pulse position modulation system 中文意思是什麼

pulse position modulation system 解釋
脈位調制系統
  • pulse : n 1 脈搏；有節奏的跳動；【動物；動物學】脈沖（波）；脈動。2 意向；傾向。3 【音樂】拍子，律動。vi ...
  • position : n 1 位置；方位；地點。2 處境，情況；狀態，形勢，局面。3 姿態，姿勢。4 地位，身份；職位；職務。5 ...
  • modulation : n 調整，調節；（聲調的）抑揚，變化；【音樂】轉調，變調；【無線電】調制。 amplitude modulation 振...
  • system : n 1 體系，系統；分類法；組織；設備，裝置。2 方式；方法；作業方法。3 制度；主義。4 次序，規律。5 ...
  1. A closed pulse width modulation ( pwm ) regulating speed system for dc servo - motor is presented, it is composed of avr microcontroller, pwm power driver, unit of speed detection using encoder and a serial communication interface, etc. fuzzy pid algorithm is employed to control the speed and position of wmr. the method can solve effectively some problems such as the uncertainty of wmr ' s model, the varieties demand, the change of situation

    其次，設計了基於avr微控制器（ at90s8515 ）的移動控制系統，其中主要包括pwm功率驅動、測速單元和串列通訊模塊等：對機器人速度、位置控制採用模糊pid演算法，較好地克服了移動機器人模型的不確定性、轉速位置控制要求的多變和環境改變等因素的影響。
  2. 2. applying manchester coding theory to meet the end of collision detection and codes judgment effectively. 3. using pulse position modulation ( ppm ) coding theory that is invented especially for optical communication in the air to ameliorate the system ' s performance by improving the system ' s character of pe. 4. taking good advantages of the fledged lan communication protocols and technologies to achieve a new method that has a high rate of capability to cost in building a wireless lan

    論文研究中主要的創新性工作如下： 1 、提出利用光散射通信技術組建無線局域網，方便地實現了廉價而高速的局域網內微機的光互連； 2 、採用曼徹斯特編碼技術解決了光無線通信中代碼判決和碰撞檢測的技術難題； 3 、針對空氣通道的特點，利用ppm編碼技術降低通道誤碼率、改善系統性能； 4 、在光無線局域網中利用現有的成熟有線局域網協議和技術，從而保證了系統的實用性及改善了系統的性價比。
  3. The paper contains all kinds of knowledge related to the system, including maxwell electromagnetic theory, pattern of optical radiation in space, channel model of atmosphere communication, computer communication protocols, wireless lan communication protocols, medium access control protocol, carrier sense multiple access / collision detection protocol, manchester coding theory, pulse position modulation coding theory and so on

    主要包括： maxwell電磁理論；發送光場模型；空間通道模型；計算機網路通信技術：無線局域網通信技術；媒體訪問控制規程（ mac ） ；載波檢測多址接入碰撞檢測規程（ csma cd ） ；曼徹斯特編碼與ppm編碼技術等。
  4. Then we introduce pulse position modulation ( ppm ) using pn code and analysis its multi - access performance, system capacity and power spectrum density. on the basis of those analyses, we study the pulse shape and the anti - jamming ability of the system. at last, multiple access with pseudochaotic time hopping is introduce

    本文首先闡述了uwb脈沖通信系統的基本原理，重點介紹了用偽隨機碼跳時的ppm （脈沖位置調制）調制，分析了他的多址性能、系統容量和功率譜密度，在此基礎上研究了改進性能的發射信號形狀和系統抗干擾能力，最後介紹了偽混沌碼跳時的多址方式。
  5. By introducing oppm ( overlap pulse position modulation ), the system ' s performances are improved also. 5 study wireless optical cdma system

    通過引入oppm （重疊脈沖脈位調制）方式，進一步提高了系統的傳輸效率。
  6. Firstly, the basic theory of switch reluctance generator ( srg ) is discussed in detailed, based on the mechanism electric energy converting analysis, non - linear analysis and non - linear simulation. three control methods of srg ( angle position control method, current chopping control method, pulse width modulation control method ) are deeply studied and analyzed. the electronic controller, which controlled by dsp or by hardware circuit are developed for low - power switched reluctance generation system

    首先系統地研究了開關磁阻電機發電運行的基本理論，從機電能量變換的角度分析開關磁阻發電機的機電能量變化規律；通過非線性分析和非線性模擬方法，明晰開關磁阻電機發電本質，概括出開關磁阻電機發電運行的特點；系統、深入地研究了開關磁阻電機發電運行的控制方案（角度位置控制、電流斬波控制、脈寬調制控制） 。
  7. The system has a good security and can prevent the pervasion of mistake code, has a well anti - jamming ability and so on. some substantial and groping work has been done in the process of using chaos security communication in pulse wireless system and the multi - access communication of chaotic pulse position modulation

    系統具有很高的保密性，具有防誤碼擴散，抗干擾能力強等特點，同時也為混沌保密通信應用於脈沖無線電系統以及混沌脈沖位置調制的多址通信方面做了一些實質性和探索性的工作。
  8. The proposed control system includes the attitude controller acting on the rigid hub, designed by using pulse - width pulse - frequency ( pwpf ) modulation integrated with command shaping technique based on csvs method, and the piezoelectric material elements as sensors / actuators bonded on the surface of the beam appendages, designed by the optimal positive position feedback ( oppf ) control technique, in which the selection of ppf gains is determined via introducing a cost function to be minimized by feedback gains which are subject to the stability criterion at the

    設計的控制器僅利用輸出信息，從而避免設計撓性模態狀態觀測器以及引入狀態觀測器誤差;在此基礎上，採用分力合成方法設計命令成形控制器來抑制撓性附件的振動，設計的優化命令成形控制信號在理論上可以對系統的各階撓性模態完全抑制。但考慮到模型不確定性和外部擾動，在內迴路又設計了最優正位置反饋（ oppf ）補償器以增加撓性結構的阻尼，使撓性結構的振動能夠很快衰減。
  9. This system realize the chaos arithmetic directly by hardware and non - chaos synchronization communication by chaotic pulse position modulation technology

    該系統直接用硬體實現混沌迭代演算法，運用混沌脈沖位置調制技術實現無混沌同步通信。
  10. Chapter is the most important part in this paper, we used pulse position modulation ( ppm ) and maxim - likelihood demodulation to increase the power efficiency, improve the ber, also we used rs ( reed - solomon ) code to correct the bunched bit error because of the atmosphere scintillation. with the ppm modulation / ml demodulation method and rs code, the performance of the system improved to a new stage

    第四章是對無線光接入的調制解調和編碼技術的分析，也是本文的重點，比較了ppm調制和ook調制的帶寬和功率利用率、硬判決解調和最大似然解調對系統性能的改善，以及採用rs糾錯碼對系統性能的改善。
  11. Based on the theory of nonlinear dynamics system, this paper discusses the theory about wireless chaos security communications and its history and status quo of development, then emphasizes the new communication technology - chaotic pulse position modulation, and the realization of non - chaos synchronization wireless security communication system using the technology

    本文以非線性動力學系統理論為基礎，論述了無線混沌保密通信的相關理論及發展歷史和現狀，並著重講述了混沌脈沖位置調制（ chaoticpulsepositionmodulation ）這一新穎的通信技術，和利用此技術實現的無混沌同步的無線保密通信系統。
  12. Uast is equipped with the complex radar system of both continuous wave pseudorandom code phase modulation and mono - pulse amplitude comparison ( crs ), and crs measures and gets target ' s position information

    在坦克超近反導系統中，裝備偽碼調相連續波與單脈沖幅度比較復合體制雷達，用於測量目標的位置信息。
  13. This system based on logisitic map. it designs a chaos sequence generator and realizes the modulation and demodulation of chaotic pulse position by hardware

    本系統基於logistic映射，構造混沌序列發生器，用硬體演算法實現混沌脈沖位置的調制和解調。
  14. In the design of real - time control system, the paper takes three - phase full - bridge mosfet inverter as the real - time control main circuit, and adopts a control scheme with 120 ? switching mode combined with half - bridge pulse width modulation ( pwm ), which would avoid straightthrough short of a certain bridge. phase current is detected by single current sensor ; three - phase position signals generated by position sensors could not only supply commutation information for inverter, but also be used for speed detecting based on signals " period measurement, which makes the speed sensor unnecessary. the whole control system adopts speed and current dual closed - loop control strategy in order to construct a high performance rare - earth permanent magnetic brushless dc motor ( repm bldcm ) full - digital real - time control system

    在實時控制系統的設計中，本文以三相全橋mosfet逆變電路作為實時控制主電路，採用120導通方式結合半橋pwm調制的控制方案，從而有效地避免了橋臂的直通短路；本文用單電流傳感器實現對相電流的檢測，來自位置傳感器的三相位置信號不僅為逆變電路提供換相信息，而且也用於基於信號周期測量的轉速檢測，這樣就省去了速度傳感器；系統採用的是速度、電流雙閉環控制策略，力求構建高性能的稀土永磁無刷直流電動機全數字實時控制系統。
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