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围长为12的QC-LDPC码连续码长的紧致下界
低密度奇偶校验码 准循环 围长 连续
2013/8/27
对于围长为12 的任意(3,L)QC-LDPC 码, 提出了连续码长的紧致下界. 当码长大于下界时围长必然为 12, 当码长等于下界时围长必然小于 12. 本文研究结论对于大围长QC-LDPC 码的存在性研究、基于中国剩余定理的大围长QC-LDPC 码构造、具有纠错能力保证的LDPC 码构造等问题具有重要应用价值.
Adaptive neuro-fuzzy inference system to improve the power quality of variable-speed wind power generation system
Wind power generation system adaptive neuro-fuzzy inference system pitch angle control power quality Matlab/Simulink
2010/10/12
In this study, an adaptive neuro-fuzzy inference system is designed for output voltage and frequency control of a variable-speed wind power generation system. Variable-speed wind power generation syst...
Corrective action planning considering FACTS allocation and optimal load shedding using bacterial foraging oriented by particle swarm optimization algorithm
FACTS devices reactive power planning load shedding BF algorithm PSO algorithm
2010/10/12
Reactive power planning (RPP) involves optimal allocation and determination of the type and size of new reactive power (VAR) supplies to satisfy voltage constraints during normal and contingency state...
Washout filter based control for the Hodgkin-Huxley nerve cell dynamics
Hopf bifurcation saddle bifurcation Hodgkin-Huxley equation potassium channel sodium channel
2010/10/12
In this work we present a washout filter based control approach for stabilizing the oscillations in Hodgkin-Huxley type neurons. The oscillations occur due to the bifurcations that arise from the pota...
New approach FPGA-based implementation of discontinuous SVPWM
Discontinuous SVPWM hardware resource saving FPGA
2010/10/12
The discontinuous space vector pulse-width modulation (DSVPWM) is a well-known technique offering lower switching losses than continuous SVPWM. At the same, average switching frequency, or a switching...
设计、分析、制作了一种工作在Ka波段的4单元高增益、圆极化机载微带天线阵列。利用顺序旋转阵列和串并馈方式的微带线网络馈电，显著改善了天线的轴比带宽和驻波带宽，减少了馈线损耗，实现了高增益。采用L型微带调配枝节对贴片单元进行匹配，便于组阵，解决了阵列空间布局不合理的难题;馈电网络和天线单元集成在同一介质基板上，易于加工和制作。测试结果表明：该天线阵具有高增益和良好的圆极化特性，从而证实了该方法的正确...
Nonlinear scattering at HF: Prospects for exploitation in OTH radar systems
Nonlinear scattering nonlinear transfer function Volterra expansion rusty bolt HF radar OTH radar HFSWR
2010/10/12
HF skywave `over-the-horizon' radars experience exceptionally high levels of clutter from the earth's surface as a consequence of their `look-down' propagation geometry. While Doppler processing is ef...
Implementation of method for operating multiple high frequency surface wave radars on a common carrier frequency
High frequency surface wave radar common frequency doppler processing ionosphere
2010/10/12
The increasing use of High Frequency Surface Wave Radar (HFSWR) for the surveillance of coastal regions is faced with the problem of limited channel availability in the electromagnetic spectrum. Thus,...
Modeling and simulation strategies in high frequency surface wave radars
Radar HF radar surface wave HF radar HFSWR propagation noise clutter RCS
2010/10/12
Surface Wave High Frequency Radars (SWHFR) are taken into account in the content of modeling and simulation challenges. Examples related to multi-mixed path surface wave propagation, radar cross secti...
Oceanography radar system WERA: features, accuracy, reliability and limitations
Radar WERA Current Waves
2010/10/12
The WERA system (WavE RAdar) is a shore based remote sensing system to monitor ocean surface currents, waves and wind direction. This long range, high resolution monitoring system based on short radio...
Dual-use of compact HF radars for the detection of mid- and large-size vessels
HF radar object detection networks ocean currents remote sensing
2010/10/12
This paper describes the development of the SeaSonde High Frequency Radar system into a dual-use application for the mapping of ocean surface currents and detection of ships at sea. This development e...
Remote sensing applications of HF skywave radar: The Australian experience
HF radar OTH radar radio oceanography
2010/10/12
Australia has conducted research into over-the-horizon radar (OTHR) for almost sixty years. Early programs focused exclusively on military capabilities, such as the detection of aircraft, missiles and...
嵌入式电力变电站继电保护系统
变电站 嵌入式系统平台 微机保护系统
2012/4/22
为解决电力变电站保护系统可扩展性差及低成本开发， 提出了一种集保护、 控制和远程监控于一体的微机 保护控制系统。文中设计了微机保护系统构架， 搭建了嵌入式硬件平台， 讨论了相关功能模块， 改进了软件系统 设计， 并对信号采集、 数据处理等问题作了研究。初步试验效果令人满意， 表明该设计是成功的。
通过对虚拟仪表技术的研究， 利用 Ｖ Ｃ ６ ． ０多线程编程实现串口通信， 对串口接收到的数据帧进行快速处理 和存储， 保证了数据的完整性、 最新性、 准确以及处理过程的快速性， 并且通过对 Ｇ ＬＳ ｔ ｕ ｄ ｉ ｏ 虚拟仪表动态链接库 Ｄ Ｌ Ｌ文件外部接口的设计， 实现 Ｇ ＬＳ ｔ ｕ ｄ ｉ ｏ 虚拟仪表嵌入 Ｖ Ｃ对话框程序的功能。实验结果表明， 该方法对虚拟 仪表的实时精确及多功...