一种改进的混沌扩频序列性能研究

Research on Performance of an Improved Chaotic Spread Spectrum Sequence

混沌现象是非线性动态系统中出现的类随机过程,所产生的混沌序列因其码组丰富、抗干扰、抗截获能力强等特点,常作为跳频中的扩频码使用。本文对原有混沌扩频序列的量化方法进行改进,通过对迭代数值进行门限判决等方法,有效的减少了大量的初始值判决及复杂量化的过程。通过对改进后的Logistic混沌序列随机特性的验证及仿真,结果表明该序列具备良好的扩频特性。

Chaos phenomenon that comes from nonlinear dynamic systems is a random process appearing,the generated chaotic sequence is often used as a spreading code in frequency hopping,because of its rich code group,strong anti-interference,and anti-interception ability.In the paper,the quantization method of chaotic spread spectrum sequence with threshold judgment on the iterative value was proposed,it could effectively reduce a large number of initial value judgments and complex quantization processes.Through the verif ication and simulation of the random characteristics of the improved Logistic chaotic sequence,the results show that the sequence has good spread spectrum characteristics.