15 results about "Chaotic synchronization" patented technology

The invention provides an M-system chaos shift keying communication method, device, equipment and medium, and the method comprises the steps: generating a long chaos sequence and a short chaos sequence through employing two chaos generators with different chaos mapping, mapping an M-system symbol into an embedded position through employing a symbol-to-position mapping table, and carrying out the mapping of the M-system symbol into the embedded position; a short chaotic sequence is embedded into a corresponding position of a long chaotic sequence to generate a combined chaotic transmitting signal, so that M-system transmission can be realized only through two chaotic generators, and M chaotic mapping is not needed to construct a signal space; and a receiving end adopts a deep neural network demodulation model to carry out probability judgment on the segmented subsequences, so that incoherent demodulation is realized, the traditional chaotic synchronization technology and orthogonalization technology are not needed, the system structure is effectively simplified, and the realization difficulty is reduced.

This invention provides a method for constructing and implementing a memristor-based chaotic synchronization system using FPGA circuits, comprising the following steps: Step 1, constructing the memristor chaotic synchronization system; Step 2, discretizing the memristor chaotic synchronization system to obtain discretized equations; Step 3, designing the various modules of the FPGA chaotic signal generator and converting the discretized equations into a hardware design language; Step 4, designing based on a state machine to solve the chaotic sequence; Step 5, simulating and verifying the designed program at the board level, and analyzing the implementation effect. This invention incorporates a memristor into the chaotic synchronization system, giving it more complex dynamic behavior and noise immunity, enabling it to reach synchronization faster and achieve stable error convergence. This solution addresses the shortcomings of current chaotic systems using analog circuits, such as unstable signals and susceptibility to external environmental interference, and can resist temperature changes and electromagnetic interference, generating high-quality chaotic signals.

The invention relates to a laser chaotic secret communication system based on coherent pumping phase conjugation, which belongs to the technical field of laser communication and comprises a signal transmitting module, an optical fiber link module, a conjugate transpose module and a signal receiving module. The signal transmitting module generates and modulates a chaotic carrier optical signal, and data encryption is realized through phase modulation; the optical fiber link module is used for long-distance signal transmission; the conjugate transpose module adopts an optical comb to generate coherent pump light, and generates phase conjugate waves through four-wave mixing to realize compensation of dispersion and nonlinear distortion in an optical fiber link; and the signal receiving module recovers original data through chaotic synchronization, coherent detection and digital signal processing. The phase locking characteristic of coherent pumping is utilized, the phase noise influence in a traditional pumping system is reduced, the stability of the system is improved, the anti-interference performance of chaotic secret communication and the transmission quality of the system are improved, and a feasible scheme is provided for achieving high-fidelity and high-safety long-distance optical communication.

The application discloses a steel structure welding quality evaluation system and method based on distributed computing. The system includes a distributed gradient sensing unit, a physical field reconstruction unit, an entropy calculation unit, a chaotic feature extraction unit, a resource scheduling unit, a physical constraint verification unit, a chaotic synchronization analysis unit, a data aggregation processing unit, a quality comprehensive evaluation unit and a knowledge base management unit. By distributed acquisition of multi-physical field signals in the welding process and calculation of spatial gradient, the data transmission amount is significantly reduced; the complete physical field is reconstructed from the gradient information by using the multi-grid method; the potential defect area is identified and the computing resources are dynamically optimized based on information entropy analysis; the nonlinear characteristics of the sound signal are analyzed by using the chaos theory; multi-dimensional cross verification is carried out through physical constraint verification and chaotic synchronization analysis; and the federal learning is used to realize multi-site knowledge sharing. The application realizes real-time, accurate and comprehensive evaluation of the welding quality, and provides reliable technical support for steel structure welding quality control.

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 invention discloses a chaos synchronization information security protection system and method based on Beidou receiver time service, and the system comprises a transmitting end which enables a chaos source to generate a noise-like narrow-band chaos signal through filtering sampling and high-precision clock driving of a Beidou time service unit, enables a service signal to be superposed with the narrow-band chaos signal, and enables the service signal to be transmitted to a receiving end; chaos carrier frequency mixing superposition signals are obtained; the scattering channel is used for transmitting the chaotic carrier mixing superposed signal; and a receiving end obtains a synchronous narrow-band chaotic signal by adopting a chaotic source and a filtering sampling unit which have the same parameters as the transmitting end and being driven by a high-precision synchronous clock output by a Beidou time service unit, and then performs subtraction operation on a chaotic carrier mixing superposed signal transmitted by the transmitting end and the narrow-band chaotic signal to recover an original service signal. Accurate clock synchronization of the receiving end and the transmitting end is achieved through the Beidou time service unit, stable chaotic signals high in anti-noise capacity are obtained through the filtering and sampling unit, and long-distance and high-safety information transmission is achieved.

The invention discloses a transmission data security system and method adaptive to a switch, and a medium. A chaotic sequence generation module generates a pseudo-random sequence based on coupled Logistic mapping and Henon mapping; the dynamic port mapping module changes the mapping relation between the physical port and the logic channel in real time according to the chaotic sequence; the chaos driving encryption module maps a chaos sequence into encryption parameters, and dynamically switches among three algorithms of AES-256, SM4 and ChaCha20 and three modes of CBC, CTR and GCM; the port hopping synchronization protocol module establishes a master-slave chaotic synchronization mechanism; the threat detection module detects abnormal behaviors such as port scanning and replay attacks; and the adaptive parameter adjustment module dynamically adjusts the jump period according to the threat level. According to the invention, the data transmission security and the anti-attack capability of the switch are effectively improved.

The invention provides a range radar device based on ultra-wideband resolvable chaotic synchronization, which relates to the technical field of radar range finding and comprises a first ultra-wideband resolvable chaotic signal generation circuit unit, a second digital excitation circuit unit, a third ultra-wideband resolvable chaotic signal synchronization circuit unit and a fourth wideband related receiving circuit unit. According to the invention, the problem of radar real-time ranging with high resolution and high measurement signal-to-noise ratio is solved, high-resolution real-time correlation ranging is realized through the generation circuit and the receiving circuit of the ultra-wideband analyzable chaotic signal, correlation receiving is completed only by simulating a matched filter, and high-sampling-rate data pressure and large correlation calculation amount are avoided. In addition, a receiving end can analyze synchronization of chaotic signals through driving of a digital excitation circuit, and chaotic echo signals are accurately reconstructed to improve the signal-to-noise ratio of distance measurement.

The application provides a design method of an adaptive chaotic synchronization controller based on MANN and DH-PGA algorithms and a secret communication method. The method is used for solving the synchronization problem of a three-dimensional chaotic system under the conditions of uncertainty and external disturbance. By introducing a memristor and a DH-PGA algorithm, the controller not only shows strong robustness when facing system uncertainty and external disturbance, but also can improve the synchronization accuracy and stability of the system through adaptive adjustment. In general, the chaotic synchronization controller based on MANN and DH-PGA algorithms provides an effective solution for the synchronization of complex nonlinear systems, especially in scenes with high real-time requirements and limited computing resources.

The application provides a kind of dynamic encryption security communication system device and method based on multi-longitudinal mode chaos synchronization, belongs to the technical field of chaos communication carrier and space division multiplexing technical field.The device includes chaos signal generation module, information encryption module, optical fiber transmission module, chaos signal synchronization module, information decryption module.In the chaos signal generation module, broadband noise drives Fabry-Perot laser to generate multiple longitudinal mode chaos signals, and the chaos signals of arbitrary longitudinal mode combination are used to encrypt the user information of different cores of seven-core optical fiber, thereby increasing the system key space.In the information encryption module, the confidential information of different users of seven-core optical fiber is first disturbed in intensity by a dispersion element, and then the chaos signals of different longitudinal mode combinations are used to phase-encrypt the confidential information, thereby realizing two-dimensional encryption of the confidential signal in intensity and phase.Meanwhile, the use of space division multiplexing technology effectively improves the communication capacity of the secure communication system.

This invention proposes a self-reference balanced detection optical communication method and system based on the correlation of symmetrical comb teeth pumped by a chaotic microcomb. The method utilizes an on-chip microring resonator to generate a chaotic optical frequency comb. At the transmitting end, one comb tooth is selected as the communication carrier, while the reference comb teeth, which are symmetrical about the pump frequency, are bypassed and retained. The modulated communication carrier and the bypass light containing the reference comb teeth are re-beamed and transmitted. At the receiving end, the modulated carrier and the symmetrical reference comb teeth are filtered out by a wavelength selection device and input into a balanced photodetector for differential detection in the optical domain. The highly correlated intensity fluctuations between the two comb teeth are used to suppress the chaotic background, thereby recovering the signal. This invention eliminates the need for an independent chaotic synchronization source, significantly reducing system complexity, and possesses multi-channel expansion potential, making it suitable for highly integrated secure optical communication scenarios.

The invention discloses a DNA strand displacement-based parametric disturbance hyper-chaotic system dislocation projection synchronization and secure communication method and system, and relates to the technical field of chaotic synchronization and secure communication. Constructing a hyperchaotic system by using DNA strand displacement reaction; a Chen hyper-chaotic system is adopted as a parameter disturbance system, parameter disturbance is applied to the hyper-chaotic system, the dynamic performance of the hyper-chaotic system is further improved by means of the hyper-chaotic characteristic of the Chen hyper-chaotic system, and a response system of the same structure is constructed; designing a dislocation disturbance controller, defining a dislocation error system, stabilizing the error system and compensating parameter disturbance through the dislocation disturbance controller, and realizing dislocation projection synchronization of the hyperchaotic system containing the parameter disturbance; a secret communication scheme of double hyperchaotic encryption is constructed, and dislocation transmission and decryption of biological signals are achieved. According to the method, dislocation projection synchronization of the parameter disturbance-containing hyper-chaotic system is realized, and secondary encryption is performed on the driving signal by utilizing the hyper-chaotic characteristic of the parameter disturbance system, so that the encrypted mixed signal is more complex in form and stronger in randomness, and the secrecy performance of the whole system is remarkably improved.

The invention provides a photoelectric feedback phase decryption system based on a Transform chaos attention mechanism. The photoelectric feedback phase decryption system specifically comprises the steps of construction of a photoelectric feedback phase encryption system, synchronous acquisition of a data set, offline training of a Transform neural network and hardware integration and real-time decryption of a model. And the photoelectric feedback phase encryption output is subjected to phase encryption by a phase modulator through a chaotic carrier generated by self-feedback. And a receiving end recovers the phase information of the encrypted signal through coherent detection, and aligns with the original signal to construct a training data set. And the data set is utilized to train a Transform model into which a chaos attention mechanism is introduced. The trained model is integrated to a programmable gate array, and real-time chaotic synchronization and decryption are realized at a receiving end. Compared with the prior art, the method has the advantages that a Transform chaotic attention mechanism adopted by the method can more effectively model long-range time sequence dependence in a chaotic signal, the synchronization precision and decryption robustness are remarkably improved, and the practicability and flexibility of the system are enhanced.

The invention provides a chaos synchronization accurate control method for industrial robot tracks, and relates to the technical field of industrial control, and the chaos synchronization accurate control method comprises the following steps: fusing a driving current frequency spectrum entropy representing nonlinear load disturbance and a physical system entropy acceleration rate representing irreversible energy dissipation in real time, and combining future track parameters to obtain a chaos synchronization accurate control result; calculating a system chaotic edge distance index through a pre-trained radial basis function neural network, and performing comparison and evaluation; when the chaos edge distance index of the system is lower than a dynamic intervention threshold value, calculating the risk overlimit, and executing cross-level cooperative control response, including reducing the position loop proportional gain in proportion in an equipment control layer to suppress oscillation; in the task planning layer, a risk indication signal is output to trigger track rescheduling; through combination of nonlinear prediction and dual adaptive control, the trajectory precision and operation robustness of the robot under high-speed, heavy-load and other complex working conditions are remarkably improved.