中文摘要：

基于时空混沌单向耦合映象格子模型,提出生成伪随机位序列的两种新方法：利用耦合映象格子状态的不变分布特性,选取合适基准对系统中格点状态序列进行判决,生成伪随机位序列;以及基于方向相的思想,通过比较一个格点相邻时间的两个状态值来生成伪随机位序列.对生成序列的性能进行了详细分析,数值实验结果表明,它们具有理想的平衡性、相关性和游程特性,可以应用于信息安全、密码学和数字通信等领域.

英文摘要：

Two novel methods for generating spatiotemporal chaotic pseudorandom-bit sequences （PRBS） based on the one way coupled map lattices （OCML） model are proposed. In the first one, the symbolic sequences are generated by a partition, which is based on the statistic property of the state of the one way coupled map lattice. And in the other, the sequences are obtained by comparing the two consecutive state values of a single lattice of the OCML. We compareed the performance of these two types of sequences with the conventional ones. The numerical experiments demonstrated that the sequences have ideal randomicity, excellent correlation and run-length distribution, and they are good candidates for information security, cryptography and spreadspectrum communications.