153 results about "Carrier modulation" patented technology

The invention discloses an earthquake early warning device and method based on campus broadcast, and the method comprises the steps: carrying out the building response coupling analysis through receiving an early warning signal of an earthquake monitoring center, generating an earthquake magnitude-building coupling feature, and mapping the earthquake magnitude-building coupling feature into an enhanced early warning source adaptive to an acoustic environment; acoustic cavity detection is carried out based on threatened area identification, and differential playing topology is constructed; extracting a high-risk gathering area through personnel density scanning, generating personalized evacuation guiding content and determining a playing priority; high-precision time sequence control is realized by adopting a synchronous reference anchor point technology, and a multi-mode playing domain is constructed through carrier modulation and frequency division multiplexing; and finally, an acoustic navigation field is utilized to guide accurate scheduling and playing of audio signals, differential playing and accurate coverage of early warning information can be realized according to the anti-seismic characteristics and acoustic environment characteristics of different buildings, and an intelligent acoustic solution is provided for campus earthquake early warning.

The invention relates to the technical field of artificial intelligence, and provides a network intrusion detection method based on multidimensional feature collaborative analysis, and the method comprises the steps: calculating the correlation degree eta ij of any two feature columns in an original traffic feature matrix, and when eta ij is greater than eta thr, generating a new feature through Qij = Xi * Xj + (1-eta ij) * (Xi + Xj), outputting a dimension reduction feature matrix to perform nonlinear spatial transformation on the dimension reduction feature matrix X ', dynamically retrieving associated knowledge through a learnable memory library, fusing current input features and memory enhancement features, and outputting refined features; decomposing the refined features to a biological neural oscillation frequency band, applying carrier modulation, and performing feature reconstruction to generate a space-time correlation tensor; the refined features and the space-time correlation tensor are fused, and the intrusion behavior classification probability is output through multi-stage abstract compression and regularization processing; screening difficult samples based on classification confidence to construct a training library, and obtaining a conventional detection model and a special and precise detection model; and preferentially calling the special and precise model during real-time detection, and switching to the conventional model when the confidence coefficient is smaller than a confidence coefficient threshold value.

The invention provides a phase-sensitive optical time domain reflectometer system and method, and the system comprises a first polarization-maintaining coupler which is used for dividing laser generated by a DC laser, and obtaining first laser and second laser; the optical fiber measurement front-end module is used for processing the random signal through pulse shaping and multi-carrier modulation technologies to generate an electric signal, and sequentially performing modulation, amplification, Rayleigh scattering and amplification on the first laser after the electric signal is generated to obtain amplified Rayleigh backscattered light; the second polarization-maintaining coupler is used for dividing the second laser to obtain third laser and local oscillation light; the delay optical fiber is used for processing the third laser to obtain delay light; the third polarization-maintaining coupler is used for combining the delayed light and the amplified Rayleigh backscattered light to obtain combined light; the receiver is used for processing the combined light and the local oscillation light to obtain multiple paths of target electric signals; and the oscilloscope is used for processing multiple paths of target electric signals through low-pass and high-pass filters and a phase noise compensation algorithm so as to determine power and phase distribution. The system cost can be reduced.

The invention discloses an electric energy quality optimization method and system based on carrier modulation, and relates to the field of electric energy quality optimization, and the method comprises the steps: obtaining bridge arm information of a distributed energy storage type electric energy quality controller, and determining a carrier amplitude adjustment strategy; determining a target zero-sequence component needing to be injected through carrier characteristics based on the carrier amplitude adjustment strategy; according to the target zero-sequence component, performing superposition on the original modulation wave to generate a target modulation wave; adjusting the power of the power grid based on the target modulating wave, and carrying out dynamic compensation on the capacitance voltage deviation; the harmonic suppression capability is improved, and the power distribution dynamic response efficiency is enhanced, so that the optimization of the electric energy quality is realized, and the problem that the real-time performance and the reliability of the electric energy quality regulation are reduced due to the limitation of harmonic compensation and the lack of real-time dynamic response in the conventional pulse width modulation method is solved.

The invention relates to the field of cloud edge cooperative scheduling, and discloses a communication network resource management system and method based on intelligent scheduling, and the method comprises the steps: carrying out the phase separation domain splitting processing of a real-time communication trace, scattering the carrier wave off-modulation texture, the edge channel congestion emergence sequence and the micro-burst session cluster to a plurality of dynamic interaction cavities; under the guidance of the time-varying disturbance skeleton diagram, performing reverse stitching and rhythm bias turn-back on the cloud edge response loop, and writing the cloud edge response loop into an instantaneous cache loop of an edge node; identifying a cloud edge response loop and constructing a self-adjusting sequence factor through signal folding disorder in an error frequency recursion layer; based on a time sequence reconstruction pattern in a transition state regulation and control domain, mapping each edge node into a potential distribution factor matrix; and when the intelligent scheduling chain track enters the stable plastic transition window, performing lamination fusion calculation processing on the transition state regulation and control domain. The method has the advantage of improving the utilization rate of network resources.

The invention provides a seismic data bidirectional frequency band expansion method based on carrier modulation, which relates to the field of seismic exploration, and comprises the following steps: processing original seismic data through time window segmentation, calculating an autocorrelation function and carrying out time domain continuation; solving a prediction coefficient based on entropy maximization constraint to generate an amplitude spectrum; calculating a boundary attenuation rate through boundary frequency point positioning; constructing an attenuation compensation function to generate a frequency domain carrier function; applying sparse constraint to solve a weighting factor and iteratively calculating a modulation amplitude spectrum; and finally, carrying out combined inverse transformation with an original phase spectrum to obtain expanded data. According to the method, the resolution and the signal-to-noise ratio of the seismic data are effectively improved, and the seismic interpretation precision is improved.

The invention belongs to the technical field of power electronics, and provides a multi-degree-of-freedom general carrier modulation method and system for a current source converter, and the method comprises the steps: constructing a modular cascade current source converter; a sine pulse width sequence is output through carrier modulation to analyze direct-current side voltage harmonic distribution in the constructed modular cascade current source type converter; determining the optimal phase shift angle of the modular cascade current source type converter by taking the sine pulse width sequence waveform quality, the switching frequency and the DC voltage performance optimization as optimization targets according to the distribution result of the DC side voltage harmonic waves; and adjusting the three-phase carrier wave of each current source module in the current source type converter based on the determined optimal phase shift angle, and completing multi-degree-of-freedom general carrier wave modulation of the current source type converter.

The invention discloses a direct-current ship power grid fault flexible ride-through method based on zero-sequence current injection, which belongs to the technical field of direct-current ship power grid fault protection, and comprises the following steps: when a switch fault is detected, positioning the position of a fault switch; calculating the degree of asymmetry of the direct-current voltage according to the output voltage requirement of the inverter; the direct-current voltage asymmetry degree serves as input, the rectifier is controlled through carrier amplitude modulation and zero-sequence component injection, and asymmetric direct-current voltage is output; the method comprises the following steps of: determining locking and conducting switches when different switch faults occur, and controlling an inverter to realize generation of separated alternating-current phase voltage and optimal zero-sequence component injection through two-level carrier modulation according to asymmetric direct-current voltage so as to complete flexible fault ride-through of the frequency converter. By adopting the method, the processes of capacitor discharge, energy feedback and the like in the fault period are adjusted through the control factors, system instability and equipment reverse rotation are prevented, and continuous power supply and operation safety of a ship power grid are guaranteed.

The present application provides a high-power semiconductor light-emitting chip with longitudinal carrier modulation and a manufacturing method therefor. The high-power semiconductor light-emitting chip with longitudinal carrier modulation includes: an active layer; a first semiconductor cell layer disposed on the active layer, wherein the first semiconductor cell layer includes a contact doped layer, the first semiconductor cell layer includes a plurality of current blocking regions that are disposed at least in the contact doped layer and distributed in a slow-axis direction, and the parts of the first semiconductor cell layer between neighboring current blocking regions act as current injection regions, wherein a current density function J(z) of current density in the active layer satisfies:J⁡(z)=(Jop-J0)·f⁡(z)+J0;f⁡(z)=Np(z)1L·∫L0Np(z)⁢dz;whereinJ0=α⁢N0+bN02+cN03,N0=Ntr⁢exp⁡(αi+amΓ⁢g0);and an average resistivity r(z) of corresponding current injection regions and current blocking regions at any position in the cavity-length direction satisfiesr⁡(z)=r0·1f⁡(z)+J0 / (Jop-J0),where r0 is a coefficient of r(z).

The invention relates to the related field of a wireless communication technology, in particular to a directional sound propagation method for an interphone loudspeaker, which realizes directional sound propagation, reduces noise pollution, has stronger confidentiality due to the fact that sound cannot be diffused all around, and realizes directional sound propagation of the interphone loudspeaker through an ultrasonic carrier modulation technology. According to the invention, sound directional propagation is realized on the basis of original hardware of a common interphone, the whole machine does not need to be reconstructed, the limitation that a traditional directional loudspeaker needs special hardware is broken through, the technical path is novel, and the realization cost of a directional propagation function is greatly reduced; and large-scale popularization and application of common interphones are facilitated.

The application discloses a B3I signal simulation method and device, terminal equipment and storage medium, through obtaining ephemeris data, generating pseudo code and extension code, and modulating the same, a real B3I signal can be quickly and accurately generated. In this way, the original signal simulation can be freed from the dependence on hardware equipment, and only ephemeris data provided by a user and satellite messages of a Beidou satellite are needed to generate a corresponding B3I signal. In addition, a Doppler frequency shift is calculated according to the distance between a satellite and the user, and is applied to carrier modulation, so that the B3I signals of various satellites can be more accurately simulated. By comprehensively considering ephemeris data, distance calculation, pseudo code generation, Doppler frequency shift and navigation messages and the like, a real B3I signal with a Doppler effect can be generated, which provides a beneficial tool and data for testing and verification of a B3I signal receiver, so that the research and development efficiency of a navigation satellite signal receiver is improved.

The application provides a signal predistortion processing method and device, electronic equipment and storage medium, and relates to the technical field of communication. The method comprises the following steps: firstly, calculating predistortion complex array by a memory polynomial model based on historical baseband data and historical baseband feedback data; then, applying the predistortion complex array to a baseband signal to generate an in-phase component signal and a quadrature component signal containing amplitude and phase predistortion information; then, respectively performing carrier modulation on the in-phase component signal and the quadrature component signal to obtain an in-phase branch signal and a quadrature branch signal; then, calculating a predistortion real signal based on the in-phase branch signal and the quadrature branch signal; and finally, performing carrier modulation on the predistortion real signal to obtain an up-converted signal. The technical scheme provided by the application solves the technical problem that phase predistortion information cannot be preserved in the signal predistortion process.

The invention discloses a filter bank multicarrier modulation and orthogonal time-frequency modulation combined system of a low-altitude communication sensing system, and the system is characterized in that an inverse symplectic Fourier transform module is used for receiving a first sending signal of a time delay-Doppler domain, and carrying out the inverse symplectic Fourier transform of the first sending signal, and obtaining a second sending signal of a time-frequency domain; the first multi-carrier modulation module is used for performing multi-carrier modulation on the second sending signal through the filter bank to obtain a receiving signal; the communication receiving end is used for acquiring a vector estimation signal of the received signal by adopting an iterative maximum ratio combination method on the received signal; the sensing receiving end is used for acquiring an optimal sensing target parameter of the received signal by adopting a two-stage mode search algorithm on the received signal; the second multicarrier modulation module is used for carrying out multicarrier modulation on the vector estimation value through a filter bank to obtain an estimation signal of a time-frequency domain; and the symplectic Fourier transform module is used for performing symplectic Fourier transform on the estimation signal to obtain a final signal vector estimation value.

A wireless transmit / receive unit, WTRU, can select a constellation from a set of constellations corresponding to a symbol configuration for indirect carrier modulation, ICM, based on at least one constellation performance efficacy indicator, each constellation performance efficacy indicator respectively corresponding to a constellation of the set of constellations, and use the selected constellation and symbol configuration to simultaneously harvest energy and transmit data.

The invention belongs to the technical field of power distribution network communication processing, and particularly relates to a multi-device converged communication processing method for power distribution network automation. Equipment sub-signals adopt single modulation and are distributed with different frequency bands, and a multi-channel transmission scheme is established by adopting a frequency division multiplexing carrier modulation method based on a power distribution network communication system; signal modulation processing based on a power distribution network transmission environment; and respectively performing transmission optimization on the data by using the sending end and the receiving end. On the basis of the existing transmission network, the information transmission efficiency and capability, especially the capability of multi-device joint communication processing, are further enhanced.

The invention discloses an interference equalization method, device and equipment for multi-carrier modulation in a high-dynamic scene and a storage medium, and relates to the technical field of mobile communication, and the method comprises the steps: obtaining a time domain channel matrix of a time-frequency double-color dispersion channel, and determining an inversion core matrix in a minimum mean square error equalization matrix based on the time domain channel matrix; based on the sparsity structure of the inversion core matrix, decomposing the inversion core matrix to obtain a decomposition matrix; based on the time domain channel matrix, the inversion core matrix and the decomposition matrix, determining a multilayer linear equation set with minimum mean square error equalization; and solving the multi-layer linear equation set to obtain an equalization result. By means of the mode, the calculation complexity of the equalization process in the process of resisting inter-symbol interference and inter-carrier interference existing in multi-carrier modulation in a high dynamic scene is remarkably reduced, excellent performance is still kept under the extreme condition that no cyclic prefix exists or the length of the cyclic prefix is zero, and high scene adaptability and system practicability are embodied.

The application discloses a control method and system of a wideband impedance measuring device, which injects disturbance current into a grid-connected system in parallel and obtains system impedance characteristics in response to voltage. The application collects grid point voltage and output current of the wideband impedance measuring device, obtains a fundamental component of a current reference value in a rotating coordinate system by adopting voltage outer loop control, obtains a disturbance component of the current reference value in the rotating coordinate system by adopting current outer loop control, and obtains three-phase control voltage of the wideband impedance measuring device by adopting current inner loop control, voltage feedforward control and carrier modulation, so that the wideband impedance measuring device control is effectively realized.

The invention relates to the technical field of power electronic converter control, in particular to a flexible power control method and system for a multi-port direct-current and alternating-current converter. The method comprises the following steps: acquiring voltage and current data of a three-phase power grid; alpha-beta conversion is carried out according to the acquired three-phase power grid voltage and current data, and a power grid voltage orthogonal component and power relation is generated; generating double modulation waves according to the power grid voltage; calculating a battery current reference according to a power grid voltage orthogonal component and a power relation; the zero-sequence injection amount is inversely calculated according to the double modulation waves and the battery current reference; carrying out carrier modulation by using the zero-sequence injection quantity; and performing inverter driving based on the carrier modulation signal. According to the invention, continuous control of the power of the battery port can be realized without depending on duty ratio adjustment of a traditional small vector pair, and a control dead zone under a high modulation degree / low power factor is avoided.

Disclosed are a method and apparatus for synchronous switching of multiple-input demodulation comparators. The method includes receiving line signals by a plurality of combined multiple-input comparator demodulation circuits, each combined multiple-input comparator demodulation circuit receiving the line signals according to a corresponding input arrangement related to a corresponding subchannel vector of a plurality of mutually orthogonal subchannel vectors, the line signals including a superposition of a set of baseband symbols and a set of carrier-modulated symbols; generating a set of baseband subchannel outputs by combining the set of line signals according to the corresponding input arrangement; obtaining a phase-adjusted demodulation signal related to the set of carrier-modulated symbols; and generating a set of demodulated subchannel outputs by combining the set of line signals according to the corresponding input arrangement and according to the phase-adjusted demodulation signal, the phase-adjusted demodulation signal configured to constructively combine a first half cycle and a second half cycle of the carrier-modulated signals and destructively cancel the set of baseband symbols.

The application provides a multi-target user detection synchronization method, system and storage medium based on a sweep frequency spread spectrum carrier modulation technology. A transmitting end preferably constructs a Gold sequence as a spread spectrum code by using an m sequence, modulates the Gold sequence on a periodic linear sweep frequency carrier in a BPSK mode by using an S2C modulation mode, and forms a synchronization header signal with a sharp autocorrelation peak and a low cross-correlation side lobe. A receiving end preliminarily positions the synchronization header by correlation detection, and then performs a de-skew processing on the received signal, multiplies the received signal with a local linear frequency modulation reference signal, and performs a band pass filtering, so as to convert the wideband sweep frequency signal into a single frequency signal, and greatly reduce the processing complexity. On this basis, the coarse synchronization utilizes the correlation detection combined with the maximum likelihood method to preliminarily time in the time domain, and the fine synchronization finely adjusts according to the frequency characteristics of the de-skewed signal. The method can still realize the robust multi-target signal detection and high-precision positioning in a complex underwater acoustic multipath environment, and has good engineering practicability.

This invention relates to the field of smart meter communication data acquisition technology, and discloses a method for anti-interference data acquisition in smart meter communication based on multi-carrier modulation technology. The method includes using multi-carrier modulation to perform frequency division processing on the signal during data transmission, combining channel state perception and dynamic subcarrier allocation strategies to avoid interference frequency bands in real time, and enhancing data robustness through time-frequency joint coding. This application can effectively suppress narrowband interference and impulse noise, improving the communication reliability and data acquisition accuracy of smart meters in complex electromagnetic environments.

This invention proposes a ripple-optimal clamping modulation method for two parallel converters. Based on the equivalent voltage vector plane of the two parallel converters, the method divides the vector plane into multiple equilateral triangular regions according to the principle of near-three-vector synthesis. Within each equilateral triangular region, by controlling the total number of conducting switches in each of the three-phase parallel branches to vary in an increasing or decreasing manner, a set of optimal ripple vector sequences is constructed. A switching sequence is generated based on this vector sequence, and the final optimal switching sequence is determined with the goal of minimizing the peak value of single-phase circulating current. Furthermore, a carrier modulation scheme based on a combination of increasing and decreasing sawtooth carriers is constructed. According to the symmetry of the switching sequence, the configuration of the carrier and modulation wave is selected. Simultaneously, the carrier polarity is alternately configured within adjacent carrier periods to achieve symmetry of adjacent carrier periods of the switching signal. This method can effectively reduce output current ripple and suppress parallel branch circulating current, while simultaneously reducing switching losses and improving system performance.

Receiver devices for single-carrier modulation are disclosed. In particular, the receiver devices of the present disclosure are able to deal with doubly selective channels (i.e., channels varying in time and frequency). The receiver devices are configured to determine channel state information (CSI) of a communication channel and a plurality of signature roots based on the CSI. Each signature root of the plurality of signature roots is a nonzero complex point, wherein the plurality of signature roots are uniformly distributed on a circumference of a circle in a complex plane. The receiver devices are further configured to construct a first Vandermonde matrix based on the plurality of signature roots, perform a demodulation of a single-carrier modulated signal, based on the first Vandermonde matrix, to obtain a demodulated signal, and obtain symbols based on performing an iterative procedure on the demodulated signal.

The invention discloses an interference technical scheme based on GMSK signal characteristics, and relates to the technical field of wireless communication interference. According to the scheme, firstly, differential coding is carried out on a binary random code to obtain a relative code, then a GMSK baseband signal is generated through GMSK modulation, and carrier modulation is carried out; the method is characterized in that a self-adaptive phase modulation forwarding interference signal generation mechanism is designed based on the characteristics of constant envelope and continuous phase change of GMSK signals, and interference signals are generated by constructing a time-varying amplitude disturbance model, a dynamic time delay model and an interference phase model; and finally, superposing the interference signal with the GMSK signal passing through the Gaussian white noise channel to realize effective interference on the GMSK communication signal. According to the method, the GMSK signal characteristics are fully utilized, the interference pertinence is high, the interference effect on a GMSK communication system can be remarkably improved, the interference parameters can be flexibly adjusted according to actual scenes, and the applicability is wide.

The application relates to an all-fiber variable carrier laser sound field measuring device and a variable carrier modulation method, and relates to the technical field of laser application. The device comprises a main laser, a third fiber coupler, a fiber attenuator, a second fiber coupler, a balanced photoelectric detector, a signal acquisition card and an industrial computer; the third fiber coupler is further connected with an optical phase-locked loop; the optical phase-locked loop comprises the following components connected in sequence: a first fiber coupler, a phase detector, a signal amplifier, a frequency mixer, a voltage-controlled oscillator and a slave laser; wherein the frequency mixer is further connected with a local oscillator. The all-fiber laser coherent vibration measuring light path is adopted as the light path structure of the spatial sound field measuring system, can be disassembled and simply installed, and all the light paths are transmitted through optical fibers, so that the influence of ambient light can be avoided. The fiber attenuator in the local light path can adjust the attenuation coefficient in real time according to factors such as a detection distance and a detection angle, and the matching efficiency of the local light and the signal light is greatly improved.

This invention discloses a method and apparatus for a synchronously switching multi-input demodulation comparator. The method includes: setting a preset charge amount on a pair of output nodes according to a sampling clock to initialize the pair of output nodes; receiving a set of carrier modulation symbols of carrier modulation codewords, the set of carrier modulation symbols being received as multiple line signals on a multi-line bus; applying each line signal to a corresponding transistor in a set of transistors, the set of transistors being connected to the pair of output nodes and the multi-line bus according to a sub-channel vector of multiple mutually orthogonal sub-channel vectors; generating a demodulated signal with a frequency related to the set of carrier modulation symbols; generating demodulated sub-channel data output as a differential voltage on the pair of output nodes, wherein the differential voltage is generated based on a differential current formed by a linear combination of multiple line signals, and the differential current is generated in response to controlling the conductivity of the set of transistors according to the demodulated signal during the integration period of the sampling clock.

Provided in an embodiment of the present invention are a modulation signal generation method and device, a storage medium, an electronic device and a computer program product, the method comprising: according to a frequency domain resource occupied by a user, determining a value of a first subcarrier for bearing various preamble symbols of an initial modulation signal to be generated, determining a first index of a first effective subcarrier of the first subcarrier; generating a second index of a second subcarrier for bearing a signal field symbol of an initial modulation signal to be generated and data according to a predetermined interleaving mode and a dual carrier modulation (DCM) rule; selecting various symbols and data of a to-be-generated initial modulation signal according to a predetermined selection receiving mode, and correspondingly bearing the various symbols and data of the to-be-generated initial modulation signal on the first effective subcarrier and the second effective subcarrier based on the first index and the second index to obtain the initial modulation signal; and sequentially performing frequency domain processing and time domain processing on the initial modulation signal to obtain a target modulation signal.

The invention discloses a loss optimization control method suitable for a high-power motor driving system of an MMC and a CCV, and the method comprises the steps: obtaining a sub-module IGBT gate pole switching signal in a low-frequency mode through low-frequency carrier modulation according to a modulation wave of an MMC bridge arm, and obtaining a sub-module IGBT gate pole switching signal in a high-frequency mode through high-frequency carrier modulation; judging whether a bridge arm modulation wave has high-frequency abrupt change or not according to the phase change condition of the thyristor, and when the high-frequency abrupt change occurs, switching the phase bridge arm from a low-frequency mode to a high-frequency mode by a sub-module IGBT gate pole switching signal in a high-frequency mode; and calculating the commutation time of the thyristor, and when the commutation is finished, switching the phase bridge arm from the high-frequency mode to the low-frequency mode by a sub-module IGBT gate pole switching signal in the low-frequency mode. According to the invention, the switching loss of the MMC can be effectively reduced under the condition that the quality of output electric energy is not influenced, so that the operation efficiency of the driving system is improved.

An in-vehicle communication system and a vehicle. The in-vehicle communication system comprises a first optical device, N second optical devices and an optical distribution network. The first optical device is used for sending a first optical signal to a second optical device i among the N second optical devices by means of the optical distribution network. The second optical device i is used for performing optical carrier recovery on a first optical signal i to obtain a first optical carrier i, performing modulation on the basis of the first optical carrier i to obtain a second optical signal i, and sending the second optical signal i to the first optical device by means of the optical distribution network.

The invention discloses an asymmetric laser interferometer type long-distance detection demodulation system and a disturbance positioning method, the system comprises two lasers, a Mach-Zehnder fiber interferometer, a data acquisition card and an industrial personal computer, and the two lasers provide narrow linewidth light sources with unequal central wavelengths; the two paths of light sources enter the Mach-Zehnder optical fiber interferometer clockwise and anticlockwise respectively, and the two paths of signal light share the same sensing optical fiber link during detection; a phase modulator introduces a high-frequency carrier signal on one path of sensing optical fiber, and performs high-frequency carrier modulation on a corresponding sensing optical signal; then the two paths of sensing interference optical signals enter an industrial personal computer after respectively passing through an erbium-doped optical fiber amplifier, a dense wavelength division multiplexer, a photoelectric detector and a data acquisition card, and phase information introduced by a disturbance event is demodulated by the two paths of interference sensing optical signals respectively through respective corresponding improved phase generation carrier algorithms; and specific position information of the disturbance event acting on the optical fiber link is analyzed through a cross-correlation time delay estimation theory.