一种基于微波的窃听方法

Eavesdropping Method Based on Microwave

提出了一种微波窃听方法,经天线发射出去的微波被声源的振动所调制,反射回来的调幅波经晶体检波器解调,再经选频、放大把音频信号还原。实验中,采用实验室常用的3 cm微波波段波导型器件,配合自制的接收电路,实现了声音的还原。结果表明,该方法简便、易行,便于操作,能够满足一般实验演示的要求。

A method of microwave eavesdropping is proposed.The carrier wave from the antenna was modulated by the sound vibration,the amplitude-modulated wave reflected from objects were demodulated by a crystal detector,and restored audio signal by frequency selection and amplification.This experiment used the common 3 cm waveguide equipments from the lab and homemade receiving circuit for that the sound could be reproduced.The results show that this equipment is convenient and easy to operate,and is able to meet the requirements of common experiment.