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介绍用89C51单片微机控制直接数字频率合成器(DDS)实现短波跳频/四相差分键控(FH/DQPSK)调制系统的调制过程,着重讨论了单片微机控制系统的硬件结构及软件设计。讨论分析了采用AD7008实现该调制的方法并给出实验结果。
This paper introduces the modulation process of FH / DQPSK modulation system using 89C51 single-chip microprocessor controlled direct digital frequency synthesizer (DDS). The hardware structure and software design of single-chip microcomputer control system are mainly discussed . Discuss and analyze the method that adopts AD7008 to realize this modulation and give the experimental result.