2926 results about "Phase modulation" patented technology

To provide a modulation / demodulation method that can avoid overshoot that occurs during a signal point transition process on a constellation even when the Y-00 encryption communication method is applied to a modulation method used in wireless communication, and a wireless communication device using the method.SOLUTION: A modulation method using the Y-00 encryption communication method by phase modulation of information for wireless communication, includes determining a reference position in a constellation of a previous signal point indicating previously transmitted data, making a certain range determined by the reference position a prohibited area so that a transition path of the signal point avoids passing near the origin on the constellation, determining a relative position of the current signal point from the reference position based on a current running key and currently transmitted data within a range excluding the prohibited area, determining I / Q coordinates on the constellation from the current signal point to generate modulated data, and performing multi-value phase modulation.SELECTED DRAWING: Figure 11

The invention discloses an interference suppression method for a random phase modulation electromagnetic metasurface. The interference suppression method comprises the following steps: constructing a mathematical model for a modulated radar echo signal; wherein a random phase modulation electromagnetic metasurface is installed on the surface of a target, a radar transmitting signal enters the random phase modulation electromagnetic metasurface, and after random time domain phase modulation, a radar echo signal is generated; discrete sampling processing is carried out after digital down-conversion and dechirping are carried out on radar echo signals, and then additional phase information is estimated after self-mixing processing is carried out. Phase compensation is carried out on the radar echo signal after discrete sampling processing under the condition that noise is considered, and then time domain differential transformation and discrete Fourier transformation are carried out; estimating a phase mutation moment by using a subspace algorithm, and reconstructing an interference modulation sequence based on an estimation result; and demodulating random phase interference by using the reconstructed interference modulation sequence, and performing matched filtering processing to obtain an output signal.

A quantum key delivery system in which a first transmission device phase modulates a first polarization component of two orthogonal polarization components in transmitted light and modulates a second polarization component, which is the other polarization component, into a signal indicating the second random number sequence, based on a first random number sequence indicating the bit sequence to be transmitted and the second random number sequence indicating the base in the phase modulation of the bit sequence to be transmitted; and a second transmission device separates orthogonal polarization modes in the received light and extracts a clock timing from the signal indicating the second random number sequence.

The invention discloses a target positioning method and system based on a single reference station, and relates to the field of wireless positioning, and the method comprises the steps: generating vortex electromagnetic waves carrying orbital angular momentum based on a transmitting end of a reference station, and generating a time-varying phase modulation transmitting signal and a metasurface time-varying coding sequence through a programmable metasurface; a time-varying phase modulation emission signal forms a multipath superposition effect in a propagation environment, a receiving end obtains a mixed signal of a direct wave and a reflected wave, and the receiving end carries out OAM mode separation on the mixed signal of the direct wave and the reflected wave through a spiral phase plate and an annular array to obtain signal components in different modes; and based on the signal component and the metasurface time-varying coding sequence, reconstructing an equivalent virtual array response by adopting a compressed sensing algorithm. According to the invention, the orbital angular momentum modal separation technology and the metasurface dynamic coding technology are creatively fused, and high-precision real-time direction finding in a complex multi-path environment is realized under a single base station architecture.

The invention relates to the technical field of optical fiber communication, and discloses an optical fiber connector optical loss automatic detection method, device and equipment, and the device comprises a modulation signal dynamic adjustment module, an environment parameter adaptive calibration module and a deep learning prediction model. The modulation signal dynamic adjustment module enhances the separability of optical fiber signals through dynamic phase modulation, and the detection precision is improved; the environmental parameter self-adaptive calibration module compensates the influence of temperature, humidity and vibration on optical signals in real time, and the stability of the system is improved; the deep learning prediction model is based on multi-dimensional data fusion and weight dynamic optimization, high-precision prediction of the performance degradation trend of the optical fiber connector is achieved, closed-loop logic from data collection to real-time prediction is formed, experiments show that the detection precision of the method can reach 99.2%, the prediction accuracy is improved to 93% or above, the optical loss calculation error is reduced to 1%, and the method can be widely applied to the field of optical fiber connectors. And meanwhile, the response speed is increased to millisecond level. The method is suitable for monitoring and predicting the optical fiber performance in a complex environment, and the precision and the real-time processing capability are remarkably improved.

The invention discloses an electromagnetic interference suppression method based on time-domain periodic phase modulation. The electromagnetic interference suppression method comprises the following steps: constructing a mathematical model of a radar echo signal which is modulated by a phase modulation surface of a target, namely is interfered; constructing a reference signal, and performing dechirp processing on the interfered radar echo signal by using the reference signal; performing frequency and duty ratio estimation on a frequency spectrum of a modulation signal, namely an interference signal, through a signal obtained after dechirping processing, and reconstructing the modulation signal at a receiving end according to an estimation result; carrying out time delay on the reconstructed modulation signal, and multiplying the reconstructed modulation signal with an interfered ground radar echo signal to obtain a demodulated signal; carrying out carrier removal processing on the demodulated signal, and then carrying out pulse pressure processing through a matched filter; and changing the time delay value of the reconstructed modulation signal, namely carrying out sliding window operation on the reconstructed modulation signal in the time domain, and determining the modulation starting time by utilizing the relationship between the maximum value of pulse pressure processing and the time delay, thereby recovering a real radar echo signal.

The invention discloses a machine vision-based intelligent detection method for steel galvanized surface defects, which comprises the following steps: S1, acquiring and preprocessing a steel galvanized surface image to obtain a standardized image; s2, constructing a specular reflection probability graph according to the brightness distribution and the gradient magnitude, and calculating a reflection intensity value; s3, calculating a structure tensor matrix, determining a main direction angle and an anisotropic consistency coefficient, and generating a direction feature matrix; s4, establishing a multi-scale direction adaptive phase kernel function, and performing phase modulation in a frequency domain by adopting an improved phase stretching transformation algorithm; s5, inverse Fourier transform is executed, and a phase response matrix is extracted; s6, performing weighted fusion to obtain a comprehensive phase response diagram; and S7, setting a threshold value according to the noise variance and the statistical characteristics, executing binarization and morphological processing, and outputting a defect region and boundary coordinates. According to the invention, high-precision identification and boundary positioning of steel galvanized surface defects are realized.

The invention discloses a wind power grid-connected oscillation suppression method and system based on a self-adaptive damping controller, and relates to the technical field of oscillation suppression of a power system. According to the method, a self-adaptive damping controller structure is designed, and parameter setting is completed; then building a wind power grid-connected system simulation model; after voltage signals are collected, an FFT processing method is used for identifying oscillation frequency, and whether an unstable oscillation mode exists in the system or not is judged; if unstable oscillation exists, a self-adaptive damping controller is connected between the wind power plant side and the power grid side; the self-adaptive damping controller filters out signal components causing system oscillation and performs phase modulation; a signal component generated by the self-adaptive damping controller is injected into the power grid and counteracts with an original signal, and oscillation suppression is achieved. According to the self-adaptive damping controller designed by the invention, the oscillation frequency identification module and the phase shift parameter calculation module are introduced, so that measured data can be fully utilized, control link parameters are adjusted according to vibration frequency changes, and oscillation is effectively suppressed.

The invention relates to the technical field of quantum communication security, and discloses a quantum key distribution secure communication system based on a quantum mechanics principle. The system comprises a quantum state preparation unit which controls a quantum emission device to output a quantum state sequence containing a preset polarization angle and a phase modulation photon group; a quantum channel feature extraction unit captures channel environment interference parameters and constructs a photon polarization distribution matrix; a quantum communication security evaluation unit receives the matrix, and calculates a channel security coefficient threshold through a quantum bit error rate analyzer; the quantum key dynamic optimization unit generates an optimized key segmentation strategy in combination with a security coefficient threshold and a historical key negotiation record; the quantum key rotation control unit switches quantum state modulation parameters according to a segmentation strategy and a time window; and the quantum node synchronization management unit monitors node clock offset and injects a calibration signal to realize key distribution time slot alignment. The system can dynamically cope with environmental interference, and improves the security and adaptability of quantum key distribution.

The embodiment of the invention discloses a midpoint potential control method based on a diode clamping type three-level grid-connected inverter and a related device. The method comprises the following steps: generating an initial three-phase modulation wave through a current loop closed-loop control method according to a collected three-phase current value and a three-phase voltage value of a power grid side of the diode-clamped three-level grid-connected inverter; according to an initial modulation waveform generated by the initial three-phase modulation wave, a three-phase current value and an acquired voltage value of a voltage dividing capacitor at the direct current side of the diode clamping type three-level grid-connected inverter, calculating a zero-sequence component required by neutral-point potential balance; superposing a zero-sequence component required by neutral-point potential balance with the initial modulation waveform to obtain a final modulation wave; and generating a driving signal matched with each phase of bridge arm in the diode clamping type three-level grid-connected inverter according to the final modulation wave. By adopting the invention, the neutral-point voltage can be balanced, the distortion of the output waveform at the alternating current side is reduced, the voltage stress of the device is reduced, and the service life of the power device is prolonged.

The invention provides a low-resolution scene deception jamming method for three-channel SAR-GMTI, and belongs to the technical field of radar countermeasure and artificial intelligence. The method comprises the following steps: constructing a deception scene template by utilizing an actually measured data imaging result; obtaining a low-resolution deception scene template through low-resolution processing; obtaining an interference amplitude gain parameter through a construction function and an optimization method; and carrying out amplitude modulation, phase modulation and time delay modulation on the intercepted radar signals in combination with the interference parameters, and then forwarding the signals, so as to generate a vivid false moving target detection result for radar detection. The objective of the invention is to generate a vivid false moving target by reducing the number of scattering points contained in a template and keeping a high correlation technique. Compared with an existing deception method, the method has the advantages that the generated signal is matched with the target signal in parameter, the number of scattering points contained in the false motion deception template is reduced, the calculation complexity can be greatly reduced, and a high-fidelity false motion target with an edge contour is generated.

The invention provides an OTFS radar communication integrated signal processing method and system based on time-frequency-space domain joint optimization. According to the method, pilot symbol positions and densities are configured in an OTFS time-frequency grid according to channel time-varying characteristics and bandwidths, and a Doppler index range is set to optimize channel information acquisition; deploying a controllable reflecting surface, constructing a phase modulation matrix based on a target position and communication channel parameters, dynamically adjusting a phase gradient direction, and separating energy of a target echo and a communication signal; within a set Doppler index range, calculating frequency offset estimation, correcting a time domain sampling point of a received signal, and generating a phase correction vector; and positioning a spatial aliasing main interference area, and inhibiting symbol interference and spatial aliasing caused by a high-speed target through frequency domain beam forming weighting and phase rotation compensation in combination with a phase correction vector and a sub-Doppler parameter in the area. According to the invention, time-frequency-space domain cooperative efficient processing of OTFS radar communication integrated signals is realized.

The invention relates to the technical field of detection, in particular to a complex shell detection method and system based on structured light scanning. The method comprises the following steps: calculating a wrapped phase value and a phase modulation amplitude of each pixel point under each frequency, calculating discrete probability distribution containing candidate stripe series and a corresponding probability for each pixel point based on a multi-frequency wrapped phase difference, generating an initial pixel confidence map, and constructing an energy function; the penalty weight of the smooth item is determined according to the phase modulation amplitude and the wrapped phase gradient local variance, obtaining an initial fringe order distribution diagram, updating discrete probability distribution by using an initial pixel confidence map, re-minimizing an energy function to obtain a corrected fringe order distribution diagram, and reconstructing a final three-dimensional shape. And iteratively optimizing a projector principal point and a radial distortion coefficient in system calibration parameters. According to the scheme, the geometric details of the surface can be reserved, and the processing effect and the measurement precision of the complex curved surface and the high-curvature area are improved.

The invention discloses an overhead line system cable state real-time monitoring method and sensing system based on distributed optical fiber sensing. The Mach-Zehnder interference and phi-OTDR fusion type distributed optical fiber sensing system comprises a first light source, a second light source, a Mach-Zehnder interferometer, a phi-OTDR and a data acquisition and processing module. Raman amplifiers are arranged at the two ends of the Mach-Zehnder interferometer, so that the sensing distance is prolonged; the optical fiber sensing system extracts an interference optical signal and a backward Rayleigh scattering optical signal corresponding to a fault event after phase modulation when the fault event occurs; then processing the extracted backward Rayleigh scattering light signal to obtain intensity change information of a fault event, and demodulating the position of the fault event; and sending the two-dimensional optical signal into a pre-trained Swin Transform network model to extract a time domain feature, a frequency domain feature and a spatial domain feature, and identifying the type of a fault event through a classifier.

The invention discloses a multi-sideband chirp modulation DAS system and a working method thereof, and relates to the technical field of distributed sound wave sensing. The DAS system comprises a narrow linewidth laser, an optical fiber coupler, a phase modulator, an electro-optical modulator, an erbium-doped optical fiber amplifier, an optical fiber circulator, a dense wavelength division multiplexer, a photoelectric balance detector, a data acquisition card, an arbitrary waveform generator, a direct current source and the like. The phase modulator is used for modulating constant-amplitude multi-frequency continuous light, the frequency number of light waves is related to the harmonic number of a microwave modulation signal, the frequency interval is determined by the fundamental frequency of the microwave modulation signal, the continuous light frequency can be flexibly modulated by adjusting the microwave modulation signal, and the modulation bandwidth is large; detected beat frequency signals are compressed into single-frequency signals through pulses, phase information of the single-frequency signals is demodulated, vibration signals along the sensing optical fiber can be detected, the spatial resolution of the system depends on the chirp frequency sweeping range, and the spatial resolution is high.

The embodiment of the invention provides a metasurface phase shift module, an antenna array and an electromagnetic wave phase modulation method, the metasurface phase shift module comprises a transmission metasurface and a bias unit, and the transmission metasurface is provided with an adjustable electronic component; the bias unit is connected with the adjustable electronic element and inputs bias voltage to the adjustable electronic element; wherein the transmission metasurface performs phase regulation and control on the received electromagnetic wave through the adjustable electronic element and the bias voltage. According to the invention, the problems of low precision, low flexibility, slow response and the like of a base station electrically-tunable antenna scheme caused by adjusting the phase of the electromagnetic wave through the physical movement of a mechanical structure in the related technology are solved.

The invention discloses an intelligent optimization driving electromagnetic information metasurface multi-dimensional dynamic regulation and control system, solves the problem that the function solidification of an existing metasurface is difficult to dynamically adjust, and belongs to the crossing field of electromagnetic metamaterials and intelligent control technologies. The method comprises the steps that a sensor network collects environment multi-dimensional information of a programmable metasurface unit in real time; the controller processes the environment multi-dimensional information to obtain a multi-dimensional sensing result; the multi-dimensional interaction layer inputs design parameters, the intelligent decision-making layer combines the design parameters and a multi-dimensional perception result to construct a target joint optimization model, reverse design is carried out on the super-surface array coding sequence, and a display array coding pattern and a three-dimensional radiation pattern / two-dimensional radiation pattern are obtained according to the designed super-surface array coding sequence; displaying on the multi-dimensional interaction layer; and the controller performs real-time electromagnetic response reconstruction and 1-bit or 2-bit phase modulation on the programmable metasurface unit through the field programmable gate array according to the designed metasurface array coding sequence.

In some aspects of the disclosure, an apparatus for wireless communication by a user equipment (UE) includes a primary receive (PRx) path associated with a first antenna and configured to receive a wireless signal. The apparatus further includes a diversity receive (DRx) path associated with a second antenna antenna. The apparatus further includes a phase shifter configured to phase-modify an interference signal from the second antenna based at least in part on a physical distance between the first antenna and the second antenna and further based on an angle of arrival (AoA) associated with the interference signal. The apparatus further includes a circuit configured to generate a received signal based on the wireless signal and the phase-modified interference signal.

The embodiment of the invention relates to a multi-energy complementary coordinated control system and method based on multi-element energy storage, electronic equipment and a storage medium. And various data support optimization decisions of multiple stations are obtained through data fusion. And a decision generation scheme is optimized, the operation state and benefit analysis are displayed, and precise regulation and control of the station are realized. And configuring a management algorithm for the model, and setting boundary conditions and objective functions. The internal coordination supplementary logic plays a role in the aspects of active power adjustment, power grid frequency fluctuation and synchronous phase modulation. Through the means, the acceptance degree of the power grid to renewable energy sources is improved, so that the multi-energy complementary system can better respond to a power grid dispatching instruction, and energy resource optimization management is realized. And meanwhile, the stability and reliability of the power grid are enhanced, the economic benefit of the system is improved, and a powerful guarantee is provided for efficient operation of the multi-energy complementary coordination control system.

The invention discloses an optical memristor, and relates to the field of photon integrated circuits and optical computing, and the optical memristor comprises a waveguide layer, a ferroelectric film layer, an electrode structure and a substrate. The ferroelectric film layer is located on the upper surface of the substrate; the waveguide layer and the electrode structure are located on the upper surface of the ferroelectric film layer; the waveguide layer is used for propagating an incident light signal and performing amplitude modulation on the incident light signal; the electrode structure is used for applying an electric field to the ferroelectric film layer; and the ferroelectric film layer is used for carrying out phase modulation on optical signals transmitted in the waveguide layer under the action of the electric field. The ferroelectric material is used as the optical switch of the optical memristor, efficient modulation of the optical phase is achieved through the non-volatility and the high electro-optical effect of the ferroelectric material, and meanwhile the optical memristor has the advantages of being low in energy consumption and rapid in response.

The invention discloses a water treatment equipment data intelligent processing method and system based on cloud control, particularly relates to the technical field of multi-stage water treatment process cooperative control, and is used for solving the problem of chained control failure caused by the fact that an existing cloud control system does not pre-judge a disturbance propagation path. The method comprises the following steps: establishing an inter-process-section hydraulic propagation correlation model which comprises a connection relation and a fluid transmission delay parameter; identifying a water inlet end water quality sudden change event type in real time; generating a time sequence path for propagating the mutation event to the downstream based on the model and the fluid flow rate; generating a dynamic response intensity factor of each process section according to the predicted time difference of arrival and fluid characteristics in the time sequence path; generating an energy attenuation factor according to the propagation distance and the pollutant type; generating a cooperative control instruction set by taking the dynamic response intensity factor as an amplitude constraint and the energy attenuation factor as a phase modulation parameter, and issuing the cooperative control instruction set to an edge end actuator; and global anti-disturbance cooperative control of a water treatment whole process chain is realized.

Example channel circuits, data storage devices, and methods for data read synchronization from phase modulated synchronization fields are described. A data synchronization detector may receive an oversampled digital read signal read from a synchronization field that uses a single written pattern to encode the start of data position, phase, and gain for the read channel. The write pattern may use a phase modulated carrier signal to encode a pseudo-random binary sequence indicating the start of data position.

The invention discloses an arbitrary digital signal synthesis method and system. The method comprises the following steps: analyzing a target parameter of a digital signal to be synthesized; generating a first multi-path baseband waveform by using a digital direct frequency synthesizer according to a modulation rate parameter in the target parameters, and reading pre-stored noise data to generate a second multi-path baseband waveform; selecting a plurality of appointed baseband waveforms, and modulating the plurality of baseband waveforms by using carrier frequency and bandwidth parameters in target parameters to obtain a plurality of instantaneous frequency curves; and integrating the multiple instantaneous frequency curves to obtain a phase stepping curve of each path, selecting a phase modulation curve according to a phase modulation type in the target parameters, and performing digital direct frequency synthesis on the phase stepping curve and the phase modulation curve of each path to generate multiple parallel digital synthesis signals. According to the invention, the synthesis process of the digital signals of different modulation types is uniformly decomposed, so that the coupling degree of the module and the complexity of the system are greatly reduced, and meanwhile, the resource consumption is reduced.

An antenna includes multiple pillbox antenna structures arranged in a circle to cover the horizon. Each pillbox antenna structures includes a reflector configured to widen the resulting beam so that neighboring pillbox antenna structures produce beams that interact to more fully cover the horizon. A feed layer may include transmit / receive modules that are configured to apply amplitude and phase modulations to input signals for each pillbox antenna structure. Amplitude and phase modulations enable constructive and destructive interference between neighboring pillbox antenna structures to enhance the resulting beam or create nulls to exclude interfering signals. Sets of pillbox antenna structures may be stacked and angularly offset to correct crossover sectors. Alternatively, or in addition, sets of pillbox antenna structures may be adapted to operate in different, distinct frequency bands.

The invention discloses a secondary modulation interference signal generation method and device, a storage medium and equipment, and belongs to the technical field of radar countermeasure. The method comprises the following steps: a jammer processes a target SAR signal to obtain a digital SAR signal and calculates a signal parameter; generating a distance-direction phase modulation signal, a distance-direction sine function modulation signal, a distance-direction frequency shift modulation signal, an azimuth-direction phase modulation signal, an azimuth-direction sine function modulation signal and an azimuth-direction frequency shift modulation signal according to the signal parameters by combining a required interference type; according to the generated signals and the digital SAR signals, range direction modulation and azimuth direction modulation are completed, and finally digital interference signals are obtained; and converting the digital interference signal into an analog interference signal and forwarding the analog interference signal to the target SAR system, and generating different types of interference effects through imaging processing. According to the invention, nine different types of two-dimensional interference effects can be flexibly generated, and the central position of the interference result can be accurately controlled.

The invention discloses a light spot shaping device based on wave plate polarization conversion and a use method, and relates to the technical field of laser processing, the device divides random polarized light into S / P light through a first polarization beam splitter (PBS), converts the S light into P light through a first 1 / 2 wave plate, modulates the S light through a conventional silicon-based liquid crystal spatial light modulator (LCoS SLM), and converts the P light into the S light through a second 1 / 2 wave plate. And the beams are combined by the second PBS. The method comprises the steps of light splitting, polarization conversion, phase modulation, beam combining, beam expanding and focusing and the like. The double 1 / 2 wave plates are combined with the conventional PBS, the laser energy utilization rate is higher than 85%, commercial SLM equipment is adapted, the machining efficiency of the shaped annular light spots is remarkably improved compared with that of Gaussian beams, the method is suitable for laser welding and metal 3D printing, and the problems of energy waste and high cost are solved.

The invention provides a PPP-B2B-based positioning time service method, system and device and a readable storage medium, and relates to the technical field of information, and the method comprises the steps: receiving a PPP-B2b message and GNSS original observation data, extracting key features from the self-matched PPP-B2b message, and carrying out the learning and matching of the key features through a support vector machine; the satellite position and the satellite clock error are calculated by using the PPP-B2b orbit and the clock error correction data, an error model containing an error term is constructed, and the error model is optimized by using a nonlinear least square method; establishing a dual-frequency ionosphere-free combination model by using the calculated satellite position and satellite clock difference; and performing parameter estimation by adopting Kalman filtering to complete real-time positioning time service. Under the non-networking condition, single-station real-time high-precision positioning is achieved, and meanwhile synchronization of a local clock and a satellite system clock is achieved in a phase modulation mode.

The invention discloses a multi-source data-based selling point generation method for AI intelligent marketing, and relates to the technical field of big data analysis and application, and the method comprises the following steps: obtaining a unified time scale matrix in a multi-source data access stage, building an extreme value inhibition prior based on the unified time scale matrix, and building an acquisition synchronization baseline; full-link time alignment is realized by collecting a synchronous base line; and acquiring an extreme value diagnosis fingerprint under the constraint of full-link time alignment, generating a threshold track based on a quantile residual spectrum and kurtosis skewness, and capturing and calibrating a burst extreme value by taking the threshold track as a dynamic reference. According to the method, a time sequence consistency basis is constructed, a data extreme value is accurately identified and corrected, the content is ensured to be true and credible in combination with causal correction and semantic screening, dynamic closed-loop optimization of content generation and delivery is realized through closed-loop feedback and phase regulation and control, and the authenticity, stability and compliance of AI marketing content are effectively improved.

The invention belongs to the technical field of photoelectronics, and particularly relates to a wide-spectrum narrow-linewidth semiconductor mode-locked laser, and the collaboration of a saturable absorption region SA and a resonator is reflected in time domain-frequency domain dual optimization. And the resonator optimizes the frequency domain characteristics through nonlinear broadening, phase synchronization and mode purification. The SA adjusts a mode locking threshold value in real time through dynamic bias voltage, the pulse energy stability is ensured, dispersion management of the resonator balances the SPM and group velocity dispersion, spectrum splitting is avoided, and the dissipative soliton form is maintained. Besides, due to heterogeneous integration of the InP-based SA and the SiN-based resonator, wafer bonding of the InP-based SA and the SiN-based resonator is realized, high-efficiency energy transfer is realized through the low-loss conical waveguide, a high-performance frequency comb with a wide spectrum and a narrow pulse width is output, and the high-performance frequency comb can be widely applied to the fields of ultrafast optics, coherent light communication and precision spectroscopy.

The invention relates to an optical acoustic sensor, in particular to a high-sensitivity acoustic sensor based on Fano resonance and a measuring method. The problem that an existing optical acoustic sensor is low in sensitivity is solved. A high-sensitivity acoustic sensor based on Fano resonance comprises a 1550nm laser, a phase modulator, a first polarization controller, a conical optical fiber, a CaF2 crystal resonant cavity, a second polarization controller, a photoelectric detector, an oscilloscope and a computer. The emergent end of the 1550nm laser is connected with the head end of the conical optical fiber through the phase modulator and the first polarization controller in sequence; the conical optical fiber is coupled with the CaF2 crystal resonant cavity; the tail end of the conical optical fiber is connected with the incident end of the photoelectric detector through the second polarization controller; the signal output end of the photoelectric detector is connected with the signal input end of the oscilloscope; the signal output end of the oscilloscope is connected with the signal input end of the computer. The method is suitable for acoustic signal measurement in the fields of industry, traffic, environmental protection, medical treatment and the like.