关键词: 多维伪随机序列, 时空混沌系统, 猫映射, 统计特性

Abstract: An improved spatiotemporal chaotic model based on coupled tent map lattices is proposed, and a new pseudorandom sequence generator is designed based on this model, which can generate quickly multidimensional and chaotic pseudorandom sequence. The model inherits the parallel iteration mechanism and coupled diffusion in space and time of the coupled tent map lattices system, and use cat map as the coupling method between lattices so as to make the mutual information between different lattices approach zero. The pseudorandom sequence generator based on this model can generate multiple-output multidimensional chaotic pseudorandom sequence, which has the features of uniform distribution and independence of each other, to overcome the fundamental flaws existing in designing of chaotic pseudo-random sequence generator.

Key words: multidimensional pseudorandom sequence, spatiotemporal chaotic system, cat maps, statistical characteristics