频率域航电测量系统抗干扰技术研究

摘要

简要介绍了频率域航电系统的工作原理，分析研究了主要干扰因素的特点和抑制措施。针对 HDY-401三频航电测量系统近频干扰抑制能力不足及噪声电平过载的问题，提出了基于同步滤波和锁定放大技术相结合的微弱二次场信号检测方法；针对航电接收探头的振动及静电干扰问题，采取双层减振和梳状屏蔽措施，有效提高了仪器系统的抗干扰能力。应用相关技术改进研发出一套 HDY-402三频航电测量系统，取得了较好的应用效果。%This paper introduced the work principle of the FAEM system briefly,and analyzed the interference factors and control measures.In order to improve the anti-interference ability and solve the noise level overload problem,a weak signal de-tection method was proposed based on synchronous filter and lock amplifying technology.In addition,the double damping and comb-shielding measures were implied to solve the vibration problem and electrostatic coupling problem.A set of HDY-402 FAEM system has being developed with these techniques and has achieved good application effect in the field survey.