180 results about "Chaotic" patented technology

The invention discloses a chaotic stirring control system based on ARM single chip chaotic mapping control. The system comprises an ARM single chip which is connected and communicated with an input device, a drive chip and an AD (analog to digital) conversion chip respectively; the drive chip is connected with an H bridge drive circuit, the H bridge drive circuit is connected with a direct current motor, the direct current motor is connected with a chaotic stirring system, a sensor which monitors the rotating speed and a current signal of the direct current motor is arranged on the direct current motor, and the sensor is connected with the AD conversion chip. The system adopts a full digit circuit, has good stability and high reliability, can accurately control and conveniently adjust the rotating speed of the motor, is wide in application range, and can meet requirements of different stirring parameters under various work conditions.

A communication system having a transmitter chaotic signal generator and a receiver chaotic signal generator which when uncoupled generate state signals along substantially identical chaotic attractor trajectories in an out of phase relation. A controller controls the transmitter chaotic signal generator to transmit a state signal having segments of the deterministic state trajectory which identify a subsequent length of the deterministic state trajectory matching an input N-bit sequence. A receiver coupler receives the transmitted state signal and, if the signal is above a threshold for a duration of approximately two bit periods, synchronizes the receiver chaotic signal generator to the segment of its deterministic state trajectory indicated by the state signal to generate, with or without coupling, the subsequent length of that state trajectory matching the input N-bit sequence. A receiver symbol detector reconstructs the N-bit sequence based on the receiver chaotic oscillator state signal.

The invention discloses a method for solving a logistic transport vehicle routing problem with soft time windows. According to the method, for the purpose of solving the problem of the logistics transport vehicle routing problem with the soft time windows on the basis of real-time traffic information, a time window punishment mechanism is employed and a mathematic model is established; and the model is solved by use of a self-adaptive chaotic ant colony algorithm, and the searching optimization capability of the algorithm is improved through self-adaptive updating of algorithm information elements and chaotic self-adaptive adjustment of algorithm parameters. According to the invention, the method better matches logistics distribution in realistic production life, the problem is solved by use of the self-adaptive chaotic ant colony algorithm, the optimization search capability is better, a search process is effectively prevented from partial optimum, the diversity of solutions and the global searching optimization capability are improved, the global updating strategy is improved, an elite strategy is introduced, and positive feedbacks of information elements released by high-quality ants are properly improved; and the upper limits and lower limits of the information elements and the information element increments are arranged so that overlarge differences of the information elements on a path are reduced, and the classic vehicle routing searching optimization problem is solved by use of the self-adaptive chaotic ant colony algorithm.

The present invention relates to a chaos cipher sequence generator, including linear feedback shift register (LFSR) sequence with scramble limited accuracy to implement chaos system and cryptographic alogorithm. Its cipher system adopts output-group feedback basic working mode (OFM), feedback register R provides the input of group encryption algorithm E defined by key K, and the group legnth of grup algorithm of R in cipher iteration every time is 0-1 sequence of Nbbits, its initial bit Io has no need of privacy, but must be changed with message. Said invention chaos cipher sequence generator integrates the advantages of chaos technology, LFRS and Rijndael high intensity encryption algorithms, so that it can be extensively used in data encryption, privacy communication and information safety.

The invention provides an image encryption method based on a Feistel network and dynamic DNA encoding. The method comprises the following steps: computing a Hash value of an original plaintext image by using a Keccak algorithm, and taking the Hash value as an initial value of a hyper-chaotic Chen system, generating a Hill encryption matrix by using a chaotic sequence generated by the hyper-chaoticChen system so as to replace pixels of an original image; realizing image pixel value diffusion by using the DNA encoding operation as a F function of the Feistel network, and a DNA sequence base asa key of the Feistel network; and performing further diffusion through ciphertext feedback. Through three turns of chaotic scrambling-DNA encoding-Feistel conversion-DNA decoding, the ciphertext randomness and attack resistance are stronger, the scrambling conversion of the image pixel location and the diffusion of the pixel value are realized, and the encryption turn is reduced due to repeated scrambling and DNA encoding and decoding. Through the image encryption method provided by the invention, the image can be effectively encrypted, the plaintext sensitivity is strong, the plaintext attack, the differential attack and the statistical attack can be effectively resisted

The invention belongs to the control field of multimode fiber sensing chaotic lasers, and particularly relates to a control system for multimode fiber modulation chaotic laser. The chaotic laser controller comprises an Erbium-doped fiber laser, a circulator, a single-mode-multimode-single-mode fiber structure, an optical detector and an environmental control device, wherein laser generated in the Erbium-doped fiber laser enters the single-mode-multimode-single-mode fiber structure from one end of the circulator, is led out from the other end of the circulator and then enters a resonant cavity of the Erbium-doped fiber laser to become feedback light and generate chaotic laser; the chaotic laser enters the optical detector through a wavelength division multiplexer in the Erbium-doped fiber laser; and the environmental control device is mounted at a multimode fiber in the single-mode-multimode-single-mode fiber structure so as to control the environment outside the multimode fiber. The chaotic laser controller has the characteristics of capabilities of adjusting the wavelength, the intensity and the like of feedback light, convenience in operation, simple structure, low probability of electromagnetic interference, wide wavelength adjustment range and the like.

The invention relates to an optical fiber fault detecting system based on an optical fiber laser chaotic signal. The system comprises a chaotic light generator, a first optical fiber coupler, a circulator, a first photoelectric detector, a second photoelectric detector, a signal acquirer and a signal processing device, and is characterized in that the chaotic light generator is an annular cavity consisting of a semiconductor light amplifier, a polarization controller and a second optical fiber coupler; and light in the annular cavity is output from the second optical fiber coupler and enters the first optical fiber coupler after passing through a light isolator. Remote optical fiber breakpoint positioning with high precision is realized, the problems of limitation of transmission light time domain reflectometer distance to precision and low LD external injection type chaotic light time domain reflectometer precision are overcomed, and the detection precision of a chaotic light time domain reflectometer is improved to the mu m level.

The invention discloses a wien-bridge chaotic oscillator based on a firs-order generalized memory resistor. The wien-bridge chaotic oscillator based on a firs-order generalized memory resistor comprises a capacitor C1, a capacitor C2, a capacitor C3, a inductor L, a resistor R1, a resistor R2, a resistor R3, a resistor R4, an operational amplifier U1, and the memory resistor M comprised of a diode bridge cascade RC filter; wherein, the memory resistor M comprised of the diode bridge cascade RC filter comprises a diode D1, a diode D2, a diode D3, a diode D4, a resistor R0, and a capacitor C0. The wien-bridge chaotic oscillator based on a firs-order generalized memory resistor according to the invention is simple in structure, and through regulating reference values of elements of the circuit, the wien-bridge chaotic oscillator can exhibit different chaotic characteristics and obtain a chaotic behavior with complex dynamic characteristics. The memory resistor equivalent circuit according to the invention has no limitation of being grounded, i.e. the equivalent input end requires no ground processing and enables to be connected in series into the existing oscillating circuit. The dynamic characteristics of the memory resistor chaotic circuit according to the invention do not depend on the initial state, and the complex nonlinear physical phenomenon is avoided effectively.

A micro mixer for use in a microdevice which utilizes time-varying force fields to induce bulk fluid and/or sample component motion leading to homogenization of sample components. Time-varying force fields employed includes at least one of a physical displacement field, electrical field, pressure field or magnetic field to generate transverse forces which induce the mixing of samples within the micro mixer.

A circuit for generating chaotic signals implemented using heterojunction bipolar transistors (HBTs) and utilized in low probability intercept communications. The HBT chaotic circuit generates truly random analog signals in the GHz range that are non-repeating and deterministic and may not be replicated by preloading a predetermined sequence. A fully differential autonomous chaotic circuit outputs two pairs of chaotic signals to be used in a communication system. As it is impossible to generate identical chaotic signals at the transmitter and receiver sites, the receiver itself sends the chaotic signal to be used for encoding to the transmitter. The receiver includes a chaotic signal generator and digitizes, upconverts, and transmits the generated chaotic signal to the transmitter. The transmitter uses the received chaotic signal to code data to be transmitted. The receiver decodes the transmitted data that is encoded by the chaotic signal to retrieve the transmitted data.

The invention discloses a laser chaotic spread-spectrum transformation system with a time delay hiding characteristic. A chaotic optical signal generated by an external-cavity semiconductor laser is subjected to spread-spectrum transformation through a time lens which is composed of photoelectric phase modulators PM1 and PM2 and a high-dispersion medium. To be specific, on the basis of time-frequency transformation of time domain Fourier transformation, chaotic spectrum is widened through increase of the dispersion measures; time delay label is hidden through adjustment of the relationship between a driving signal period and feedback time delay of a chaotic laser; spectrum is flattened as the chaotic laser signal is output after the spread-spectrum transformation based on the noise characteristic of chaotic signals; and a big efficient bandwidth is obtained.

The invention provides a single channel chaotic signal blind source separation method, and belongs to the technical field of electronic information. The separation method is characterized in that modules used in the method comprise an ensemble empirical mode decomposition module, a correlation analysis module, a principal component analysis module and an independent component analysis module. The separation method comprises the steps that single channel signals formed by mixing multichannel chaotic signals are decomposed to mutichannel intrinsic mode function components through the empirical mode decomposition module; first time dimensionality reduction is performed on pivot elements of the multichannel intrinsic function components by using correlation analysis; then second time dimensionality reduction is performed on the pivot elements of the multichannel intrinsic function components by using a main component analysis method; finally blind source separation of the mixture chaotic signals is completed by using independent component analysis technics, and source signals are restored. The separation method has the advantages that the number of transmission channels can be effectively decreased, the purposes of reducing the complexity of hardware and saving equipment cost are achieved, and the source signals can be restored quickly and effectively.

The present invention discloses a sliding mode robust control method of a discrete time delay uncertain system. A multi-population chaotic simulated annealing particle swarm optimization algorithm is used to optimize a support vector regression machine (SVR) structure parameter, a combined kernel function support vector regression machine is used to give a system prediction model, a control law is solved through a novel sliding mode reaching law, and the reachability of a sliding mode can be guaranteed. The method is used for the robust control of uncertain discrete system with state time delay.

The present invention relates to a pixel and DNA cross dynamic chaotic cipher-based image encryption method and device. The method comprises the following processing of ranking the pixels of a plaintext image to obtain a first index matrix, and carrying out the first chaotic coding on the plaintext image according to the first index matrix to obtain a first intermediate image; ranking the rows andthe columns of the first intermediate image separately to obtain a row index matrix and a column index matrix, and scrambling the first intermediate image according to the row and column index matrixes to obtain a second intermediate image; converting each pixel in the second intermediate image into a 4-base DNA sequence, selecting eight kinds of coding rules satisfying a Watson-Crick complementrule according to the second chaotic coding, adopting the above eight kinds of coding rules to carry out the complementary DNA coding on each DNA sequence in the second intermediate image to obtain athird intermediate image, and then carrying out the DNA subtraction, add operation and xor operation on the third intermediate image to obtain a fourth intermediate image; carrying out the adjacent DNA coding on the fourth intermediate image to obtain a final ciphertext image.

The invention discloses a laser chaotic spread spectrum transformation system with a time-delay hiding characteristic. Chaotic optical signals generated by an external cavity semiconductor laser are subjected to spread spectrum transformation through a time lens composed of an optical phase modulator and a high-dispersion medium; specifically speaking, chaotic spectrum broadening is realized through increasing dispersion quantity based on a situation that time-domain Fourier transformation performs time-frequency conversion; time delay tag hiding is realized through adjusting the relationship of a driving signal period and chaotic laser feedback delay time; and chaotic optical signals are outputted according to the noise type of the chaotic signals after the spread spectrum transformation is performed, and therefore, a spectrum can be flat and has large effective bandwidth.

The invention discloses an image encryption algorithm based on blocking DNA encoding and even scrambling. The image encryption algorithm includes two portions: evenly scrambling pixel positions of images by combining a chaotic sequence generated by a Logistic chaotic mapping with Arnold cat conversion; scrambling pixel values of images by Lorenz chaotic mapping and DNA encoding. Finally, the two portions are combined to obtain the image encryption algorithm which can be used for encrypting square images.

The invention discloses a method for detecting the weak signal of the echo state network based on the improved teaching optimization algorithm in the chaotic background. The method adopts the improved teaching optimization algorithm (ITLBO) algorithm to optimize the parameters of the echo state network model. Determine the number of optimized parameters, the value of the reserve pool size N and the sparsity SD, and encode the rest of the parameters; secondly, find the optimal echo state network model parameter combination through the teaching stage, learning stage, and feedback stage of ITLBO and compare these Modeling, training and prediction of parameters, analysis of the single-step prediction error and judging whether there is a weak target signal in the chaotic background noise, using this method to simulate the Lorenz chaotic background and the actual sea clutter signal, accurately and quickly Detect weak signals; overcome the shortcomings of difficulty in selecting parameters of the echo state network model, and improve work efficiency.

The invention relates to a chaotic transmitter which can precisely measure a distance between the transmitter and a receiver, thereby efficiently regulating transmission power according to the distance. The chaotic signal transmitter includes a chaotic signal generator for generating a chaotic signal and a quantizer for quantizing a transmission signal with a predetermined number of steps. The chaotic signal transmitter also includes a modulation controller for controlling the modulation of the chaotic signal according to the quantized transmission signal. The chaotic signal transmitter further includes a modulator for modulating the chaotic signal from the chaotic signal generator in a multiple OOK mode to output a plurality of chaotic signals and a combiner for combining the plurality of modulated chaotic signals.

The invention discloses a hyper-chaotic signal source circuit of a hidden Lu system based on a memristor. A memristive term is added to a first equation of the original Lu system, and a linear feedback term and an external excitation term are added to a second equation. The system circuit comprises a memristor equivalent implementation circuit and an oscillating system. After the respective same ports of the memristor equivalent implementation circuit and the oscillating system are sequentially connected, the memristive system implemented does not have a balance point, can generate hidden oscillation phenomena of point attractors, periodic limit cycles, quasi-periodic limit cycles, chaotic attractors and hyper-chaotic attractors, etc., and can generate a hidden multi-attractor coexistencephenomenon of different periodic limit cycles or weak chaos and periodic limit cycles of a topological structure under different initial conditions, indicating that signals generated by a signal source have richer and more complex nonlinear dynamic characteristics. The system circuit facilitates circuit implementation and experimental observation, and is a new key signal generation circuit for chaotic secure communication.

The invention relates to the chaotic laser field, and specifically relates to a semiconductor chaotic laser integrated with double feedback. The semiconductor chaotic laser integrated with double feedback solves the technical problems that a current chaotic laser generation apparatus is large in volume, is easy to be influenced by the environment, and is unstable in outputting. The semiconductor chaotic laser utilizes double feedback to improve the chaotic bandwidth of an integrated device to make the frequency spectrum to be more flat. For the semiconductor chaotic laser, a double-cavity structure eliminates the fixed time delay of a common single-cavity integrated laser chip; the double feedback cavity are similar in length but are different so that the time delay characteristic of the single-cavity integrated laser is thoroughly eliminated; the security for chaotic communication, the accuracy for chaotic laser ranging, and the randomness of the randomized number are improved; and the semiconductor chaotic laser can be applied to the communication field, the remote sensing field, the sensing field and the like. The semiconductor chaotic laser integrated with double feedback only uses a DFB laser chip, a high performance photoelectric detector and a plane lens fiber to realize chaotic output and detection, and can realize simultaneous output of a chaotic laser signal and a chaotic electric signal. The semiconductor chaotic laser integrated with double feedback also has the advantages of being small in the volume of the integrated structure and being low in cost.

Provided is an image encryption algorithm based on dynamic DNA coding and double chaotic mapping, comprising two portions one portion scrambling row pixel positions of images through a chaotic sequence generated by Lorenz chaotic mapping, meanwhile, Lorenz chaotic mapping being used as basis for dynamically selecting DNA operation rules; and the other portion scrambling row pixel values of images through Chen chaotic mapping and DNA coding. Finally, the image encryption algorithm is obtained through the combination of the two portions, and can encrypt images of any sizes.

The invention discloses a chaotic swarm intelligent optimization high-precision optimal soft measuring instrument for a propylene polymerization production process. The instrument comprises a propylene polymerization production process, a field intelligent instrument, a control station, a DCS database storing data, an optimal soft measuring model optimizing a chaotic least square support vector machine based on an improved gravitational search algorithm, and a melt index soft measurement value display, wherein the field intelligent instrument and the control station are connected with the propylene polymerization production process and are connected with the DCS database, the optimal soft measuring mode is connected with the DCS database and the soft measurement value display, and the optimal soft measuring model optimizing the chaotic least square support vector machine based on the improved gravitational search algorithm comprises a data preprocessing module, a chaotic analysis module, a least square support vector machine module, a model update module, and an improved gravitational search algorithm optimization module. The optimal soft measuring instrument for the propylene polymerization production process realizes swarm intelligent optimization, high-precision chaos forecast.

The present invention relates to digital modulation and demodulation of wireless communications, more particularly to a differential chaotic shift keying modulation and demodulation device based on the code subscript modulation. The modulation and demodulation device is provided with a modulator and a demodulator, wherein the modulator is provided with a chaotic carrier generator G; a delay unit D1; a multiplier a; a multiplier b; a bit-to-symbol converter f; a bit-to-symbol converter g; a Walsh code selector S; a square-wave generator e and a modulator transfer switch Q1; and the demodulator includes a receiver R; a delay unit D2; M square-wave generators S<1>, S<2>, ..., S<M>; M first-path multipliers M<1, 1>, M<1, 2>, ..., M<1, M>; M second-path multipliers M<2, 1>, M<2, 2>, ..., M<2, M>; M accumulators Ac<1>, Ac<2>, ..., Ac<M>; M absolute value pickers Ab<1>, Ab<2>, ..., Ab<M>; a comparator C; a demodulator transfer switch Q2; a resolver h and a symbol-to-bit converter k.