地面传播

对不同掠射角和土壤条件下的IR-UWB反射波形进行了研究，得出IR-UWB信号近地面传播反射时的波形变化规律。

In different grazing angle and soil conditions , the IR-UWB reflection waveforms are studied and the near-ground reflection rules are obtained .

梯级先导离开云底向地面传播的速度为2.7×105m／s；

The speed of stepped leader below thunderstorm to the ground is about 2.7 × 10 5m / s.

详述数字电视DVB-T标准，MPEG-2TS传输码流的形成；专门针对地面传播的信道编码技术和COFDM调制方式。

Summarized the digital TV 's international development , depicted digital TV DVB-T criterion and the shape of MPEG-2 TS , the channel code method and COFDM modulation for terrestrial transmission .

在此信道模型基础上，对IR-UWB信号近地面传播时的路径损耗和多径效应等特性进行了研究并得出了相关结论，为IR-UWB技术的实际应用提供了依据。

With the channel model , the path-loss properties and multi-path effect of the IR-UWB signal near-ground propagation are studied and the results are received . Finally , researches on the applications of the IR-UWB technology in the landmine are carried out .

研究并确定了基于时间到达的地雷节点自定位方法，根据IR-UWB信号近地面传播特性研究的相关结论，对定位测距误差进行了分析，并提出了提高地雷节点自定位精度的方法。

The self-localization method of the landmine node base on the time of arrival ( TOA ) ranging algorithm is studied . With the results of the near-ground propagation characteristics , the location and ranging error are analyzed , then the method of improving the self-localization precision are given .

沿不规则不均匀地面传播的侧面波

Lateral wave propagating along irregular and inhomogeneous ground

在他们的研究中，地板的类型也起到决定性作用。地毯型的地面传播最少的细菌。

In their study , the type of floor mattered . Carpeted floors were least likely to transfer bacteria .

地震时地震波沿地面传播引起地面位移，地面沿直管轴向位移时使管道产生轴向拉伸应力。

When earthquake happens , the propagation of the seismic wave results in the displacement of the surface soil of the earth . As the surface soil moves towards the axial direction of the pipeline , the tensile stress in the pipeline is produced .

闪电最先会形成一个叉状电荷，又被称为先导。先导会从云端伸出向下延伸，以每秒几十到几百千米的速度向地面传播，在几十毫秒的时间内穿过几千米长的空气到达地面。

The strike starts with a branching bundle of charge-the " leader " - descending from the cloud . It spreads downward at speeds of tens to hundreds of kilometers per second , covering the few kilometers to the ground in a few dozen milliseconds .

对具体地面电波传播的信号进行测试。

The signals was measured of electromagnetic wave propagation on the ground .

秸秆覆盖阻挡了太阳辐射向地面的传播，土壤温度也随着覆盖量的增加而下降。

As the radiation to the ground was blocked by the straw mulching , the soil temperature decreased as the quantity of the mulched straw increased .

特别是把短波单边带通信，地面波传播方式和双音报警技术引入天气警报服务系统，开辟了短波单边带气象通应用的新领域。

Specially , short wave single side band ( SW SSB ) and ground wave transmission and technology of double tone giving an alarm are used in weather warning service , as a result a new field of using SW SSB meteorological communication is set up .

高频电磁波在有损地面上的传播特性

Transmission Characteristics of HF Electromagnetic Wave on Lossy Ground

视距传播中地面起伏对传播中值衰减的影响

Effect of the Roughness of the Ground - surface on the Line-of-sight Propagation

最后分析了气锤振动的地面波的传播和衰减。

Finally , the propagation and the attenuation of the ground wave of hammer vibration are discussed .

基于对热模锻压力机车间的振动实测，对热模锻压力机激起的地面振动的传播与衰减作了更切近实际的分析，得出了热模锻压力机引起的地面水平向振动不可忽略；

Based on a field measurement of the vibration in hot forging press workshop , a realistic analysis is made on propagation and attenuation of the ground vibration . It is shown that the horizontal vibration caused by the hot forging press can not be negligible .

地铁运行引起的地面振动实测及传播规律分析

Field Measurement and Analysis of Ground Vibration Induced by Subway Trains

含水与不含水地层的分层交错对地面运动和波传播的影响

Effect of alternate dry and saturated soil layers on ground motion and wave propagation