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antenna beams
相关语句
  天线波束
     Through processing signals received by the array element in weighted way to form antenna beams,smart antennas let the antenna's major lobe point to the coming direction of reference user and the side lobe point to the coming direction of interference user and suppress interference and improve receiving sensitivity.
     通过对阵元接收信号加权处理,形成天线波束,使天线主波束对准用户信号到达方向,旁瓣或零陷对准干扰信号到达方向,可达到抑制干扰、提高接收灵敏度的目的.
短句来源
  “antenna beams”译为未确定词的双语例句
     Through designing the antenna radiation character effectively, antenna beams’directionality and other character can be controlled, high channel capacity and utilization rate of spectrum can be achieved, resulting in optimizing the performance of the system.
     平流层通信中为了充分利用有限的频谱资源,平流层通信平台使用多波束天线在地面上形成蜂窝小区结构,这样空间分离的用户可以复用无线信道,因此其多波束覆盖结构的设计是平流层通信系统容量提高的关键因素。
短句来源
  相似匹配句对
     Antenna Test
     天线测试
短句来源
     The Sinuous Antenna
     曲折臂天线
短句来源
     The Baseband Digital Beamforming Algorithm for Smart Antenna Fixed Beams Based on QPSK
     基于QPSK的智能天线固定多波束基带DBF算法
短句来源
     Application of multi-objective optimization methods to the printed antenna with sum/difference beams
     遗传算法在和差波束印刷天线中的应用
短句来源
     BENDING OF SANDWICH BEAMS
     三合板梁弯曲问题
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  antenna beams
One is a multi-beam-horn antenna that enables high-speed transmission, and the other is an array antenna that digitally controls antenna beams.
      
Measurement of the six-beam-switched antenna was also conductedand showed the accurate generation of six switchable antenna beams.
      
These radar mappings also needed the narrow antenna beams, now available with large radio telescopes such as those at the Arecibo and Haystack Observatories.
      
It was found that the NSCAT-2 wind vectors exhibit systematic directional preference relative to antenna beams.
      
We estimate the number of antenna beams per source that are required to reach a specified sensitivity in deep surveys.
      
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The analytical expressions derived from the composite random surface scattering theory are presented in this paper for calculating sae surface scattering coefficient in the quasi-specular region, and the theoretical values for this coefficient are thus obtained at three typical frequencies in K, X and C band respectively, revealing a result, which is contrary to the conventional conclusion, that under the same conditions the real scattering coefficient of the sea decreases with the increase of the radar frequency....

The analytical expressions derived from the composite random surface scattering theory are presented in this paper for calculating sae surface scattering coefficient in the quasi-specular region, and the theoretical values for this coefficient are thus obtained at three typical frequencies in K, X and C band respectively, revealing a result, which is contrary to the conventional conclusion, that under the same conditions the real scattering coefficient of the sea decreases with the increase of the radar frequency. The antenna beam correction for the measured scattering coefficient at normal incidence, operated in the beamwidth-limited mode and pulsewidth-limited mode, is then based on this theoretical sea surface scattering signature and the radar equation. Correction values are computed for several beamwidths at the same frequencies over a range of surface wind speeds from 1 m/sec to 18m/sec, and an experimental verification is made for 13.9 GHz. It is further shown that the correction value for narrow beamwidth can also be applicable to any kinds of land terrain. The conclusions drawn from this study not only are important to the development of algorithms and the extraction of information but also provide a sound basis for determining some parameters of airborne-and spaceborne-radar altimeter.

本文给出了以组合随机表面散射理论为基础,用于计算准镜面反射区内海面散射系数的各有关解析式,并计算出对应于不同风速下的K、X和C波段三个典型频率上海面散射系数的理论值,揭示了与以往传统认识相反的一个结论,即:在其它条件相同的情况下,海面散射系数实际上是随着雷达波频率的增高而减小的。之后,根据海面理论散射特征和雷达方程,导出了波速限制工作状态和脉宽限制工作状态下垂直入射时,海面散射系数的天线波束校正方法,并计算了在1—18m/sec风速范围内、对应于几个不同天线波束宽度的,上述三个频率上海面散射系数的校正量。接着对13.9GHz的有关校正量作了实验数据的验证。对于窄波束天线来说,所得的校正量同样也可适用于各类陆部地物。由这一研究所得的结论,不但对于相应的地球物理学算法的建立和遥感信息的提取具有重要意义,而且也为机载和星载雷达高度计某些参数的确定提供了依据。

The traditional requirements for the antenna are reviewed. Under such background and on the basis of previous work, the subjects concerning the phase of antenna beam and the current distribution of antenna aperture, such as the phase reference point, the trans-formation'relationship of the far field patterns corresponding to different phase reference points of an antenna, the null level and phase difference between the adjacent beams, and the resolution of current distribution of...

The traditional requirements for the antenna are reviewed. Under such background and on the basis of previous work, the subjects concerning the phase of antenna beam and the current distribution of antenna aperture, such as the phase reference point, the trans-formation'relationship of the far field patterns corresponding to different phase reference points of an antenna, the null level and phase difference between the adjacent beams, and the resolution of current distribution of the linear array are systematized and discussed. The general condition of the beam in phase and the condition of the symmetrie beam of a con-tinuous linear array are given and proved theoretically. Some theorems are proposed, and the whole is termed the phase theory of antenna beam.

本文简要地回顾了传统上对天线的要求,并以实例说明随着近代科学技术发展的需要,天线波束的相位特性应该引起重视和研究,在此背景下本文试图将天线波束相位和孔径电流分布等有关问题系统化,在前人工作的基础上,总结并讨论了关于相位参考点、不同相位参考点的天线方向图的变换关系、方向图的零点电平和相邻波束间的相位差,线阵电流分布的分解;提出并从理论上证明了天线同相波束的普遍条件和连续线阵的对称波束条件。归纳为几个定理,并将这些论述统称为天线波束相位理论。

This paper describes a method in which a shaped communication satellite antenna beam is generated. All mathematical formulas required for the method derived here and elsewhere are presented. As an example, a shaped beam for Chinese satellite is calculated. The final results are a group of the optimum feed coefficients for the component beam and a plot with the -3dB and -5dB gain contours on a satcentric map. The -3dB contour rounds the territory of China (not including the South sea) satisfactorily...

This paper describes a method in which a shaped communication satellite antenna beam is generated. All mathematical formulas required for the method derived here and elsewhere are presented. As an example, a shaped beam for Chinese satellite is calculated. The final results are a group of the optimum feed coefficients for the component beam and a plot with the -3dB and -5dB gain contours on a satcentric map. The -3dB contour rounds the territory of China (not including the South sea) satisfactorily with a gain of 27 dB.

本文提出了一种成形的通信卫星天线波束的产生方法。文中部分地推导了并系统地给出了波束成形计算所需的全部数学公式。做为一例,对中国卫星的成形波束进行了实际计算。计算结果是一组最佳子波束馈电系数和一张绘于星心球面地图上的天线增益等值线图。图中-3dB等值线满意地与中国国土(未含南海诸岛)相吻合。

 
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