337 results about "Modulation demodulation" patented technology

The invention is suitable for the technical field of data processing, and provides an illumination lamp data transmission system, which comprises a plurality of illumination lamps, a plurality of PLC concentrators respectively connected with the illumination lamps on an electric power circuit in a region where the illumination lamps are located, LPWAN gateways connected with the PLC concentrators, and a monitoring center communicating with the LPWAN gateways through an LPWAN network. The lighting lamp is provided with a data acquisition module and a PLC module; the PLC concentrator is provided with a modulation-demodulation module, an error detection module and a data forwarding module; the LPWAN gateway is provided with a data coding module, a data packaging module and an LPWAN communication module; the monitoring center comprises a data receiving module, a decoding processing module and a data processing module. The problem that an existing lighting lamp is poor in data transmission signal stability in a special environment where communication is inconvenient is solved.

The utility model discloses a cluster channel machine based on RF Transceiver software radio, which comprises an FPGA, a DSP, an ARM, a clock management chip, an LNA, a PA, a DSA and a SAW Filter, the FPGA is respectively connected with the DSP, the ARM, a Flash3 and the clock management chip, the DSP is connected with an SDRAM1 and a Flash1, the ARM is connected with an SDRAM2 and a Flash2, the clock management chip is connected with a TCXO, the cluster channel machine comprises an RF Transceiver connected with the FPGA and the clock management chip, the input end and the output end of the RF Transceiver are both connected with the SAW Filter, and the input end and the output end of the RF Transceiver are connected with the LNA, the PA, the DSA and the SAW Filter. And the LNA, the PA, the DSA, the SAW Filter and the RF Transceiver are sequentially connected and arranged to form an RF RX receiving channel and an RF TX transmitting channel. According to the utility model, the circuit of an RF transmitting and receiving channel is simplified, multiple paths of radio frequency signals can be directly adopted, the radio frequency signals from 300MHz to 6GHz are output, and the functions of digital filtering, digital up and down converters, digital combination, modulation and demodulation, automatic power control and the like are integrally realized; different functions can be realized by loading different waveforms, different requirements can be met without changing hardware, the cost, the power consumption and the size are reduced, the debugging process is reduced, and the production is more convenient.

The invention discloses a multi-carrier multi-system differential chaos shift keying modulation and demodulation method and system based on improved code index modulation, and relates to the technical field of communication signal processing. The method comprises the following steps: at a sending end, converting information to be transmitted into N groups of parallel information, dividing each group into index bits and modulation bits, converting each group of index bits into decimal numbers, and modulating the modulation bits; acquiring a reference signal; the reference signal and the information signal are multiplied by a carrier and transmitted into a channel. At a receiving end, the reference signal and the information signal are recovered through multi-carrier demodulation; the method comprises the following steps: multiplying an information signal by a Walsh code, performing related demodulation on a sequence of a reference signal and the information signal, obtaining a sequence number with maximum energy in the information signal, recovering a code index value, converting the code index value into a binary number, recovering an index bit, obtaining a related demodulation result, demodulating and recovering a modulation bit, and outputting original information after conversion. According to the invention, the problems of high bit error rate, poor bit error rate performance and low data rate of the existing MC-DCSK modulation and demodulation method can be solved.

The invention provides a carrier modulation method and modulation-demodulation system for an MMC circulation suppressor, and the method comprises the following steps: obtaining MMC operation log data, carrying out the spectrum analysis, and extracting the spectrum amplitude distribution characteristics; identifying a bridge arm circulation condition based on the amplitude distribution characteristics, and further detecting bridge arm load abnormity and unit energy abnormity conditions; identifying a circulating current frequency component according to an energy abnormal condition, performing electric energy quality attenuation detection and initial circulating current position tracing, and determining a circulating current generation mechanism; and finally, based on the risk assessment result and the generation mechanism data, constructing a modulation parameter, and generating an adaptive circulation suppressor carrier modulation strategy. Compared with the prior art, the method has the following beneficial effects: through modulation of the circulating current suppressor, modulation of the circulating current suppressor is more accurate, so that the problems of inaccurate analysis of a bridge arm circulating current generation mechanism and inaccurate analysis of an energy abnormal condition of the MMC unit existing in carrier modulation of a traditional circulating current suppressor are solved.

The invention discloses a simulation verification method for an ASIC (Application Specific Integrated Circuit) control loop of a metal micro-resonance hemisphere-like gyroscope. The method comprises the following steps: based on an input angular velocity and a control signal, generating a vibration signal of a harmonic oscillator by using a pre-constructed dynamics simulation model; modulating and demodulating the vibration signal through a signal modulation and demodulation module, extracting a low-frequency component and removing high-frequency noise to obtain a parameter representing a modal precession state; an antinode control signal and a wave node control signal are generated through a PID controller module based on the parameters representing the modal precession state; an antinode control signal and a wave node control signal are decomposed to an orthogonal direction through a coordinate transformation and combination module to generate a driving signal, and the driving signal is applied to a harmonic oscillator to form a closed-loop self-excitation driving control loop; and verifying the dynamic performance of the closed-loop self-excitation driving control loop in a simulation environment. The technical problems of high power consumption, complexity and development cost of simulation verification are solved.

The invention relates to a laser automatic frequency locking control system and method based on cold atom feedback and a matched spectrum, the system comprises a laser module, a spectrum module, a photoelectric detector, a modulation-demodulation module, a digital PID controller and a data acquisition and operation platform, and the output end of the laser is connected with the spectrum module; the detection light output by the spectrum module enters the modulation-demodulation module after passing through the photoelectric detector; an output signal of the modulation-demodulation module enters a digital PID controller, and the digital PID controller is connected with a laser for frequency scanning control and is in two-way communication with a data acquisition and operation platform through a data interface; the data acquisition and operation platform comprises a cross-correlation algorithm processing module, a frequency control logic module, a cold atom feedback processing module and an abnormity management module, and is used for calculating, feeding back, controlling and monitoring the system operation state in real time and completing the automatic frequency locking process. According to the invention, the accuracy of frequency locking point identification and the frequency locking efficiency are improved; and automatic relocking can be achieved, and long-term stable frequency locking operation is guaranteed.

The invention relates to the field of mining laser gas detection, in particular to a modulation and demodulation method and system for carrier noise suppression, and the modulation and demodulation method comprises the following steps: S1, generating a driving current sequence through a laser gas sensor; s2, collecting a light intensity sequence to carry out data reconstruction; s3, extracting a harmonic signal, sending the reconstructed sequence into a lock-in amplifier, and respectively extracting a second harmonic signal and a first harmonic signal; and S4, detecting the gas concentration through the ratio by using the mapping relation between the gas concentration and the ratio of the second harmonic signal to the first harmonic signal. According to the method, a continuous data discrete reconstruction technology is introduced into a modulation and demodulation process, and a reference time sequence is generated by utilizing the characteristics of a laser output signal, so that self-matching and dynamic adjustment of modulation frequency are realized, external signal interference is effectively avoided, and the harmonic extraction stability is improved; meanwhile, the hardware structure is simplified, and the adaptability of the system to different gas absorption spectral lines is enhanced.

The invention belongs to the technical field of quantum precision measurement, and particularly discloses a frequency stabilization system and a frequency stabilization method for an external cavity semiconductor laser. The system comprises a saturated absorption spectrum module, a wavelet peak searching module, a modulation and demodulation module, a bias amplification module and a switch module, wherein the saturated absorption spectrum module outputs an electric signal of a saturated absorption spectrum; under the control of the frequency locking instruction, the wavelet peak searching module outputs a target bias voltage signal corresponding to the locking frequency based on the electric signal; the modulation and demodulation module performs signal modulation and demodulation based on the electric signal and a reference signal corresponding to the locking frequency to output a modulation signal and a demodulation signal; and the bias amplification module performs superposition and amplification processing on the modulation signal, the demodulation signal and the target bias voltage signal, and outputs a target superposition signal to a PZT modulation port of the laser, so that the output laser freely operates on the locking frequency. According to the invention, the laser is not liable to generate mode hopping in the frequency locking process, the whole frequency stabilization system is more stable, the structure is simple, and the cost is low.

The invention discloses a seismic data acquisition device based on a ground 3C-DAS optical cable and an acquisition method thereof, is applied to the field of seismic exploration, and aims to solve the problems of high layout cost, too long construction time and low operation efficiency of an existing ground three-component detector. According to the method, a 3C-DAS armored optical cable is buried under a shallow earth surface in a parallel or orthogonal mode, a ground multichannel low-frequency DAS modulation-demodulation instrument collects phase data of Rayleigh scattering light reflected back from the 3C-DAS armored optical cable and carries out modulation-demodulation processing, and high-density distributed three-component seismic data distributed along the 3C-DAS armored optical cable is obtained; according to the system, high-density distributed three-component ground seismic data along the armored optical cable can be rapidly and efficiently acquired at low cost; the invention also provides a processing method for the collected high-density distributed three-component ground seismic data, an analysis method for a shallow surface velocity structure with high spatial resolution, and an inversion imaging method for longitudinal waves, transverse waves and surface waves.

The embodiment of the invention provides a chip atomic clock based on a speed grating spectrum and an implementation method. Comprising a multi-frequency coherent laser source, a quarter-wave plate, an atomic gas chamber, a photoelectric detector, a band-pass filter, a microwave modulation and demodulation module, a crystal oscillator, a phase-locked loop module, a bias-tree module, a DC modulation and demodulation module and a servo control module. The multi-frequency coherent laser source is sequentially connected with the quarter-wave plate, the atomic gas chamber, the photoelectric detector and the band-pass filter, the first output end of the band-pass filter is sequentially connected with the microwave modulation and demodulation module, the crystal oscillator and the phase-locked loop module, and meanwhile the microwave modulation and demodulation module is connected with the phase-locked loop module. And the second output end of the band-pass filter is connected with the DC modulation-demodulation module and the servo control module in sequence. And the bias-tree module is connected with the servo control module and the phase-locked loop module and feeds back a coupled signal to the multi-frequency coherent laser source so as to complete whole clock locking. The atomic clock is used for achieving the effect of improving the spectral line signal-to-noise ratio.

The invention discloses a gas leakage detection imaging device and method based on a single photon detection technology, and belongs to the technical field of gas detection and imaging. Aiming at the limitation problems of the existing gas leakage detection technology in the aspects of sensitivity, response speed, space imaging capability and anti-interference capability, nanosecond modulation control and synchronous photon counting are realized by utilizing an FPGA (Field Programmable Gate Array) through a visual gas detection imaging device combining an SPAD (Single Program Amplifier) array detector and a WMS modulation-demodulation mechanism; and the second harmonic of the absorption signal is further extracted by combining digital phase-locked amplification, so that gas leakage three-dimensional imaging with high spatial resolution, ppb-level sensitivity, strong background suppression capability and high time response is realized. The system has the advantages of high detection sensitivity, real-time imaging capability with high spatial resolution, high background light interference resistance and high signal-to-noise ratio, the demodulation method is novel, and the modular design has multi-gas compatibility and system expansibility.

The invention discloses a stone cultural relic crack filling slurry curing process parameter in-situ online detection method, which comprises the following steps: respectively preparing an optical fiber temperature-sensitive sensor, an optical fiber strain sensor and an optical fiber humidity-sensitive sensor by adopting an optical fiber Bragg grating, and integrally packaging each sensor to obtain a filling slurry curing process parameter detection device; a plurality of prepared filling slurry curing process parameter detection devices are adopted and are vertically placed at different height positions in the cracks of the stone cultural relics respectively, each filling slurry curing process parameter detection device is connected to a corresponding signal input end of a modulation-demodulation instrument, and when filling slurry is injected into the cracks of the stone cultural relics, the modulation-demodulation instrument is connected with the corresponding signal input end of the modulation-demodulation instrument. Drift data of center wavelengths corresponding to all sensors in all filling slurry curing process parameter detection devices are collected through a modulation-demodulation instrument and demodulated; and then demodulated data information is transmitted to a computer, and the computer calculates parameters of the filling slurry curing process at different height positions of the stone cultural relic crack.

A spatial adaptive multi-user service modulation and demodulation method suitable for various channel environments is characterized in that an uplink channel is configured with multiple paths of general carriers and multiple paths of helicopter special carriers in a frequency division mode, and the general carriers support uplink adaptive information transmission of terminals of various types and sizes in an MF-TDMA (Multimedia Frequency-Time Division Multiple Access) system; the on-satellite demodulator obtains a modulation coding mode of a burst data segment by identifying mode word information in a physical layer frame header, and demodulates a corresponding mode; the carrier special for the helicopter uses a continuous carrier mode, and multi-rate channel error correction coding and decoding under rotor wing shielding are supported in a channel interleaving mode. Downlink transmission is carried out in a fixed time slot and free time slot time division mode, and downlink information transmission for universal multi-type terminals and helicopter terminals can be supported at the same time. Compared with a common spatial modulation and demodulation method, the modulation and demodulation scheme provided by the invention can support adaptive transmission of general services of multiple types of terminals and helicopter service information on both an uplink and a downlink by using one satellite-borne modem.

The invention relates to a safety online monitoring system of an underwater production system protection facility and a design method. The system comprises a sensor group, a data transmission cable, a modulation and demodulation terminal and a data acquisition and analysis server. The sensor group comprises a plurality of sensors, and each sensor is arranged on a layout point of the protection facility; one end of the data transmission cable is connected with each sensor; the modulation-demodulation terminal is connected with the other end of the data transmission cable; the data acquisition and analysis server is connected with the modulation and demodulation terminal, and is used for acquiring and analyzing the stress condition of the protection facility monitored by the sensor; the dynamic strain and static strain of the underwater production system protection facility can be tested, data support is provided for judging the state of the protection facility, impact vibration and strain of the underwater protection facility can be monitored in real time, and data support is provided for safety and service life evaluation of the underwater system protection facility.

The invention discloses a digital measurement and control circuit of a resonant accelerometer based on an orthogonal phase-locked loop. Comprising an FPGA core board, an ADC / DAC board card and a gauge outfit analog interface board, and the high-precision resonant accelerometer is driven and detected through digital closed-loop control. The implementation method comprises the following steps: after capacitance / voltage conversion, modulation and demodulation and filtering, a resonator displacement signal is acquired by a high-precision ADC and input into an FPGA, a driving signal generated by the FPGA through an orthogonal phase-locked loop and an automatic gain control module is output through a DAC, and the driving signal is applied to a resonator driving end after shunt superposition of a direct current quantity. The digital quadrature phase-locked loop is adopted to replace a traditional phase-locked loop, the contradiction between dynamic response and noise suppression is solved, and the digital quadrature phase-locked loop has the advantages of being high in phase control precision, wide in capture bandwidth, high in anti-interference performance and excellent in compatibility.

The invention provides a power converter and a control circuit and method thereof, and the method comprises the steps: carrying out the modulation processing of the obtained switching frequency information and / or current reference information at a secondary side of the power converter, generating a reference pulse signal, and transmitting the pulse signal to a primary side through a digital isolator, therefore, a primary side control signal can be obtained after corresponding demodulation processing is carried out on the reference pulse signal on the primary side, and control over the on-off state of a primary side power tube is achieved. According to the scheme of the invention, through special modulation and demodulation setting, various kinds of information can be transmitted between the secondary side and the primary side only through a single channel, the use number of isolation devices between the primary side and the secondary side is reduced, the system structure is simplified, and the system cost is reduced.

The invention discloses a dynamic reconfigurable signal processing platform based on a ZYNQ architecture, and belongs to the technical field of digital signal processing, and the dynamic reconfigurable signal processing platform comprises a channel preprocessing unit, a high-speed AD sampling unit, a ZYNQ-PL logic unit and a ZYNQ-PS algorithm processing unit. A radio frequency signal is fed in from an antenna end and then enters the channel preprocessing unit, a balun circuit and a filter bank are adopted to carry out preselection filtering, amplification and conditioning on the radio frequency signal, and the signal is extracted and sent to the high-speed AD sampling unit; the high-speed AD acquisition unit converts a received analog signal into a digital signal and transmits the digital signal to the ZYNQ-PL logic unit, and the ZYNQ-PL logic unit is connected with the ZYNQ-PS algorithm processing unit through an AXI bus; wherein the ZYNQ-PL logic unit is composed of a static region and three dynamic regions, and is mainly used for realizing a logic part of a functional waveform and completing reconstruction and loading of the functional waveform; and the ZYNQ-PS algorithm processing unit completes algorithm processing, realizes modulation and demodulation of a functional waveform and realizes a functional algorithm.

The invention relates to a high-integration electric energy meter based on a multimode communication metering SOC chip, and belongs to the field of electric meter metering. The electric energy meter comprises a chip, and a radio frequency antenna, an HPLC (High Performance Liquid Chromatography) line driving module, an Ethernet modulation-demodulation module and a signal acquisition module which are externally connected with the chip. A communication signal on a power line reaches the HPLC AFE through the coupling circuit and the filter, and is processed by the MCU after being demodulated; an electric power signal reaches an electric power metering ADC after signal acquisition, is quantized and then is sent to a DSP, active power and reactive power are calculated and stored in an SRAM, and operation information, fault information and electric energy information of an electric meter are sent out through Bluetooth under the control of an MCU after being encrypted by an encryption and decryption module and a chip ID storage module, or pass through an HRF MACamp; and after being modulated by the PHY, the signal is sent out through the high-speed radio frequency transceiver, or after being modulated by the HPLC AFE, the signal is amplified by the driving module and then is coupled to a power line through the coupling circuit.

The invention discloses an optical fiber coiled tubing underground fluid monitoring system and method based on an AI large model, the system comprises an optical fiber sensing composite modem, a coiled tubing body and an underground fluid monitoring data processor, the optical fiber sensing composite modem is installed near a ground wellhead, the coiled tubing body is arranged underground, and the underground fluid monitoring data processor is connected with the optical fiber sensing composite modem. The underground fluid monitoring data processor is arranged near a ground wellhead; according to the invention, the function of long-term real-time dynamic monitoring of an oil and gas production well is realized, and analysis, processing and statistics can be carried out on underground fluid optical fiber monitoring data based on an AI big data model for a long time, so that an indispensable means, system and method are provided for scientific management of oil and gas reservoirs and improvement of the recovery ratio; the device also has a well-ground time-shifting combined three-dimensional exploration function, realizes time-shifting monitoring of dynamic changes of underground oil-water two-phase and oil-gas-water three-phase fluid interfaces in the oil-gas production process, and is suitable for wide popularization and application.

The invention discloses a network access system based on 5G CPE. The network access system comprises a 5G cellular module and a small optical line terminal module, the 5G cellular module comprises a modulation-demodulation unit and an application processor unit; the application processor unit is connected with the small optical line terminal module through a network interface; the modulation and demodulation unit is used for receiving a 5G network signal sent by an operator base station and converting the received 5G network signal into a signal which can be used by user equipment; and the small optical line terminal module is used for managing network access of the optical network unit of the user equipment, performing photoelectric conversion on a signal which can be used by the user equipment after the optical network unit of the user equipment realizes network access, driving the optical splitter to emit light according to the converted signal, and sending the light to the user equipment. And the optical splitter transmits the converted signal to an optical network unit of the user equipment through an optical fiber. According to the invention, high-efficiency, low-cost and high-speed network access can be realized.

A power and communication transmission arrangement includes an electronic accessory having a first modulator / demodulator. A motor vehicle includes a charging system to provide a power signal to the electronic accessory. At least one electrical conductor carries the power signal from the charging system to the electronic accessory. An infotainment system bi-directionally communicates with the electronic accessory. A second modulator / demodulator modulates the power signal based upon first signals received from the infotainment system to form first modulated power signals such that the first modulator / demodulator demodulates the first modulated power signals to extract the first signals for use in the electronic accessory. The first modulator / demodulator modulates the power signal based upon second signals from the electronic accessory to form second modulated power signals such that the second modulator / demodulator demodulates the second modulated power signals to extract the second signals for use in the infotainment system.

A wide-spectrum modulation-demodulation type imaging spectrum chip and a production method therefor, relating to the technical field of semiconductor optics. From top to bottom, the chip sequentially comprises: a wide-spectrum modulation structure layer, comprising wide-spectrum modulation structure units, wherein the plane views of the wide-spectrum modulation structure units in the x-z plane are in two C shapes, the openings of the two C shapes are oppositely arranged in a mirror image mode, and the wide-spectrum modulation structure layer is used for modulating incident light information; a photoelectric image sensor module, used for collecting modulated incident light information, and converting the modulated incident light information into a digital electrical signal; and a spectral image demodulation module, used for demodulating the digital electrical signal to generate target multispectral image information.

The invention provides a decoupling phase closed-loop locking nuclear magnetic resonance gyroscope, and particularly relates to a nuclear magnetic resonance gyroscope based on modulation and demodulation of an alternating current reference line magnetic field, which is characterized in that an alternating current reference modulation magnetic field different from nuclear spin resonance frequency is applied along the direction of detection light; meanwhile, alternating current modulation is conducted on the decoupling phase of the nuclear magnetic resonance gyroscope electron paramagnetic resonance magnetometer, alternating current reference modulation amplitude changes are demodulated, a decoupling phase error signal is obtained, and real-time closed-loop locking of the decoupling phase is achieved through a closed-loop control system based on the error signal. According to the invention, real-time closed-loop locking of the decoupling phase of the nuclear magnetic resonance gyroscope can be realized, and decoupling phase fluctuation caused by fluctuation of system parameters such as laser power, frequency and air chamber temperature is inhibited, so that the angular rate measurement precision and long-term stability of the nuclear magnetic resonance gyroscope are improved. According to the technical scheme, the technical problems that in the prior art, a double-shaft differential detection method is prone to being affected by amplitude fluctuation, large errors exist, and operation is complex are solved.

The invention provides an OTFS-based secret key generation method and system, and relates to the field of physical layer security, and the method comprises the steps that based on multiple rounds of channel detection between a master node and a slave node, the two nodes respectively execute the following operations by using respective received signals: based on the received signals, channel estimation is performed, and by using a channel estimation result, a secret key is generated; estimating a channel state information vector of the delay Doppler domain; performing decorrelation transformation on the estimated channel state information vector; and mapping the channel state information vector subjected to decorrelation transformation into a corresponding quantization interval, dynamically generating a coding index by adopting a self-adaptive index adjustment mechanism according to an index of the quantization interval, extracting high-order bits from a Gray code corresponding to the coding index, and generating a local shared key. According to the method, OTFS modulation and demodulation are used for physical layer key generation, autocorrelation caused by OTFS is solved through decorrelation transformation, and the efficiency, robustness and consistency of key generation in a mobile communication scene are improved.

The invention discloses a distributed sound wave sensing device based on PDH frequency locking and a demodulation method. The distributed sound wave sensing device comprises a narrow linewidth laser, a first optical fiber coupler, a heterodyne phase sensitive optical time domain reflectometer and a frequency stabilization feedback module. The frequency stabilization feedback module comprises a frequency stabilization modulation and demodulation module, a reference cavity and a server; the frequency stabilization modulation and demodulation module comprises an electro-optical modulator or an acousto-optical modulator, a photoelectric detector, a multiplier and a low-pass filter; the first path of light enters a reference cavity for resonance after being modulated by an electro-optical modulator or an acousto-optical modulator, a resonance signal enters a photoelectric detector through cavity reflection, and a signal output by the photoelectric detector is subjected to signal demodulation by a multiplier and a low-pass filter and then is used as feedback to be input into a server for proportional-integral processing; the laser is fed back and output to a modulation interface of the narrow-linewidth laser, and frequency compensation is performed on the laser, so that the laser is locked on the reference cavity; according to the invention, through frequency stabilization and homologous modulation and demodulation, line width and phase drift of the laser can be suppressed at the same time.

The invention relates to the technical field of laser interference distance sensors, and discloses a modulation and demodulation method and system for a laser interference distance sensor, and the method comprises the steps: obtaining a carrier wave which carries out the phase modulation of an initial optical signal, and an interferometer photoelectric signal which is obtained through the distance detection of the initial optical signal; fourier transform is carried out on the interferometer photoelectric signal to obtain a Fourier transform result; respectively obtaining intensity values of a plurality of odd harmonics and a plurality of even harmonics of the Fourier transform result, a phase value of a pth odd harmonic and a phase value of a qth even harmonic, and calculating the number of the odd harmonics and the number of the even harmonics based on the intensity values and the phase values of the odd harmonics and the number of the even harmonics in combination with a theoretically calculated response function or calibration function. And resolving the phase transfer function, and calculating through the resolved phase transfer function to obtain the target distance information. According to the method, the demodulation process of each measurement point is independent, a filtering process is avoided, measurement errors caused by filtering are eliminated, meanwhile, large modulation depth is not needed, and the requirement for a modulator is reduced.

The invention discloses a hemispherical gyroscope driving detection circuit phase shift identification method, electronic equipment and a computer readable storage medium, and the method comprises the steps: controlling a DAC output end of a hemispherical resonator gyroscope main control chip to be connected with an input end of a pre-amplification detection circuit, calculating a driving signal in real time, and transmitting the driving signal to a driving electrode; detection signals of the detection electrode are collected in real time, phase shift identification parameters of the detection circuit are calculated according to all the detection signals of the detection electrode collected when the hemispherical resonator gyroscope is in a phase shift identification state of the detection circuit and a modulation-demodulation algorithm, and then the phase shift angle of the detection circuit is solved; the output end of the control drive amplification circuit is connected with the input end of the pre-amplification detection circuit, the same method is adopted to calculate and obtain the phase shift identification parameters of the drive circuit, and the phase shift angle of the drive circuit is solved. According to the invention, the phase shift of the driving circuit and the detection circuit is separated and identified, so that the influence of the phase shift of the circuit on the null shift of the harmonic oscillator is reduced, and the null-bias stability of the hemispherical gyroscope is greatly improved.

The invention provides a dynamic monitoring system and method for a submarine optical cable array reservoir, which is applied to the technical field of marine geophysical prospecting, and comprises a wet-end subsystem positioned underwater and a dry-end subsystem positioned on a base bank, the dry end subsystem comprises a light source module used for generating an optical signal; the modulation transmitting module is used for modulating the optical signal to obtain modulated pulse light; the underwater wet end subsystem comprises an optical cable transmission module used for transmitting modulation pulse light; the optical fiber four-component node module is used for dynamically and continuously monitoring the reservoir for a long time, and modulating the acquired sound pressure signal and the triaxial vibration signal onto the modulated pulse light in response to the received modulated pulse light to form a return light signal; the dry end subsystem further comprises a modulation-demodulation module used for receiving the return optical signal and demodulating the return optical signal to obtain four-component monitoring data. According to the invention, sound pressure and three-axis vibration response can be integrated on the same node, and passive four-component synchronous acquisition is realized.

The present invention provides a pointer data buffering modulation and demodulation method and system for oil drilling, relating to the field of wireless communication technology, including: constructing a pointer data buffer pool, which is a nonlinear topological cache structure for receiving data stream inputs from multiple sensors; performing quality scoring through a data quality analyzer to establish data priority tags; obtaining the current state of the pointer data buffer pool, inputting it into a modulation control channel, and generating a dequeue order; performing state prediction, and generating an active compression instruction if a preset percentage threshold is met; performing cluster compression; and performing modulation and demodulation management based on the cluster compression results and the dequeue order. The present invention solves the technical problem in the prior art that single-chip microcomputers used for oil drilling have limited processing power, making it impossible to efficiently execute complex data modulation and demodulation algorithms, thereby limiting the real-time and accuracy of data processing during drilling operations.

The invention discloses a time-frequency signal security bastion host which comprises an input module, an output module, a signal modulation and demodulation module, an identity authentication module, an equipment management module, a power management module, a signal security detection module, an equipment security audit module and a security login management module. Intranet and extranet isolation is carried out on extranet standard time-frequency signals and intranet time-using equipment through the time-frequency security bastion host, high-precision time-frequency security time service and output of intranet time synchronization signals are achieved, the accuracy of high-precision time frequency and the non-tampering property of standard time are guaranteed, and credible transmission of high-precision standard time is achieved.