摘要
为了遏制考试中的作弊现象,本文开展了点对点的非常规波段的干扰系统设计。首先,提出了基于DDS+PLL的系统总体方案,其次,采用Simulink进行了仿真验证,再次,设计了本振、调制、放大、DDS等功能模块,最后进行了实验验证。结果表明,本系统可以干扰距离为50m以内、频率范围为200~800MHz的作弊信号,在各类考场、法庭、监狱、保密会议室等严禁对外收发数据的场所具有一定的工程应用价值。
In order to curb cheating in exams,the design of point-to-point unconventional band interference system is proposed.Firstly,the overall scheme of the system based on DDS+PLL is put forward.Secondly,the simulation is carried out by using simulink.Thirdly,the local oscillator,modulation,amplification,DDS and other functional modules are designed.Finally,the experimental verification is carried out.The results show that the system can interfere with the 200~800 MHz cheating signal within the frequency range of 50 m,in various examination halls,courts,prisons and confidential conference rooms.It has certain engineering application value to forbid the place of sending and receiving data to and from foreign countries.
作者
李禹剑
李剑
辛伟瑶
Li Yujian;Li Jian;Xin Weiyao(North University of China,Taiyuan 030051,China)
出处
《单片机与嵌入式系统应用》
2019年第10期86-89,共4页
Microcontrollers & Embedded Systems
基金
山西省面上青年资金资助(201801D221205)
山西省高校创新项目资助(201802083)
“十三五”装备预研兵器工业联合基金(6141B012904)资助
