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波束     
相关语句
  beam
     Study on Beam Scattering from Rough Surfaces and Its Applications
     粗糙面波束散射研究及其应用
短句来源
     Scattering of Gaussian Beam by Object with Rough Surface and Its Application on Laser One-dimensional Range Profile
     粗糙物体高斯波束散射及在激光一维距离成像中的应用
短句来源
     PHASE THEORY OF ANTENNA BEAM
     天线波束相位理论
短句来源
     Comparison of Net Gain of Vertical Narrow-Beam Antennas and Symmetrical (or Near Symmetrical) Beam Antennas on Troposcatter Communications Circuit
     在对流层散射通信电路上垂直窄波束天线与对称(或近似对称)波束天线的净增益之比较
短句来源
     A DUAL BEAM MICROWAVE SYSTEM SUITABLE FOR MEDlDAL USE
     医用双波束微波系统
短句来源
更多       
  wave beam
     The propagation of wave beam in composite random medium
     复合随机介质中波束的传播
短句来源
     A measurement system was provided for measuring an average transverse wave velocity and attenuation coefficients of underwater acoustic materials in the frequency range 10-100 kHz, with the characteristics of small size and narrow wave beam in the low frequency range.
     提出了测量10-100 kHz频段水声材料平均横波声速和衰减系数的测量系统,系统具有低频、小尺寸、窄波束的特点。
短句来源
     In the two principal planes—H plane and E plne, the patterns and the field distribution characteristic of wave beam are measured.
     在两个主平面——H平面或E平面上,对其方向图及波束场分布特性进行测试。
短句来源
     STUDY ON WAVE BEAM SPLITTING IN STEPPED RECTANGULAR WAVEGUIDE
     矩形阶跃波导中波束分裂的研究
短句来源
     In the light of error theory and coordinate conversion, a detailed analysis is made of the errors resulting from the propagation and coordinate conversion of the speed variables in the Doppler Sonar Navigator and the errors occurring in the wave beam angles of the converter. The regular variations of the errors are also examined.
     本文根据误差理论和坐标变换原理,详细分析了多普勒声纳导航仪速度参数的传播误差、坐标转换误差和换能器波束开角误差及其变化规律。
短句来源
更多       
  the beam
     In this paper,a multi-beam broadband constant beamwidth beam former system is proposed using TMS320F206 and IMSA100 as main chips to realize the beam forming procedure in real time with high speed.
     文章提出来 用TMS320F206及IMSA100为主要芯片,构成多波束宽恒定束宽波束形成器,可实现实时、高速、 高性能的多波束宽带恒定束宽波束形成,并给出了具体设计方案。
短句来源
     Finally the 1.06 μm laser beam scattering from rough sphere is numerically computed, and the influence of the beam factor, permittivity and polarization on coherent LRCS is analyzed.
     最后数值计算了1.06μm激光波束对粗糙球的散射,分析了波束因子,介电常量和极化状态对红外激光相干散射截面的影响,重点讨论了波束因子的变化规律。
短句来源
     STUDY OF THE BEAM TRANSMISSION PROPERTIES OF RADOME USING COMPLEX RAY THEORY
     用复射线理论研究波束经天线罩的传输
短句来源
     Then the neighbors forward the received data to the sink as virtual antenna by using the beam forming technique,which enhances the power of the received signal,and accordingly improves the capacity of wireless sensor networks.
     由数据源节点将信息发送给尽可能多的周围邻居节点,然后这些邻居节点充当波束成形技术中的虚天线将收到的包转发给接收节点,以此增大接收节点所接收到的信号功率,从而提高无线传感器网络的容量。
短句来源
     The operating principle and basic calculating formula of the beam controller are described in brief ,the designing methods of the hardwre and software of the beam controller are introduced in details,and finally the characteristics of the computers applying to the beam controller are analyzed.
     简述了三坐标雷达波束控制器的工作原理及其基本计算公式 ,重点介绍了波控器的硬件设计与软件设计方法 ,最后分析了计算机应用于波束控制器的特点。
短句来源
更多       
  beam wave
     Scintillation of beam wave propagation along Earth-space paths from outer-scale of turbulent atmosphere
     湍流大气外尺度对波束地-空传播闪烁影响研究
短句来源
     Based on the theory of optical beam wave propagation and the ITU-R C~2_n model and a modification of the Rytov method that incorporates spatial frequency filter function under strong fluctuation conditions, according to the zero inner scale spectrum model, the scintillation index model of Gaussian laser beam wave as a function of the Rytov variance is obtained from weak to strong fluctuation regions on horizontal and earth-space paths.
     根据光波波束传播理论及ITU-RC2n模型,应用在强起伏下引入空间滤波函数的修正Rytov方法,在零内尺度湍流谱模型下,得到了从弱到强起伏下的高斯波束激光在水平和地-空路径上闪烁指数随Rytov方差变化的模型。
短句来源
     Under some conditions, the model can be converted into the scintillation index model for beam wave propagation on horizontal sight paths and also degraded to plane and spherical wave scintillation models, respectively.
     该模型在相应的条件下分别可转变为波束波水平视距路径传播的闪烁模型和平面、球面波的闪烁指数模型。
短句来源

 

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      beam
    Microlocal Analysis of an FBP Algorithm for Truncated Spiral Cone Beam Data
          
    Derivation and analysis of a new reconstruction formula from cone-beam projections
          
    A new method to compute the first derivative of 3-D Radon transform is given for cone-beam data taken from any orbit.
          
    Smith [11] and Grangeat [5] even derived cone-beam inversion formulas which are the basic work in fully 3-D image reconstruction algorithm and are used extensively now.
          
    Boundary stabilization of nonuniform Timoshenko beam
          
    更多          
      wave beam
    An analytic and numerical investigation is made of the self-focusing of a wave beam allowing for the inertia of the nonlinear response of the medium described by an acoustic type of equation.
          
    A 3D model is developed, which describes the propagation of an initiated high-pressure microwave discharge in a linearly polarized wave beam.
          
    Quasi-stationary stage of a nonequilibrium optical discharge in the field of a Bessel wave beam
          
    It is established that the nonlinear wave beam can be localized in the region between these interfaces.
          
    Behind the resonance surface, a narrow incident wave beam generates a beam propagating along the magnetic field.
          
    更多          
      the beam
    Two plane-parallel wettable plates are immersed in the liquid in symmetrical positions with respect to the point of incidence of the beam on the liquid.
          
    If detected, at the same geocentric distances (2-4RE) the "continuum" demonstrated a strongly variable and perturbed character, as well as a considerably larger extension of the beam over the geomagnetic latitude (10°-20° and more).
          
    It examines the effect of the field of the beam and of the inherent volumetric charge of the tag on the results of the measurements; the conditions under which this effect can be neglected are calculated.
          
    Experiments show that under these conditions the direct flow hardly goes beyond the limits of the beam.
          
    Inflow into the main stream takes place at every point on the lateral surface of the beam [7], with the possible exception of the region near the emitter where the acoustic field is substantially nonuniform [8].
          
    更多          
      beam wave
    Topological reactions in the beam wave resulting in the sign inversion of the optical vortex upon the intersection of the wave-front edge dislocation are considered.
          
    A generalized approach to beam wave interaction with a dielectric interface
          
    This delay between the pump pulses can be then mapped onto the spatial coordinate with the use of a broad-beam wave-mixing or pump-probe geometry.
          
    Experiments are conducted to test extant theory on the effect of uniform rotation Ω on the angle θ of conical beam wave propagation excited by a sphere vertically oscillating at frequency ω in a density stratified fluid.
          
    For this purpose a Gaussian-beam launcher is used to irradiate selectively the test-material at the particular position of interest; and a reflectometric bridge arrangement is used to measure the amplitude and phase of the reflected beam wave.
          
    更多          


    A method based upon simple diffraction theory is described for the calculation of modified paraboloid reflectors to produce from a point source a shaped beam of arbitrary shape in one plane and uniformly narrow in the perpendicular planes. A specific application of the shaped beam antennas is in connection with radar antennas designed for height finding. In this case the antenna must have a sharp elevation beam for obtaining precise elevation information and a rapid elevation scan. The beam must be relatively...

    A method based upon simple diffraction theory is described for the calculation of modified paraboloid reflectors to produce from a point source a shaped beam of arbitrary shape in one plane and uniformly narrow in the perpendicular planes. A specific application of the shaped beam antennas is in connection with radar antennas designed for height finding. In this case the antenna must have a sharp elevation beam for obtaining precise elevation information and a rapid elevation scan. The beam must be relatively broad in azimuth in order that the target will be held in the beam long enough to obtain height information. If a fixed minimum of illumination is to be achieved at a given linear distance on both sides of the center line of the azimuth beam, the amplitude pattern must have the so-called "double cosecant" or "beavertail" shape.

    本论文讨论如何利用简单衍射理论,计算改良抛物面反射器天线幅射之图型。此反射器可将一无方向性辐射源之能量聚集于任何形状之波束中。此原理可以应用在地面上或船面上寻求飞机高度雷达天线之设计。在此类雷达中,天线之方位图型必须为“双馀割平方”式;其特性为自波束对称轴线起,至其两端,辐射一次路程之功率,与方位角之馀割平方成正比。得此图型之最简易方法为置一狭窄之铅垂金属条于一截形抛物面反射器之中心,金属条之宽度,可改变波束之方向性;其支距,即金属条与反射器之距离,可影响两反射波之位相。故改变金属条之宽度及其支距,可得欲得之图型。 利用衍射及干涉理论,计算金属条及截形抛物面所生之总图型为:在方位面内,幅射强度J_H与水平角θ之关系为: J_H =AA[sin~2(15πsinθ)/(15πsinθ)~2-2(1-cosπ/4)sin(2πsinθ)/2πsinθ(sin(2πsinθ)/2πsinθ-sin(15πsinθ)/15πsinθ)]A为辐射波振幅,A为A之复共轭数。计算之结果与实验之结果,颇为一致。

    ~~

    本文对采用迴旋形扫描的空用搜索雷达提出了平均作用距离的概念,提出了在有扫描重叠的情况下平均作用距离的计算方法,并得出相邻扫描波束在不同交叉角时平均作用距离与最大作用距离之间的关系,作为选择适当的交叉角的参考。

    Two noise cancelling models designed with Wiener criteria of least mean square are shown in this paper. The general formula for calculating output signal-to-noise ratio is presented and the practical test rule for adaptive beamforming which employ those models are given.

    本文给出按Wiener最小均方差准则设计的两种噪声抵消系统模型。给出计算输出信噪比的一般表达式,提出了把这种模型用于自适应波束成形时的实际检验准则。提出一种多波束自适应噪声抵消系统,分析了它的主要性能。本文的全部讨论都在频域上进行,文中给出利用信号平均功率谱密度和最佳线性滤波器的传输函数计算系统指向性的方法,给出了多波束噪声抵消法在自适应前后的指向性公式。实际的例子说明这种系统在抑制为数不多的干扰时具有很大的优越性。

     
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