| 摘要: |
| 针对经典的李氏指数法（Lyapunov Exponential Method）等混沌相变判别方法复杂度高的问题，提出了一种应用锁相环技术判别混沌相变的新方法。首先，理论推导了混沌系统的解析特性，分析了系统在不同相态下含有的频率成分；〖JP2〗然后，构建了针对混沌系统的数字锁相环模型，研究锁相环下混沌态和大周期态呈现的频率特性；最后，提出了一种基于锁相环技术的混沌相变判别新方法。仿真实验显示，相比于李氏指数法，所提方法判别速度快一个数量级，检测差错率为0时，性能提高近2 dB。新方法应用锁相环技术，简便易行，判别速度快，为混沌相变判别的工程应用提供了新的手段。 |
| 关键词: 微弱信号检测 混沌系统 相变判别 频率特性 数字锁相环 检测性能 |
| DOI：10.3969/j.issn.1001-893x.2017.11.007 |
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| 基金项目:国家自然科学基金资助项目（41606117，41476089，61671016） |
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| Distinguishing chaotic phase transformation by phase-locked loop technology |
| WANG Peng,RUI Guosheng,ZHANG Yang,LIU Linfang |
| () |
| Abstract: |
| For the problem of high complexity of chaotic phase change method based on classical Lyapunov exponential method ,a new method is proposed for discriminating chaotic phase transition by using phase-locked loop(PLL) technique. Firstly, the analytical characteristics of chaotic system are deduced, and the frequency components of the system are analyzed. Then, the digital PLL model for chaotic system is constructed to study the frequency characteristics of chaotic and large periodic states. Finally,the new chaotic phase change method based on PLL technology is proposed. The simulation results show that compared with the Lyapunov exponential method, the proposed method has a faster discriminant speed of one order of magnitude, and when the detection error rate is 0, the performance is improved by nearly 2 dB. The new method using the PLL technology is simple and easy to judge, and it provides a new distinguishing method for the engineering application of chaotic phase change. |
| Key words: weak signal detection chaotic system phase discrimination frequency characteristics digital phase-locked loop detection performance |
《电讯技术》编辑部 