demodulation techniques 中文意思是什麼
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The demodulation techniques for sagnac interferometer based hydrophone
干涉型水聽器的信號解調技術 -
On techniques of signal demodulation in fiber bragg grating sensing system
光纖光柵傳感系統信號解調技術的研究 -
Study on techniques of signal demodulation in fiber bragg grating sensing system
光纖光柵傳感系統信號解調技術的研究 -
Through some research in depth on soct, this thesis proposes a scheme of star - type vsat ( very small aperture terminal ) network based on overlap back transmission, and do some research on key techniques involved with the scheme and their partial realization with fpga ( field programmable gate array ), such as spread spectrum techniques, a non - coherent de - spreading spectrum and demodulation technique and adaptive interference cancel
本文在深入研究衛星重疊通信技術的基礎上，提出了一種基於重疊回傳的星形vsat網方案。並在衛星重疊通信涉及的幾種關鍵技術及其部分核心器件的fpga實現等方面進行了一些研究，包括：擴頻技術、非相干解擴解調技術、自適應干擾抵消技術等，並將它們用於基於重疊回傳的星形vsat網方案。 -
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。 -
We propose a chaos - based generation of the random ppm - ps signals, design and implement a generator of the ppm - ps signals. we introduce an if sampling technique and simulate the performances of digital demodulation techniques of using hilbert filters, sine filters, bessel filters and poly - phase filters. the poly - phase filtering method can achieve the higher mirror - frequency rejection ratio by using the low order filters
介紹了中頻采樣技術，並對希爾伯特濾波法、辛格內插函數修正、貝賽爾函數插值法及多相濾波法等數字解調演算法進行了計算機模擬和性能比較，指出多相濾波法能以較低的階數實現較高的鏡頻抑制比。 -
2. several theoretical analysis methods of fiber grating characteristics are presented, including the mode - coupling theory, transfer matrix method, multi - film method and fourier transfer method. the spectra of the fbg and lpg have been analyzed by these methods. the multiplexing techniques and fiber grating demodulation methods are introduced in this dissertation
2 、系統介紹了光纖光柵的理論分析方法，並利用這些方法中的耦合模理論、傳輸矩陣法和傅立葉變換法對布拉格光柵、長周期光柵、啁啾光柵的光譜特性進行了分析並詳細介紹了光纖光柵傳感的復用技術和解調技術。 -
Chapter three is our main block and work, it summarized the high speed physical layer extension ( ieee 802. lib ) standards, explained in details the complementary code keying ( cck ) modulation and demodulation techniques, and then explained and developed the fast walsh transform ( fwt ) that has been used to increase the data rates of these protocols
第三章是論文的主要組成部分，也是本研究工作的重點。這一章總結了高速物理層標準增強版（ 1eee802 11b ） ，並詳細介紹了互補碼鍵控（ cck ）調制解調技術，描述並改進了用於提高數據速率的快速walsh變換（ fwt ） 。 -
In the first place, start with theoretic model of distributed fbg strain - sensing network, sensing principle of fiber bragg grating is analyzed and sensing model created. on the basis of analyzing advantages and disadvantages of several familiar multiplexing and demodulation techniques, a mixture multiplexing method that combines optical frequency domain reflectometry ( ofdr ) and wavelength division multiplexing ( wdm ) is proposed to address fbg sensing array. at the same time, tunable narrow - band light source, which is composed of wide - band light source and tunable optical filter, is adopted to demodulate multiplex signals
首先，論文從分散式光纖光柵應變傳感網路的理論模型入手，分析了光纖布拉格光柵的傳感機理，建立光纖光柵應變傳感模型；在分析比較了常見幾種復用技術和信號解調技術的優缺點基礎上，提出應用光頻域反射復用技術和波分復用技術相結合的混合復用方法來解決光纖光柵應變傳感網路的尋址問題，採用由寬帶光源和可調諧光濾波器組成的可調諧窄帶光源來解調復用信號，通過理論分析和實驗研究證實了系統方案的可行性。 -
Chapter 2 discusses the modulation and demodulation theory and the principle of pll ( phase locked loop ) from the general communication theory to several modern modulation techniques
從通信傳輸的一般原理到幾種具體的現代調制技術，並針對dvb - s接收晶元簡要敘述了qpsk的解調原理。 -
In this dissertation, we mainly focus on the research and realization of fiber bragg grating networks, including the principles and experiments of sensing and demodulation techniques
本論文主要以布喇格光纖光柵為研究對象，對其傳感技術、解調技術以及網路技術進行了理論和實驗的研究。 -
Most of today ’ s demodulation techniques rely on optical filtering method, such as bulk optical edge filters, scanning fiber fabry - perot filters, wdm fiber couplers, acousto - optic tunable filters and mach - zehnder filters
目前，以布喇格光纖光柵（ fbg : fiberbragggrating ）為傳感器件的傳感器已成為研發主流。 -
This paper focus on the key techniques of digital spread and despread spectrum communication system, which includes high speed adc of digital if, digital down converter, digital pn code matched filter and carrier recovery of digital demodulation
本文結合stel - 2000a對全數字化擴頻、解擴中的關鍵技術進行了研究。主要包括數字中頻中的a / d變換、數字下變頻、數字匹配濾波器以及數字化解調中的載波跟蹤技術等。 -
The so - called automatic recognition of modulation ( amr ) schemes automatically classifies the modulation types from the samples of received signal by abstracting the related features such as amplitude, frequency, and phase, followed by employing proper recognition algorithms based on the fast digital signal processing techniques and advanced computing technology. the result of amr can be used in the following processing blocks such as demodulation, supervision processing and anti - interference processing and so on
所謂調制類型自動識別（ amr ）是根據接收信號樣本提取出振幅、頻率和相位的特徵參數，然後藉助信號處理技術和計算機快速處理能力，採用合理演算法進行處理，從而實現對未知已調波調制類型的自動識別，為后繼的解調、監控、抗干擾等處理奠定基礎。 -
Engineering cases indicated : to apply the techniques of resonant demodulation can pick up micro shock pulses of hearing fault, and through analyzing the impact power fault vibration signal characteristics in the fourier chart of the resonant demodulation, the fault diagnosis will be easier
工程實例表明，使用共振解調技術可以有效提取軸承故障微小脈沖沖擊，通過在共振解調傅里葉譜圖上分析沖擊功率故障振動信號特徵，可以較容易地進行故障診斷。
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