6 results about "Chua's circuit" patented technology

The invention belongs to the technical field of chaotic circuits, and discloses a sine nonlinear characteristic-based third-order circuit system, which comprises a sine nonlinear function circuit and a third-order linear differential equation circuit, the input end of the sine nonlinear function circuit is connected with the x output end of the third-order linear differential equation circuit, and the output end of the sine nonlinear function circuit is connected with the x output end of the third-order linear differential equation circuit. The output end is connected with one input end of the x integrator of the third-order linear differential equation circuit; the sine nonlinear function circuit is composed of a first operational amplifier A1, resistors R1 to R16 and diodes D1 to D6, and the output and the input of the sine nonlinear function circuit are in a sine nonlinear function relationship; the third-order linear differential equation circuit forms three anti-phase addition integrators by three anti-phase operational amplifiers, three capacitors and seven resistors, and the sine nonlinear function circuit provides nonlinear signals to generate three Chua's chaotic signal outputs of the sine nonlinear third-order Chua's circuit; according to the invention, various chaotic line systems and chaotic secret communication systems can be formed.

The invention belongs to the technical field of chaotic circuits, and discloses a sine nonlinear signal processing-oriented multi-order circuit system, which comprises a sine nonlinear function circuit, a fourth-order linear differential equation circuit and a fifth-order linear differential equation circuit, and is characterized in that the sine nonlinear function circuit consists of an operational amplifier A1, resistors R1 to R16 and diodes D1 to D6; the output and the input are in a sine nonlinear function relationship; the fourth-order and fifth-order linear differential equation circuit consists of an inverting operational amplifier, a capacitor and a resistor, and is used for generating a plurality of Chua's chaotic signal outputs of the sine nonlinear fourth-order and fifth-order Chua's circuit; the circuit can form various chaotic circuit systems and chaotic secret communication systems.

This disclosure provides an adaptive restraint control method and system for fixed-time synchronization of coupled Chua's circuits, relating to the field of network adaptive control technology. The method includes: establishing a nonlinear complex network model of the coupled Chua's circuit; constructing a topology graph of the coupled Chua's circuit and converting it into a strongly connected graph, while simultaneously dividing all Chua's circuit nodes into restraint points and non-restraint points; constructing a system error model of the coupled Chua's circuit, analyzing the synchronization error of the coupled Chua's circuit system, and designing control methods for the restraint points and coupling strength formulas between the non-restraint points and their connected nodes based on Lyapunov stability principles and fixed-time synchronization principles; constructing a Lyapunov function, and solving for the synchronization time of the coupled Chua's circuit based on the controller input of the restraint points and the coupling strength formulas for the non-restraint points. The circuit system disclosed herein can achieve synchronization within a fixed time in various environments.

The application provides a non-periodic intermittent-based fractional-order Chua circuit system finite time control method and system, comprising: setting an initial state of the fractional-order Chua circuit system, and measuring a state variable of the fractional-order Chua circuit system by using a sensor; constructing a finite time non-periodic intermittent controller by using the state variable measured by the sensor; converting a digital control signal output by the finite time non-periodic intermittent controller into a physical quantity by using an executor, and injecting the physical quantity into a corresponding node of the fractional-order Chua circuit system in a working interval, so as to realize finite time stable control of the fractional-order Chua circuit system. The application provides a new solution for finite time control of the fractional-order Chua circuit system, can be applied to fields such as chaos synchronization and secret communication, and has theoretical value and engineering practicability.

The application discloses a codebook rotation angle perturbation method and device, a terminal and a storage medium in the technical field of communication, and aims to solve the problems of communication transmission security and the like. The method comprises the following steps: inputting a key of an initial codebook into a pre-constructed Chua circuit target function model to obtain a chaotic sequence; performing a rotation operation on mother constellation points in a pre-constructed mother codebook according to a rotation angle generated by the chaotic sequence to obtain new user constellation points; obtaining a codebook mapping constellation based on a mapping relationship between the new user constellation points and the mother constellation points, wherein the codebook mapping constellation is obtained by using a pre-constructed factor graph and a factor matrix to obtain a new user codebook; performing codebook mapping on data input into the sending end by using the new user codebook, and performing a modulation operation to obtain sending data of the sending end. The application realizes encryption of the codebook, improves the security of information transmission, and obtains an optical transmission system with high stability, high spectrum efficiency and high security.

The invention provides a control method for ensuring preset time convergence and transient performance of a Chua's circuit system, which belongs to the technical field of control algorithms, and is technically characterized by comprising the following steps: S1, defining a time-varying function mu (t); s2, defining a convergence rate boundary function psi (t); s3, assigning k1, k2 and k3; s4, VC1, VC2 and IL are input; and S5, solving an input voltage u-time t curve of the voltage source. By adopting the control method provided by the invention, the preset time convergence and the preset convergence speed of the voltage / current can be ensured at the same time, so that the requirements of practical application on high efficiency, high reliability and the like are met.