low-frequency interference 中文意思是什麼

low-frequency interference 解釋
低頻干擾
  • low : adj 1 低的；淺的，矮的。 low flight 低飛。 a low temperature 低溫。 low tide [water] 低潮。 The g...
  • 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。
  • interference : n. 1. 沖突，抵觸。2. 干涉，干預。3. 妨礙，打擾，阻礙物。4. 【物理學】干擾；干涉。
  1. Design engineers now selecting pmbldc motors over conventional dc or induction motor drives for the following reasons : 1 ) the absence of brushes results in an essentially maintenance free operation and eliminates the undesirable effects of commutation such as sparks, brush - loss, radio - frequency interference, etc. 2 ) the low inertia of the rotor enhances the quality of the mechanical response of the motor, shortening the acceleration and deceleration time. 3 ) utilizing rare - earth permanent magnet materials with high coercive force results in substantially higher efficiency than their counterpart with brushes of the same size. 4 ) because of the absence of commutation segments, the stator construction is simple

    現在的工程師們更為青睞永磁無刷直流電動機是因為以下幾點原因： （ 1 ）去除了電刷的永磁無刷直流電動機徹底地免除了維護而且消除了我們不希望的由於換向帶來的火花、電刷損耗以及無線電干擾等等； （ 2 ）低轉動慣量的轉子提高了電機機械響應的質量，從而縮短了電機加速和減速的時間； （ 3 ）高矯頑力稀土永磁材料的使用使得同樣尺寸的永磁無刷直流電動機比傳統的直流電動機效率高； （ 4 ）由於沒有機械換向部分定子的結構簡單了。
  2. On the basis of practically achieved low - frequency laser - vibration measuring - system, this thesis analyses the principle of laser - vibration measuring - system, the optical factors which have effect on contrast degree of interference fringe, the optical - electric transformation factors which have effect on measuring accuracy, the important of filter for improving the accuracy in the absolute calibration and the outward vibration which has effect on system accuracy, etc. in chapter one, the background of laser measuring vibration, and then followed by its current status, is introduced and analyzed

    本論文根據實際研製的激光測振儀系統，從提高激光測振儀精度的角度出發介紹了激光測振儀的原理，並詳細地剖析了光路對測振儀干涉條紋對比度的影響、光電轉換對測量精度的影響、光電信號的濾波放大以及外界振動對測振儀系統的影響等技術問題。
  3. The content of this theme is as follows : without time, without open, without stopping railway transport, and without interrupting traction current of block tested, meanwhile track circuit parameters in electrical and no electrical blocks is measured of on - line, dynamic and real - time. these parameters include voltage of fsk signal, voltage of industrial and harmonic wave interference, upper frequency, lower frequency, carrier frequency and low frequency 18 messages frequency

    本課題研究內容：在不要點，不開天窗，不中斷行車，不中斷被測區段牽引電流的情況下，在線、動態、實時測量電化區段和非電化區段的移頻信號電壓、工頻干擾電壓，移頻信號（調頻信號）的上邊頻、下邊頻、載波頻率、以及低頻18信息頻率等參數。
  4. Cdma ( code division multiple access ) is a promising technology for future mobile communication system because of its several features with which other multiple access technology can not compare : higher efficiency of frequency allocation, robust anti - multipath effect, macro diversity, mitigating interference, soft capacity, low power, soft handoff, simple frequency design, easy access, and so on

    碼分多址接入（ cdma : codedivisionmultipleaccess ）方式以頻譜利用率高、抗多徑、抗干擾、軟容量、低功率、軟切換、宏分集、頻率規劃簡單、用戶接入方便等其它多址技術不可比擬的優越性被認為是未來移動通信系統的理想接入技術之一。
  5. With the characteristics of large ambient noise, very narrow bandwidth, low carrier frequency, great propagation latency and time - space - frequency variant multipath effect ( mpe ), the stochastic ocean channel has demonstrated the greatest complexity and difficulty for underwater acoustic wireless communications. among them multipath effect ( mpe ) is the most difficult obstacle that results in signal fading and inter - symbol interference ( isi )

    但是噪聲高、帶寬窄、載波頻率低、傳輸時延大、多途徑效應隨時間?空間?頻率變化等通道特性都會給有效、可靠的水聲通信帶來很大的麻煩，其中多途徑效應是最主要的困擾因素，它會導致信號幅度衰落和碼間干擾。
  6. In this thesis, the general error sources for psi are analyzed. we find that the relatively low - frequency vibrations at 50hz and lower are the main problem through the analysis of the vibration sources in usual environment. a new vibration compensation method, phase modulating interference fringes fractionizing technology, has been put forward in a creative way

    本文分析了干涉測量技術中存在的主要誤差來源，通過對通常環境下振源特性的分析，得到了對干涉測試影響較大的振源的頻率范圍主要在30hz以下，確定了抗振補償的目標和技術指標是使干涉儀的振動頻率50hz ，振幅1 m 。
  7. In the course of exploiting the system hardware, we adopt the low frequency sine wave excitation technology whose frequency is alterable, and scheme out the new signal conversion & amplifying circuit, the new lcd circuit and the new system anti - interference circuit

    在系統硬體電路的開發中，我們採用了頻率可調的低頻正弦波勵磁技術，並設計出新穎的信號轉換放大電路、液晶顯示電路和系統抗干擾電路。
  8. The technology of very low bit rate for hf ( high frequency ) communication means that, one technology of ecm ( electronic counter measures ) resistant communication is developed for low bit data message exchange in the time of battle which data communication is destroyed by electronic disturber. it is regarded by armies in the battle of information, because that it can overcome the very low snr ( signal noise ratio ), very high narrow - band interference and multipath with maxium delay of fifty millisecond

    短波最低限度通信技術是在戰時強電磁干擾情況下能實現保證最低限度的數據報通信的一種抗干擾通信技術。由於其能有效的克服極低信噪比、較強的窄帶干擾和幾十毫秒的多徑，在信息戰中受到各軍高度重視。
  9. Cdma is a promising technology for future mobile communication system because of its several features with which other multiple access technology can not compare : higher efficiency of frequency allocation, robust anti - multipath effect, macro diversity, mitigating interference, soft capacity, low power, soft handoff, simple frequency design, easy access and so on

    方案二從獨立分量分析與傳統盲多用戶檢測器的結合性上考慮，即用一種子空間mmse檢測演算法的輸出來初始化ica演算法的權向量，進而利用修正fastica分離演算法對其進行迭代直至滿足要求。
  10. The problem of signal processing for direct - sequence code - division - multiple - access ( ds - cdma ) signal over multipath frequency - selective mobile channels is considered. a new blind receiver is proposed. without the knowledge of the multiple - access interference users spreading code and the channel characteristics, the receiver achieves blind detection with prior knowledge of only the desired users spreading code and approximate timing. by using reduced rank adaptive decorrelating filter and adaptive multipath combiner which is based on decision - directed algorithm, the receiver gets the ability to combat both fading and the near - far effect at low cost. simulation results demonstrate that the proposed receiver offers high performance

    本文研究多徑頻率選擇性衰落通道下直接序列擴頻碼分多址（ ds - cdma ）信號的處理問題，提出了一種新型的盲接收機.該接收機不需預知多址干擾用戶的擴頻碼，不需預知通道參數，只需已知期望用戶的擴頻碼和粗略的定時，就可以完成用戶的盲檢測.同時，該接收機通過降維自適應去相關濾波和基於判決指導的自適應多徑合併，來獲得低成本和良好的抗衰落、抗遠近效應性能.模擬結果驗證了本文提出的接收機的優良性能
  11. That is by inserting known symbols or pilots in time and frequency domain to estimate the channel frequency response. the proposed method employs iterative low - pass filtering in transform domain which can reduce additive white gaussian noise and inter - carrier interference effectively

    該估計演算法採用在變換域多次迭代濾波的方式，能夠顯著降低高斯噪聲和載波間干擾（ ici ）對估計性能的影響，同時快速fft演算法也使得變換域濾波變得比較簡便。
  12. Before now because operating frequency was low, suppose that electrode in saw device has no thickness and thus second order effects are ignored. these second order effects, including electromagnetic feedthrough, triple transit interference, body acoustic wave, reflection and so on, affect the performance of saw device in high frequency. so it is important that second order effects are researched and improved in depth

    這樣的需求要求了saw設計者考慮在低頻時未加考慮的二階效應，大多數以前的分析假設電極無厚度而忽略了的二階效應（電磁直通、三次行程干擾、體聲波、聲電再生等）在高頻時對saw器件的性能影響較大，要求對其二階效應進行深入研究並對其進行改善。
  13. Heavy interference ， changeable variables and load are the characteristics of film supply system and film receipt system. resolutions for these problems are emphasized in this paper. as usual, the effective method to solve the heavy interference in low frequency and the changeable load is compound control for disturbance compensation

    供片、收片張力伺服系統具有變參數、變負載、強擾動的技術特點，解決這些問題是本論文的重點內容。通常情況下，在解決低頻強擾動、變負載問題方面，最有效的方法是採用按擾動補償的復合校正方式。
  14. Now the development in radio communication system and sensors productively need saw devices of high performance and high frequency. but electromagnetic interference of saw device is evident day and day. so the saw device technologies of the electromagnetic interference and electromagnetic compatibility in its process of design, fabrication and production must be considered. the demand request saw designer of second order effects which are not considered in low frequency

    當前在無線通信系統和傳感器方面的進展預示了需要高性能、高頻的saw器件，但是隨著其工作頻率的提高， saw器件電磁干擾問題日益突出，因此saw其電磁兼容技術在設計、研製和生產過程中是必須考慮的。
  15. The studies show that compared with the conventional logarithmic decrement method, this method need not to determine the baseline, and is insensitive to baseline drift and low frequency interference

    研究表明，與傳統的對數衰減法相比，新方法無須確定基線，估計結果對基線漂移和低頻干擾不敏感。
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