单驱动源混沌测量方法

A Method of Chaotic Measurement with Single Drive Source

混沌运动的基本特征表现为对初值的敏感依赖性。利用混沌轨道随初值的变化 ,定义了轨道距离 ,通过测量混沌轨道的距离测得该初始值。但混沌系统也同样对干扰极度敏感 ,初值相同的轨道由于电路中的噪声会指数分离 ,从而又完全否定了混沌系统可应用于小信号的测量 ,问题的关键是怎样降低电路的噪声。提出了一种新的混沌测量方法 ,与已有的混沌测量电路相比 ,该方法采用一个压控恒流源向混沌振子提供充放电电流。实验结果表明 。

An essential feature of chaotic dynamics is sensitively dependent on initial conditions. A distance between two orbits has been defined because chaotic orbits change with initial conditions. By measuring distance of chaotic orbits, the initial value can be measured. In the same way, chaos is extremely sensitive to perturbations, orbits with equal initial conditions can also exponentially drift apart. It is thus completely negated that a weak signal can be measured in chaotic systems. It is a key quesition that how we reduce noise in nonlinear circuits. In this paper, a new chaotic measurement method is proposed, comparing with before,which gives charge and discharge current to a chaotic oscillator by a voltage controlled current source. Experiment results show that its linearity and stability are well improved.