摘要
针对现代雷达信号所应具备的特性,提出了基于直接数字合成技术(DDS)的混沌调相信号和混沌二相编码信号生成方案。该方案利用直接数字合成技术和混沌序列复本相关技术,将混沌序列作为相位控制字的输入,可得到混沌调相信号和混沌二相编码信号。通过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,仿真试验证明了该算法的有效性。
According to the properties of modern radar signals, the generating schemes of chaotic phasemodulated signals and chaotic bi-phase coded signals on the basis of direct digital synthesis technology （DDS） are presented. With DDS and duplicate correlation method, the chaotic sequence is chosen as a phase control word. Then, the chaotic phase-modulated signals and chaotic bi-phase coded signals are generated. The ambigu- ity characteristics of the signals are researched by the statistic average of wideband ambiguity functions, and the anti-interference performances are analyzed. The simulation examplesshow the effectiveness of the proposed approaches.
出处
《系统工程与电子技术》
EI
CSCD
北大核心
2009年第4期826-829,共4页
Systems Engineering and Electronics
基金
国家自然科学基金资助课题(10272113)
关键词
直接数字合成
混沌调相
混沌二相编码
信号生成
direct digital synthesis
chaotic phase modulation
chaotic biphased code
singal generation
