激光束的相干合成技术

本文可实现激光束相干合成的一些有用的技术作了总结，对由Ｓｃｈｕｓｔｅｒ等人 掾联ＭＯＰＡ系统进行成对共线光束合成的功率定标模型作了分析，最后，对与位相控制概念有关的作了讨论。     

脉冲多普勒雷达作为导航传感器的应用研究

分析了采用脉冲多普勒雷达作为导航传感器的可能，并说明了将这种雷达用作多普勒导航传感器的两种方法。     

DCS在网状自愈网中的应用

随着通信网向综合化，智能化的发展，自愈在网络中占有越来越重要的地位。本文首先介绍了利用ＤＣＳ的重构能力在ＳＤＨ网状自愈网中的应用，然后分析了ＳＤＨ－ＤＣＳ设备影响自愈时间的几个因素，最后提出了利用ＡＴＭ－ＶＰＸ在ＡＴＭ层实现了自愈功能。     

Performance evaluation of uplink power control algorithm over TDMA systems

Future PCS (personal communication system) cellular networks will mainly be driven by high link quality, high bandwidth utilization, low power consumption and efficient network management. Power control is one of the several major techniques which could help to achieve these goals. By exploiting power control techniques, co-channel interference could be reduced and as many links as possible could be obtained with satisfactory link quality. SIR-based (signal-to-interference ratio-based) power control was proposed as a technique for managing co-channel interference in cellular radio systems. Furthermore, new distributed autonomous feedback power control methods were introduced to achieve excellent performance without the difficult centralized control used in SIR-based methods. Unfortunately, the implementation of those power control algorithms is still challenging owing to the precision of SIR. The main aim of this paper is to investigate an uplink power control algorithm which depends indirectly on the signal-to-noise ratio in the TDMA (time division multiple access) cellular system. Simulation of the prototype hardware implementation of the receiver baseband signal processing based on the PACS (personal access communications system) specification is used as the main approach to explore the performance evaluation of this power control technique. According to simulation results, suitable values of those parameters used in this power control algorithm are derived, and the minimum frequency reuse factor under different propagation environments is also obtained for PACS under power control. © 1998 John Wiley & Sons, Ltd.     

宽带接入网

本文根据国际 ITU-T 对宽带接入网规范的研究,首先介绍宽带接入网的基本概念和业务节点接口,然后分别说明宽带接入网的几种主要功能和协议,它们是传送功能、指配功能、实时管理协调功能、宽带运载连接控制功能。     

双波长稳频CO_2激光模糊控制系统的建模与优化

报导一种模糊逻辑控制系统的建模与优化方法。以此方法设计的模糊逻辑控制器，用于双波长稳频ＣＯ２激光器的控制得到令人满意的结果。     

Integrated VP-Based Control Strategies for ATM Survivable Networks

ＩｎｔｅｇｒａｔｅｄＶＰ－ＢａｓｅｄＣｏｎｔｒｏｌＳｔｒａｔｅｇｉｅｓｆｏｒＡＴＭＳｕｒｖｉｖａｂｌｅＮｅｔｗｏｒｋｓ￥ＣｈｅｎＳｈａｎｚｈｉ；ＣｈｅｎｇＳｈｉｄｕａｎ；ａｎｄＣｈｅｎＪｕｎｌｉａｎｇ（ＳｔａｔｅＫｅｙＬａｂｏｒａｔｏｒｙｏｆＳｗｉｔ...     

Frequency support capability of variable speed wind turbine based on electromagnetic coupler

In the variable speed wind turbine based on electromagnetic coupler (WT-EMC), a synchronous generator is directly coupled with grid. So like conventional power plants WT-EMC is able to support grid frequency inherently. But due to the reduced inertia of synchronous generator, its frequency support capability has to be enhanced. In this paper, the frequency support capability of WT-EMC is studied at three typical wind conditions and with two control strategies—droop control and inertial control to enhance its frequency support capability. The synchronous generator speed, more stable than the grid frequency which is the input signal for Type 3 and Type 4 wind turbine frequency support controller, is used for the calculation of WT-EMC supplementary torque command. The integrated simulation environment based on the aeroelastic code HAWC2 and software Matlab/Simulink is used to build a 2 MW WT-EMC model and study the frequency support capability of a wind farm consisting of WT-EMC.     

Observer backstepping control of DFIG-Generators for wind turbines variable-speed: FPGA-based implementation

In this paper, we present a new contribution for the control of Wind-turbine energy systems, a nonlinear robust control of active and reactive power by the use of the Adaptative Backstepping approach based in double-fed asynchronous generator (DFIG-Generator).Initially, a control strategy of the MPPT for extraction of maximum power of the turbine generator is presented. Thereafter, a new control technique for wind systems is presented. This control system is based on an adaptive pole placement control approach integrated to a Backstepping control system. The stability of the system is shown using Lyapunov technique. Using the FPGA to implement the order gives us a better rapidity. A Benchmark was realized by a prototyping platform based on DFIG-generator, FPGA and wind-turbine; the experimental results obtained show the effectiveness and the benefit of our contribution.     

电弧炉炼钢流程多尺度控制模型研究

首先对电弧炉炼钢流程的成本控制模型与专家指导模型进行了研究。在此基础上探讨时空多尺度在电弧炉炼钢上的作用,进而实现了电弧炉炼钢流程模型的多尺度集成。模型成功应用于国内外多家企业的电弧炉生产过程,冶炼指导与经济效益显著。