DDS的杂散抑制技术及其在频率捷变频雷达中的应用  

Technique to Suppress Spurious Signals of DDS and its Application in Frequency Agile Radar

作　　者：朱伟强 郑晨焱 

机构地区：[1]航天工业总公司8511研究所

出　　处：《现代雷达》1997年第3期82-86,共5页Modern Radar

摘　　要：介绍了一种利用数字直接频率合成器（ＤＤＳ）作为频率基准源的捷变频雷达锁相本振源的方法。针对ＤＤＳ的输出杂散电平严重影响雷达回波这一问题，提出了一种采用频率可控声表面波滤波器组技术，有效地将ＤＤＳ的杂散电平从原来的－３０ｄＢ降低至－６５ｄＢ。该技术已在非相参捷变频雷达数字锁相本振中成功地得到应用。This paper discuss a method that the direct digital synthesizer (DDS) is applied as reference resource in frequency agile radar and present a technique to suppress spurious signals of DDS by adopting frequency controlled surface acoustic wave (SAW) filters banks to counter the spurious signals of DDS influencing seriously radar echo characteristic. This technique make spurious level of DDS reduce to -65dB and has been applied successfully frequency agile radar.

关 键 词：频率捷变雷达 直接式 频率合成器 杂散抑制 

分 类 号：TN958.16[电子电信—信号与信息处理]