12 results about "Chua's circuit" patented technology

The invention provides a non-fragile state estimation method and system of a Chua's circuit system under an error code condition, and belongs to the field of signal processing. The problem that the existing state estimation method cannot consider communication limitation, random change coupling, multiple random time-varying delay, nonlinearity, bounded random noise and estimator gain change at the same time, so that the state estimation performance is reduced is solved. The method comprises the following steps of: sequentially establishing a mathematical model taking a Chua's circuit as a complex network system node, a mathematical model in which a binary bit obtained by coding randomly generates an error code when being transmitted, a mathematical model for recovering a measurement signal after compensating the error code, and a mathematical model of a non-fragile state estimator, and then calculating a node state estimation error. Obtaining an overall estimation error augmentation system of the complex network system, and finally solving the unknown gain of the non-fragile state estimator. And substituting the gain into the non-vulnerability state estimator to realize estimation of the mathematical model taking the Chua's circuit as the complex network system node.

This invention discloses a simple intermittent quantization control method for Chua's circuit systems. This method first designs an indirect signal-based estimation algorithm to estimate unknown states and disturbances in the network system. Then, two threshold functions are designed to construct an aperiodic intermittent control strategy. A uniform quantization controller quantizes the system's control inputs to reduce the transmission of redundant control signals. When applied to Chua's circuit systems, this method achieves excellent unknown state and disturbance estimation results and effectively conserves system control resources.

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 discloses a Chua's circuit memory event trigger control method for resisting replay attacks, and belongs to the technical field of Chua's circuits and network control. The method comprises the following steps: converting a Chua's circuit model into a Lur'e system mathematical model through a variable replacement technology; an elastic memory event triggering mechanism is provided, and an anti-attack memory controller is designed based on the elastic memory event triggering mechanism; constructing a closed-loop Lur'e system in combination with an elastic memory event triggering mechanism and an anti-attack memory controller, and establishing a criterion for ensuring the stability of the mean square H infinity of the closed-loop Lur'e system; based on the proposed criterion, a collaborative design scheme of the controller gain and the event trigger matrix is given. According to the invention, stable operation of the Chua's circuit under acceptable replay attacks can be effectively ensured, unnecessary data transmission can be reduced, and network communication resources are saved.

The invention provides a finite time control method and system for a fractional-order Chua's circuit system based on non-periodic intermittence, and the method comprises the steps: setting an initial state of the fractional-order Chua's circuit system, and measuring a state variable of the fractional-order Chua's circuit system through a sensor; a finite-time non-periodic intermittent controller is constructed by using a state variable measured by a sensor; a digital control signal output by a finite-time non-periodic intermittent controller is converted into a physical quantity through an actuator, the physical quantity is injected into a corresponding node of the fractional-order Chua's circuit system in a working interval, and finite-time stable control over the fractional-order Chua's circuit system is achieved. The invention provides a new solution for finite time control of the fractional-order Chua's circuit system, can be expanded and applied to the fields of chaos synchronization, secret communication and the like, and has theoretical value and engineering practicability.

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.

This paper discloses a new criterion for Chua's circuit systems based on fault-tolerant synchronous control. This method considers a Chua's circuit system model containing unknown system states and fault signals under the interference of external noise. Furthermore, a projection network is designed to reduce the dimensionality of the system state space through clustering and aggregation, and all nodes are divided into measurable and unmeasurable clusters according to whether they are measurable or unmeasurable. An average intermediate observer is used to estimate unknown components, and a corresponding fault-tolerant controller is constructed to compensate for unknown actuator failures, ensuring that the estimated error system is consistently and ultimately bounded, thereby achieving synchronization of the error system.

The present invention discloses a fixed-time algebraic parameter estimation algorithm for a Chua circuit system. Based on the constructed fixed-time algebraic parameter estimation algorithm, the fixed-time algebraic parameters of the predicted output are estimated. The fixed-time algebraic parameter estimation algorithm is constructed as follows: according to the Chua circuit system, a nonlinear mathematical model is established; the Volterra integral operator is used to determine the kernel function; the fixed-time stability is determined; and based on the kernel function and the nonlinear mathematical model, the fixed-time algebraic parameter estimation algorithm is constructed. The present invention can achieve accurate estimation of parameters within a fixed time without depending on the initial value of the system when only the output signal is known; by cleverly selecting the kernel function in the Volterra integral operator, the influence of the system initial value can be effectively eliminated, and at the same time, the calculation of the derivative of the output of the Chua circuit system is avoided; different from the traditional adaptive parameter estimation algorithm, the algebraic parameter estimation algorithm proposed by the present invention can achieve fast and accurate estimation of parameters.