1007 results about "Phase modulation" patented technology

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

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

The invention provides a preparation method of a barrier type antimonide infrared detector. The preparation method comprises the following steps: selecting a gallium antimonide substrate; a gallium antimonide buffer layer, an indium arsenide heavily-doped layer, a class II superlattice absorption layer and an aluminum-arsenic-antimony barrier layer are sequentially grown on the substrate in an epitaxial mode through a molecular beam epitaxy method; mechanically stripping the hexagonal boron nitride two-dimensional material, and transferring the stripped hexagonal boron nitride to the aluminum-arsenic-antimony barrier layer to form a Van der Waals heterojunction and composite barrier layer structure; depositing electrodes by using an ultraviolet lithography technology and a thermal evaporation mode to form one electrode arranged on the gallium antimonide buffer layer and the other electrode arranged on the boron nitride; a large-numerical-aperture micro-lens array is processed on a substrate, and the micro-lens array is composed of gallium antimonide cylinders with a phase modulation function; therefore, the antimonide medium-wave infrared detector with the composite barrier layer can be formed, the quantum efficiency is improved, the order of magnitude of dark current is reduced, and room-temperature medium-wave infrared detection can be realized.

The invention discloses a laser frequency stabilization system based on Faraday anomalous dispersion atomic filtering, which is used for carrying out frequency stabilization on phase modulation multi-sideband laser, and comprises a frequency doubling laser unit which is configured to comprise a fundamental frequency seed light source, an electro-optical modulator, a fundamental frequency amplifier and a frequency doubling crystal; the light splitting module unit is configured to split the frequency doubling light into a main output light path and a monitoring light path; the atomic optical rotation filter is located on the monitoring light path and is configured to maintain the purity of the frequency-stabilized laser spectrum through purification treatment under the control of the axial magnetic field and the temperature; the frequency stabilization unit is configured to be a frequency stabilization light path and a servo system, and the frequency stabilization light path is used for obtaining laser frequency information and generating an error signal; the servo system is used for controlling the frequency of the fundamental frequency seed light source according to the error signal feedback. According to the laser frequency stabilization system provided by the invention, the spectrum purification and frequency stabilization precision can be improved, so that high-frequency stability locking is realized.

The invention belongs to the technical field of power system operation and motors, and particularly relates to an energy storage type phase modifier control method which comprises the steps that a rotating shaft of a double-fed motor is connected with a flywheel to serve as an energy storage type phase modifier; the rotor winding is connected to a power grid through an excitation system and a transformer in sequence, and the excitation system is electrically connected by a reactor, a back-to-back converter and a filter in sequence; the stator winding is directly connected to a power grid; the control system decouples reactive power and active power, vector control is carried out on exciting current to absorb or release power, and reactive power-voltage support and active power-frequency support of the power grid are completed. The method overcomes the defects that a traditional direct-current excitation phase modulation mode can only modulate phase and cannot modulate frequency, or is cumbersome and slow in response. The system can meet the requirement of wide-range variable-speed operation, quickly store / release a large amount of rotor kinetic energy, inhibit the voltage and frequency fluctuation of a power grid, and is especially suitable for stations with high new energy occupation ratio. The invention also provides a non-transitory readable recording medium storing the program of the method and a system comprising the medium, and the program can be called through a processing circuit to execute the method.

An inertia cooperative control method of an integrated optical storage alternating current and direct current hybrid micro-grid comprises the steps that firstly, according to static and dynamic power capacities of energy storage units in direct current sub-grids and allowed direct current voltage deviation, sub-grid equivalent virtual resistance and virtual capacitance are calculated; secondly, RC + R type parallel virtual impedance parameters are distributed according to the power proportion of each energy storage unit, and multi-energy-storage cooperative response power disturbance according to the capacity is achieved; then, a phase angle is generated based on the mapping relation between direct-current side voltage and frequency, an alternating-current voltage amplitude instruction is determined in combination with reactive power droop control and feeder impedance voltage drop compensation, and a dq-axis voltage instruction is generated through virtual impedance compensation; normalized three-phase modulation waves are obtained through voltage-current double closed-loop control and dq / abc coordinate transformation, and six paths of PWM signals are generated to drive an interconnection converter after the normalized three-phase modulation waves are compared with triangular carrier waves. The method does not need to depend on external communication, has the capabilities of autonomous inertia support, voltage and frequency coordinated regulation and reasonable multi-source power distribution, and improves the stability and dynamic response performance of the system under island operation.

The invention discloses a switch cabinet electric arc light detection method and system based on multispectral fusion, and relates to the technical field of electric power system intelligent detection, and the method comprises the following steps: S1, building a cross-spectrum unified time reference, and carrying out the synchronous comparison of an infrared light signal, a visible light signal and an ultraviolet light signal, extracting a temperature transition trigger feature and a strong light disturbance spectrum feature, and generating a time synchronization deviation vector; and S2, constructing an anti-fact spectrum playback model based on the time synchronization deviation vector, generating a shadow spectrum sequence, positioning an infrared response threshold lifting reason through energy difference analysis, calculating a spectrum overlapping risk interval and duration, and outputting a threshold disturbance distribution diagram. According to the method, infrared anomalies are identified through cross-spectrum time alignment, anti-fact playback and differential analysis, channel recovery is guided in combination with springback prediction and time sequence correction, and a spectrum broken chain window is constructed through dislocation sampling and phase regulation and control, so that the accuracy and the anti-interference capability of arc identification are effectively improved.

The invention discloses a broadband and high-efficiency true time delay reflective array antenna, and belongs to the technical field of antenna engineering. Through the design of the broadband horn feed antenna, the broadband butterfly-shaped dipole antenna and the real-time-delay coaxial transmission line, high-efficiency directional radiation is realized. The gain bandwidth of the multi-layer patch type reflective array antenna is much larger than that of a traditional multi-layer patch type reflective array antenna; compared with a traditional transmission line phase modulation type reflective array antenna, due to stable time delay and shielding and no resonant structure, the antenna has better gain stability, and an in-band gain curve is increased approximately linearly. Finally, the antenna is simple in structure and can be realized only by a single-layer patch structure and a common coaxial transmission cable, and high-cost laminated patch processing is not needed.

The invention belongs to the technical field of grid-connected inverter harmonic analysis, and particularly discloses a grid-connected inverter harmonic closed-loop transmission analysis method and system considering broadband coupling. The method comprises the following steps: respectively establishing a harmonic component transfer function of each module; based on the harmonic component transfer function of the sampling module, calculating to obtain harmonic active power and harmonic reactive power input to the power outer loop control module; based on a harmonic component transfer function of the power outer loop control module, calculating to obtain a harmonic current component in a reference current signal output by a power outer loop; based on a harmonic component transfer function of a current inner loop control module, obtaining a three-phase modulation voltage harmonic component and an inverter port voltage harmonic component through coordinate inverse transformation; on the basis of the inverter port voltage harmonic component, a main circuit harmonic transfer equation is combined, and a grid-connected point harmonic current component is obtained through calculation; the method overcomes the defects that a traditional analysis method cannot consider the control of a whole loop by a closed loop, and the broadband coupling is insufficiently considered.

The invention belongs to the technical field of radar data processing, and particularly relates to a GPGPU-based time-varying target echo simulation method and device. Each thread in each Block in each Grid of the GPGPU is responsible for echo calculation of a target in a channel at each moment, and each echo calculation step comprises the following steps: S1, calculating an inherent frequency domain scattering coefficient of the target according to an incident angle of a radar to the target; s2, obtaining an inherent time domain scattering coefficient of the target through inverse Fourier transform; s3, carrying out amplitude-phase modulation on the inherent time domain scattering coefficient of the target; s4, calculating a target response signal based on the modulated time domain scattering coefficient; and S5, determining a time-varying target echo signal according to the target echo frequency, the time delay, the target Doppler frequency and the calculated target response signal. Important support is provided for testing and verification of a radar detection system, and the simulation effect is closer to a real scene.

The invention discloses an LCoS device and a phase modulation method of the LCoS device. The LCoS device comprises a transparent electrode, a liquid crystal layer, a metasurface layer and a back plate which are sequentially arranged from the incident end to the reflecting end. A projection included angle is formed between the long axis of the metasurface layer and the liquid crystal molecule director of the liquid crystal layer on a propagation plane; the liquid crystal layer is used for performing phase modulation on a parallel first polarization component of incident light, and the conversion metasurface is used for performing polarization state exchange on the parallel first polarization component and an orthogonal second polarization component of the incident light; the back plate is used for reflecting incident light; and the liquid crystal layer is used for performing phase modulation on the exchanged second polarization component, so that the emergent first polarization component and the emergent second polarization component are subjected to phase modulation. The metasurface layer is introduced, a polarization-dependent modulator is converted into a polarization-independent modulator through two times of liquid crystal layer passing and one time of polarization conversion, and the fundamental limitation of a traditional LCoS device is solved.

The invention provides a compensation method for asymmetric errors of a double-path weak measurement system and the double-path weak measurement system, which can be applied to the technical field of quantum measurement. The compensation method comprises the following steps: under the condition that wide-spectrum light passes through a double-path weak measurement system and the size of a signal which is weakly coupled with a weak coupling module is within a preset range, applying a square wave signal with a preset amplitude to a push-pull phase modulator, and performing binary detection by using an acquisition module to obtain four first detection signals; under the condition that the preset amplitude is not 0, determining a first error introduced by asymmetric loss of the double-path weak measurement system according to the corresponding four first detection signals; according to the four first detection signals corresponding to the square wave signal with the preset amplitude of 0 and the first error, determining a second error introduced by filter asymmetry of the double-path weak measurement system; according to the first error and the second error, asymmetric error compensation is carried out on the response formula, and it is ensured that the double-path weak measurement system has high sensitivity and stability.

The invention belongs to the technical field of power equipment fault diagnosis, and particularly discloses a knowledge distillation-based 1D-CNN online partial discharge identification method, which comprises the following steps of performing Fourier transform on an original signal and then implementing four data enhancements of amplitude modulation, phase modulation, frequency band enhancement and frequency domain noise injection; constructing a multi-branch one-dimensional convolutional neural network to extract time-frequency features, and training a teacher model in combination with residual connection and an SE attention mechanism; compressing the teacher model into a lightweight student model by adopting a knowledge distillation strategy of a preset temperature parameter and a weight coefficient; the student model is converted into a mobile terminal compatible format, and a mobile phone APP is established through a QT upper computer; and online real-time identification is realized. According to the method, the problem of sample imbalance is effectively relieved, in addition, the knowledge distillation realizes model volume compression and reasoning speed increase while keeping relatively high accuracy, the calculated amount is small, the real-time performance is high, and the precision is high.

The invention discloses a harmonic generation and beam control method and system based on an amplitude-phase regulation metasurface array. The method comprises the following steps of: constructing an amplitude-phase regulation and control metasurface array by adopting a digital control multi-channel radio frequency chip; based on a Fourier series and far field superposition model, calculating a time-varying amplitude phase sequence of harmonic waves and a phase gradient of beam pointing; the sequence is converted into a control signal through an FPGA, and each channel is modulated in real time; after an array receives a dot frequency signal, a target harmonic wave beam with a preset characteristic is radiated to a specified direction through periodic amplitude-phase modulation and space phase gradient processing. The system comprises an amplitude-phase regulation metasurface array construction module, a harmonic wave and beam control model construction module, a digital control signal generation loading module and a target harmonic wave generation radiation module, and is used for realizing the harmonic wave generation and beam control method. Accurate generation of any order of harmonic waves and flexible deflection of wave beams are achieved, the system integration degree, the regulation and control precision and the real-time performance are improved, and the application field is wide.

The invention particularly relates to an excitation signal waveform intelligent optimization method for a high-power narrow-linewidth fiber laser, and the method comprises the steps: obtaining an excitation signal, carrying out the processing of a phase modulation waveform of the excitation signal, and extracting an input feature set needed by frequency spectrum prediction; constructing a frequency spectrum prediction model based on the decoupling echo state network, inputting the input features into the frequency spectrum prediction model based on the decoupling echo state network, realizing nonlinear mapping between the phase modulation waveform of the excitation signal and the frequency spectrum response thereof, and obtaining a prediction frequency spectrum; constructing a composite cost function including a mean square error, a spectrum sideband leakage penalty term and a spectrum smoothing term based on the difference between the predicted spectrum and the target spectrum; based on a composite cost function, an Adam optimization algorithm is adopted to iteratively correct a phase waveform in a frequency domain, intelligent waveform optimization of phase modulation is realized, and a threshold value of a stimulated Brillouin scattering effect is reduced. The intelligent optimization of the phase modulation waveform of the excitation signal can be realized.

The invention relates to the technical field of phase adjustment, and discloses a synchronous phase modifier phase modulation method adopting a digital twinborn model, and the method comprises the steps: carrying out the modularization processing of a synchronous phase modifier, and obtaining a system module; identifying a power grid topological structure of the power system, and collecting load data, generator data and line parameters of the power system to construct a simulation model of the power system; integrating the system module and the simulation model to obtain an integrated model; performing impedance adjustment on the module integration system to obtain an impedance adjustment model; collecting system data of the synchronous phase modifier, and analyzing control characteristics of the synchronous phase modifier; and executing the phase adjustment reference of the impedance adjustment model by using the control characteristics, obtaining a digital twin model when the model precision meets the preset model precision, analyzing the real-time power data by using the digital twin model, and performing phase adjustment on the power system based on the analysis result. The accuracy of phase adjustment of the synchronous phase modifier can be improved.

The invention relates to the technical field of laser display, in particular to a laser speckle suppression waveguide structure, a laser display device and a speckle suppression method. The laser speckle suppression waveguide structure comprises a substrate layer, a lower cladding, a waveguide core area and an upper cladding which are stacked from bottom to top. Wherein the waveguide core region comprises an input section, an arc turning section and an output section; the arc turning section is used for combining laser beams from different input sections and outputting the combined laser beams from different output sections in parallel; the waveguide structure is also provided with a waveguide phase disturbance part used for destroying laser transmission coherence and / or an electrically tunable phase modulation part used for destroying laser dynamic coherence. The invention provides a waveguide structure for laser speckle suppression, a laser display device and a speckle suppression method, and aims to solve the problems that a speckle suppression scheme in the prior art is poor in suppression effect, large in system size, low in integration level, high in optical loss and incapable of dynamically adapting to different display scenes.

An optical computing device includes an optical computing section including a first transmissive optical modulation element having cells each having an independently set phase modulation amount. The first transmissive optical modulation element emits a signal light, in a signal direction, generated when transmitted light beams phase-modulated by the cells interfere with each other and a noise light, in a noise direction, transmitted through the first transmissive optical modulation element without being phase-modulated by the cells. The optical computing device includes an optical sensor that detects the signal light outputted from the optical computing section and generates an electrical signal indicating a result of the detection. The first transmissive optical modulation element is configured such that an impact that the noise light has on the electrical signal is smaller than the impact in a state where the signal direction aligns with the noise direction.

The invention discloses an antenna based on phase-only non-uniform time modulation, which comprises a shaped reflector antenna and a phase-only non-uniform time modulation array feed source, the shaped reflector antenna is used for forming cosecant square beams on a pitching surface, and the phase-only non-uniform time modulation array feed source is formed by a plurality of antenna unit arrays. Each antenna unit is cascaded with a time modulation module, and the phase-only non-uniform time modulation array feed source controls each antenna unit through a phase modulation waveform. According to the invention, a phase-only non-uniform time modulation array antenna is used as a feed source to irradiate and form a reflector antenna, and a cosecant square beam is formed on a pitching surface by using the beam forming capability of the reflector antenna, so that the cosecant square beam is formed on the pitching surface at extremely low cost; a phase-only non-uniform time modulation array feed source is utilized to realize low-sidelobe, high-precision and wide-angle scanning of a fundamental wave beam on an azimuth plane, so that two-dimensional high-gain wide-airspace beam coverage is realized.

The invention discloses an on-chip fully-integrated optical circulator based on phase modulation. The on-chip fully-integrated optical circulator comprises a substrate, a buried oxide layer, an optical waveguide layer, an upper cladding and a metal layer used for manufacturing metal electrodes, the substrate, the buried oxide layer, the optical waveguide layer, the upper cladding and the metal layer are stacked, the optical waveguide layer comprises two input / output optical waveguide groups, a four-port resonant cavity and two metal electrode pairs, and the metal layer comprises four modulation areas; four ports of the resonant cavity are respectively connected with four interfaces of the modulation area, each input / output optical waveguide group is connected by a bent optical waveguide and coupled to the resonant cavity, the middle of the metal electrode pair is bent to form a coplanar waveguide electrode, and the middle of each two ends of the modulation area is connected by the coplanar waveguide electrode. The fully-integrated optical circulator is realized under the silicon-based substrate for the first time, is compatible with current mainstream optical integration platforms such as SOI, LNOI and LTOI, and can be widely applied to large-scale photonic integrated chips, such as the fields of optical communication, optical sensing, on-chip optical interconnection and the like.

The invention provides a radar multi-target tracking and imaging echo simulation method and system, and belongs to the technical field of radar echo simulation. The method comprises the following steps of: pushing the position and the motion state of a radar platform and RCS point set data of a plurality of targets to an impact function generation FPGA (Field Programmable Gate Array), and latching data through the FPGA to form a multi-target data set when a radar signal is detected; point set data, postures and world coordinates of the targets in the multi-target data set are split into a plurality of calculation instances, sub-range profile data of each calculation instance are calculated in parallel, the sub-range profile data of the multiple calculation instances are merged and superposed into range profile data of a single target, similarly, range profile data of all the targets are calculated in parallel, and the range profile data of all the targets are calculated in parallel; and after obtaining multi-target range profile data, carrying out convolution on the multi-target range profile data and a radar signal, after obtaining a convolution signal, carrying out signal delay and multi-branch amplitude-phase modulation, and outputting the amplitude-phase modulated convolution signal. According to the invention, signal echo simulation can be carried out in parallel pipeline, and high-quality large-scene echo signals are output.

The invention discloses a signal demodulation method and system of an optical fiber sensor, particularly relates to the technical field of optical fiber sensing measurement, and is used for solving the technical problem of mutual crosstalk of multi-channel measurement results caused by non-reciprocity phase modulation generated by dynamic disturbance of a public transmission optical fiber section of an existing interference type optical fiber sensor array. The method comprises the following steps: acquiring a phase modulation signal of each sensing channel, identifying a non-reciprocity phase modulation interval on a public transmission optical fiber section, analyzing the energy propagation characteristic of the interval on a sensor array space sequence to judge the type of a disturbance source, calculating a bias coefficient of frequency domain energy distribution, constructing an inter-channel crosstalk evaluation factor, and evaluating the crosstalk between the channels. And the demodulation result of the corresponding sensing channel is selectively suppressed according to the factor so as to accurately distinguish a real sensing signal from a transmission disturbance signal, so that the influence of inter-channel crosstalk on the measurement result is effectively eliminated, and the measurement precision and data reliability of the distributed optical fiber sensing system are improved.

A wireless communication device includes an antenna array with multiple antenna elements, an array of power amplifiers, and an array of phase shifters. Each antenna element is coupled to a power amplifier and a phase shifter. The device also includes transmitter circuitry coupled to the antenna array to encode a constant amplitude signal, which includes a power amplifier enable code to indicate which power amplifiers are to run in a subsequent data sample and a beam direction code to control beam direction of each phase shifter of the array of phase shifters in the subsequent data sample. The constant amplitude signal is then provided to the array of antenna elements and amplitude and phase modulation is combined over an air interface into a composite modulated signal.

The invention discloses a bus current ripple suppression method and device and a medium. The method comprises the following steps: acquiring electric quantity data of each direct current booster circuit in a current operation state in real time; based on the obtained electric quantity data, calculating a phase shift angle required by each path of direct-current booster circuit by taking the minimum total alternating-current component output to the direct-current bus by all the direct-current booster circuits as a target; and carrying out phase modulation on the driving signals of the direct current booster circuits according to the obtained phase shift angles. The device and the medium are both used for implementing the method. The bus current ripple suppression method and device have the advantages that in the bus current ripple suppression process, the phase shift angle can be made to change dynamically instead of being fixed, and therefore the problem that the bus current ripple suppression effect is poor when the input voltage and current are different is solved. And the minimum current ripple fundamental component or the current ripple effective value is directly selected as an optimization target, so that the heating value of the system can be effectively reduced.

Provided is a wireless power transmitting system and device, the wireless power transmitting device including: a signal generator configured to generate an initial signal; a controller configured to output an amplitude control signal and a phase control signal; a phase modulator configured to generate a phase-modulated signal by modulating a phase of the initial signal based on the phase control signal; a power amplifier configured to generate a power signal by amplifying the phase-modulated signal; a voltage converter configured to control a magnitude of a power voltage of the power amplifier based on the amplitude control signal; and an antenna configured to externally output the power signal.

The invention relates to the technical field of optical instruments, and provides a dimple telescope system based on a double-phase regulation and control super lens and a design method thereof, and the dimple telescope system comprises an objective lens, an eyepiece, a first super lens and a second super lens. The first super lens is arranged at the imaging plane position of the objective lens, is a local phase modulation type super lens and is used for implementing local phase modulation on an imaging area; and the second super lens is arranged at the pupil entrance plane position of the eyepiece, is a continuous phase type super lens, and is used for performing phase compensation and wavefront matching on the wavefront passing through the eyepiece. According to the invention, the double-phase collaborative design of the image plane local phase modulation superlens and the entrance pupil plane continuous phase compensation superlens is introduced into the Galileo telescope system, so that the unification of local high-resolution fovea imaging in the view field and the stability of the full-view-field image quality is realized on the premise of not changing the original optical path structure; and the aberration interference problem caused by local modulation of a single super lens is avoided.

The present application relates to the technical field of communications, and discloses a communication method, apparatus and device, and a storage medium. The communication method in embodiments of the present application comprises: a communication device acquires an index of a root sequence; the communication device determines an element value of the root sequence on the basis of the index of the root sequence; and the communication device processes a communication signal on the basis of a target sequence, so as to perform communication on the basis of the communication signal. The element value of the root sequence is a phase modulation symbol; the phase of the element value of the root sequence is determined on the basis of a polynomial comprising a highest order greater than or equal to 3, or on the basis of a function in which a first-order rate of change of phase comprises a nonlinear term; and the target sequence includes the root sequence or a base sequence generated on the basis of the root sequence.

The invention provides an integrated temperature control fiber-optic gyroscope chip, method and system. The fiber-optic gyroscope chip integrated with temperature control comprises a signal transceiving unit, a gyroscope modulation unit, an optical signal processing unit, an optical fiber coil interface unit and an on-chip temperature-sensitive micro-ring resonant cavity, and the signal transceiving unit is used for forming an optical signal according to a light source; the on-chip temperature-sensitive micro-ring resonant cavity is used for forming a first transmission spectrum according to the optical signal; the gyro modulation unit is used for generating a modulation electric field in response to the modulation driving signal so as to perform phase modulation on the optical signal; the optical signal processing unit is used for performing polarization and beam splitting on the modulated optical signal to form a first path of optical signal and a second path of optical signal; and the optical fiber coil interface unit is used for transmitting the first path of optical signal and the second path of optical signal to a polarization maintaining optical fiber coil to form a gyroscope interference optical signal and outputting the gyroscope interference optical signal, so that a gyroscope detector obtains a compensated gyroscope output result according to the gyroscope interference optical signal.

The invention relates to the technical field of energy storage type MMC control, and particularly provides a second harmonic generation circulating current suppression method of an energy storage type MMC and a related device, which can calculate a three-phase fundamental frequency current compensation value according to a three-phase energy storage output value of each bridge arm in the energy storage type MMC, and determine a three-phase second harmonic generation circulating current in the energy storage type MMC according to the three-phase fundamental frequency current compensation value. According to the method, the three-phase double-frequency circulating current is taken as a control rate for realizing double-frequency circulating current suppression, the three-phase double-frequency modulation voltage is determined, and the three-phase double-frequency modulation voltage is superposed to the three-phase modulation voltage of the energy storage type MMC. Therefore, the additional three-phase double-frequency modulation voltage can be utilized to offset a double-frequency circulating current excitation source caused by unbalanced energy storage output in the energy storage type MMC, and double-frequency circulating current suppression control of the energy storage type MMC is realized. Therefore, under the condition that the energy storage output of the upper and lower bridge arms of the energy storage type MMC is unbalanced, the second harmonic content of the bridge arm current in the converter can be quickly and effectively reduced, and the bridge arm current stress is reduced.

The invention discloses a deceptive signal injection and control method for an MEMS inertial sensor. The invention relates to the technical field of safety protection of MEMS (micro-electromechanical system) inertial sensors, and in the method, a resonant frequency interference signal subjected to amplitude modulation (AM) and phase modulation (PM) is injected into a target sensor to simulate a Coriolis force effect generated by real inertial input (such as angular velocity), so that a physically static MEMS device outputs preset erroneous motion data which seems legal, and the erroneous motion data is detected. And therefore, cheating on an upper-layer control system (such as an automatic driving attitude control unit) is realized. According to the method, by accurately controlling modulation parameters (such as modulation depth and phase offset) and a signal injection time sequence, a false inertial measurement value with high concealment and credibility can be generated, and the method is suitable for scenes such as sensor safety test, anti-interference algorithm verification and fault simulation.