30 results about "Digital demodulation" patented technology

The invention relates to the technical field of digital demodulation, in particular to a digital demodulation method suitable for deep ultraviolet light communication, which comprises the following steps of: adopting multiple delay processing with half code element width, and respectively carrying out double extraction processing on a discrete sampling signal which is not subjected to delay processing and a plurality of delay sampling signals to obtain a plurality of delay extraction signals; in this way, the key sampling time in the coverage code element period can be ensured, and a basis is provided for subsequent accurate synchronization; a plurality of delay extraction signals are respectively input into corresponding equalization processing units, a preset local training sequence is loaded to each equalization processing unit to obtain a plurality of equalization filtering signals, and the plurality of equalization filtering signals and the preset local training sequence are respectively subjected to related judgment processing, so that the inter-symbol interference is inhibited, and meanwhile, the equalization processing efficiency is improved. The synchronization signal can be quickly screened out, so that the problem that inter-symbol interference and synchronization are difficult to consider in a traditional demodulation method is solved, and the demodulation efficiency and reliability are remarkably improved.

The invention discloses an active pen and touch screen interaction system resistant to common-mode interference and a signal demodulation method. The system comprises a signal receiving terminal and a signal transmitting terminal. The signal transmitting terminal modulates data to be transmitted by adopting a differential binary phase shift keying modulation method, and transmits a generated modulation signal to the signal receiving terminal; the analog front-end receiving module is coupled with the signal transmitting terminal, receives the modulation signal and outputs a digital square wave signal after fidelity extraction processing; and the digital demodulation processing module performs differential coherent digital demodulation on the digital square wave signal based on the prior characteristics of the modulation signal, inhibits residual noise and recovers data to be sent. The analog front end focuses strong common-mode noise suppression and analog filtering, the digital demodulation algorithm performs secondary digital purification by using signal time sequence characteristics, and the two constructs an efficient anti-interference pipeline. Meanwhile, the regular square wave signals can be directly processed through differential coherent demodulation, and the requirements for performance and power consumption of a rear-end processor are lowered.

The application discloses a kind of based on bimodal resonance's photoacoustic-scattering aerosol dual-wavelength synchronous detection system and method, belong to photoelectric detection technical field, in the system, dual-wavelength light source modulation module generates two different frequency modulated laser, respectively from two ends into double-difference bulb pipe coupling photoacoustic-scattering combined gas cell;The gas cell includes the two ends of two acoustical tubes arranged in parallel and each is connected with an integrating sphere, form H type coupling structure;Scattering signal collection module, photoacoustic signal acquisition and processing module respectively acquire two-channel scattering photon counting data in two integrating spheres, sound wave signal in two acoustical tubes and two integrating spheres;Digital lock-in signal processing module based on FPGA outputs modulation signal to light source, and receives sound wave signal in two acoustical tubes and two integrating spheres to carry out full-digital demodulation and processing.The application effectively solves the problem of time-space asynchronization and sampling cumulative error caused by time-sharing multiplexing or multiple machine parallel connection.

The application discloses a laser phase noise measurement method based on delay self-heterodyne and digital demodulation, and relates to the technical field of laser measurement, and comprises the following contents: after being adjusted by a variable optical attenuator, to-be-measured laser is divided into a frequency shift arm and a delay arm, the frequency shift arm is frequency-shifted by an acousto-optic modulator, the delay arm is delayed by a delay optical fiber, and original electric beat frequency signals are obtained by a balanced photoelectric detector after the two arms are coupled; homologous and synchronous quadrature demodulation is carried out on the original electric beat frequency signals, envelope credibility judgment and abnormal sample repair are combined, and a continuous differential phase sequence is obtained; actual optical time delay is determined according to the beat frequency spectrum characteristics and the continuous differential phase sequence, and a differential phase power spectral density is formed; then, transmission relationship conversion is carried out according to the actual optical time delay, bounded spectrum compensation is implemented on a zero point neighborhood and a low credibility frequency point, and an intrinsic phase noise power spectral density is obtained. The application can improve the stability, continuity and result credibility of phase noise measurement under the condition of short delay.

The application discloses a pulse high-voltage divider calibration device and method, wherein the device comprises a pulse high-voltage source, a high-voltage voltage dividing network, a high-voltage multi-node acquisition module, a high-voltage optical fiber transmission module, a high-voltage signal demodulation module, a multi-channel acquisition module and a calibration controller. The high-voltage voltage dividing network is composed of RC parallel circuits in series and is used for dividing high-voltage signals. The high-voltage multi-node acquisition module is used for measuring pulse voltage signals after voltage division. The high-voltage optical fiber transmission module comprises a fiber transmitter and a high-voltage weather-resistant single-mode optical fiber and is used for transmitting pulse voltage signals in the form of optical signals. The high-voltage signal demodulation module comprises a fiber receiver and a digital demodulator and is used for receiving and demodulating optical signals. The multi-channel acquisition module comprises a synchronous clock source, an acquisition unit and a cache unit and is used for acquiring and storing pulse voltage signals. The calibration controller is used for calculating pulse voltage signals. The application solves the problems of a complex calibration system, weak anti-electromagnetic interference and a complicated calibration process.

The invention provides a digital demodulation type quartz MEMS tuning fork trimming device, and belongs to the field of MEMS tuning fork trimming. The device comprises an upper computer and a quartz MEMS tuning fork which are respectively connected with a first controller and a second controller. The upper computer is used for sending a first driving command to the first controller and sending a second driving command and a third driving command to the second controller; the second controller is used for controlling the quartz MEMS tuning fork to work in a gyro function mode according to the second driving command and the first parameter when a driving end mass block of the quartz MEMS tuning fork is roughly repaired; and the fine trimming module is used for performing linear frequency sweeping on the quartz MEMS tuning fork according to the third driving command during fine trimming to obtain a target mechanical orthogonal item, and determining that fine trimming of the driving end mass block is completed when the target mechanical orthogonal item reaches the standard. The trimming efficiency and precision can be considered through double-stage trimming and automatic control, and meanwhile the trimming cost is reduced.

The present invention provides a receiving device and a receiving method that can obtain an appropriate RSSI value corresponding to the signal quality of the actual received signal received by the antenna. [Solution] The receiving device and receiving method include an RSSI detection unit 13 in the receiving high-frequency unit 10 that detects a detected RSSI value from the input received signal, a signal quality level calculation unit 23 in the receiving control unit 20 that calculates the signal quality level from the received signal digitally demodulated by the digital demodulation unit 21, a virtual RSSI conversion unit 24 that converts it into a virtual RSSI value corresponding to the signal quality of the actual received signal received by the antenna, and an RSSI output display unit 25 that displays the virtual RSSI value and the detected RSSI value.

The invention relates to a PID parameter adaptive adjustment method and system, electronic equipment and a readable medium, and the method comprises the steps: outputting an analog voltage signal corresponding to an expected gradient waveform to a gradient amplifier through a gradient output module, so as to form an actual current corresponding to the analog voltage signal through the gradient amplifier; a voltage feedback signal which is output by the gradient amplifier and corresponds to the actual current is transmitted to the spectrometer radio frequency module; performing amplitude modulation and frequency mixing on the voltage feedback signal through a spectrometer radio frequency module to obtain a frequency mixing signal; digital sampling and digital demodulation are carried out on the frequency mixing signal through an optical fiber box, and an actually measured gradient waveform is obtained; and calculating a time domain error between the expected gradient waveform and the actually measured gradient waveform, and under the condition that the time domain error is greater than a target error, adaptively adjusting the PID parameter according to the error type of the actually measured gradient waveform until the time domain error is less than the target error. The problem that the PID parameters of the gradient amplifier are difficult to adaptively calibrate accurately is solved.

This invention discloses a low-power analog front-end circuit and control method for animal tags. The circuit includes: a radio frequency (RF) unit, a power management unit, and an antenna. The power management unit includes a rectifier and a low-power power management circuit. The rectifier is connected to the antenna. The low-power power management circuit supplies power to the RF unit and digital circuits. The RF unit includes a load modulation and limiting circuit, a demodulation circuit, and a clock generation circuit. The demodulation circuit receives the demodulated envelope signal sent by the rectifier and outputs digital demodulated data to the digital circuits. The clock generation circuit extracts a clock signal from the antenna signal generated by the antenna and outputs the clock signal to the digital circuits. The load modulation and limiting circuit receives the limiting reference voltage sent by the rectifier and the uplink data output by the digital circuits. In this embodiment, an animal identification tag adapted for wireless communication achieves a balance between low power consumption and small area while ensuring communication reliability.

This invention provides a coherent acquisition platform with a full-dimensional mismatch self-correction time-interleaved ADC system, belonging to the field of mismatch self-correction technology. The architecture includes an analog front-end conditioning module, a time-interleaved ADC sampling array, a clock synchronization distribution module, a full-dimensional mismatch self-correction module, and a high-speed data transmission module. The ADC sampling array employs an interleaved structure with multiple main channels and multiple sub-ADCs per channel, achieving ultra-high-speed synchronous acquisition of multiple coherent signals. The full-dimensional mismatch self-correction module pioneers a dual-mode detection mechanism of "calibration sequence injection + blind estimation," which can detect and correct four types of mismatches—gain, delay, bias, and bandwidth—between sub-ADCs in real time, balancing initial calibration accuracy with dynamic environmental adaptability. This invention has advantages such as high sampling rate, good synchronization, excellent mismatch suppression effect, and strong signal integrity, and can be directly used in coherent acquisition equipment with speeds of 100G and above, providing high-quality signals for subsequent digital demodulation.

This invention relates to the field of digital signal communication technology and discloses a DBPSK digital demodulation method based on the principle of baseband signal envelope phase tracking, comprising the following steps: S1: capturing the DBPSK modulated signal; S2: performing digital down-conversion processing on the DBPSK modulated signal to obtain the I-channel baseband signal envelope and the Q-channel baseband signal envelope; S3: comparing the amplitudes of the I-channel and Q-channel baseband signal envelopes and selecting the baseband signal envelope with the larger amplitude as the demodulation basis; S4: based on the correlation between the demodulation basis and the original information symbols, outputting a binary symbol sequence that maintains a fixed correspondence with the original information symbols. This invention can perform digital demodulation and obtain a binary symbol sequence after capturing a valid DBPSK modulated signal, can adapt to most Doppler frequency shift ranges in engineering applications, occupies and consumes few resources, and has good portability.

To provide a method for digital demodulation of all even harmonics of a magnetic modulator based on full phase analysis.SOLUTION: According to the digital demodulation method for all even-order harmonics of a magnetic modulator based on full-phase analysis, when the magnetic modulator is calibrated, standard voltage time sequence data output by the magnetic modulator when a direct current calibration current of a set value flows through the magnetic modulator is obtained, an output voltage sequence of full-phase Fourier analysis is established and pre-processed according to the standard voltage time sequence data, and the pre-processed output voltage sequence of full-phase Fourier analysis is comprehensively analyzed to obtain standard even-order harmonic signals and current conversion coefficients of each order. The present invention uses the full-phase Fourier analysis technology to perform comprehensive pre-processing and comprehensive analysis on the output voltage signal of the air modulator, which greatly reduces the problems of spectrum leakage and phase disturbance, so that the data sampled at different time points are fully utilized, and the signal processing is more accurate.SELECTED DRAWING: Figure 1

Embodiments of the invention relate to a single pin impedance measurement system and phase offset compensation for a single pin impedance measurement system. An impedance measurement system comprising: a signal generator comprising a memory and arranged to generate a digital test signal and at least one digital demodulation signal based on the memory, where the digital test signal has a first frequency and the at least one digital demodulation signal has a first frequency; a single pin for providing an analog test signal based on the digital test signal to a device under test (DUT) and measuring an analog input signal in response to providing the analog test signal to the DUT; and a demodulator configured to obtain a first filtered digital signal based on the input signal to generate at least one digital demodulated signal indicative of the impedance; and at least one digital demodulation signal.

Light emitted by an erbium light source assembly is split through a 30 / 70 single-mode optical fiber beam splitter, 30% of the light enters an X-axis optical path, 70% of the light enters a first 50 / 50 single-mode optical fiber beam splitter, and 35% of the light enters a Y-axis optical path and a Z-axis optical path respectively; the light entering the light path of each axis is split by the second 50 / 50 beam splitter and then enters the Y waveguide, the Y waveguide performs polarization processing on the light and then divides the light into two beams, the two beams of light return to the Y waveguide to generate interference after passing through the optical fiber ring, and an interference light signal enters the photoelectric detector through the second 50 / 50 beam splitter and enters the photoelectric detector through the second 50 / 50 beam splitter. The photoelectric detector converts the interference light signal into an electric signal and sends the electric signal to the gyroscope digital circuit; the gyroscope digital circuit is used for carrying out signal conditioning, AD sampling and digital demodulation on the electric signals output by the photoelectric detector; and the light source driving and signal integrated processing circuit is used for converting the output of the three-axis fiber-optic gyroscope circuit into three-axis angular velocity information and respectively carrying out temperature compensation on the three-axis angular velocity information.

An impedance measurement system is provided. [Solution] The impedance measurement system includes a signal generator with memory. The signal generator is configured to generate a digital test signal and at least one digital demodulated signal based on the memory. The digital test signal has a first frequency, and at least one digital demodulated signal has a first frequency. The impedance measurement system also includes a single pin. The single pin is configured to supply an analog test signal based on the digital test signal to the device under test (DUT) and to measure an analog input signal in response to supplying the analog test signal to the DUT. The impedance measurement system also includes a demodulator. The demodulator is configured to acquire a first filtered digital signal and at least one digital demodulated signal based on the input signal and generate at least one demodulated digital signal indicating impedance.

The invention belongs to the technical field of wireless communication, and relates to a digital demodulation method based on a GAMP algorithm. For a scene that the number of radio frequency links of a base station is less than that of users, the digital demodulation method comprises the following steps: the base station receives superposed signals input by multiple users; estimating a user input signal to obtain an initial solution of optimal estimation; determining a prior distribution of the user input signal; calculating conditional posteriori distribution of the user input signal and the noise-free user input signal modulated by the analog matrix, wherein the conditional posteriori distribution comprises expectation and variance; and obtaining a column of estimation results and corresponding variances based on a GAMP algorithm, wherein the estimation results are modulation data. The analog matrix adopted by the digital demodulation method demodulates the multi-user modulation signals under the condition that the number of radio frequency links of a base station is smaller than the number of users, and the modulation information of the multiple users is recovered by using fewer observation signals, namely, the users with the number larger than that of the radio frequency links can be served by using a limited number of radio frequency links.

An impedance measurement system including: a signal generator including a memory and arranged to generate a digital test signal and at least one digital demodulation signal based on the memory, wherein the digital test signal has a first frequency and the at least one digital demodulation signal has the first frequency; a single pin for providing to a Device Under Test (DUT), an analogue test signal based on the digital test signal and measuring, in response to providing the analogue test signal to the DUT, an analogue input signal; and a demodulator configured to obtain: a first filtered digital signal based on the input signal; and the at least one digital demodulation signal to produce at least one digital demodulated signal indicative of the impedance.

The invention belongs to the technical field of electrical measurement, and particularly discloses a frequency hopping excitation-digital demodulation weak current measurement system and method.The frequency hopping square wave excitation device is used for introducing frequency hopping variable square wave voltage signals to an excitation winding by setting a frequency hopping matrix; and the digital demodulation device is used for penetrating a current signal to be measured into the center of the magnetization current induction device, acquiring voltages at two ends of the detection winding, demodulating a second harmonic amplitude by combining a square wave voltage signal, performing Fourier transform on a second harmonic amplitude matrix, and obtaining a current measurement value by combining the overall sensitivity. The interference of scattered frequency band signals on high-accuracy measurement is avoided to a great extent, and the sensitivity and accuracy of a weak current measurement system are improved.

The present invention provides a broadcast receiver and a broadcast reception method that make it possible to reduce a sense of incongruity felt by a viewer when switching between an analog broadcast wave and a digital broadcast wave. This broadcast receiver comprises: a digital demodulation unit that receives a first clock signal from a first clock source and outputs a digital audio signal obtained by demodulating a digital broadcast; an analog demodulation unit that receives a second clock signal from a second clock source and outputs an analog audio signal obtained by demodulating an analog broadcast; a calculation unit that calculates a correlation value indicating a correlation between the digital audio signal and the analog audio signal, and calculates a time difference between the digital audio signal and the analog audio signal on the basis of the correlation value; and a synchronization unit that synchronizes the digital audio signal and the analog audio signal on the basis of the time difference. The calculation unit evaluates either the digital broadcast and the analog broadcast or the digital audio signal and the analog audio signal, and changes at least one of the process of calculating the correlation value and the process of calculating the time difference according to the result of the evaluation.

Radar sensor with a transmitter (10) comprising a digital modulation stage (16, 18) for generating a transmit signal (c) by digital modulation of a base signal (a), and with a receiver (12) comprising a digital demodulation stage (24) and a mixer (20) which mixes the received signal with the base signal and supplies the mixing result to the digital demodulation stage (24), characterized in that the transmitter (10) comprises a base signal generator (14) for generating a frequency-modulated signal as the base signal (a).

This application discloses a digital demodulation method, apparatus, device, and storage medium, relating to the field of digital communication. The method includes: acquiring a filtered signal of a transmitted signal after passing through a filter, and performing phase differential on the filtered signal; extracting the obtained differential phase and determining the signal to be demodulated based on the differential phase; determining the target differential phase of the filtered signal according to the current communication environment, and constructing a composite grid based on the target differential phase; determining sub-grids based on the composite grid, and determining the branch path metric and total path metric of the signal to be demodulated based on the sub-grids; performing Viterbi demodulation based on the total path metric, and obtaining the demodulation result by backtracking the Viterbi demodulation based on the total path metric. This application constructs a composite grid phase compensation model for GMSK and proposes a composite Viterbi demodulation algorithm for GMSK signals based on differential phase, which can overcome the influence of Doppler frequency offset on demodulation performance and maintain excellent performance even with large frequency offsets.

The invention relates to a radar sensor having a transmitting part (10) comprising a digital modulation stage (16, 18) for generating a transmission signal (c) by digitally modulating a base signal (a), and having a receiving part (12) comprising a digital demodulation stage (24) and a mixer (20) which mixes the received signal with the base signal and feeds the mixing result to the digital demodulation stage (24), characterized in that the transmitting part (10) has a base signal generator (14) for generating a frequency-modulated signal as the base signal (a).

This invention discloses a hemispherical resonator gyroscope control system with self-calibration of scaling factor, comprising a gyroscope head, an X-channel detection circuit, a Y-channel detection circuit, a Y-channel analog-to-digital converter (ADC) circuit, an X-channel ADC circuit, an FPGA, an amplitude ADC circuit, an orthogonal ADC circuit, a force balance ADC circuit, an amplitude drive circuit, an orthogonal drive circuit, a force balance drive circuit, and an analog switch. The FPGA controls the force balance ADC circuit and the force balance drive circuit to periodically generate a force balance control signal and a calibration signal. After selection by the analog switch, the force balance control signal and the calibration signal are applied to the drive plate and the detection plate of the gyroscope head, respectively. The calibration signal is converted into a digital quantity by the X-channel detection circuit and the X-channel ADC circuit and sent to the FPGA. After digital demodulation, the amplitude information of the calibration signal is obtained, and this amplitude information is used to calibrate the scaling factor of the gyroscope. This invention has the advantages of high calibration accuracy and continuous angular velocity signal.

Systems and methods for asynchronous data flow in digital radios are provided. In one aspect, a demodulator circuit includes a receiver circuit configured to receive: a plurality of samples of a radio frequency signal received from a tuner, a clock, and a target size value, the receiver circuit further configured to output the samples at a first rate based on the target size value. The demodulator circuit also includes a sample rate converter configured to receive the samples from the receiver circuit and output the samples at a second rate based on a rate offset value, and a buffer configured to receive the samples from the sample rate converter and output the samples. The demodulator circuit further includes a digital demodulator configured to receive the samples from the buffer and demodulate the samples, and a control loop configured to generate the target size value.

This invention discloses a detection method for a marine magnetic field sensor based on diamond NV centers, comprising: S1 baseline calibration; S2 alternating fluorescence measurement between two single-quantum resonance frequencies and taking the difference to achieve DQ readout; S3 adjusting the triaxial compensation current based on closed-loop control to maintain the NV operating point at zero magnetization bias; S4 obtaining background magnetic field changes through digital demodulation and adaptive filtering; S5 calculating the gradient based on the spatial difference of multi-point light spots, and combining threshold and spectral matching methods to determine the presence and trajectory of the submersible. The threshold is calibrated based on existing submersible magnetic field characteristics, and the short-time Fourier transform signal spectrum is compared with known submarine characteristic spectrum data. If the similarity exceeds the set threshold, an alert is issued. The detection method of this invention can improve measurement accuracy and anti-interference capability, and is suitable for real-time monitoring of weak magnetic anomalies (such as submersible magnetic moment disturbances).

The application provides a capacitive sensor circuit and a signal processing method based on recursive least square demodulation, and belongs to the technical field of weak signal processing circuits.The application solves the problems of the existing capacitive sensor signal processing circuit, such as the great influence of the output precision by the stability of the reference capacitor, the great resistance thermal noise under high gain, the great interference introduced by the parasitic capacitance of the input end, the great temperature drift of the traditional analog phase-sensitive detection circuit and the slow dynamic response.The circuit comprises an excitation signal input interface, a sensor probe interface, an alternating excitation capacitive voltage conversion module, a high-precision digital demodulation module and a power supply interface.The demodulation method comprises the following steps: step S1, parameter initialization;step S2, input vector construction;step S4, parameter updating;and step S5, output of the demodulation value.

The application discloses a wideband radio frequency transmitting channel amplitude and phase fluctuation correction system based on photonic deskewing reception, belongs to the technical field of microwave photon radars, and solves the problem of how to correct the amplitude and phase fluctuation of a wideband radio frequency transmitting channel. The input end of the wideband radio frequency transmitting channel is connected with the output end of a digital demodulation parameter extraction unit, the output end of the wideband radio frequency transmitting channel is connected with the input end of a wideband photonic deskewing reception link, and the output end of the wideband photonic deskewing reception link is connected with the input end of the digital demodulation parameter extraction unit. The wideband radio frequency transmitting channel is used to generate a radio frequency wideband LFM signal, the wideband photonic deskewing reception link is used to convert the radio frequency wideband LFM signal into a low intermediate frequency point frequency signal for digital collection, the digital demodulation parameter extraction unit is used to demodulate the amplitude and phase fluctuation information of the transmitting channel carried in the radio frequency wideband LFM signal, generate channel amplitude and phase correction parameters, and realize the amplitude and phase fluctuation correction of the wideband radio frequency transmitting channel in the form of digital pre-distortion.

The invention belongs to the technical field of eddy current sensors, and particularly relates to an eddy current sensor signal processing method and system based on digital demodulation, and the method comprises the steps: obtaining an original induction signal collected by an eddy current sensor; generating a standardized signal through a wavelet packet transformation algorithm; based on a self-adaptive digital demodulation algorithm, orthogonal synchronous demodulation is carried out, a baseband signal is output, and a variational mode decomposition and dynamic threshold suppression algorithm is adopted to carry out layered suppression on residual noise, so that a pure target characteristic signal is obtained; original characteristic parameters are deduced according to the pure target characteristic signals, meanwhile, a self-learning calibration model is constructed, and optimized characteristic parameters are obtained; in combination with real-time environment parameters, calibration is carried out through a temperature and humidity two-parameter linkage calibration algorithm, and a signal processing result and a real-time dynamic oscillogram are generated based on calibrated characteristic parameters. Therefore, the problems that in the prior art, the noise suppression capability is insufficient, and the demodulation precision is greatly influenced by frequency and phase drift are solved.

An impedance measurement system comprising: a signal generator incorporating a memory and configured to generate a digital test signal and at least one digital demodulation signal based on the memory, wherein the digital test signal has a first frequency and the at least one digital demodulation signal has the first frequency; a single pin for supplying an analog test signal based on the digital test signal to a device under test (DUT) and for measuring an analog input signal in response to the supply of the analog test signal to the DUT; and a demodulator configured to obtain: a first filtered digital signal based on the input signal; and the at least one digital demodulation signal to generate at least one digital demodulated signal indicating the impedance.

The application discloses a kind of concrete construction quality on-line monitoring system and method based on distributed optical fiber, and the on-line monitoring system includes narrowband light source, first optical fiber coupler, acoustooptic modulator, erbium-doped fiber amplifier, band-pass filter, three-port circulator, sensing fiber array, optical fiber polarization beam splitter, polarization optical fiber coupler, first balanced photodetector, second balanced photodetector, self-coherent mixing unit, data acquisition device, dynamic filter unit, digital demodulation unit, base frequency multiplication combined fading noise identification unit and time-frequency analysis unit, time-frequency analysis unit analyzes the time course change of phase signal after noise elimination, obtains the vibration signal change trend of each point of concrete.The monitoring system of the application uses sensing fiber array arranged in structure, has many measuring points, high sensitivity and phase vibration analysis accuracy of optical fiber sensing system, accurate full-distributed defect identification, good stability and durability, simple implementation.