基于AD9910的调频非线性步进信号生成方案

摘要

Nonlinear stepped-frequency chirp signal has good performance on suppression of sidelobes and grating lobes. The constraint conditions on parameters, e.g. , pulse width, pulse repetition interval, total signal bandwidth, etc, are analyzed from the view of implementability as well as in consideration of the abundant waveform generating function of AD9910. Different waveform implementations have significant effects on the performance indices of signal and the system design of waveform generation. Finally, the best scheme of waveform realization applying to AD9910 is introduced by comparing the different schemes. This paper provides an theoretical basis and technical reference to the waveform design and the scheme choice of the signal generation on nonlinear stepped-frequency chirp signal.%调频非线性步进信号具有良好的旁瓣及栅瓣抑制性能,结合AD9910丰富的波形产生功能,从波形实现性的角度分析了调频非线性步进信号的脉宽、重复周期、信号总的带宽等参数需要满足的约束条件,并指出了不同的波形实现方式对信号的性能指标及波形生成系统的设计有着显著的影响.最后,通过比较不同的实现方案,提出了一种适于AD9910的最优波形实现方案,为调频非线性步进信号的波形设计与信号生成方案的选择提供了理论支持和实践参考.