The double - channel perpendicular coherent decomposing experimental device adopts the synchronous demodulation , by analyzing and processing the signals , separating useful hardness signals from multiple disturbances 本系统中的双通道正交分解试验装置利用同步检波技术，通过对信号的分析与处理，从众多的干扰信号中提取出待检测的硬度信号。
This paper developed a micro angular rate gyro based on micro piezoelectric ceramic rod structure instead of the sensitive double - deck structure as well as piezoelectric ceramic strain foils , and designed a phase - sensitive detection circuit 摘要研制了基于微型压电陶瓷棒结构代替双敏感梁结构及压电陶瓷片的微型角速率陀螺，并设计了相敏检波电路。
4 . in data acquisition system , the application of phase - locked and synchronous detection reduce the cost of the whole system and improve the sensitivity . carrier signal and modulation signal achieve entirely synchronous too 数据采集系统采用锁相技术、同步检波的原理，降低了整个系统的成本，提高了灵敏度，并使得载波信号与调制信号完全达到同步。
An electromagnetic wave of audio frequency produced by atmospheric disturbances such as lightning , having a characteristically decreasing frequency responsible for a whistling sound of descending pitch in detection equipment 啸声干扰一种由于诸如闪电等大气干扰而产生的音频电磁波，具有典型的逐渐减弱频率的特征，该频减引起了检波设备中调逐渐下降的啸声
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 通过分析gmsk几种算法的优越性以及系统对处理的需求，选择基于正交解调的基带时延检波算法以及tms320vc5402进行基带处理。
4 . we demonstrate the existence of bimodal noise really by studying narrowband bimodal process in detail , that provides the possibility for evaluating the performance of non - coherent detection in communication system with bimodal noise 通过对窄带双模过程的详细研究，说明了双模噪声的现实存在性，为准确评估双模噪声下通信系统的包络检波性能提供了可能。
Then according to the theory of the millimeter object detection , build a 8mm band one - channel direct detection system , which is proposed on the background of the millimeter wave focal plane array imaging system 然后根据毫米波目标探测理论搭建了以毫米波焦平面成像为应用背景的8mm波段单通道直接检波式探测系统并做了原理性试验,验证毫米波目标探测基本理论。
Secondly , the noise of the system is analyzed . to improving the signal - to - noise of the system , design the phase sensitive demodulation system which contains three parts : signal channel , reference channel and correlation demodulator 其次,分析了系统各部分的噪声,以提高系统信噪比为原则,设计了由信号通道、参考通道、相关解调器三部分组成的相敏检波系统。
Each demodulation analysis technique has its merits and limitations . in this paper , the principal and limitations of the hilbert transform and generalized detection - filtering demodulation analysis are systematically studied 通过系统分析和对比现有几种解调分析方法各自的优缺点，本文深入研究了希尔伯特变换和广义检波滤波解调分析技术的原理、局限性及其工程中的应用。
It is introduced the structural design , working principles and performance of the four circuits of the module , i . e . synchronous circuit , trigger - transmitter circuit , clipping - amplifying - detection circuit and gain control circuit 文中主要介绍了构成该电路模块的同步电路、触发发射电路、限幅放大检波电路、模块增益调节电路等4种电路的结构设计、工作原理及性能特点。
