查询词典 antenna array

Servo controller is key part of antenna control system.In some servo controller,classic PID control algorithm is adopted. In order to improve precision of control system,the integral parameter has been turned too big to use because it will cause integral saturation which depress system performance.On the other hand,ISA bus is used to communicate between servo controller and main computer.ISA is low speed interface protocol,it cannot provide more data for complicated real time position control in servo controller.

伺服控制器是天线伺服控制系统的核心环节，经典的PID控制算法在整定时整定出的积分环节参数较大，很容易出现积分饱和，造成控制精度的降低；另一方面伺服系统中伺服控制器与主控计算机通过低速的ISA总线进行通信，无法满足控制器进行复杂的位置控制运算所要求的实时大信息量的数据传输。

At the same time, we propose and prove the theory model about the antenna PCB design question.

同时对TPMS的印制版设计中应注意的问题进行了理论模型的说明和论证。

The small dipole aperture antenna provides a normal way for THz radiation, for which the Drude-Lorentz theory provides method to calculate the Terahertz waves from photoconductor.

但是传统的Drude-Lorentz方法只是适用于小孔径(孔径，这里指的是偏置电压两个电极之间的距离)光导天线。

Therefore, a transmit antenna selection algorithm based on QR decomposition with column pivoting is put forward, which is easy to compute.

因此，提出了一种基于列主元QR分解的发射天线选择算法，这种算法具有很低计算复杂度。

The circular polarization performance of antenna is also very good.

天线的圆极化性能也非常好。

Millimeter wave circularly polarized microstrip antenna has the advantage of low profile,simple configuration,but commonly it has narrow impedance bandwidth and axial ratio bandwidth.

毫米波圆极化微带天线具有体积小、结构简单等优点，但是同时也存在阻抗带宽和轴比带宽相对较小的缺点。

Using a RF antenna,around outside a glass or a quartz tube,which is resonant with the right hand polarized wave propagating in a magnetized plasma,very high density plasma may be produced by Landau damping mechanism.

利用一种环绕于玻璃管或石英管外壁的射频天线与磁化等离子体中的右旋极化波的共振，可以非常有效地通过朗道吸收加热电子，产生高密度等离子体。

Therefore the development of a portable satellite antenna reception system has important practical significance.

因此开发一套便携式卫星天线接收系统具有重要的现实意义。

The dissertation includes the work as follows: Firstly, we present a random graph model with spatial reuse for a dense MANET which using directional antennas. The analytic formula of several important performance parameters for the MANET are obtained under the DSR routing protocol, such as the average flooding distance, the probability generating function of the flooding distance, the probability of a flooding route to be symmetrically valid, the average time to find a symmetrically valid route and the cost to successfully route a data packet to its destination. We compare the two models with spatial reuse and without spatial reuse by evaluating these parameters. It is shown that the spatial reuse model is much more effcctive in terms of the performance of the dense network with directional antenna, because the bigger is the degree of spatial reuse, the smaller is the average flooding distance.

在定向天线技术的支持下，建立了移动自组网络空间可重用的贝努利随机图模型，获得了DSR路由协议下平均泛洪距离的解析公式和泛洪距离的概率母函数：给出了有效对称路由概率、发现有效路由平均时间、成功路由代价等关键性能参数的解析分析；在网络性能参数定量分析的基础上，对空间可重用和无重用的网络进行了比较分析，结果显示空间重用度增大，则平均泛洪距离、路由发现时延、网络代价减少。

"A small knob or head-shaped part , such as a protuberance of a bone or the tip of an insect's antenna."

一小块球状突出物或头状部分，如一根骨头的突起或一个昆虫的触角的顶端。

"Second Life is remarkably easy to work with, and is very popular,"

"第二次生命是显着容易的工作，并且很受欢迎，"

For example, we usually assume that materials are homogeneous and isotropic and free of internal defects or flaws.

为了得到适合有限元分析的模型，我们必须经过如图2所示的简化步骤。