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77 results about "Synchronization of chaos" patented technology
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Synchronization of chaos is a phenomenon that may occur when two, or more, dissipative chaotic systems are coupled. Because of the exponential divergence of the nearby trajectories of chaotic systems, having two chaotic systems evolving in synchrony might appear surprising. However, synchronization of coupled or driven chaotic oscillators is a phenomenon well established experimentally and reasonably well-understood theoretically.
Spread Spectrum Communications System and Method Utilizing Chaotic Sequence
ActiveUS20080304666A1Minimize timing difference uncertaintyMinimize the differenceMultiplex code generationSecuring communicationCommunications systemNumbering system
A method is provided for generating a coherent chaotic sequence spread spectrum communications system. The method includes phase modulating a carrier with information symbols. The method also includes generating a string of discrete time chaotic samples. The method further includes modulating the carrier in a chaotic manner using the string of discrete time chaotic samples. Each of the discrete time chaotic samples has a shorter sample time interval than the duration of the information symbols. The generating step includes selecting a plurality of polynomial equations. The generating step also includes using residue number system (RNS) arithmetic operations to respectively determine solutions for the polynomial equations. The solutions are iteratively computed and expressed as RNS residue values. The generating step further includes determining a series of digits in the weighted number system based on the RNS residue values. The method further includes synchronizing the chaos generated at the receiver with that generated at the transmitter without periodic transfer of state update information.
Owner:HARRIS CORP
No-time-delay flat-frequency-spectrum broadband photon integrated chaos semiconductor laser
ActiveCN104158085ASpectrum flatFlat outputLaser detailsLaser optical resonator constructionFrequency spectrumTime delays
The invention relates to a semiconductor laser, in particular to a no-time-delay flat-frequency-spectrum broadband photon integrated chaos semiconductor laser which solves the problems that chaos lasers generated by an existing semiconductor laser have the time delay characteristic, the signal band width is small, and the frequency spectrum is not flat. The no-time-delay flat-frequency-spectrum broadband photon integrated chaos semiconductor laser comprises a chip substrate, an optical waveguide, an erbium-doped passive optical waveguide, a left distributed feedback semiconductor laser chip, a no-isolation two-way amplified semiconductor light amplification chip, a right distributed feedback semiconductor laser chip and a high-speed photoelectric detection chip. The no-time-delay flat-frequency-spectrum broadband photon integrated chaos semiconductor laser is suitable for the fields of synchronization of chaos, secrecy light communication, high-speed random number secret key generation, laser radar, optical fiber network fault detection, ultra broadband technology, distributed optical fiber sensing and the like.
Owner:GUANGDONG UNIV OF TECH
Method for generating variable parameter chaos signal and chaos secret communication system
InactiveCN101394266AIncreased complexityDefense analysisSecuring communicationComplex mathematical operationsCiphertextNonlinear prediction
The invention discloses a method for generating a variable parameter chaotic signal, and a chaotic secure communication system. The method comprises the following steps: firstly, chaotic mapping is used to generate the chaotic signal; then a parameter set of the chaotic mapping is determined in advance, so as to process any pseudorandom signal, and enable the state of the pseudorandom signal and the elements of the parameter set to be in one-to-one correspondence; and a corresponding parameter is chosen to generate the variable parameter chaotic signal by chaotic mapping according to the state of the pseudorandom signal. The system comprises a chaotic signal generating module, an analog-to-digital conversion module, a parameter transformation module, a coding module, a multi-path choice switch, an encryption / decryption module, an encrypted message data cache, a plaintext data cache and a control module. The invention can increase the complexity of the output of the chaotic signal or a chaotic sequence, and effectively resist the analysis of the nonlinear prediction technology based on phase-space reconstruction. The output digital chaotic sequence can be taken as a pseudorandom number sequence or key stream to encrypt data; the output continuous chaotic signals can be used for designing a secret communication system based on chaos synchronization .
Owner:HUAZHONG UNIV OF SCI & TECH
Passive mode-locking fiber laser delay feedback chaotization system based on graphene
InactiveCN101944990AImprove competitivenessGood development prospectsLaser detailsElectromagnetic transmission optical aspectsMode locked fiber laserFiber coupler
Owner:JILIN UNIV
Classified passive optical network based on synchronization of chaos
InactiveCN103260095AIncrease system capacityImprove securityMultiplex system selection arrangementsFibre transmissionCarrier signalOptical communication
The invention discloses a classified passive optical network based on synchronization of chaos, and belongs to the technical field of classified optical communication. N pairs of semiconductor lasers with the same operating wavelength are adopted at two ends of an OLT and two ends of an optical network unit to serve as a chaotic carrier wave generator. Uplink information and downlink information are respectively loaded to n chaotic carrier waves with different wavelengths through an optical modulator to achieve information chaotic encryption, up-load and down-load are carried out through optical fibers after combination by adopting a wavelength-division multiplexing technology, and at last information decryption is achieved by adopting a chaotic carrier wave with the same wavelength. An all-optical chaotic signal is used as a carrier wave and combined with the wavelength-division multiplexing technology to carry out classified transmission on uplink information and downlink information, information security of the passive optical network is improved from a physical layer, the classified passive optical network based on synchronization of the chaos is suitable for a communication service with high requirements in information confidentiality, and reference significance is provided to improve safety of the passive optical network.
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA
Chaos synchronization encrypting/decrypting method and device using data compression encoding
ActiveCN102904717AImprove encryption securityKey distribution for secure communicationPublic key for secure communicationData compressionKey size
The invention discloses a chaos synchronization encrypting / decrypting method and device using data compression encoding. The device comprises a random number generator, a public key cryptography encipher, a public key cryptography decipher, a dynamical probability counter, an entropy encoder and an entropy decoder. The method comprises the steps of taking the entropy encoder and the dynamical probability counter used for the data compression as a chaotic dynamics system; enabling a compression coding process to form a chaotic cryptology encryption process; combining the public key cryptography encipher with the chaotic dynamics system, wherein after a randomly generated session key is encrypted in an asymmetrical encryption manner by a sender, the session key is sent to a receiver; initializing the respective chaotic dynamics system through the respective session key the sender and the receiver so that the system states of the sender and the receiver are synchronous; carrying out data compression encoding through the initialized system by the sender; and carrying out data uncompressing through a system with consistent state by the receiver. The method and the device provided by the invention support overlong session key and improve the encryption safety; and simultaneously, the encryption speed is not affected by the key length.
Owner:SOUTH CHINA UNIV OF TECH
High-speed key distribution device based on semiconductor laser chaos synchronization
ActiveCN109672533AEnsure safetyImprove securitySynchronising transmission/receiving encryption devicesSecuring communication by chaotic signalsSequence controlEngineering
The invention provides a high-speed key distribution device based on semiconductor laser chaos synchronization. The high-speed key distribution device based on semiconductor laser chaos synchronization comprises a central control module and a user module; the central control module adjusts the feedback intensity and the polarization state of feedback light; chaotic signals can be output in two linear polarization modes of a driving laser; the user module respectively injects the chaotic signals generated by the driving laser into two response lasers; the two response lasers are each subjectedto polarization adjustable light feedback; the polarization state of the feedback light can be realized through an adjustable polarization controller controlled by two random bit sequences generated by a random bit generator; when the polarization states of the feedback light corresponding to the two response lasers are same, the two lasers can obtain the chaotic signals having better synchronization performance; and, after two chaotic signals output by the two response lasers are respectively sampled and filtered through two analog-digital converts (ADC) and two bit filters, a shared key canbe obtained.
Owner:SOUTHWEST UNIVERSITY
Method for generating digital chaos code in chaotic secure communication system
The invention relates to a method for generating a digital chaos code in a chaotic secure communication system. The digital chaotic secure communication system comprises a channel for communication between an information sending terminal A and an information receiving terminal B and a digital chaotic network that is connected with the channel and is used for generating a chaotic digital numerical code; and a chaotic numerical code with a certain length is selected in numerical codes generated by the digital chaotic network and is converted into a chaotic code k1(t) by a code generation function g1 of chaotic coding, wherein the k1 (t) is expressed by the following formula: k1 (t)= g1 (X, p). The complex receiving and sending chaotic networks employ an identical method to carry out calculation so as to obtain a chaotic synchronous digital numerical code. A chaotic code is generated or decoded from the digital chaotic network based on chaotic code generation and a clear chaotic coding or decoding module by using the following method: a code k1 has the length of one bit or multiple bits, a certain amount P of digital construction codes are selected from chaotic numerical codes generated by the chaotic network according to a random or regular way and the k1 is expressed by the following formula: k1=g1 [X,p], wherein the p is less than or equal to the q; and a series of function bi operation is carried out on all original codes generated by the complex networks so as to generate a series of new digital functions.
Owner:SOUTHEAST UNIV
Double-permanent magnet synchronous motor chaos synchronization control method based on extended state observer
InactiveCN105846741AElectronic commutation motor controlVector control systemsSynchronous controlState observer
A double-permanent magnet synchronous motor chaos synchronization control method based on an extended state observer comprises the steps of building a chaos model of a permanent magnet synchronous motor system, defining a synchronization error system, designing a nonlinear extended state observer, and designing an adaptive sliding mode controller. Through coordinate transformation, the chaos model of the permanent magnet synchronous motor system is built, and the synchronization error system is defined. The nonlinear extended state observer is designed to estimate and compensate uncertain items and external disturbance in the system. The adaptive sliding mode controller is designed to ensure that the state error between master and slave systems is stabilized quickly and converges to zero. Finally, synchronous control of the system is realized. The influence of chaos phenomenon and external disturbance in the system is compensated, the chattering problem of the traditional sliding mode control method is improved, the robustness of the system is enhanced, and chaos synchronization control of a double-permanent magnet synchronous motor system is realized.
Owner:ZHEJIANG UNIV OF TECH
Spread spectrum communications system and method utilizing chaotic sequence
ActiveUS7974413B2Minimize the differenceMultiplex code generationSecuring communicationNumbering systemCommunications system
A method is provided for generating a coherent chaotic sequence spread spectrum communications system. The method includes phase modulating a carrier with information symbols. The method also includes generating a string of discrete time chaotic samples. The method further includes modulating the carrier in a chaotic manner using the string of discrete time chaotic samples. Each of the discrete time chaotic samples has a shorter sample time interval than the duration of the information symbols. The generating step includes selecting a plurality of polynomial equations. The generating step also includes using residue number system (RNS) arithmetic operations to respectively determine solutions for the polynomial equations. The solutions are iteratively computed and expressed as RNS residue values. The generating step further includes determining a series of digits in the weighted number system based on the RNS residue values. The method further includes synchronizing the chaos generated at the receiver with that generated at the transmitter without periodic transfer of state update information.
Owner:HARRIS CORP
Nonlinear term-free chaotic signal masking-based signal encryption transmission and restoration method
InactiveCN107359983AImplement encryptionImplement decryption recoverySecuring communication by chaotic signalsComputer hardwareRestoration method
The invention discloses a nonlinear term-free chaotic signal masking-based signal encryption transmission and restoration method. According to the method, driving chaotic system signals are generated through an improved nonlinear itemize-free chaotic system; the chaotic signals and information to be transmitted are superposed, so that the information can be masked; at a receiving end, the masked information and a key are adopted to construct a response chaotic system, and a kind of responsible variable-gain synchronization laws is constructed so as to realize the state synchronization of a driving system and a response system; and the information is restored from the encrypted information by means of the synchronized state, and therefore, the encryption and decryption restoration of the information can be realized. The information encryption and decryption method provided by the present invention has high security; the variable-gain synchronization method provided by the present invention makes chaotic synchronization have high precision, so that the recovered information has the advantage of small distortion, and therefore, the whole method of the invention has a high engineering application value.
Owner:NAVAL AERONAUTICAL & ASTRONAUTICAL UNIV PLA
System and method for generating analog-digital mixed chaos signals
InactiveCN1852089AImprove securityImprove robustnessSynchronising transmission/receiving encryption devicesSecret communicationCommunications systemChaotic systems
This invention discloses a system and a method for generating A / D blend chaos signals, in which, digital chaos systems separated in different places control the continuous chaos systems of their local places, so that the systems separated in different places can work synchronously for a long time without needing to transmit synchronous drive signals, the continuous chaos systems disturb the digital chaos systems at their local places to prevent them from degenerating their characters, besides, the digital chaos sequence output by the blend chaos system can be taken as the false random number sequence or a cryptographic key flow to cipher data and the output signals can be used in designing security communication system based on chaos synchronization.
Owner:HUAZHONG UNIV OF SCI & TECH +1
Implementation method of multi-scroll chaotic attractors based on piecewise function method
InactiveCN108242995AImprove confidentialityImprove anti-interference abilitySecuring communication by chaotic signalsInformation processingConfidentiality
The invention discloses an implementation method of multi-scroll chaotic attractors based on a piecewise function method. By introducing a piecewise function, the fractional-order chaotic system is subjected to translation transformation and parameters are set, and then 2(N+1)- and 2N+1- scroll attractors are generated. The fractional-order translation chaotic system perfects the field of fractional-order chaotic systems composed of three-dimensional one-time autonomous ordinary differentials. If the parameter settings of each subsystem are changed, and the subsystem can be equivalently transformed into other existing classical chaotic system. The system can be applied in the fields of chaotic synchronization, cryptography, circuit electronics, signal transmission, information processing,etc. Compared with the existing systems, the system is characterized in that the fractional order is more complex, so the fractional order has greater confidentiality and anti-interference ability when being used in the field of signal transmission and cryptography.
Owner:CHANGCHUN UNIV OF TECH
Method for detecting weak signal frequency value in background of strong noise by chaotic synchronization
InactiveCN106685605AImplement frequency detectionImplement frequency measurementsError detection/prevention using signal quality detectorSecuring communication by chaotic signalsSignal-to-quantization-noise ratioSpectral density
The invention proposes a method for detecting a weak signal frequency value in the background of strong noise by chaotic synchronization. The method comprises the steps of firstly, constructing a chaotic synchronization signal frequency detection system, and adjusting system relevant parameters and controller parameters to allow the chaotic system run in a chaotic state at both a drive end and a response end synchronously; then, introducing a signal to be measured into the drive end of the chaotic synchronization detection system, and obtaining synchronization errors at both ends; and finally, solving the power spectral density by Fourier transform of the synchronization error data, and determining the frequency value of a weak periodic signal to be measured. According to the invention, the noise immunity and the synchronization of the chaotic system are used to suppress the large amount of noise, and the weak periodic signal to be measured is amplified. The signal-to-noise ratio of the synchronization error data is greatly improved compared with the signal to be measured, and the detection capability of the weak periodic signal frequency value in the background of strong noise is effectively improved.
Owner:SOUTH CHINA UNIV OF TECH
GCCS judgment method of three-node VCSEL network under delay coupling
InactiveCN108809621ASolve decision puzzlesRing-type electromagnetic networksModulated-carrier systemsVertical-cavity surface-emitting laserRate equation
The invention discloses a GCCS judgment method of a three-node VCSEL network under delay coupling. The method comprises the following steps: giving out a delay-coupled VCSEL network composed of threesame nodes, and a dynamic equation of the network; giving the outer coupling matrix and unitary matrix assumption under the dynamic equation of the network; determining a rate equation expression of i-VCSEL in the three-node VCSEL network, determining a dynamic equation of the synchronization manifold, and determining a master stability equation; computing three maximum Lyapunov indexes; judging the stability of the synchronization state of the three-node VCSEL network and whether the synchronization manifold of the network is chaotic waveform. For various three-node vertical cavity surface emitting laser (VCSEL) networks with same time delay coupling, a new judgment method capable of achieving globally complete chaos synchronization (GCCS) among all node lasers is proposed through the master stability function (MSF), and a judgment problem of the GCCS in the VCSEL network is solved.
Owner:WUYI UNIV
High-speed random number generating system based on chaos network
InactiveCN103716149AHigh speed outputEasy to put inSecuring communicationFrequency spectrumParallel algorithm
The invention provides a high-speed random number generating system based on a chaos network. The high-speed random number generating system comprises the digital chaos network, one or more random code registers connected with the digital chaos network, and one or more data interfaces connected with the random code registers. The parallel algorithm technology and the assembly line technology are adopted for the digital chaos network, random codes or pseudo-random codes generated among nodes of the digital chaos network are coupled, the frequency spectrum of the chaos network is broadened, and therefore the number of random codes of each digital variable of the digital chaos network is increased, and low-order random codes are obtained. The random codes of all the variables or a part of the variables of the digital chaos network are taken out and encoded according to a random arraying method to form high-speed random number sequence codes, and the high-speed random number sequence codes are outputted through the random code registers connected with the digital chaos network and through the data interfaces connected with the random code registers. By means of the random number generating system, random codes at the speed of more than Tbits / s can be generated, and the high-speed random number generating system can be used for encryption of high-speed information and used for decryption of information through chaotic synchronization.
Owner:SOUTHEAST UNIV
Chaotic secret communication system based on digital chaotic coding algorithm
A chaotic secret communication system based on a digital chaotic coding algorithm comprises (1) a channel used for enabling an information sending end A to be communicated with an information receiving end B and (2) digital chaotic networks connected with the channel and used for generating chaotic numerical codes. A function g1 is generated through codes of chaotic coding according to the selected chaotic numerical codes with certain lengths from the numerical codes generated in the digital chaotic networks and converted to a chaotic code k1(t), wherein an equation that k1(t)=g1(X, p) is satisfied. The digital chaotic networks are characterized in that (1) the digital chaotic networks are identical in topologic and dynamics structures, driven by common signals and in a chaotic synchronic state, the digital chaotic networks comprise a complex chaotic network which is of a random topologic structure, a regular network, a random network, a small-world network, a freedom scaling network and a module network; (2) the information sending end A is used for complex chaotic networks which generate the chaotic numerical codes and a kinetic equation is decrypted by a differential kinetic equation.
Owner:SOUTHEAST UNIV
Lorenz chaotic synchronization method based on intelligent gain feedback adjustment
InactiveCN105959095AEasy to implementSecuring communication by chaotic signalsChaotic systemsCalculation error
The invention discloses a Lorenz chaotic synchronization method based on intelligent gain feedback adjustment. By using the measurement information of a Lorenz driving chaotic system and a response system, an error system is formed, then a synchronization rule is formed by the intelligent gain feedback adjustment of an error, and finally the synchronization of an uncertain Lorenz driving chaotic system and a response chaotic system is realized. The method comprises the steps of (1) measuring the state information x1, y1 and z1 of the Lorenz driving chaotic system and constructing a driving chaotic system, (2) measuring the state information x2, y2 and z2 of a Lorenz response system and constructing the response chaotic system, (3) constructing a virtual error systems ex, ey and ez and calculating the states e1, e2 and e3 of the error system, and (4) constructing error feedback synchronization control rules u1, u2 and u3, and designing related coefficients. The invention provides the Lorenz chaotic synchronization method based on the intelligent gain feedback adjustment, and the scheme is simple to realize by only using the state error information of a driving response system.
Owner:YANTAI UNIV
Injection type chaotic vertical surface laser-based bidirectional communication system
ActiveCN110071412ALow costImprove performanceLaser detailsSecuring communication by chaotic signalsConfidentialityTime delays
The invention belongs to the technical field of optical information, and particularly relates to an injection type chaotic vertical surface laser-based bidirectional communication system. The system comprises a driving laser which is used for generating chaotic signals, the chaotic signals are divided into two paths of signals after passing through a neutral-density filter and an optical isolator,and the two paths of signals are respectively injected into two subordinate lasers after respectively passing through the optical isolator and a polarized half-wave plate, so as to generate chaotic synchronization; the outer cavities of both the driving laser and the subordinate lasers pass through the polarized half-wave plates, the optical signals in the horizontal direction are utilized to carry out phase modulation on the optical signals in the vertical direction, and feedback is formed; and chaotic optical signals of the subordinate lasers are divided into two paths of signals, one pathof signals communicate with a reception end through an optical fiber and the other path of signals are used for detection of a photoelectric detector. According to the constructed injection type chaotic vertical surface laser-based bidirectional communication system, chaotic communication is realized by utilizing an optical device, so that the time delay of feedback is hidden and the system has the characteristics of being low in cost, stable in performance and high in confidentiality.
Owner:浙江知多多网络科技有限公司
Improved permanent magnet synchronous motor chaos synchronization control method
ActiveCN110266217AChaotic Synchronization ImplementationMultiple motor speed/torque controlLyapunov stabilityMathematical model
Owner:QILU UNIV OF TECH +1
Secure communication system based on silicon photon chaos source
InactiveCN107566108AImprove stabilityMiniaturizationSecret communicationPhotonic quantum communicationEngineeringPhoton
Owner:SOUTHWEST UNIVERSITY
System and method for generating analog-digital mixed chaos signals
InactiveCN1852089BImprove securityImprove robustnessSynchronising transmission/receiving encryption devicesSecret communicationCommunications systemChaotic systems
This invention discloses a system and a method for generating A / D blend chaos signals, in which, digital chaos systems separated in different places control the continuous chaos systems of their local places, so that the systems separated in different places can work synchronously for a long time without needing to transmit synchronous drive signals, the continuous chaos systems disturb the digital chaos systems at their local places to prevent them from degenerating their characters, besides, the digital chaos sequence output by the blend chaos system can be taken as the false random numbersequence or a cryptographic key flow to cipher data and the output signals can be used in designing security communication system based on chaos synchronization.
Owner:HUAZHONG UNIV OF SCI & TECH +1
Distributed synchronous control method of multi-motor network system
InactiveCN110932607AThe distributed control method is correct and effectiveCoupling strength is smallElectronic commutation motor controlVector control systemsComputer networkSynchronous control
The invention provides a distributed synchronous control method of a multi-motor network system, and belongs to the technical field of synchronous control of the multi-motor network system. Accordingto the invention, the appointed connecting edges are added or removed on the basis of the original connecting network, so that a plurality of appointed nodes have the same adjacent nodes, a symmetrical structure is presented in the whole network, and the nodes are regarded as a group of cluster network nodes, thereby researching the chaotic synchronization of the group of cluster network nodes. According to the method, local synchronization of a plurality of motor nodes in the multi-motor system can be realized, the method is correct and effective, and the coupling strength of the method is smaller than that of global synchronization.
Owner:GUANGXI NORMAL UNIV
Generalized synchronization method for controlled Rucklidge system and Genesio-Tesi system for encryption and decryption
InactiveCN109245888AImprove smoothnessEasy to implementSynchronising transmission/receiving encryption devicesSecuring communication by chaotic signalsState spaceInput control
The invention discloses a generalized synchronization method for a controlled Rucklidge system and a Genesio-Tesi system for encryption and decryption. The method comprises the following steps: 1), description of a generalized chaotic synchronization problem; 2), state transformation and feedback of a response system; 3), state transition of a drive system; 4), generalized synchronization. The invention provides the generalized chaotic synchronization method for the controlled Rucklidge system and the Genesio-Tesi system for encryption and decryption. The Genesio-Tesi chaotic system is used asthe drive system, and the single-input controlled Rucklidge system is used as the response system. A state space transition method is used for designing the chaotic synchronization method, thereby achieving generalized synchronization and high control quality.
Owner:ZHEJIANG UNIV OF TECH
Method for synchronizing laser chaos pulses
InactiveCN102571322AImprove securityIncrease the difficultySecuring communicationPower flowChaotic systems
The invention provides a method for synchronizing laser chaos pulses, which specifically comprises the steps of converting an optical chaos signal P1 and an optical chaos signal P2 generated by a transmitting terminal and a receiving terminal respectively into an electrical signal E1 and an electrical signal E2 and sampling the electrical signal E1 and the electrical signal E2; using a sampling value of the electrical signal E2 to decrease a sampling value of the electrical signal E1 and then multiply by coupling coefficient K to obtain a feedback signal of the transmitting terminal, and feeding the feedback signal back to the transmitting terminal to modulate the working current of a laser device of the transmitting terminal; and repeating the modulating steps till signals of the transmitting terminal and the receiving terminal are synchronized. The method for synchronizing the laser chaos pulses uses a pulse synchronization mode, the quantity of chaos signals transmitted in a channel is much less than the quantity of chaos signals transmitted by means of a common chaos synchronization method, and a chaos system is difficultly recovered through intercepted pulse signals if the signals are intercepted, thereby effectively improving safety of secret communication.
Owner:HUAZHONG UNIV OF SCI & TECH
A generalized chaotic synchronization method for controlled Rucklidge system and Lorenz system applied to secure communication is presented
InactiveCN109039633AImprove smoothnessEasy to implementSynchronising transmission/receiving encryption devicesSecuring communication by chaotic signalsSecure communicationLie derivative
A generalized chaotic synchronization method of a controlled Rucklidge system and a Lorenz system applied to secure communicationcomprises the following steps: 1) description of the generalized chaotic synchronization problem; 2) state transformation and feedback of the response system; 3) state transition of driving system; 4) Generalized synchronization. The invention provides the generalized chaotic synchronization method of a controlled Rucklidge system and a Lorenz system applied to secure communication, with Taking Lorenz system as driving system and single input controlled Rucklidge system as response system, a chaotic synchronization algorithm is designed by using Lie derivative method of vector field in differential geometry, which realizes generalized synchronization and high control quality.
Owner:ZHEJIANG UNIV OF TECH
Lorentz 10+4 chaotic secret communication circuit
ActiveCN105610573AStable jobSmall distortionSecuring communication by chaotic signalsAsynchronous circuitEngineering
The invention discloses a Lorentz 10+4 chaotic secret communication circuit, comprising a transmitting system circuit and a receiving system circuit, wherein the transmitting system circuit is connected with the receiving system circuit via a channel, the transmitting system circuit comprises a first signal summing circuit A and a first three-order Lorentz 10+4 circuit B, and the receiving system circuit comprises a second signal summing circuit C and a second three-order Lorentz 10+4 circuit D; the first signal summing circuit A is connected with the first three-order Lorentz 10+4 circuit B, and the second signal summing circuit C is connected with the second three-order Lorentz 10+4 circuit D. The Lorentz 10+4 chaotic secret communication circuit and a jumper pin set constitute an experimental controllable Lorentz 10+4 chaotic secret communication circuit. The Lorentz 10+4 chaotic secret communication circuit is simple in structure, and can be used for all chaotic synchronous and asynchronous circuit experiments.
Owner:HEXI UNIV
Delay-free, spectrally flat, broadband photonic integrated chaotic semiconductor laser
ActiveCN104158085BSpectrum flatFlat outputLaser detailsLaser optical resonator constructionFrequency spectrumTime delays
The invention relates to a semiconductor laser, in particular to a no-time-delay flat-frequency-spectrum broadband photon integrated chaos semiconductor laser which solves the problems that chaos lasers generated by an existing semiconductor laser have the time delay characteristic, the signal band width is small, and the frequency spectrum is not flat. The no-time-delay flat-frequency-spectrum broadband photon integrated chaos semiconductor laser comprises a chip substrate, an optical waveguide, an erbium-doped passive optical waveguide, a left distributed feedback semiconductor laser chip, a no-isolation two-way amplified semiconductor light amplification chip, a right distributed feedback semiconductor laser chip and a high-speed photoelectric detection chip. The no-time-delay flat-frequency-spectrum broadband photon integrated chaos semiconductor laser is suitable for the fields of synchronization of chaos, secrecy light communication, high-speed random number secret key generation, laser radar, optical fiber network fault detection, ultra broadband technology, distributed optical fiber sensing and the like.
Owner:GUANGDONG UNIV OF TECH
Signal generator based on chaotic synchronization and anti-synchronization switching
InactiveCN106130715AImprove confidentialityGood synchronizationSecuring communication by chaotic signalsData synchronizationElectronic switch
The invention discloses a signal generator based on chaotic synchronization and anti-synchronization switching. The signal generator comprises a driving unit, a parameter correction unit, a synchronization and anti-synchronization switching unit and a response unit. System parameters of the driving unit are unknown, and the driving unit is used for generating a chaotic driving signal based on a three-dimensional Qi system; the parameter correction unit is used for adaptively correcting the system parameters of the driving unit and the response unit according to the chaotic driving signal and a signal fed back by the response unit; the synchronization and anti-synchronization switching unit is used for controlling the response unit and the driving unit to be in a synchronization state or an anti-synchronization state according to a control instruction; and the response unit is a four-dimensional hyper-chaotic Lu system and is used for implementing synchronization or anti-synchronization with the driving unit under the control of the synchronization and anti-synchronization switching unit. According to the signal generator disclosed by the invention, adaptive synchronization and anti-synchronization control can be implemented on the three-dimensional Qi system and the four-dimensional hyper-chaotic Lu system with the unknown parameters, and rapid switching of synchronization and anti-synchronization is carried out on two systems by utilizing an electronic switch.
Owner:YULIN NORMAL UNIVERSITY
Audio frequency watermark algorithm based on chaos system
InactiveCN105374361AThe embedding position is accurateGood synchronizationSpeech analysisSecuring communication by chaotic signalsAudio watermarkChaotic systems
The invention discloses an audio frequency watermark algorithm based on a chaotic system, comprising steps of utilizing a related general chaos synchronization theorem to construct a new chaos synchronization system on the basis of an existing chaotic system, and applying a chaos series generated by the chaos synchronization system into a digital watermark after a series of processing. The audio frequency watermark algorithm disclosed by the invention can better prevent illegal manipulation and copy of the digital product. The algorithm appropriately applies the chaos sequence generated by the chaos synchronization system into the watermark embedding and detection. The audio frequency watermark algorithm not only improves the robustness of the audio frequency, but also accurately positions the embedding position of the watermark information, which improves the synchronization of the watermark information.
Owner:GUANGDONG UNIV OF PETROCHEMICAL TECH
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