关键词: 混沌吸引子, 切换系统, 微控制器, 现场可编程门阵列

Abstract: In order to strengthen the encryption effects and the anti-crack ability, from the perspective of switching among multiple chaotic systems, this paper realizes a time-sharing switched system. The system can switch among multiple chaotic attractors rapidly at any time. The system uses discrete chaotic equation, defines the charts of multiple chaotic systems, combines with the DSP Builder in the MATLAB, then generates the VHDL language programs corresponding to system charts and the simulation files for Modelsim. According to the expressions of time-sharing switched systems, it improves the VHDL language programs and the programs for MCU. Eventually using the communication between MCU and FPGA, it implements a multiple chaotic attractors time-sharing switched system. By experimental verification, the system not only can achieve the switches between the same chaotic system, but also the switches between multiple chaotic systems. Thus the system can provide chaotic signals include more time-varying, diversity and complexity.

Key words: chaotic attractor, switched system, micro control unit, Field Programmable Gateway Array（FPGA）