一种基于遗传算法的DDS脉冲波形优化方法

One Optimizing Method for DDS Pulse Waveforms based on Genetic Algorithm

直接数字频率合成(DDS———D igital D irect Frequency Synthesis)是一种新的频率合成技术,具有频率分辨率高、频率切换快、超宽的相对带宽、连续的相位特性和全数字化等优点.DDS实际上是波形的合成技术,可以输出高稳定度的任意波形.对脉冲产生型DDS中输出信号的过冲和振铃进行了讨论,提出了用遗传算法优化脉冲波形以减少过冲和振铃的方法,并用计算机仿真结果进行证明.

Direct Digital Frequency Synthesis （DDS） is a new technology of frequency synthesis, which possesses the advantages of high frequency resolution, fast frequency switching, super - wide relative band width, successive phases, total digitalization, etc. In fact, DDS is a technology for waveform synthesization that is able to output any waveform with high stability. This paper discusses the overshooting and ringing in the output signals in pulse - generating DDS, puts forward the methods to optimize pulse waveforms with the help of genetic algorithm so as to reduce overshooting and ringing, and demonstrates the methods with computer simulation.