quadrature signal 中文意思是什麼

quadrature signal 解釋
正交信號
  • 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。
  • signal : n 1 信號，暗號；信號器。2 動機，導火線 （for）。3 預兆，徵象。adj 1 暗號的，作信號用的。2 顯著的...
  1. 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。
  2. When the cur - cuit resets, the chip remains accepting state, works in burst mode, and adopts dpsk modulation mode. it proceeds quadrature - sampled intermediate frequency signal after the ad9057 has converted, then down - converses, despreads and demodulates. the demodulated baseband signal will be sended into scm to dispose through interrupt

    上電復位后，晶元處于接收狀態，工作在突發模式下，採用dpsk調制方式，將ad9057轉換完的中頻信號進行復正交取樣後下變頻、解擴、解調，通過中斷將解調完的基帶信號送入單片機處理；處于發送狀態時，可將數據擴頻、調制，經ad9768送出。
  3. Realization of quadrature coherent detection by direct sampling of if signal

    直接中頻采樣實現正交相干檢波的研究
  4. Presents the development of modern signal processing techniques, a new implementation method which realizes quadrature coherent detection by direct sampling of if signal generated during the implementation of traditional quadrature coherent detection with analog elements in the form of two parallel baseband channels where in phase ( i ) and quadrature ( q ) components of ceived if singnal where, the imperfect matching of the separate channels due to the analog elements results in high phase and amplitude which meets the needs for high performance radar signal processing, the elementary principles and the implementation process for each method and concludes from simulation results to compare their features and application conditions that the new approach can satisfy of the requirements of high performance sp

    針對近年來提出的通過直接中頻采樣來實現正交相干檢波的方法，分析了其基本實現原理，並用統一的觀點解釋了迄今為止國內外基於此提出的各種實現方法；對每一實現方法的基本原理和實現過程都作了分析，並給出了計算機模擬結果；在此基礎上比較了各方法的性能指標及適應條件.理論分析和模擬結果證明，這一方法完全可以滿足高性能信號處理的要求
  5. 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。
  6. Analyze, design and simulate the digital down - convert frequency. first, the analogue if signal is converted to digital if signal in one a / d convertor which used passband sampling theory. the digital if signal is then passed to a pair of digital mixers operating in phase quadrature for mixing the if signal to baseband signal

    首先利用帶通采樣定理對中頻模擬信號進行a / d變換后將其混頻到基帶，然後用平方根升餘弦滾降濾波器同時完成低通濾波和匹配濾波雙重作用，以提高解調器的效率。
  7. 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。
  8. Quartered demodulating technology is widely applied in modern if receiver because it can extract phase and amplitude information from the received signal. the quadrature demodulating component in traditional receiver was implemented with analog circuits

    在現代雷達系統中，寬帶雷達信號應用的越來越廣泛，相應地，通過數字信號處理的方法來處理超寬帶雷達信號，需要高速的數據採集系統來提取信息。
  9. 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。
  10. Extraction of the in - pulse characteristics of signal based on direct sampling from if signal and quadrature coherent detection

    基於中頻直接采樣正交相干檢波技術的信號脈內特徵提取
  11. It produces the i and q signals, limits their pass bands, uses them to modulate the subcarrier in a quadrature and adds the moduled subcarrier to the luminance y, blanking and synchronizing signal waveform

    它首先分離出i信號和q信號，指定了它們的傳輸頻帶，並用它們對副載波進行正交調制，然後將調制過的副載波信號疊加到亮度信號y和同步信號波形上。
  12. 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 。
  13. Then, digital quadrature envelope detection is used to detect the envelope of ultrasound as it is most used in the corresponding signal process. at last, we transform the signal to the range which can be displayed by the logarithm transform

    有效補償了超聲傳播過程中的吸收衰減;並將正交包絡檢波技術用於超聲信號的幅度檢測;最後通過對數壓縮得到了顯示需要的灰階信號。
  14. The digital quadrature sampling theorem for bandpass signal and its optimum design

    帶通信號的數字正交采樣定理及優化設計
  15. Software radio which promises well needs a kind of wideband high speed and resolution adc, but at present it is hard to realize. on the basis of the theory of multirate signal processing, the theory of filters, bandpass sampling theorem and adc principium, perfect reconstruction quadrature mirror filter ( prqmf ) banks adc system is proposed

    基於此背景，本文在融合多速率數字信號處理理論、濾波器理論、帶通采樣定理以及adc原理的基礎上，提出了prqmf濾波器組adc系統，並對該adc系統的原理、結構、特性進行了探討和研究，其主要結論和創新之處如下： 1
  16. 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。
  17. If we can prepare a mode of the electromagnetic field in an appropriately squeezed state, it will allow one to tune the signal - noise ratios of its quadrature components : one of the quadratures can be used to absorb the inevitable quantum - mechanical " noise ", while the other one serves to transmit an extremely well - defined signal

    如果將電磁場的某一個模式制備在壓縮態，那麼就可以調節信噪比，使得一個正交分量可以用來吸收不可避免的量子力學噪聲，另一個正交分量用來很好的傳遞信號。那麼在量子電磁場中當系統的一些模式被制備在壓縮態時，就很有必要研究場的腔性質了。
  18. 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。
  19. Based on the components of analogue receivers, all kinds of influences on the signal from all kinds of components are given, then the influences on the result of pulse compression from the quadrature demodulators is focused on

    接著分析各個模擬接收機組件對回波信號產生的各種幅相誤差，這些誤差會對信號頻譜和脈壓結果產生影響，並重點分析正交解調幅相誤差對它們的影響。
  20. According the standard of digital video broadcasting for cable channel, this paper analyze, design and simulate a all - digital demodulator that receive high rate quadrature amplitude modulate ( qam ) signal in order to making the demodulator chip for qam signal that transmitted through the channel of cable television. the paper includes some contents as follows

    本文依照dvb - c傳輸標準，為了製作數字有線電視接收機中的正交振幅調制（ qam ）信號的全數字解調晶元，對qam信號的全數字解調器進行了分析、設計和模擬，主要包括以下內容：對數字下變頻進行了分析、設計和模擬。
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