控制信号

Most of Chinese GPR have not as good performances as ones abroad. In the paper, the GPR system developed by us employs several optimization techniques to enhance the system performances, including antenna, sampling-hold circuit, orientation wheel, function of system software, multithreading, and signal processing algorithms. As the result the system works more well with these techniques, and its azimuth and distance resolution of 10 cm has been achieved with detection depth of more than 50 cm.

本文根据探地雷达系统工作原理，在电子科技大学探地雷达系统样机研制的基础上采用了各种有效的优化技术，包括探测前端、采样保持电路的优化，定位轮、目标定位、多线程技术的应用，数据采集处理和控制软件功能的拓展、各种有效的信号预处理算法的应用等，显著提高了系统的探测性能和增强了探测效果，使得系统方位、距离分辨率均达到了10cm，探测深度大于50cm，其性能指标达到国外先进水平，为进一步的实用化奠定了重要的基础。

Based on the analysis of characteristics of smart antenna,detailed discussion is performed for the theoretical methods of smart antenna. According to different methods of antenna beam processing and forming,smart antenna's architecture and classification are introduced.

0引言智能天线的概念是90年代初由一些学者提出，在微波技术、自动控制理论、自适应天线技术、数字信号处理技术和软件无线电技术等多学科基础上综合发展而成的一门新技术。

"The receiver incremental Tuning control is used to fine tune to the received signal. This is used in USB and LSB modes to obtain maximum clarity of reception, and in CW mode to control the pitch of the beat note."

收信机微调旋钮是用微调调整使你能收到被认为是标准的信号，在USB和LSB模式使用可以获得最清晰的接收，在CW模式可以控制节拍的音调。

RIT control. The receiver incremental Tuning control is used to fine tune to the received singal . This is used in USB and LSB modes to obtain maximum clarity of reception, and in CW mode to control the pitch of the beat note. The RIT Control can tune the receive frequency about 2.3 KHz. This control will not transmit frequency, or the frequency display, but will change the receive frequency.

RIT control ：收信机微调旋钮是用微调调整使你能收到被认为是标准的信号，在USB和LSB模式使用可以获得最清晰的接收，在CW模式可以控制节拍的音调，这个旋钮能在2.3KHz左右调整接收频率，它不影响发射频率和显示频率，但将改变接收频率。

A sensing circuit senses a black current level of the electron beam corresponding to the black level of the video signal and feeds back information about the black current level to the black level controlling circuitry for stabilizing the black current level.

检测电路对与视频信号的黑色电平相对应的电子束的黑色电流电平进行检测，并将与黑色电流电平有关的信息反馈给黑色电平控制电路，以便稳定黑色电流电平。

5The blasting vibration signals are analyzed by time-energy analysis. Identify the time of detonator priming and ascertain reasonable subordinate interval in millisecond delay blasting to decrease blasting vibration and control the damage of blasting. In this paper, wavelet analysis is used to de-noise the blasting vibration signals.

利用基于小波变换的时－能密度法具有的良好的突出被分析信号能量突变的特点，有效地识别微差爆破中各段雷管的起爆时刻，从而确定微差爆破中合理的微差延时，达到降低爆破震动，控制爆破震动危害的目的。

If the resistance rises to the pre-set number(1245－1470Pa), the controller will send out signals, first to control the lift valve to do these operations: close the hole of the valve board to cut air current and stop filtering, and then to open the electromagnetic pulse valve to blow compressed air whose pressure is 0.5-0.7Mpa into filter bag with a short time(0.01－0.12s).

当含尘烟气由进风口进入灰斗以后，一部分较粗尘料在这时由于惯性碰撞、自然沉降等原因落入灰斗，大部分尘粒随气流上升进入袋室，经滤袋过滤后，尘粒被阻留在滤袋外侧，净化的烟气由滤袋内部进入箱体，再由阀板孔、出风口排入大气，达到收尘的目的，随着过滤过程的不断进行，滤袋外侧的积尘也逐渐增多，从而使除尘器的运行阻力也逐渐增高，当阻力增到预先设定值（1245－1470Pa）时，清灰控制器发生信号，首先控制提升阀将阀板孔关闭，以切断过滤烟气流，停止过滤过程，然后电磁脉冲阀打开，以极短时间（0.01－0.12s）向箱体内喷入压力为0.5－0.7Mpa的压缩空气，压缩空气在箱体内迅速膨胀，涌入滤袋内部，使滤袋产生变形、震动，加上逆气流的作用，滤袋外部的粉尘便清除下来掉到灰斗，清灰完毕之后，提升阀再次打开，除尘器又进入过滤状态。

Because nine laser range finders, two tactile/slip sensors, a 6-dimension force/torque sensor, a flexible equipment RCC with compliance and over-load protection and automatic lock mechanism and many sensor's signal processing circuits are integrated into the gripper body, the gripper system is characteristic of reasonable design, compact structure and high-integration.

成功地研制出用于地面模拟实验的多传感器集成手爪系统，该手爪设计合理，结构紧凑，将九个激光测距传感器、两个触/滑觉传感器、一个六维力/力矩传感器、带有自动锁紧机构的RCC装置和多个传感器信号处理及控制电路集成为一体，具有非常高的集成度。

These include: ground and coastal border protection systems based on radar and image intelligence designed to control international frontiers, airports, harbors, ground passes and railways; Signal Intelligence information gathering systems focusing on terrorist infrastructures; and commercial aircraft self-protection systems.

这些措施包括：地面和沿海边境保护系统基于雷达和图像情报旨在控制国际边界，机场，港口，地面传球和铁路信号情报信息收集系统，重点是恐怖主义的基础设施；和商用飞机自保护系统。

The principle of this kind of automatic ice thickness monitoring system is realized by detecting the vertical distance between the ice bottom and a fixed point in the water, which is measured by using a barrel moving from the fixed point to the ice bottom.

随浮桶一起运动的压差式水位传感器分别给出浮桶位于固定端和冰层底面的位置，而浮桶的运动则依靠数据采集仪控制浮桶内水泵排吸水改变浮桶的重力来实现，并且该仪器能够记录传感器的信号和设置水泵开关的开、闭时间。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。