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HDTV接收机的位同步系统
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作者 张朝阳 仇佩亮 姚庆栋 《通信学报》 EI CSCD 北大核心 1997年第10期38-42,共5页
本文参照美国大联盟(GA)HDTV传输系统的有关标准,给出了一种基于数据辅助(DA)算法的位同步系统实现方案。文中讨论了作为辅助数据的段同步图案对位同步性能的影响,并给出了系统在噪声条件下的收敛性和抖动性能的仿真结果... 本文参照美国大联盟(GA)HDTV传输系统的有关标准,给出了一种基于数据辅助(DA)算法的位同步系统实现方案。文中讨论了作为辅助数据的段同步图案对位同步性能的影响,并给出了系统在噪声条件下的收敛性和抖动性能的仿真结果。该系统对于基带数据流含有段、帧同步的通信场合具有一定的适用性。 展开更多
关键词 HDTV 接收机 位同步系统
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基于MAX125的14位同步数据采集系统研制 被引量:2
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作者 刘靖 程前义 《湖北电力》 2003年第3期20-22,共3页
 介绍了一个高精度多路同步数据采集系统的设计及其在电力系统中的应用,该系统基于GPS同步时钟原理,以MAX125为数据采集芯片,W77E58单片机为控制器,采用两片双口RAM,通过ISA总线与PC机进行数据交换。
关键词 电力系统 MAXl25 14同步数据采集系统 单片机 PC机 ISA总线
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数字锁相法实现位同步 被引量:3
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作者 殷明 《河海大学常州分校学报》 2001年第3期15-19,共5页
论述了数字锁相法位同步的原理 ,并提出了一种简单、有效的位同步系统实际电路 .
关键词 同步 控制门 数字通信 数字锁相法 位同步系统 定时系统 电路设计
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一种自适应GPS位同步方式 被引量:2
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作者 张丹 谭惠轩 《电子技术与软件工程》 2014年第5期54-55,共2页
文章对目前常用的几种典型GPS位同步算法进行了介绍、比较和对比,尽管这几种算法都可以有效实现同步,但是都没有解决强弱信号自适应的问题。为此,文章提出了一种改进的位同步算法,该算法考虑了信号与噪声的幅度关系,基于此进行了自适应... 文章对目前常用的几种典型GPS位同步算法进行了介绍、比较和对比,尽管这几种算法都可以有效实现同步,但是都没有解决强弱信号自适应的问题。为此,文章提出了一种改进的位同步算法,该算法考虑了信号与噪声的幅度关系,基于此进行了自适应门限处理,进而解决了信号强度适应的问题。最后,文章对新算法进行了仿真验证,结果表明算法可以实现强信号快速同步,弱信号正常同步的设计目的。 展开更多
关键词 GPS同步弱信号全球定系统
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Phase Desynchronization as a Mechanism for Transitions to High—Dimensional Chaos
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作者 ZHENGZhi-Gang HUGang 《Communications in Theoretical Physics》 SCIE CAS CSCD 2001年第6期682-688,共7页
Phase is an important degree of freedom in studies of chaotic oscillations. Phase coherence and localization in coupled chaotic elements are studied. It is shown that phase desynchronization is a key mechanism respons... Phase is an important degree of freedom in studies of chaotic oscillations. Phase coherence and localization in coupled chaotic elements are studied. It is shown that phase desynchronization is a key mechanism responsible for the transitions from low- to high-dimensional chaos. The route from low-dimensional chaos to high-dimensional toroidal chaos is accompanied by a cascade of phase desynchronizations. Phase synchronization tree is adopted to exhibit the entrainment process. This bifurcation tree implies an intrinsic cascade of order embedded in irregular motions. 展开更多
关键词 phase synchronization phase localization Lyapunov exponents
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Measure Synchronization on Symplectic Map
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作者 CHENShao-Ying XUHai-Bo +1 位作者 WANGGuang-Rui CHENShi-Gang 《Communications in Theoretical Physics》 SCIE CAS CSCD 2004年第6期886-894,共9页
Measure synchronization in coupled Hamiltonian systems is a novel synchronization phenomenon. The measure synchronization on symplectic map is observed numerically, for identical coupled systems with different paramet... Measure synchronization in coupled Hamiltonian systems is a novel synchronization phenomenon. The measure synchronization on symplectic map is observed numerically, for identical coupled systems with different parameters. We have found the properties of the characteristic frequency and the amplitude of phase locking in regular motion when the measure synchronization of coupled systems is obtained. The relations between the change of the largest Lyapunov exponent and the course of phase desynchronization are also discussed in coupled systems, some useful results are obtained. A new approach is proposed for describing the measure synchronization of coupled systems numerically,which is advantage in judging the measure synchronization, especially for the coupled systems in nonregular region. 展开更多
关键词 symplectic map measure synchronization phase locking Lyapunov exponent
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Novel Method for Optimal Location of STATCOM in Distribution Systems Using Sensitivity Analysis by DIgSILENT Software
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作者 Abouzar Samimi Masoud Aliakbar Golkar 《Journal of Energy and Power Engineering》 2012年第7期1170-1176,共7页
In this paper a new method has been proposed to decide optimal placement and best sizing of STATCOM (static synchronous compensator). The best place of STATCOM is found using the sensitivity analysis and optimum siz... In this paper a new method has been proposed to decide optimal placement and best sizing of STATCOM (static synchronous compensator). The best place of STATCOM is found using the sensitivity analysis and optimum sizing of STATCOM is managed using the genetic algorithm. The average model can account for the high-frequency effects and power electronic losses, and more accurately predict the active and reactive power outputs of the STATCOM. This paper employs the DIgSILENT simulator and DPL (DIgSILENT programming language) as a programming tool of the DIgSILENT to show the validity of the proposed method. The effectiveness of suggested approach has been tested on part of the distribution network of Iran, Khoramdarreh city in Zanjan province. 展开更多
关键词 Average model optimal placement genetic algorithm sensitivity analysis STATCOM.
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COMPASS time synchronization and dissemination—Toward centimetre positioning accuracy 被引量:9
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作者 WANG ZhengBo ZHAO Lu +3 位作者 WANG ShiGuang ZHANG JianWei WANG Bo WANG LiJun 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS 2014年第9期1788-1804,共17页
In this paper we investigate methods to achieve highly accurate time synchronization among the satellites of the COMPASS global navigation satellite system(GNSS).Owing to the special design of COMPASS which implements... In this paper we investigate methods to achieve highly accurate time synchronization among the satellites of the COMPASS global navigation satellite system(GNSS).Owing to the special design of COMPASS which implements several geo-stationary satellites(GEO),time synchronization can be highly accurate via microwave links between ground stations to the GEO satellites.Serving as space-borne relay stations,the GEO satellites can further disseminate time and frequency signals to other satellites such as the inclined geo-synchronous(IGSO)and mid-earth orbit(MEO)satellites within the system.It is shown that,because of the accuracy in clock synchronization,the theoretical accuracy of COMPASS positioning and navigation will surpass that of the GPS.In addition,the COMPASS system can function with its entire positioning,navigation,and time-dissemination services even without the ground link,thus making it much more robust and secure.We further show that time dissemination using the COMPASS-GEO satellites to earth-fixed stations can achieve very high accuracy,to reach 100 ps in time dissemination and 3 cm in positioning accuracy,respectively.In this paper,we also analyze two feasible synchronization plans.All special and general relativistic effects related to COMPASS clocks frequency and time shifts are given.We conclude that COMPASS can reach centimeter-level positioning accuracy and discuss potential applications. 展开更多
关键词 GNSS time and frequency Global Navigation Satellite System GNSS time synchronization time dissemination atomic clock phase locked loop RELATIVITY Geo-stationary satellites reference system
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