中文摘要：

为产生随机性能良好的伪随机序列，提出了一个新的变结构混沌系统。该混沌系统在一个开关函数控制下其系统结构随时间随机地转换，所产生的混沌信号是两个不同的混沌信号的混合，具有良好的复杂性。基于该变结构混沌系统设计了一种伪随机序列发生器，采用NIST标准和STS-2．0b测试套件对其产生的伪随机序列进行了统计性能测试，测试结果表明该伪随机序列发生器具有良好的随机性，可应用于计算机、通信、信息加密等领域中。

英文摘要：

In order to generate high-performance pseudo random sequences, a new variable structure chaotic system is pro- posed, whose structure converts randomly with time under the control of a switching function. The chaotic signal generated in the process of convertion is the mixture of two different chaotic signals, which has good complexity. Based on the variable structure chaotic system, a pseudo random sequence generator was designed. The statistic performance of its randomness was tested with NIST standard and STS-2.0b testing suite. The tested results show that the pseudo random sequence generator possesses good randomness, and can be used in calculators, communications and information encryptions.