一类混沌序列调频数字合成信号模糊特性分析  

Analysis of the Ambiguity Characteristic of Digital Synthesis Signals with Chaotic Frequency Modulation

作　　者：刘诗华[1] 王德石[1] 谌龙[1] 

机构地区：[1]海军工程大学兵器工程系,湖北武汉430033

出　　处：《电子学报》2007年第9期1784-1788,共5页Acta Electronica Sinica

基　　金：国家自然科学基金(No.10272113)

摘　　要：提出运用直接数字合成技术的混沌调频信号生成方案,并对信号的模糊特性进行分析.以随机过程理论为基础,分析了有限字长条件下混沌序列的随机特性,得出满足应用要求的字长条件.以直接数字合成技术和混沌序列复本相关技术为基础,将混沌序列作为频率控制字生成混沌调频信号.用宽带模糊度函数统计平均方法研究了信号的模糊特性,并对信号的抗干扰性能进行了分析.A scheme of signals with chaotic frequency modulation on the basis of direct digital synthesis technology （DDS） is presented, and the ambiguity characteristic of the signals is analyzed. Based on stochastic process theory, the stochastic characteristic of limited word length chaotic sequences is studied and proper condition of word length for application is obtained. With DDS and chaotic sequence duplicate correlation method, signals of chaotic frequency are generated. The ambiguity characteristic of the signals are researched by the statistic average of wideband ambiguity function,and the anti-interference performance is analyzed.

关 键 词：混沌 DDS(Direct Digital Synthesis) 调频 模糊度函数 

分 类 号：TN97[电子电信—信号与信息处理]