新SH-COS混沌弱信号检测系统设计

摘要

The chaos theory was applied to weak signal detection,and the SH-COS,a new chaotic circuit based weak signal detection system synthesizing a 3D chaos and a COS function was designed.The SH-COS system's dynamic characteristics were theoretically analyzed,and its circuit simulation analyses were conducted with the software of Matlab and Multisim.The analyzing results show that compared with the performance of the Duffing chaos weak signal detection system that is widely discussed currently and the phase locked amplifier,the new SH-COS system has the features of strong anti noise,wide area diversity in signal detection and high detection accuracy during the measurement process,which can make up their shortcomings of unstable large periodic state and difficulty in distinguishing chaos and periodic state.The large periodic state of the new system's output is convergent,and the correctness of the design method is verified through the simulation results.This shows that the new system has the better performance in weak signal detection,and is more suitable for practical engineering applications.%将混沌理论应用于弱信号检测,设计了一种由三维混沌和余弦函数合成的全新的混沌弱信号检测系统——SH-COS系统,并对其进行了动力学特性的理论分析,用Matlab及Muhisim进行了电路仿真分析.与目前广泛探讨的Duffing混沌弱信号检测系统以及锁相放大器的性能相比,新设计的混沌弱信号检测系统抗噪性能强、检测精度高,而且具有信号检测的广域多样性,弥补了检测系统混沌与大周期状态难以区分、大周期状态不稳定等不足.新系统输出的大周期态具有收敛性,仿真对比结果验证了设计方法的正确性,进一步改善了混沌系统的弱信号检测性能,使定量检测成为可能,因而更适合应用于实际工程领域.