵元PTRM既克服了主动式时反镜信号双向传输、效率低下且要求阵元收发合置的弊端，又克服了基阵处理对水下通信节点不适用的障碍。
The algorithm of the virtual time reversal mirror was proposed and applied to the underwater acoustic communication based on the Pattern time delay shift coding scheme.
提出虚拟时间反转镜算法，并基于Pattern时延差编码水声通信体制，研究了VTRM在水声通信中的应用。
Leaky surface acoustic wave; Biosensor; Delay line; Phase
漏声表面波；传感器；延迟线；相位
The application of time delay estimation in passive acoustic detection and location was studied.
研究了时延估计算法在被动声测定位中的应用，提出了一种改进的基于最大似然权函数的广义互相关时延估计算法。
However, the throughput performance of underwater acoustic communication networks is greatly restricted by the characteristic of half-duplex and long round trip delay for underwater acoustic channels.
但是，在水声通信网络中，由于水声信道的半双工以及信道的长传播时延特性，使得水声通信网络的吞吐性能受到极大的制约。
According to principle of airborne radar calibration, three kinds of static active calibration methods for airborne radar are compared; and characteristics of airborne radar calibration system based on bulk-acoustic wave delay line are analyzed.
根据机载雷达校准原理，比较三种地面静态有源校准方法，分析基于声体波延迟线的机载雷达校准系统的特点，并且通过工程应用验证其实用性。
Wave Transform technology is more fit for estimating the acoustic signal`s time delay in the strong noise environment.
基于互相关函数的信号时延估计方法，又可以简称为相关时延估计法。
It is firstly presented that PA phase includes two components: one is the time delay that occurs during the process in which light absorbed by sample converts into heat; the other is the time delay caused from heat to acoustic signal.
一、首次提出光声位相来自两部分：一部分为物质吸收光后无辐射跃迁产生热引起的位相；另一部分为周期性热在扩散至固气界面导致气体压力的变化，从而使微音器检测到声信号这一过程引起的位相。
In order to acquire the accurate transmitted time of sound wave in power plant furnace in acoustic pyrometry, the time delay estimation of weak sound signal under the condition of strong noise is studied.
为了在电站锅炉声学测温中获得准确的声波飞渡时间，针对强噪声环境下弱信号检测问题，研究了声信号的时间延迟估计。
The surface-acoustic-wave devices, time delay window and coincidence detection gate provide the capability for fast synchronization. The precision of fast synchronization is ±0.5 chip.
采用声表面波器件，时间延时门和一致检测窗能十分满意地解决同步的快速捕获，精度达正负半个码元。
Circulating surface acoustic wave delay line
环绕式表面声波延迟线
This article outlines the principle of operation, performance parameters and time domain characteristic of a microwave bulk acoustic wave delay line (MBAWDL).
本文简述了微波体声波延迟线的工作原理、参数和时域特性。
Vapor Sensors Based on Surface Acoustic Wave Delay Line Oscillators
声表面波延迟线振荡器为核心的气体传感器
Study on the Design and Technique of a GaAs Acoustic Charge Transport Delay Line
砷化镓声电荷转移延迟线的设计与工艺研究
As oscillating frequency of acoustic surface wave delay line oscillator is influenced by temperature, output frequency of the sensor is not only determined by deposited mass, but also determined by temperature.
由于环境温度对SAW延迟线振荡器的振荡频率影响较大，传感器的输出不仅决定于质量沉积区所沉积的质量，还决定于测量时所处的环境温度。
Acoustic Charge Transport Delay Line
声电荷输运延迟线
The successful development of a high power reflective BAW (Bulk Acoustic Wave) microwave delay line with a one-port network is repo-rted utilizing the configuration of a one-dimensionally longitudinal Au// Cr/ZnO/Au/Cr/Z-Al2O3 thin film transducer.
本报告介绍了采用Au/Cr/ZnO/Au/Cr/Z-Al2Oq一维纵向薄膜换能器结构，研制成大功率反射式体声波单端口网络的微波延迟线。
The shape and size of transducers, array geometry and excitation delay of source array and the shifting time of acoustic signals received by receiver array affect the efficiency of acoustic beam steering in acoustic logging.
在声波测井中声束导向的效率除受换能器的几何参数及阵列声波发射单元的激励延迟时间或阵列接收器接收的各道声波信号偏移时间的影响外，还受换能器的形状和尺寸的影响。
Based on principals of interference of acoustic waves and simplified digital delay-line, comb filter effect induced by superposition of reflections from steps is presented.
从声波干涉的基本原理出发，通过数字延时线的简化分析，说明了多级台阶反射声的叠加对声波频率产生的梳状滤波效果。