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。 the quadrature (of the circle) 圓積法[作與圓等積的正方形]。 phase quadrature 【物理學】轉象相差,九十度相位差。
Research the digital quadrature demodulation 數字解調技術及其實現。
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
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測量雷達采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。
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幾種算法的優越性以及系統對處理的需求,選擇基于正交解調的基帶時延檢波算法以及tms320vc5402進行基帶處理。
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 研究基于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,并進行仿真和比較,得到較好的方案。
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:基于數字鎖相環的方法、基于正交解調的方法和基于自適應funnel濾波器和滑動goertzel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。
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) 、系統方案論證及仿真、數字下變頻部分的硬件實現、系統調試及結果分析以及系統采用的主要器件介紹等。