中频脉中压缩信号数字化直接产生技术研究
On direct digital generation of IF pulse compression signals
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摘要: 该文提出了一种脉冲压缩中频信号数字化产生方法及硬件实现方案,对其中的一些关键问题做出了定量分析;在此基础上完成了一套波形产生器,可产生6种中频15MHz、带宽1MHz、时宽等于或小于300s的线性调频、非线性调频信号。测试表明其谐波与杂散均优于-68dB,完全达到工程应用要求。Abstract: In this paper, a method of direct digital generation of intermediate frequency(IF) pulse compression signals is proposed, and the hardware architecture is also presented. Some key issues are analyzed quantitatively. Based on these, a generation system is implemented, which is applicable to generate six kinds of LFM, NLFM waveforms. The designed IF reaches 15MHz and bandwidth reaches 1MHz with timewidth equal to or less than 300s. The measuring results of SFDR and noise are all below-68dB, which show that the performances of the system can meet the needs of practical engineering application.
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