基于DDS技术的通信激励器设计

Design of Communication Exciter Based On DDS

针对传统的短波通信干扰机激励器一般只是单独一个模块,没有用到计算机等已有的强大的控制平台,这导致开发成本高,信号质量不高,产品升级困难等问题。设计了一种短波通信激励器,此激励器能产生短波波段任意频率的调幅信号。利用VC软件编写应用软件,通过计算机并口输出干扰信号,计算机串口发送控制信号并接收反馈信号。基于直接数字频率合成器(DDS)的硬件电路对干扰信号进行调制,生成调幅信号,再通过天线发射出去。实验证明该设计满足要求。

The traditional jam exciter of shortwave communication is usually a single module and makes no use of the existing powerful controllers as computer,and this would result in high development cost,low signal quality,difficult upgradation of production,and so on.Thus a novel exciter of shortwave communition is designed and developed,which can generate any AM signal in the short-wave band.First a application software is compiled by means of Visual C＋＋,and thus the jam signal is generated.The jam signal is exported via the parallel port of PC.The signal that controls how to generate AM signal is imported and exported via the serial port of PC.Then a hardware circuit based on DDS is designed and implemented,thus to modulate the jam signal generated by PC and the be AM signal is generated.Finally the AM signal is sent by antenna.The experimental result indicates that this implementation could meet the design demands.