2) direct-reach table
直达表
3) direct wave
直达波
1.
Thus in common receiving gathers,firstly calculate the polarization coefficient of direct wave for each trace,and then use the resulted coefficients as weights to determine the main polarization direction in detector coordinates via weighted least square metho.
因而,可以在共检波点道集中,首先计算各道直达波的偏振系数,再用偏振系数作为权系数,采用加权最小二乘算法直接计算出检波器坐标中的主偏振方向,以此准确估算出检波器方位。
2.
This paper firstly established emulation mode of the transmission of outer radiant point signal,therefore calculated intensity of direct wave signal and multipath signal,and compared it with practical measure value.
首先建立了外源信号传播的仿真模型,由此推算出直达波信号与多径反射信号的强度,并与实际测量情况进行了比较验证,然后将直达波强度与多径信号强度作了对比分析,得出直达波的存在对布站的影响,从而为接收站的布置问题提供了参考依据。
3.
Interference of acoustic direct wave coming from sound source makes accurate determination of underground conditions with acoustic waves difficult.
在浅地层地下物体的声波探测中，沿地表层传播的声直达波干扰是影响探测结果的主要因素之一。
4) direct-arrival wave
直达波
1.
This paper studies the method of restraining direct-arrival wave of passive radar based on outside radiation source,which adopts the adaptive technique of phased array radar,generates zero falling in the direction of direct-arrive wave to restrain the jamming by adjusting weighted vector.
对基于外辐射源的无源雷达系统中的直达波抑制方法进行了研究,采用相控阵雷达的自适应技术,通过加权向量调整从而在直达波干扰方向上产生零陷来抑制其干扰。
5) direct-path-wave
直达波
1.
The factor to affect the performance of the passive radar is as following:direct-path-wave,multi-path effect,co-channel interference,etc.
影响外辐射源雷达性能的主要因素有直达波信号对消、多径信号对消、同频干扰的消除等,在系统设计中应进行针对性设计。
2.
When FM broadcast transmitter is regarded as extra irradiation source,multipath interference will lead to mismatch between the direct-path-wave reference signal and the echo reflected from target during matching filter,and then it will degrade the performance of moving target detection.
利用民用FM广播信号为无源雷达的外辐射源时,由于信号在空间传输时产生严重的多径干扰,导致接收站获取的直达波参考信号与目标反射的回波在后继匹配滤波时出现失配现象,严重影响了雷达的目标检测性能。
6) direct signal
直达波
1.
The detecting performance of the external illuminator base bistatistic continuous wave radar system is greatly influenced by the direct signal and the multipath reflected clutter received by the main receiving channel.
在利用外辐射源构成的收发分置连续波雷达系统中,直达波及多径杂波严重地影响了雷达对运动目标的探测性能。
补充资料：直达运输
直达运输
【直达运输】在货物运输保险中，凡使用同类运输工具运输货物，途中不论中转与否，一概视为直达运输。如泊于沿海或内河的轮船、木驳船、机帆船等为水上运输工具，大车板车、马驮等等为陆地运输工具;空中的飞机等运输工具为航空运输工具。运用以上同类运输工具运输物资投保货物运输保险时，不论中转与否，概视为直达运输，但沿海转江河或从江河转沿海，即便使用同类运输工具中转也不能作为“直达运输”。直达运输无需按联运费率增加保险费。
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