472 results about "Modulation demodulation" patented technology

The invention belongs to the technical field of airborne radio frequency equipment testing, and particularly relates to a comprehensive simulation test system and method for airborne radio frequency equipment, and the system comprises a man-machine interaction unit, a comprehensive radio frequency rack unit, a power supply and control unit, and a cabinet matching test cable. Broadband radio frequency signal processing, waveform modulation and demodulation, audio analysis processing and data storage and recording of each airborne radio frequency device are realized through the integrated radio frequency rack unit; and signal processing and channel switching functions are realized through the intermediate frequency switching matrix module and the broadband radio frequency front-end processing module, so that different to-be-tested systems and radio frequency signals can be matched. According to the invention, a software radio technology is adopted, a software dynamic loading reconstruction scheme is adopted on a general radio frequency hardware platform to realize soft switching among different task functions of the airborne radio frequency equipment, a comprehensive simulation test on the complex airborne radio frequency equipment is realized, and the utilization rate of test resources is improved.

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 belongs to the technical field of wireless optical communication, and discloses a cross-domain relay type radio frequency-laser communication module and a communication method, and the cross-domain relay type radio frequency-laser communication module is provided with a node construction module, a relay module, a synchronous control module, a modulation-demodulation module and a situation awareness module. According to the invention, a large-scale MIMO technology, DMD structure light modulation and AWI signal modulation and demodulation technology are utilized to autonomously design a large-bandwidth and high-secrecy radio-light transmission conversion module; a high-precision synchronous control module is designed by using a GD32 chip, and low-delay and low-error-code relay type cross-domain information interconnection is ensured. Meanwhile, a high-sensitivity area array CCD detector is combined to sense the position of a light spot, an underwater speckle recognition alignment algorithm is developed based on YoLoV8, azimuth information is output to assist semi-active alignment, and then low-cost, low-time-delay, high-speed, long-distance and large-capacity all-weather cross-domain communication in complex water areas is achieved.

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 chip atom vector magnetometer based on a topological posture surface emitting laser. The device is characterized by comprising a topological posture PCSEL, a beam shaping unit, a polarizer, a quarter-wave plate, a voltage-controlled laser polarization rotator, an atomic gas chamber, a Wollaston prism, a dual-channel photoelectric detector, a filter module, a laser frequency stabilization unit, a precession signal modulation and demodulation module and a laser polarization and Larmor magnetic field direction adjustment module, the system comprises a two-dimensional Larmor magnetic field coil, a servo feedback module, a direct digital frequency synthesis module and a high-stability crystal oscillator. The topological posture laser is used for the chip atom vector magnetometer, magnetic vector parameter measurement which is more immune to temperature fluctuation and more excellent in performance is innovatively achieved for an external magnetic field, complete information of the vector magnetic field can be measured at the same time, and the chip atom vector magnetometer can be used for the fields of material defect detection, mineral oil and gas exploration, underwater magnetic target positioning and the like.

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 discloses a bit error rate analysis method based on a non-full-load OCDM system, relates to the technical field of performance analysis of a wireless communication system, provides modulation and demodulation processes of the non-full-load OCDM system, and deduces and analyzes BER performance of the system. The method comprises the following steps: diagonalizing a time domain channel cyclic matrix, giving a general BER expression under single-path and two-path Rayleigh channels, and deducing a BER expression of a system under the single-path and two-path Rayleigh channels based on the general BER expression; the simulation result proves the effectiveness and accuracy of the BER theoretical value and the derivation of the upper and lower bounds of the BER theoretical value, and also proves the effectiveness and accuracy of the method disclosed by the invention.

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.

The invention discloses a square wave phase modulation and demodulation method and device for multi-wavelength interference displacement measurement, and the method comprises the steps: modulating the phase of a multi-wavelength optical fiber sensor through employing a square wave signal, and generating an interference signal; and then, filtering, normalizing and normalizing the collected light intensity signal and the square wave modulation signal, and optimizing the signal through the steps of convolution operation, zero value elimination, half-cycle compensation and the like. And performing ellipse fitting by using the optimized signal to obtain parameters, and further performing numerical value correction on the signal. And finally, interference phase information is obtained through arc tangent operation, and accurate measurement of the displacement of the measured object is realized in combination with multi-wavelength composite calculation. The invention aims to realize a brand-new scheme for carrying out phase modulation and demodulation on the multi-wavelength optical fiber interference displacement sensor by using a square wave signal, the method is simple and convenient to operate, and the application of multi-wavelength optical fiber displacement interference measurement by using a phase carrier technology in a phase modulation and demodulation method is widened.

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 three-axis SERF atom magnetometer orthogonal frequency doubling modulation and demodulation system and method, and the system employs a signal generation module to generate sine and cosine orthogonal modulation signals with the frequency of fm to drive an X-axis magnetic field generation coil and a Y-axis magnetic field generation coil of an SERF atom magnetometer respectively, and generates sine signals with the frequency of 2nfm to drive a Z-axis coil. Open-loop magnetic field signals of X-axis magnetic field components, Y-axis magnetic field components and Z-axis magnetic field components are obtained through three groups of integral filters for full-period integration, driving current of a three-axis magnetic field coil is controlled through a control module to generate a compensation magnetic field, the open-loop magnetic field signals of the X-axis magnetic field components, the Y-axis magnetic field components and the Z-axis magnetic field components are made to be zero, and at the moment, the magnetic field intensity of the atomic gas chamber is zero. The compensation current output by the control module is the X-axis magnetic field intensity signal, the Y-axis magnetic field intensity signal and the Z-axis magnetic field intensity signal measured by the three-axis SERF atom magnetometer. The system can directly extract a three-axis magnetic field resolving signal from a beam of laser signals, eliminates the cross coupling effect during three-axis magnetic field resolving, improves the measurement range and orthogonality of the SERF atomic magnetometer, and has extremely high engineering application value.

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 belongs to but not limited to the technical field of surface analysis, and particularly relates to a dielectric material surface charge density and surface potential measurement method and device, and the method comprises the steps: S1, enabling a to-be-measured dielectric material to be subjected to an electrostatic force F through an external electric field, and transmitting the electrostatic force F to a compound pendulum frame through a sample support; s2, the pendulum frame of the compound pendulum rotates by an angle delta theta under the action of the electrostatic force F; s3, the angle delta theta is equal to the displacement x of a middle pole plate of the bottom capacitance displacement detection system; s4, the differential capacitance delta C of the two capacitors of the capacitance displacement detection system is in direct proportion to the rotation angle delta theta; and S5, after modulation and demodulation of the capacitance sensing circuit, the delta C is converted into a voltage output signal VO.

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.