Characteristics of Discrete Time Sampling Chaotic Series Based Frequency Modulated Radar Signals0
Applying chaotic series to radar signal design is promising,and has been widely studied in recent years. However,not all chaotic based signals are suitable for radar applications,especially for the high resolution imaging. Different chaotic maps show quite different modulation performance. Ambiguity functions of many chaotic based modulated signals are poor. In order to find better chaotic maps,various chaotic maps and their modulation characteristics were widely researched recently. However,there is little reference to research on the application of discrete time sampling chaotic series up to now,which is detailedly studied in the paper. We firstly present the inspiration of the discrete time sampling method. Then we construct and analyze the regular and random time sampling modeling. We find that the chaotic behavior is remained,the chaotic series autocorrelation gets better,and the phase space structure becomes more complicated by computer simulation. In addition,chaotic series performance with different series length and different discrete time sampling modes are studied. In addition,these chaotic series are applied to the frequency modulation. Ambiguity functions are presented,and their performances are discussed. Simulations based on the Bernoulli map show that longer series with determinate signal pulse width means larger signal bandwidth and better ambiguity function. Moreover,regular discrete time sampling with interval 2 and chaotic discrete time sampling present better frequency modulation performance. We confirm thus that discrete time sampling method can bring much affirmative change in finding a suitable or even perfect chaotic series for radar signal application.
chaotic radar chaotic map chaotic radar signal design chaotic frequency modulation
Yuan Lin
Department of Physics,Shaoyang University,Shaoyang 422004,Hunan,China
国际会议
西安
英文
1491-1496
2011-12-23（万方平台首次上网日期，不代表论文的发表时间）