frequency modulation system 中文意思是什麼

frequency modulation system 解釋
調頻系統
  • frequency : n. 1. 屢次，頻仍，頻繁。2. （脈搏等的）次數，出現率；頻度；【物理學】頻率，周率。
  • 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. On the base of researching the theory of the scheme and analyzing the signal feature, it is obtained that the existence manners and character of distance information in the differential frequency signal. at the same time, a new conclusion is gained that the technology of frequency agility can decrease the constant error of system. it is also to say that frequency agility and frequency modulation fixed - distance fuze has the similar feature to random period frequency modulation fixed - distance fuze. according to the theory of address coding in the hopping - frequency communication, the paper presents the principle of selecting the frequency agility sequence which fit to the radio fuze and constructs the frequency agility sequence family based on the rs codes

    在深入研究方案原理和分析信號特徵的基礎上，獲得了該體制引信差頻信號中，距離信息的存在形式和特點，得出了頻率捷變技術的引入降低了系統定距固定誤差這一新的結論，即頻率捷變調頻定距引信在定距性能上具有類似隨機周期調頻定距的特徵。本文引入跳頻通信地址編碼理論，結合無線電引信的具體特徵，提出了適用於無線電引信的頻率捷變序列的選擇原則，並構造了基於rs碼的寬間隔頻率捷變序列族。
  2. Pulse frequency modulation control system

    脈沖調頻控制系統
  3. The pulse code modulation / frequency modulation ( pcm / fm ) is widely used in most reentry remote sensing ( rrs ) system at the present time in our country

    目前我國再入遙測系統主要採用脈沖編碼調制/調頻（ pcm / fm ）體制。
  4. In this dissertation the pulse compression performances of linear frequency modulation signals ( lfm ), nonlinear frequency modulation signals ( nlfm ) and design of their side - lobes suppression filters are analyzed, and design of the pulse compression program of 4 pieces of adsp21160 in the processing unit and the program of single piece of adsp21160 and fpga in the interface unit of the pulse compression system are introduced in detail

    全文分析了線性調頻信號（ lfm ） ，非線性調頻信號（ nlfm ）的頻域脈沖壓縮方法及其旁瓣抑制濾波器的設計和優化，詳細介紹了脈沖壓縮系統中基於4片adsp21160的處理單元和單片adsp21160和fpga組成的介面單元的軟體設計。
  5. Chapter 2 treats the design of digital phase modulation system in frequency hopping mode communication

    第二章說明了跳頻傳輸模式下數字相位調制系統的設計。
  6. This system can process linear frequency modulation signals ( lfm ), nonlinear frequency modulation signals ( nlfm ) and taylor quadriphase code signals with time width under 42 s and band width under 5mhz. the experimental results demonstrate that the specification characteristics meet the requirements of practical radar systems

    該系統可處理時寬在42 s以內?帶寬在5mhz以下的線性調頻信號（ lfm ） ，非線性調頻信號（ nlfm ）和taylor四相碼信號，且技術指標完全滿足實用系統的設計要求。
  7. Because of the complicacy of the circuit, all sorts of influencing factors, such as power and high frequency modulation etc., are considered to strengthen the harmony and the noise - immunity of the system, while the printed circuit board is designed

    由於電路復雜，在印刷電路板結構設計中，考慮了功率高頻調制等各種因素的影響，以增強系統的協調性和抗干擾性。
  8. The deh system can easily changes the static curve, and makes the transfer from difference to non - difference control. that the pid controller coefficient of deh system can easily adjust according to the experiment make dynamic characteristic better, and can make a brief overopen for good first frequency modulation ability

    Deh系統的調節性能與傳統的調速系統相比有了極大的改善。 deh系統可方便地改變靜態調節特性曲線，並實現無差和有差調節的轉換。
  9. Testing and monitoring device of frequency speed modulation system

    變頻調速系統的測試監控裝置
  10. At the same tune, the paper analyses and discusses the control projects of the above parts. as for the hardware of the control system, on principle of reliability and considering the badly working condition of the vibratory roller, the paper chooses the special controller sp ecializing in the realm of construction machinery ' s control system in order to insure the reliability of the control system and simplify it. about the control quality of the system, the paper establishes the mathematical modes of the frequency modulation system and the amplitude modulation system, analyses the irrationality of the amplitude modulation project, puts forward to apply proportional - integral - differential controller ( pid controller ) to the traveling system and frequency modulation system

    作為控制系統的方案設計的基礎，本文首先對影響壓實效果的振動參數進行了分析；然後針對智能振動壓路機的功能要求，將控制系統分為壓實參數的自動和手動控制、行走控制、轉向和蟹行控制以及智能灑水控制等幾個部分，對各部分的控制方案進行了分析對比和論證；在控制系統硬體設計方面，以可靠性為原則，考慮到振動壓路機的惡劣工況，選擇了專用於工程機械控制領域的專用控制器，使系統的硬體設計得以可靠性保障和簡化；針對控制系統控製品質問題，建立了調頻和調幅系統的控制模型，對調幅系統的控制不合理性進行了分析，提出採用pid控制器對行走和調頻系統進行校正；在軟體設計方面，對各個控制部分進行了軟體編程流程圖設計。
  11. Lfmcw ( linear frequency modulation continuous wave ) radar is a radar system which can get the information of range and velocity through modulating the frequency of continuous wave

    線性調頻連續波（ lfmcw ）雷達是一種通過對連續波進行頻率調制來獲得距離與速度信息的雷達體制。
  12. The experiment result indicates that the circuit system has achieved the expected design goals. furthermore the circuit system is valuable for designing the data acquisition and control system for any frequency modulation sensor

    經實驗驗證，所設計的電路系統不僅能達到預期的設計目標，此外其設計思想對任何只要輸出是頻率信號的傳感器的使用都具有積極的參考價值。
  13. Then, with considering the technical problem that existed in the applying process of the frequency modulation inductance sensor, the integration of the data acquisition circuitry and interface circuitry of this kind of sensor have been studied and the circuitry system with better performance using pld has been developed. at the end of this thesis, the measuring software and some experiments that tests the whole system are introduced

    然後，針對調頻式電感傳感器在過去使用中遇到的技術難題，對該類傳感器數據採集及微機介面電路進行了集成化研究，採用可編程邏輯器件技術設計出了高性能的儀器數據採集及控制系統的硬體電路系統，最後編制了測量軟體且進行了一系列驗證系統性能的測量實驗。
  14. In this paper, the author comprehensively expatiates the research on microwave phase in - lock frequency modulation. at first, the background of reentry telemetry system and the features of pcm telemetry system are presented, and then the author mainly discusses the application of phase in - lock fm techniques in the design of pcm transmitter and the analysis of characteristics of binary pcm reentry telemetry channel

    在文章的前面，作者簡單介紹了目前再入遙測技術發展現狀和pcm系統的特點；然後給出了二元pcm再入遙測通道的系統分析和高碼速率數據傳輸實現的主要途徑；在文章的第三部分，討論了鎖相調頻技術及其在pcm遙測發射機中的實際應用。
  15. Phase modulation system is a superior system, can transmit data at high rate. in this thesis, digital fh - mpsk and fh - / 4dqpsk modulator and demodulator are given according to the frequency - hop communication characteristics. at last, we implement these systems in both hardware and software platform

    本文根據跳頻傳輸的特點，對mpsk和4 - dqpsk這兩種相位調制方式進行分析，提出數字調制解調方案，並用matlab對其進行了模擬，最後還在ti公司的tms320c6416晶元上實現了這兩種系統。
  16. The main results and creative points in the dissertation were as follows : a ) by means of studying on the fiber - optic hydrophones ’ tdm array based on phase generated carrier ( pgc ) demodulation with laser frequency modulation, the mathematic models were set up, used for theoretical analyses of noncoherent crosstalks in the system using low coherent laser and coherent crosstalks in the system using high coherent laser. the formulas calculating crosstalks were given, and the method measuring crosstalks was shown definitely

    本論文的主要研究結果和創新在於: 1 、通過對基於光頻調制pgc （相位生成載波）解調光纖水聽器時分復用系統的研究，針對低相干光源的串擾強度迭加和高相干光源串擾的相干迭加，建立了理論分析的數學模型，得出了計算串擾的公式，明確了測試系統串擾的方法。
  17. This paper realized frequency modulation using the video signal to directly control the resonance loop ' s diode of the vco at the early stages, and then through using radio frequency bipolar junction transistor, designed a lc voltage controlled oscillator which was emulated by advance design system. in addition, it also implemented the design and debugged the hardware circuit

    本文第一次實驗採用視頻信號直接控制vco諧振迴路變容二極體的方式實現頻率調制，並且利用射頻雙極性晶體管（ bjt ）設計了一種lc壓控振蕩器，通過ads軟體進行了參數模擬，最後進行了硬體電路的製作和調試。
  18. Recently, frequency - hop communication has been widely used in many military wireless communication domain as a secure transmission mode. in frequency - hop transmission, phase modulation system has good performance and high frequency efficiency

    跳頻傳輸模式下的數字相位調制系統具有較高的抗噪聲性能，且能有效地利用頻帶，實現數據的高速傳輸，是一種比較優越的調制方式。
  19. Following analyzing the theoretics, the author workouts the control programme using the assembly language and realizes the speed - sensorless frequency modulation system base on f240. this system controls a 1. 1 kw asynchronous motor

    在理論分析的基礎上，利用匯編語言編制了控製程序，並且在f240廣西大學碩士學位論文實驗開發平臺上實現了無速度傳感器變頻調速系統， 。該系統在一臺1
  20. Speed sensor has the limitation of high cost, taking up more space, low reliability and high dependency of working condition. speed - - sensorless frequency modulation system avoids those defects and can meet the need of high performance of ac motor driving which is a stress field

    無速度傳感器變頻調速系統既避免了速度傳感器帶來的成本增加、體積增大、可靠性降低、易受工作環境影響等缺陷，又能夠滿足高性能交流傳動的需要，是運動控制發展的一個重要方向。
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