波束

Methods of digital beam forming of broadband signal are studied.

研究了宽带信号的数字波束形成(DBF)方法.

The monopulse direction-finding of compare-breadth technology based on double wavebeams is introduced.

介绍一种基于双波束单脉冲电扫描比幅的测向技术.

What is really significant is the body-to-beam angle.

然而真正有意义的是弹体一波束角.

The technology of digital beamforming ( DBF) can dramatically increase array antenna performances. These performances include fast adaptive pattern nulling, ultra-low sidelobes, closely spaced multiple beams, adaptive space-time processing, high resolution direction fiding ( DF) and increased capacity for band-limited communications systems.

数字波束形成（DBF）技术可显著提高阵列天线的性能，这些性能包括：快速自适应波束置零、超低副瓣、密集多波束、自适应空时处理、高分辨测向和大容量有限带宽通信等等。

Digital Beamforming technology is very important in DBF Radar.

数字波束形成是DBF雷达实现的关键技术.

Main work include : 1 A method of adaptive DBF in received antenna array.

1讨论了在接收阵列天线中,自适应数字波束形成(DBF)的方法,引入了 采样 梯度矩阵算法.

Depending on the nature of the reflecting objects, the intensity of the reflected beam will vary.

随着反射目标的性质不同, 反射回来的波束强度也就不同.

The wave beam can be efficiently radiated from a conveniently short antenna.

波束可以从一根使用方便的短天线上有效地发射出去.

Chapter 2 discusses digital beamforming ( DBF ) of phased array radar and the amplitude and phase errors.

第二章介绍了相控阵雷达的数字 波束 形成,并对接收机的幅相误差进行了分析.

The inverse beamforming ( IBF ) algorithm is simple and easy to be used in the practical engineering.

本文给出的逆波束形成 ( IBF ) 方法具有抗多途效应效果好、算法简单、易于工程实现等优点.

The GSC is the most popular method in time domain.

宽带旁瓣对消器是最常用的一种时域宽带波束形成方法.

A beamforming model of multi-beam direct-radiating array antenna is established.

建立了直接辐射阵列多波束天线波束形成的数学模型.

The spot-beam design in the satellite-based cellular communication systems is discussed mainly.

摘要讨论了卫星蜂窝通信系统的点波束设计.

The basic concept, working principle and technical classification of smart antenna are introduced, including the description of principles and algorithms of the switched beam and tracking-beam smart antennas. The impact of the smart antenna technology on the cellular wireless communication system is also discussed.

文章简述了智能天线的概念、原理和分类，包括预多波束和自适应波束两种智能天线的原理和算法，论述了智能天线技术对移动通信系统性能的影响。

The beam angle can badly influence the inspection ability of.

波束角会严重影响单波束对海底管道的探测能力.

Moreover , the elevation and azimuth boresight pointing instability can make RASR and AASR worse repectively.

方位波束指向抖动,会使方位模糊度变差.

Such waves can be channeled easily into beam in particular directions.

这种波能在特定方向较容易地形成波束.

This thesis is arming at investigating the multi-beam forming arithmetic.

本文主要是针对飞行器共形天线 多波束 赋形算法开展研究.

To improve beamforming under low signal-to-noise ratio, a method based on stochastic resonance ( SR) in a bistable model is investigated by using a frequency scale transformation method.

为了改善低信噪比下波束形成的性能，从双稳态随机共振模型出发，提出了利用频率尺度变换，将随机共振和波束形成结合起来的算法。

Radar target azimuth information is obtained by the antenna beam scanning, the radar antenna azimuth resolution depends on the horizontal beam width, if it is a narrow beam, you can get high resolution.

雷达目标的方位信息是由天线波束扫描得到的，雷达方位分辨率取决于天线的水平波束宽度，如果是窄波束，就能得到高分辨率。

The spot-beam design in the satellite-cellular communication systems is discussed mainly.

讨论了卫星蜂窝通信系统的点波束设计.

Analyzes the mathematical similarity between the neural minor component analysis ( MCA) learning rule and beamforming optimization problem. Then, the neural MCA learning rule is used to implement robust adaptive beamforming.

分析了神经次元分析（MCA）学习规则与该波束形成优化问题在数学描述上的相似性，利用神经MCA学习规则实现鲁棒自适应波束形成。

Compared with the conventional high-resolution beam-forming algorithms, the peak energy detection algorithms have the advantage of better display performance, higher precision of target azimuth estimation and lower computation cost.

通过波束域宽带峰值能量检测处理，可以改善声纳显示效果，更加清晰地显示目标方位。相对于高分辨率波束形成算法，两种峰值能量检测算法的运算量都比较低，具有一定的工程应用前景。

The algorithm transforms the complex covariance matrix into a real matrix using an unitary transformation and then the real matrix is inversed and eigen-decomposed for adaptive beamforming so it has a low computation complexity in comparison with the ESB adaptive beamforming algorithm.

该算法利用酉变换将复协方差矩阵转换为实矩阵，然后对其求逆和特征分解进行自适应波束形成，因此其运算量比ESB自适应波束形成算法小得多。

Equipted with it, phased array radar could have Adaptive beam, lower Side-lobe beam and beam scanning.

相控阵天线通过它可以实现自适应波束、低旁瓣波束, 并通过对移相器、衰减器的控制实现波束扫描.

Distri-bution of properly controlled signal for beam forming ( amplitude control) and steering ( phase control);

传送波束形成（幅度控制）和波束控制（相位控制）的适当控制信号；

Then, an algorithm based on pilot subcarriers and virtual subcarriers is proposed.

因此, 本文提出了利用导频子载波和虚拟子载波的波束成形算法.

As examples, both a multiple circumferential slotted coaxial antenna and a microstrip slot array are designed using this method to achieve shaped radiation pattern. The shaped beam is realized by adjusting the feed line that composed of stepped impedance lines.

作为应用实例，用此算法设计了串联馈电的波束赋形天线，提出了使用阶梯阻抗线对微带缝隙和同轴缝隙串联馈电以实现赋形波束设计的方法。

Finally, the impact of the noise to the algorithm is also been discussed, noting that the algorithm only adapt to the high SNR environment. Finally, we compare the two beamforming techniques, and find each has its advantages.

最后，讨论了噪声对波束形成性能的影响，指出本算法只能适应于信噪比较高的环境。最后，对上述两种波束形成技术进行了比较。

In addition, the display and control software based on the PC platforms showed the received signal, the power spectrum diagram of Conventional Beam-forming and Minimum Variance Distortionless Response ( MVDR) Beam-forming.

此外，在PC机平台上的显控软件中显示接收信号、常规波束形成及MVDR波束形成的功率谱图。