【摘要】 介绍了 MSK信号的特点、转换法产生 MSK信号的原理及直接数字频率合成技术 ,提出了用 AD985 4实现 MSK载波调制的方案。研制了基于 DDS方法的 MSK载波调制器 ,通过实验从几个方面对比了模拟转换法和 DDS方法生成的 MSK信号。结论表明 DDS方法能够替代转换法。更多还原

【Abstract】 The characteristics of MSK signal and the generation of MSK signals with analog methods are presented.The DDS(Direct digital synthesis)technology is introduced and the implementation of MSK carrier modulation with AD9854 is proposed.Finally,a MSK modulator based on DDS is designed and a comparision of MSK signals between two different methods are made through experiments. The results prove that DDS method can take place of traditional methods.更多还原