为了产生数字混沌PN序列,提出了一种基于FPGA平台的连续混沌数字化技术.针对一个混沌系统,利用理论和 数值仿真对系统的基本特性进行了分析,通过Lyapunov指数谱和分叉图对系统的状态转换进行了分析.在Matlab的Simulink 下,利用DSPBuilder设计了一个电路,并转换成VHDL代码程序,用QuartusⅡ下载到FPGA开发板上进行了实验,在实验中获 得了数字混沌PN序列.另外,对序列的性能进行了 NIST 测试,测试结果表明序列性能良好.%In order to achieve digital chaotic PN sequence, a digital technology for continuous system is proposed based on FPGA platform. For a chaotic system, the system's basic characteristics are analyzed by theory and numerical simulation. The state transition of the system is analyzed by Lyapunov exponent spectrum and bifurcation diagrams. A circuit is designed by DSPBuilder in Simulink of Matlab, and the circuit is translated into the VHDL code and downloaded into FPGA target hardware by Quartus Ⅱ , the digital chaotic PN sequence is observed in the experiment. In addition, perfermance of the sequences is measured by NIST test. The result shows that the perfermance of sequences is good.
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