中頻脈中壓縮信號(hào)數(shù)字化直接產(chǎn)生技術(shù)研究
On direct digital generation of IF pulse compression signals
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摘要: 該文提出了一種脈沖壓縮中頻信號(hào)數(shù)字化產(chǎn)生方法及硬件實(shí)現(xiàn)方案,對(duì)其中的一些關(guān)鍵問題做出了定量分析;在此基礎(chǔ)上完成了一套波形產(chǎn)生器,可產(chǎn)生6種中頻15MHz、帶寬1MHz、時(shí)寬等于或小于300s的線性調(diào)頻、非線性調(diào)頻信號(hào)。測試表明其諧波與雜散均優(yōu)于-68dB,完全達(dá)到工程應(yīng)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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