传播时间

最后本文将遗传算法改进的BP神经网络模型应用于河道水流传播时间的预测，并建立了相应的水流传播时间预测模型。

Moreover , the improved BP neural network with genetic algorithm is employed to predict the propagation time of flow and the corresponding network model are established .

然后从测量的波达时间中减去附加时延，得到对LOS传播时间的估计，进而估计移动台的位置；

And then the excess delay is removed from the measured TOA to estimate the line of sight ( LOS ) propagation time and the position location of the mobile station ( MS );

阵不变量实质为信号在平均声速c条件下从声源-接收器的的绝对传播时间。

The physical meaning of array invariant is the absolute traveling time of the signals from source to receiver under the average sound speed .

四是在测量传播时间时，使用锁相环（PLL）技术来提高系统的测时分辨率；

Forth , with regard to measurement for transmitting time , PLL technology is used to elevate time measurement precision .

基于LZ复杂度的脉搏传播时间变异性分析

Analysis of pulse transit time variability based on LZ complexity

PSV波的传播时间也可用三项泰勒展式表达，在中等及短排列长度时可达到一定精度。

For the P-SV wave travel time , it also can be expressed exactly by a three-term Taylor series in short or moderate spreads .

对PP波、PSV波的传播时间进行三项泰勒展开时，它们的系数中包含了地震波的各向异性信息及垂直速度信息，可以为地震波的弹性参数反演提供基础。

The three term Taylor series of P-P wave or P-SV wave reflection travel times in VTI media are the function of elastic parameters . Therefore they can be used to inverse the seismic elastic parameters .

有了它，就可以非常方便容易地用不同模型计算广阔区域接收多个长波信号在各种典型路径上的ASF和地波传播时间延迟和提高定时精度。

The ASF and the ground propagation delay of long-wave signal from many stations in different typical path for wide area , can be easy computed and improved in timing accuracy with different model by this GIS software .

根据地震波在具有垂直对称轴的横向各向同性（VTI）介质中的运动学特征，应用传播时间反演方法，进行了水平层状VTI介质的地层弹性参数反演方法研究。

In this paper , seismic inversion of elastic parameters in horizontally layered VTI ( transverse isotropy media with vertical symmetry axis ) is well studied , on the basis of seismic wave kinematics theories in transverse isotropic media with vertical symmetry axis .

Fuks和Godin关于随机界面背向散射脉冲传播时间统计特性理论只适应于随机界面和波阵面up-crossing且界面高度-斜率不相关情形。

The theory of Fuks and Godin [ Waves Random Media , 14 , 539-562 ( 2004 ) ] on the travel-time statistics of backscattered short pulses from a random rough surface is only applicable to cases of " up-crossing " and where the surface elevation-slope is uncorrelated .

超声传播时间、幅度及混凝土缺陷检测

Detection of Ultrasonic Transit Time , Amplitude and Flaw in Concrete

漫滩流量减小，传播时间延长。

Bankful discharge is smaller and travel time is longer .

由传播时间反演海水中的声速剖面

Sound speed profile in ocean inverted by using travel time

传播时间法超声流量计信号处理技术进展述评

Review of the Signal Processing Techniques in Transit-Time Ultrasonic Flowmeters

内燃机火焰平均传播时间的测量电路设计

Circuit Design of Measuring Mean Flame Propagation Time in Internal Combustion Engine

用整零分测技术精确检测声传播时间

Precise Measurement of Ultrasonic Transmission Time Using the Integral-oddment Separate Measuring Technology

外夹装传播时间法超声流量计应用准则

Application Criteria of Out - clamped Ultrasonic Flowmeter Measuring by Propagating Time

声学法测温系统及声传播时间测量方法研究

Research of Acoustic Temperature Field Measurement System and Acoustic Travel-time Measurement Method

脉搏传播时间变异性谱分析的预处理方法研究

Preprocessing methods for spectrum analysis of pulse transit time variability

运用灰色关联分析法推求河流流量传播时间

Use of Grey Correlation Analysis Approach to Inquire into Propagation Time of Flow

洪水的传播时间和水位表现受多种因素的制约；

Travel time and water level of flood are affected by various factors ;

左室舒张早期血流传播时间与左室松弛时间常数的相关性分析

A Correlation Study between Left Ventricular Diastolic Flow Spread with Left Ventricular Relaxation Time Constant

基于声传播时间的二维流场反演数值仿真研究

Numerical simulation study on inversion of two dimensional flow field using acoustic ray travel time

高度-斜率相关对随机界面背向散射脉冲传播时间统计特性的影响

Effect of the Elevation-Slope Correlation on Travel-Time Statistics of Backscattered Pulses from a Random Rough Surface

传播时间窗越小，这种实现风格就越接近绝对一致。

The smaller the window of propagation , the more this implementation style moves towards absolute consistency .

河段洪峰传播时间预报的非线性演进与分段积分法

Development of Nonlinear and Integral Method for the Forecast of Travel Time of Peak Flood in River Reaches

前者引起反射波信息随传播时间逐步减弱；

The former is reflection information which has gradually weakened with propagation time caused by attenuation by absorption ;

二是其传播时间不长，人们对之了解不深；

The second is not long time of Esperanto in China and Chinese don 't know it well ;

该算法使用射线追踪计算传播时间，应用波场界面方程计算反射振幅。

This algorithm uses ray tracing to calculate traveltime , and de-rives reflection amplitude from wave field interface equation .

水量传播时间研究。

The main results of the paper are as follows : ( 1 ) Research on flood propagation time .