quadrature demodulation 中文意思是什麼

quadrature demodulation 解釋
正交解調
  • quadrature : n. 1. 【數學】求積分，求面積。2. 【天文學】矩；（月的）上[下]弦；方照。3. 【物理學】正交；轉象差；九十度相位差。
  • demodulation : n. 【無線電】解調，反調制；檢波。
  1. Research the digital quadrature demodulation

    數字解調技術及其實現。
  2. In the thesis, a signal processing scheme of polarization - insensitive fiber optic michelson interferometric magnetic sensor is described : making the interferometer work near the quadrature with closed loop controlling working point method, the fundamental frequency component of the magnetic field sensing signals can be detected to measure the input direct current ( dc ) magnetic field by phase sensitive demodulation

    本文主要介紹了偏振無關光纖michelson干涉型微弱磁場傳感器信號處理的方案:通過閉環控制工作點演算法使干涉儀工作在正交工作點處，再利用相敏檢波演算法提取傳感器輸出信號的基頻分量，以測量直流磁場的大小。
  3. This thesis discusses the pulse doppler ( pd ) weather radar signal processing system including digital intermediate frequency ( if ) receiver, especially on the application of if sampling and digital demodulation technique in pd weather radar signal processing system, the influence of amplitude and phase unbalances of in - phase and quadrature channels on weather radar echo spectrum estimation, ground clutters elimination algorithms and a typical engineering realization scheme of pd weather radar signal processing system

    本論文研究的是採用數字中頻接收技術的脈沖多普勒氣象雷達信號處理系統，重點研究了中頻采樣及數字解調技術在脈沖多普勒氣象雷達信號處理系統中的應用、正交雙通道幅相不平衡對氣象回波譜估計的影響、地雜波濾波演算法，以及脈沖多普勒氣象雷達信號處理系統的具體工程實現。
  4. This dissertation adopts a universal digital ds / dmpsk modulation and demodulation scheme which is based on fpga. this scheme adopts quadrature balanceable modulation, intermediate frequency sampling, digital matched filtering, delay differential demodulation techniques and so on. it directly processes the digital signals on intermediate frequency without down - conversion, and doesn ’ t need pseudo random codes synchronization and carrier wave extraction circuits

    本文採用了一種基於fpga的通用數字調制解調方案，該方案在調制端採用了正交平衡調制技術，在解調端採用了中頻帶通采樣、數字匹配濾波、延時差分解調等技術，直接在中頻上進行數字信號處理，不需要進行下變頻，也不需要增加額外的偽隨機碼同步捕獲和載波提取電路。
  5. The theoretic analysis and computer simulation results reveal that this influence ca n ' t be ignored. because the if sampling and digital demodulation technique can improve amplitude and phase unbalances of in - phase and quadrature channels, we apply it in the pd weather radar signal processing system and select several digital demodulation algorithms, which are easier to implement, for this system

    由於採用中頻采樣和數字解調技術能有效地提高正交解調兩路的幅相一致性，本文將中頻采樣及數字解調技術應用到脈沖多普勒氣象雷達信號處理系統中，並結合氣象信號的特點選擇了適合工程實現的中頻采樣及數字解調演算法。
  6. A real time method for the calibration of the quadrature demodulation error of the rcs measurement radar receiver is proposed

    摘要針對脈間變頻rcs測量雷達採用模擬正交解調方法獲得同相分量和正交分量所引入的解調誤差，提出了一種實時校準方法。
  7. The method based on quadrature demodulation is studied and the equations used to calculate the frequency, magnitude and phase ( difference ) of signals are given. the author has designed two kinds of low pass filters ( lpfs ) and has studied two kinds of frequency - tracking methods

    研究基於正交解調的科里奧利質量流量計信號處理方法，給出了同時求出信號的頻率、幅值和相位（差）的公式，設計兩種濾波器，研究兩種跟蹤方法，並進行模擬和比較，得到較好的方案。
  8. This thesis begins with hfc network theory and docsis, analyses modulation / demodulation process of data communication in hfc. then, several theories are analysed including qam ( quadrature amplitude modulation ), nyquist root square filter, fec ( forward error correction ), map ( bandwidth allocation map ). and digital signal transmission involved the other important international standard ? itu - t j. 83 annex a / b, is discussed

    本文從hfc網路理論和docsis協議入手，分析了hfc數據通信的調制解調過程，對qam調制、奈奎斯特均方根濾波器、前向糾錯（ forwarderrorcorrection ，簡稱fec ） 、 map通信等進行了闡述；還從中探討了電纜數據機需要用到的另一個國際標準ituj . 83annexa / b所設計的mpeg信號的數字傳輸。
  9. This project study the all - digital modulation and demodulation of / 4 offset differentially encoded quadrature phase shift keying ( / 4 - dqpsk ). then use / 4 - dqpsk digital modulation and baseband differential demodulation technology to implement digital signal transmission. the bite rate is 500kb / s and the intermediate frequency is 2mhz

    本課題對/ 4 - dqpsk的全數字調制解調技術進行研究，利用/ 4 - dqpsk數字調制和基帶差分解調技術實現數字信號的傳輸，實現傳輸碼率500kbps ，調制中頻2mhz 。
  10. Through the analysis of advantages of several gmsk arithmetic and requirement of system processing, the base - band time lag demodulating algorithm based on quadrature demodulation and tms320vc5402 are selected for base - band processing

    通過分析gmsk幾種演算法的優越性以及系統對處理的需求，選擇基於正交解調的基帶時延檢波演算法以及tms320vc5402進行基帶處理。
  11. On the basis of our lab ' s previous achievements, the author has studied three kinds of digital signal processing methods - the method based on a digital phase locked loop, the method based on quadrature demodulation, and the method based on adaptive funnel filter ( aff ) and sliding goertzel algo rithm ( sga ). the author has also studied the cmf driving principle, various analog driving circuits, driving waves, and digital driving methods

    主要研究了三種科氏流量計的數字信號處理方法：基於數字鎖相環的方法、基於正交解調的方法和基於自適應funnel濾波器和滑動goertzel演算法的方法；以及科氏流量計驅動的原理、各種模擬驅動的波形、電路以及數字驅動的方法等。
  12. The application of digital quadrature demodulation in wireless saw sensor systems

    數字正交檢波技術在無線聲表面波傳感器系統中應用
  13. The main contents of this paper include : the theory of if digitization ( sampling, quantization, quadrature demodulation and multi - rate digital signal processing ), the simulation of the system project, the design and implementation of the ddc part and introduction of the main devices applied in it

    本文的主要內容包括：中頻數字化理論（采樣，量化，正交解調，多相濾波結構以及fir濾波器的設計等） 、系統方案論證及模擬、數字下變頻部分的硬體實現、系統調試及結果分析以及系統採用的主要器件介紹等。
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