基于相干光探测的声光测频接收机

摘要

This paper suggests coherent light detection that employs the acoustooptic signal processing.Through the analysis of acoustooptic frequency measurement and the research of the coherent light detection that realizes front-end interception of the electromagnetic signals, it promotes measures to improve precision and resolution ratio of instantaneous measuring frequency. And it uses acoustooptic interaction to build diffraction grating to reduce impacts on signal detection and frequency measurement through inhibitation of noise and interfering signals. According to the experiment, coherent light detection system based on acoustooptic effect is good at filtering in-band noise and beneficial for back-end signal processing system to extract emitting signal, and enhances the system ability to receive weak signals.%提出了一种采用声光信号处理的相干光探测方法,分析了声光测频原理,研究了采用相干光探测实现电磁频谱信号的前端截获,给出了提高系统瞬时测频精度和分辨率的基本措施.通过声光互作用建立衍射光栅,抑制不确定噪声和干扰信号对信号检测和频率测量带来的影响.实验证明,基于声光效应的相干光探测系统对带内随机噪声具有一定的选择和滤波作用,保证后端信号处理对辐射源信息的有利提取,增强了系统接收微弱信号的能力.