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antenna scan
相关语句
  天线扫描
     Simulation of Antenna Scan Based on Simulink
     基于Simulink的天线扫描仿真
短句来源
     Momentum Compensation Simulation Method in Antenna Scan abou t Spaceborne Microwave Imaging Instrument
     星载微波成像仪天线扫描中动量补偿仿真的方法
短句来源
     The satellite antenna scan drive institution is a core component of the whole satellite system, which has an effect upon the attitude of satellite and gathering data.
     卫星天线扫描驱动机构是整个卫星系统的核心部件,对卫星的运行姿态和数据的采集起着至关重要的作用。
短句来源
     The satellite antenna scan drive institution is a core component of the whole satellite system, which has an effect upon the attitude of satellite and gathering data.
     卫星天线扫描驱动机构是整个卫星系统的核心部件,对卫星的运行姿态和数据的采集起着至关重要的作用。
短句来源
     Based on the explanation of simulation tool Simulink, modules of antenna scan simulation used in Simulink are discussed in detail and the parameter settings are given.
     对使用的仿真工具Simulink进行了简要说明,并在此基础上详细讨论了天线扫描特性仿真中用到的Simulink模块,给出了具体的参数设置。
短句来源
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  “antenna scan”译为未确定词的双语例句
     Antenna scan and its characteristic are introduced and the sector scan and conical scan are analyzed especially according to the characteristic of radar search and track.
     介绍了雷达天线的扫描特点,根据雷达搜索和跟踪的特点对扇形扫描和圆锥扫描进行了重点分析;
短句来源
  相似匹配句对
     Simulation of Antenna Scan Based on Simulink
     基于Simulink的天线扫描仿真
短句来源
     (2) the effects of antenna scan to the spectrum of noise;
     天线扫描运动对杂波谱的影响;
短句来源
     Antenna Test
     天线测试
短句来源
     NEWS SCAN
     外刊扫描
短句来源
     FASHION SCAN
     时尚速览
短句来源
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  antenna scan
When multiple antennas can not be used in mobile units, user cooperation can be employed to provide transmit diversity.
      
In wireless cellular systems, a code division multiple access (CDMA) technology with array antennas can significantly reduce interferences by taking advantage of the combination of spreading spectrum and spatial filtering.
      
Theuse ofdual-polarized antennas is a cost- and space-effective alternative where twospatially separated uni-polarized antennas can be replaced by a singledual-polarizedantenna element.
      
Directional antennas can adaptively select radio signals of interest in specific directions, while filtering out unwanted interference from other directions.
      
It is found that the use of two antennas can improve the performance of all four transmission strategies by about 25% in a Rayleigh fading environment.
      
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Weather radar is one of the major sounding tools for the prediction of small scale and middle scale weather phenomena.The ground clutters seriously effect the recognition of weather echoes、 accuracy of measuring rain rate and further processing of radar data.From the point of view of the situations of the economy and the situations of the present weather radar,non-coherent 3-pulse canceller is selected for rejecting ground-clutters and abstracting weather signals.For model 713 weather radar ,prf=200hz,antenna...

Weather radar is one of the major sounding tools for the prediction of small scale and middle scale weather phenomena.The ground clutters seriously effect the recognition of weather echoes、 accuracy of measuring rain rate and further processing of radar data.From the point of view of the situations of the economy and the situations of the present weather radar,non-coherent 3-pulse canceller is selected for rejecting ground-clutters and abstracting weather signals.For model 713 weather radar ,prf=200hz,antenna scanning 3rpm and waTelength-3cm,the following results are obtained:ground clutter cancellation rate more than 21db and weather signal loss less than 5db.

气象雷达是中小尺度天气预报的主要大气探测工具之一。地物杂波严重干扰气象回波信号的识别、影响降雨量的定量测定和雷达数据的进一步处理,本课题从经济和现役天气雷达的现状出发选用非相参三脉冲对消器来抑制地物杂波,提取气象信号。本抑制器在脉冲重复频率200Hz,天线转速3转/分,脉冲宽度2μs,波长6.6cm的713雷达上作实验,取得地物杂波抑制比大于21分贝,气象信号损失小于5分贝的结果。 本文对气象雷达地物杂波抑制器的可取方案进行简要分析,给出二脉冲和三脉冲对消器的杂波和气象信号的衰减曲线,对本课题的非相参MTI系统进行说明,最后给出外试验埸结果、分析以及今后的工作的设想。

The conventional two-dimensional ray-tracing technique is a classical method for analysis of antenna-radom systems. How-ever, in point of detail treatment for field distortions introduced by the radom using above technique, the accuracy is usually uncertain due to the inherent errors associated with the ray-tracing approximation of the antenna near field.A very effectivy approach based on sampling theorem using plane wave spectrum (PWS) method is given in this paper, the effects of airborne radome...

The conventional two-dimensional ray-tracing technique is a classical method for analysis of antenna-radom systems. How-ever, in point of detail treatment for field distortions introduced by the radom using above technique, the accuracy is usually uncertain due to the inherent errors associated with the ray-tracing approximation of the antenna near field.A very effectivy approach based on sampling theorem using plane wave spectrum (PWS) method is given in this paper, the effects of airborne radome on antenna radiation pattern are analysed from many aspects. Besides the analysis of regul arapparent boresigh error. Stress is put on the calculations of radom cross-polarization fields and sidelobes (flash lobe) induced by the reflection on inner surface of radom. A number of useful curves of every variation is shown and the varying regulations with respect to antenna scanning angle are also discussed.

本文利用平面波谱概念,经恰当地选取离散抽样点,通过数值算法比较全面地分析了罩对天线方向图的影响,除常规的视轴误差分析之外,着重计算了交叉耦合场和由罩壁反射引起的天线远场方向图中的闪烁瓣,并讨论了这些影响随天线扫描角的变化规律。

In this paper, detailed analysis on the principle, functions and characteristics of microwave radiometer using two reference temperatures with automatic gain compensation is made, and proposes a method of correctting calibration characteristic of two reference temperatures microwave radiometer. It also concerns to develop a airborne/ground based 13 mm microwave imaging radiometer with micro-computer control of antenna scanning, real-time data collecting and processing, falsecolour imaging, man-computer...

In this paper, detailed analysis on the principle, functions and characteristics of microwave radiometer using two reference temperatures with automatic gain compensation is made, and proposes a method of correctting calibration characteristic of two reference temperatures microwave radiometer. It also concerns to develop a airborne/ground based 13 mm microwave imaging radiometer with micro-computer control of antenna scanning, real-time data collecting and processing, falsecolour imaging, man-computer dialogue, and data recording on diskette.

本文对双参考温度自动增益补偿型微波辐射计的工作原理、性能及参数指标进行了详细分析,提出了对于双参考温度辐射计的定标特性进行校正的方法。设计研制出了用于实时遥感大气水汽含量及有关参数的机载/陆基13mm成像微波辐射计系统,采用微型计算机实现天线的扫描控制、实时数据采集、人机对话、假彩色成像及用磁盘记录数据。

 
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