31 results about "Modulation effect" patented technology

The invention discloses an electromagnetic field simulation method under the coupling action of tidal waves and sea waves. The method comprises the steps that input parameters of the tidal waves and the sea waves are set; configuring environmental parameters and geomagnetic conditions; superposing the tidal wave velocity field and the sea wave disturbance velocity field to form a total velocity field; the tidal wave part and the sea wave part are linearly coupled in time and space to obtain a tidal wave-sea wave coupling field evolved along with a tidal phase; in the tidal wave-sea wave coupling field, electromagnetic response calculation is executed on each frequency-direction sampling point; general field synthesis and modulation effect analysis: introducing a tidal wave modulation factor to clearly reflect amplitude periodic change and spectrum reconstruction characteristics of an electromagnetic field signal along with a tidal phase; and outputting a time sequence, an amplitude spectrum and a spatial distribution result of the comprehensive electromagnetic field. According to the method, the authenticity and applicability of sea wave induction electromagnetic field simulation can be improved, and a new technical means is provided for electromagnetic noise recognition, sea wave parameter inversion and complex ocean dynamics process research.

The invention relates to the technical field of bridge load tests, and provides a bridge load test crack increment change observation method and system, and the method comprises the steps: collecting prestressing tendon circumferential strain distribution data and dual-wavelength strain response data; calculating an interface bonding stiffness change parameter; pre-stress modulation effect compensation and polar coordinate system conversion are carried out on the strain response data and the rigidity change parameters, and micro-crack characteristic signals are obtained; load data and beam group arrangement parameters are collected, and a micro-crack propagation prediction model is established in combination with the interface bonding stiffness change parameters; inputting the micro-crack characteristic signal into a micro-crack propagation prediction model, and outputting a micro-crack development trend prediction result; and adjusting sampling parameters of a dual-wavelength time division multiplexing algorithm and characteristic extraction parameters of prestress modulation effect compensation according to a micro-crack development trend prediction result. According to the invention, the precision of observing the increment change of the micro-crack in the bridge load test is improved, and the automatic monitoring and prediction of the micro-crack of the prestressed concrete bridge are realized.

The invention discloses a method and system for detecting the magnetization direction of an unmagnetized magnet, and belongs to the technical field of magnetic material detection. The method comprises the following steps: applying an external guide magnetic field to a to-be-detected non-magnetized magnet; detecting a signal related to the physical state of the non-magnetized magnet under the action of the guide magnetic field as a response signal; and judging the magnetization direction of the non-magnetized magnet based on the corresponding relation between the response signal and the preset magnetization direction. The corresponding system comprises a guide magnetic field generation unit, a detection unit and a discrimination unit. The modulation effect of magnetocrystalline anisotropy of a non-magnetized magnet on an external magnetic field is utilized, invisible magnetic domain orientation information is converted into externally observable physical field difference, efficient, visual and lossless recognition of the preset magnetization direction is achieved, and the method is suitable for production quality control of magnetic assemblies such as a Halbach magnetic circuit and the like.

The embodiment of the invention discloses a background Alpha rhythm-based audio-visual perception ability evaluation method, which comprises the following steps of: acquiring an individual Alpha peak frequency of each subject, and setting various background rhythm stimuli for each subject; enabling each subject to execute various audio-visual perception tasks while the various background rhythms are stimulated, so as to collect electroencephalogram data and behavior data of each subject when the various audio-visual perception tasks are executed under the stimulation of the various background rhythms; performing feature extraction on the electroencephalogram data of each subject to obtain electroencephalogram features; performing feature extraction on the behavior data of each subject to obtain behavior features; screening electroencephalogram features related to improvement of the behavior features from the electroencephalogram features to obtain effective electroencephalogram features; and based on the effective electroencephalogram characteristics of each subject under the individual Alpha rhythm stimulation and the effective electroencephalogram characteristics of each subject under each contrast rhythm stimulation, calculating the modulation index of each subject so as to quantitatively evaluate the adjustment effect of the individual Alpha rhythm stimulation on the audiovisual perception ability of each subject.

The utility model discloses an SIP radio frequency surface-mounted BPSK modulator, which relates to the technical field of semiconductor radio frequency devices, and comprises a substrate and a phase-locked loop circuit arranged on the substrate, the phase-locked loop circuit is connected with a power divider and a differential buffer output unit, the power divider and the differential buffer output unit are connected with a modulation multiplier, and the modulation multiplier is connected with an SIP radio frequency surface-mounted BPSK modulator. The modulation multiplier is connected with a baseband processing unit and a first filter, the baseband processing unit is connected with a first signal input end, the first filter is connected with a switch modulation unit, the switch modulation unit is connected with a second signal input end and a second filter, and the second filter is connected with a signal output end. The device provided by the utility model has the advantages of small size, integration, multiple functions and good modulation effect.

The invention relates to the technical field of digital pre-distortion, in particular to an adjacent multiband digital pre-distortion system and method, and the method comprises the steps: S1, extracting an intermodulation feature vector of an adjacent multiband input signal, and constructing a nonlinear coupling feature matrix based on the intermodulation feature vector; and S2, generating a frequency band cooperative compensation signal by using the nonlinear coupling characteristic matrix, wherein the frequency band cooperative compensation signal is used for compensating an asymmetric cross modulation effect between adjacent frequency bands. And S3, constructing a dynamic pre-distortion parameter optimization model based on the distortion characteristic analysis result of the frequency band cooperative compensation signal and the power amplifier output signal, and generating a final pre-distortion output signal through real-time feedback adjustment. According to the method, the nonlinear primary function set including the high-order intermodulation item and the inter-band cross modulation component is constructed, and the nonlinear coupling feature matrix extracted by singular value decomposition is combined, so that inter-band collaborative modeling and compensation signal generation are realized, and the adaptive capacity under the complex working condition is enhanced.

The application provides a large-span tower lightning activity modulation detection method and system, relates to the field of lightning monitoring and protection, and solves the technical problem that it is difficult to accurately identify the modulation effect of towers on lightning activity under a detection method with small data volume and without relying on distribution assumptions; the method comprises the following steps: performing data processing on lightning event data to obtain sample set one and sample set two, calculating the distribution difference and the significance threshold of sample set one and sample set two in a three-dimensional space, and judging whether the tower construction has a modulation effect on lightning activity based on the distribution difference and the significance threshold; if yes, calculating the annual lightning density change rate and the lightning current amplitude median drift amount before and after the tower is put into operation in each concentric ring-shaped region, and performing smooth fitting to obtain a fitting curve; determining the modulation region and the corresponding spatial position parameters based on the fitting curve; and the application can improve the accuracy of identifying the modulation effect of large-span towers on lightning activity.

The application provides a large-span tower lightning activity modulation detection method and system, relates to the field of lightning monitoring and protection, and solves the technical problem that it is difficult to accurately identify the modulation effect of towers on lightning activity under a detection method with small data volume and without relying on distribution assumptions; the method comprises the following steps: performing data processing on lightning event data to obtain sample set one and sample set two, calculating the distribution difference and the significance threshold of sample set one and sample set two in a three-dimensional space, and judging whether the tower construction has a modulation effect on lightning activity based on the distribution difference and the significance threshold; if yes, calculating the annual lightning density change rate and the lightning current amplitude median drift amount before and after the tower is put into operation in each concentric ring-shaped region, and performing smooth fitting to obtain a fitting curve; determining the modulation region and the corresponding spatial position parameters based on the fitting curve; and the application can improve the accuracy of identifying the modulation effect of large-span towers on lightning activity.

The invention relates to the technical field of motor health state diagnosis, and particularly discloses a motor health state diagnosis system based on multi-sensor fusion, which comprises a multi-source sensing acquisition module, a high-precision time synchronization module, a dynamic feature extraction module, a self-adaptive fusion decision module and a health state output module, according to the invention, a high-precision time synchronization module is constructed, and a strategy of combining hardware timestamp injection with phase offset estimation based on cross-correlation and rotation modulation compensation is adopted, so that time alignment of three kinds of heterogeneous signals of vibration, current and temperature at a sub-microsecond level is realized; the problem of feature space distortion caused by sensor sampling frequency difference and a mechanical rotation modulation effect under a high-speed working condition is fundamentally solved, and the space-time consistency of original data is remarkably improved.

The invention relates to the technical field of power system monitoring and load management, and particularly discloses a non-intrusive target load identification method based on cloud-end scene migration, which introduces a physical consistency data enhancement mechanism at a cloud end, and simulates a modulation effect of voltage sag on a background load by calculating a dynamic coupling modulation factor. And a high-fidelity enhanced triple data set is generated, so that the problem that the coupling characteristic of a circuit is neglected in traditional data enhancement is solved. On this basis, a brand invariance feature extractor is trained by using hierarchical metric learning, and class essential features are learned by optimizing an inter-class and inter-brand distance forced model. Finally, the feature extractor and the classification head are assembled into a generalization model to be deployed to the end side, reasoning is carried out by freezing parameters of the feature extractor, the cross-brand generalization problem caused by physical heterogeneity of the electric appliance is effectively solved, and accurate identification of the electric appliance with no brand at the end side is achieved.

The invention relates to an M3C low-frequency port modeling method, device, equipment and medium based on multi-frequency coupling, and the method comprises the steps: carrying out the non-single frequency multiplication sequence decomposition of voltage, current and modulation signals in an M3C bridge arm loop under a static coordinate system, extracting the steady-state component of each frequency component, and constructing an M3C steady-state frequency domain model; based on the model, analyzing frequency coupling characteristics of the power frequency component, the low frequency component and the circulating current component in the bridge arm current, and establishing a frequency-crossing conversion relation between the bridge arm current and the power frequency current, and between the bridge arm current and the low frequency current and the circulating current; based on the cross-frequency conversion relation, performing frequency domain modeling on the low-frequency side control signal, and establishing a low-frequency modulation small signal model; the modulation effect of a control loop is introduced, a bridge arm modulation small signal comprehensive model is established, equivalent coupling factors of power frequency power grid impedance and a low-frequency transformer are considered, and an admittance model of an M3C low-frequency port is deduced. The method has the effect of improving the judgment accuracy of the dynamic relation between the bridge arm current and the port voltage under the low-frequency and frequency doubling coupling condition.

The application relates to the technical field of integrated circuits, and discloses a hysteresis comparator circuit based on double-gate field effect tubes and an integrated chip, wherein the hysteresis comparator circuit comprises at least two cascaded inverters, each inverter comprising at least one input tube and one load tube, wherein the drain of the input tube and the source of the load tube are connected, and a connection node is configured as an output end of the inverter, and at least one of the input tube and the load tube of each inverter is a double-gate field effect tube; a feedback conductive wire is connected between the second gate of the double-gate field effect tube in the first-stage inverter and the output end of the other inverters, so that the signals on the first gate and the second gate of the double-gate field effect tube change in the same phase, to constitute positive feedback for realizing hysteresis effect. The application utilizes the common modulation effect of the two gates of the double-gate field effect tube to constitute the hysteresis effect, reduces the difficulty of on-chip integration of the hysteresis comparator, and improves the flexibility of the hysteresis comparator.

This invention discloses a laser device, a lidar, and a laser detection method. The laser device includes: a laser chip for generating a laser beam signal based on a driving signal; a beam signal transmission device disposed on the beam signal transmission path for splitting the laser beam signal generated by the laser chip into a probe beam and a feedback beam, wherein the probe beam is used for target detection; a feedback link for receiving the feedback beam and determining a corresponding feedback electrical signal based on the feedback beam; and a control module for receiving the feedback electrical signal, determining characteristic parameters of the laser beam signal based on the feedback electrical signal, and adjusting the driving signal based on the characteristic parameters, wherein the characteristic parameters include at least one of the following: signal amplitude, frequency modulation bandwidth, and frequency modulation linearity. This invention solves the technical problem of poor modulation effect of laser signals in related technologies.

The invention provides a self-bias instrument input stage circuit based on a bipolar process, and belongs to the technical field of instrument input circuits, the input end of a bias current compensation circuit is connected with the output end of a mirror image constant current source circuit, and the output end of the bias current compensation circuit is connected with the input stage circuit; the input end of the input stage amplification circuit is connected with an external signal input end and the output end of the bias current compensation circuit, and the input end of the input stage amplification circuit is also connected with a P tube proportional current source and an N tube proportional current source output by the mirror current source circuit. Wherein the current flowing through the acquisition tube N2 and the current flowing through the target tube N1 are both determined by a P-type current source through the improved design, and the VCE voltage of the P2 tube and the VCE voltage of the P10 tube are controlled to be basically consistent, so that the influence caused by the width modulation effect of a base region is reduced, the compensation precision is greatly ensured, the bias current required by the input stage from the outside is reduced, and the temperature drift of the bias current is reduced.

The invention discloses a chopping amplification circuit and electronic equipment, and belongs to the technical field of electronic circuits. The chopping amplification circuit comprises a transformer switch amplification module, a differential amplification filtering module and a demodulation module, firstly, an input signal is subjected to first-stage amplification through the transformer switch amplification module, and meanwhile, the input signal is modulated to a high-frequency band far away from low-frequency noise; then, the signal enters a differential amplification filtering module, second-stage amplification is carried out, low-frequency noise is removed, and an inherent high-frequency noise signal subjected to differential amplification and a useful high-frequency signal are output together; and finally, based on the modulation effect of the first-stage amplification, the demodulation module demodulates the useful high-frequency signal and the inherent high-frequency noise signal back to a low-frequency band corresponding to the input signal, and the demodulated signal is fed back and superposed on the input signal to form a closed-loop feedback circuit. Therefore, noise interference caused by differential amplification is reduced, low-frequency noise at the input end of the chopping amplification circuit is reduced, and the measurement precision of the chopping amplification circuit is improved.

This invention relates to the field of optical communication device testing technology, and discloses a testing system and method for the optical performance of a wavelength division multiplexer (WDM), including an optical signal injection monitoring module, a physical field loading isolation module, and a receiving demodulation processing module. The physical field loading isolation module arranges a main test channel, a trans-cabin reference channel, and an equivalent dummy sample channel in parallel, synchronously acquiring optical flow parameters and background transmission variation data to offset common-mode components of external link loss. The measurement signal is decoupled using orthogonal frequency division jitter and a dual-matrix regularization de-embedding model to suppress crosstalk in the spectral response between channels; complex phasor compensation is used to offset the parasitic modulation effect of the light source, extracting the device's true net loss and complex transmission slope; the distance measure between the optical feature vector and the template domain is calculated, and an exponential contraction factor is introduced by combining the environmental state vector to generate a dynamic safe operating envelope model. This invention achieves the separation of environmental disturbances and intrinsic device degradation, establishing a real-time failure assessment boundary.

The application provides a spread spectrum circuit, a power supply system, a chip and an electronic device. The closed loop controlled oscillator comprises a closed loop control module and a voltage controlled oscillator for generating a first clock signal; the spread spectrum circuit comprises a spread spectrum module and a frequency divider for generating a second clock signal with a preset frequency according to the first clock signal; the input end of the spread spectrum module is coupled to the output end of the frequency divider, the output end of the spread spectrum module is coupled to the first input end of the closed loop control module, the output end of the closed loop control module is coupled to the input end of the voltage controlled oscillator, the output end of the voltage controlled oscillator is coupled to the second input end of the closed loop control module and the input end of the frequency divider; the spread spectrum module generates a triangular wave signal according to the second clock signal, and the closed loop control module generates a control signal for driving the oscillator according to the first clock signal and the triangular wave signal. The application can achieve linear frequency modulation effect without complex digital modules, the spectrum energy is uniform, the chip design can be effectively simplified, and the cost can be significantly reduced.

The present application relates to a kind of wind farm primary frequency modulation parameter frequency control method, device and equipment, the method includes the simulation model of island power grid system black start is built;After simulation model runs, according to n*5% island power grid system load is respectively input simulation model, obtain the n primary frequency modulation parameters that meet constraint condition;N primary frequency modulation parameters are all input into the primary frequency modulation control device of island power grid system, and real-time acquisition load parameter in the black start process of island power grid system;According to the load parameter of real-time acquisition, select corresponding primary frequency modulation parameter to control the operation of island power grid system.The method improves the primary frequency modulation modulation effect of island power grid system wind farm, realizes to adapt to the case that island power grid system is in black start period, enhances the reliability and stability of island power grid system operation with the continuous change of load.

The invention discloses a permanent magnet motor fault analysis method based on an air-gap magnetic field modulation theory, and the method comprises the steps: constructing fault modulation operators including eccentricity, turn-to-turn short circuit and local demagnetization according to the modulation effect of a typical fault of a permanent magnet motor on an air-gap magnetic field; based on the fault modulation operator, analyzing and calculating electromagnetic performance parameters of the permanent magnet motor in the fault state; according to the modulation effect of the fault modulation operator on the permanent magnetic field and the armature magnetic field, the torque ripple in the fault state is analyzed and obtained; and finally, based on the analysis results of the electromagnetic performance parameters and the torque pulsation, diagnosis and distinguishing of typical faults of the permanent magnet motor are realized. According to the method, the air-gap magnetic field modulation theory and motor fault analysis are combined, the uniformity analysis of the electromagnetic performance and the torque characteristic of the motor under various typical faults is realized from the magnetic field modulation mechanism, the fault essence can be effectively revealed, and a reliable basis is provided for fault diagnosis and accurate distinguishing of the permanent magnet motor under complex working conditions.

The application relates to the technical field of micro-nano photonics, and discloses a generation structure and method of a large-scale dense array of bound states in continuum, which comprises a one-dimensional photonic crystal stacked by a plurality of period units, each period unit comprising first and second dielectric layers arranged alternately; and at least two gratings arranged at the top and bottom of the one-dimensional photonic crystal respectively, the gratings having the same period and jointly forming a composite structure with the one-dimensional photonic crystal, the composite structure being symmetrical up and down. The application combines the one-dimensional photonic crystal with a pair of symmetrical gratings up and down, utilizes the orthogonal modulation effect of the two on light waves and the structural symmetry, and realizes a large-scale and high-density array distribution of a degenerate "bound state in continuum-resonance" double-mode group in a frequency space, wherein the number of the double-mode group is equal to the number of periods of the one-dimensional photonic crystal, thereby providing a brand-new technical path for high-capacity integrated photonic devices.

The invention discloses a high-voltage wide-pulse modulation ms-level coordination control method and system based on a microwave power supply system, and belongs to the technical field of power electronics, and the method comprises the steps: 1, obtaining the instantaneous amplitude fluctuation of a high-voltage pulse, and generating an amplitude deviation sequence; 2, calculating a local slope change rate according to the amplitude deviation sequence, and generating a phase lag trend; 3, constructing a compensation operator based on a phase lag trend, and predicting an amplitude decay time point sequence; step 4, converting the amplitude decay time point sequence into a pulse width modulation signal and performing signal injection; 5, adjusting the parameter weight of the compensation operator according to the actual modulation effect of signal injection, and correcting the prediction deviation by using an error integration mechanism; the industrial pain points that high-voltage pulse leading edge overshoot is difficult to capture and amplitude fluctuation is difficult to quantify can be effectively solved, the original data precision of the pulse signal is greatly improved, and the instantaneous fluctuation of the pulse amplitude is controlled within an extremely small range.

The application discloses a high-voltage wide pulse modulation ms-level coordination control method and system based on a microwave power supply system, and belongs to the technical field of power electronics, and comprises the following steps: step 1, obtaining the instantaneous amplitude fluctuation of a high-voltage pulse to generate an amplitude deviation sequence; step 2, calculating a local slope change rate according to the amplitude deviation sequence to generate a phase lag trend; step 3, constructing a compensation operator based on the phase lag trend to predict an amplitude attenuation time point sequence; step 4, converting the amplitude attenuation time point sequence into a pulse width modulation signal and performing signal injection; and step 5, adjusting the parameter weight of the compensation operator according to the actual modulation effect of the signal injection and correcting the prediction deviation by using an error integration mechanism. The application can effectively solve the industry pain points of difficult capture of high-voltage pulse front overshoot and difficult quantification of amplitude fluctuation, greatly improves the original data precision of the pulse signal, and controls the instantaneous fluctuation of the pulse amplitude in a very small range.

The present application relates to a neuromodulation device for treating hippocampus-related brain diseases. The neuromodulation device comprises a phototherapy part and a transcranial alternating current stimulation (tACS) part. The phototherapy part irradiates near-infrared light toward at least a frontal lobe or a temporal lobe, such that the near-infrared light acts on at least a part of the hippocampus. The tACS part applies tACS of a second frequency, and an electric field action range covers at least a part of the hippocampus. When the near-infrared light is continuous light, the second frequency is in one of five representative frequency bands of brain waves. When the near-infrared light is pulsed light having a first frequency, the first frequency and the second frequency also satisfy a preset frequency relationship. The preset frequency relationship comprises: a deviation being less than a threshold, or having a preset frequency band coupling relationship. Transcranial electrical stimulation can produce analgesic and relaxing effects, which can reduce the discomfort of a subject during treatment. Therefore, the treatment time can be prolonged and / or the power density of near-infrared light can be increased as needed, so as to improve the therapeutic effect. The photoelectric bimodal stimulation can improve modulation effects on endogenous oscillations of the brain.

The utility model provides a double-modulation non-contact integrated double-electromechanical-port motor with high harmonic utilization rate and high power density. The double-modulation non-contact integrated double-electromechanical-port motor comprises a stator, an excitation rotor and a modulation rotor which are coaxially and sequentially nested from outside to inside, the stator is of a split tooth type structure, stator auxiliary teeth are split from stator main teeth, and the stator auxiliary teeth are evenly distributed in the circumferential direction and are of an open slot structure. Two sets of armature windings with different numbers of pole pairs are placed in the stator, one set is a higher harmonic modulation winding wound on a stator main tooth, the other set is a base harmonic modulation winding wound on a stator auxiliary tooth, and the higher harmonic modulation winding and the base harmonic modulation winding serve as two electric ports of the motor. The stator, the base harmonic modulation winding and the excitation rotor form a vernier motor, and the stator, the higher harmonic modulation winding, the excitation rotor and the modulation rotor form a higher harmonic magnetic flux modulation reluctance motor. According to the utility model, the problems of low harmonic utilization rate, poor modulation effect and low torque density / power density in the prior art can be solved.

The invention provides a semiconductor device radio frequency modeling method and model for a silicon-on-insulator (SOI) platform. The method comprises the following steps: constructing an equivalent circuit model comprising a gate / body end parasitic impedance network, an intrinsic capacitance module, a body resistance module and a substrate network module; an intrinsic capacitance parameter is extracted through a low-frequency CV test, Cg is decomposed into overlapping capacitance, depletion capacitance and accumulation capacitance, and a hyperbolic tangent function and polynomial correction are introduced; extracting parasitic resistance inductance by using layout information and square resistance; bulk resistance parameters modulated by voltage are extracted based on the high-frequency S parameters, and the body resistance is fitted by adopting an exponential function. The model provided by the invention can accurately reflect the back gate effect and the bulk resistance modulation effect of the SOI device, and shows excellent fitting precision in a wide frequency band, wide voltage and wide temperature range.

This invention discloses a personalized binaural beat music generation method based on quantitative analysis of EEG frequency bands. This method automatically parses eight mainstream EEG data formats and standardizes the data through adaptive preprocessing. It uses the Welch periodogram method to calculate the power spectrum of five frequency bands, extracts key clinical indicators, and outputs a quantitative state score. Based on the EEG state, it intelligently recommends or allows manual selection of target beat frequencies, embedding the binaural beats into user-selected background audio using AM double-sideband modulation technology. A quantitative verification step for the modulation effect is introduced to ensure the effectiveness of neural feedback. This invention achieves full-process integration of EEG analysis, personalized recommendation, audio synthesis, and playback control, providing a scientific, convenient, and quantifiable technical solution for mood regulation, concentration improvement, and sleep enhancement.

The application belongs to the technical field of electrical equipment state monitoring, and specifically discloses a method and system for predicting the deterioration trend of a lightning arrester in extremely cold conditions based on multi-physical field coupling, which comprises the following steps: synchronously collecting multi-dimensional data such as bus voltage, end total current, surface temperature field and broadband mechanical vibration of the lightning arrester; based on the internal instantaneous Joule heat power, the electric parameter is deconstructed, and cross-correlation analysis is performed with the surface temperature field to calculate the effective heat conduction time delay representing the structural integrity; the newly added mechanical resonance frequency is extracted from the vibration signal, and the total current is modulated based sideband lock detection to identify the electromechanical coupling damage features causing the current modulation effect. The application combines the evolution trend of the heat conduction time delay and the detection results of the electromechanical coupling damage to generate a prediction report containing the structural thermal resistance state and the crack electrical risk level, which can distinguish the defect nature and evaluate the electrical risk, and is helpful for grading early warning.

The invention provides an error correction method and system for propagation of electromagnetic waves in an ionosphere, and relates to the technical field of electronics, and the method comprises the steps: inputting historical observation data of the ionosphere according to a layout address of a digital array, and extracting a time sequence change rule of the data to construct an empirical model of the ionosphere; collecting real-time detection data of the ionosphere, and correcting the ionosphere empirical model by using the real-time detection data to obtain an initial electromagnetic signal correction model; and collecting and sorting multi-frequency-point signals received by the digital array, carrying out statistical analysis on the multi-frequency-point signals to reduce white noise interference, inputting obtained signal characteristic data into the initial electromagnetic signal correction model, and optimizing model parameters to obtain a target electromagnetic signal correction model so as to realize compensation correction of electromagnetic wave ionosphere propagation errors. According to the invention, the modulation effect of the ionosphere on electromagnetic waves of different propagation paths can be accurately quantified, cooperative compensation of various errors is realized, the influence of noise interference is small, and the method is not limited by regions.

This invention discloses an anti-interference low-sidelobe waveform modulation system and method based on simplified hardware implementation, belonging to the technical field of waveform modulation methods. It includes: a modulation control voltage curve acquisition module, a target waveform output module, and a waveform modulation adaptive execution module. This invention simplifies the waveform modulation circuit design, reducing hardware complexity and cost while achieving dynamic envelope modulation of radio frequency signals. It balances anti-interference and low-sidelobe requirements, introduces an environmental adaptive mechanism to accurately adapt to different environmental interferences, and avoids modulation performance degradation caused by environmental fluctuations. By calculating the anti-interference low-sidelobe modulation effect score, it dynamically selects a targeted execution path, resolving the physical conflict between spectrum broadening and low-sidelobe requirements. This satisfies the need for high anti-interference capability while reducing spectral energy leakage through low-sidelobe characteristics, improving the stability and reliability of signal transmission. It achieves a highly efficient balance between modulation performance and engineering practicality under limited hardware conditions.

The embodiment of the application discloses an arrayed deformation liquid crystal elastomer terahertz modulation super surface and a preparation method thereof. The super surface comprises a liquid crystal elastomer substrate and a super surface structure on one side of the substrate, the super surface structure comprises a plurality of open resonant rings; a plurality of terahertz modulation units, the terahertz modulation unit comprises at least one open resonant ring; and a hollow area arranged on the liquid crystal elastomer substrate and extending in a line shape, the line connecting the two ends of the hollow area extends along a first direction, and the liquid crystal elastomer substrate in the terahertz modulation unit is connected with the whole liquid crystal elastomer substrate at the position of the line. The technical scheme of the embodiment of the application uses the terahertz modulator composed of the liquid crystal elastomer substrate and the super surface structure on the substrate, locally excites the deformation of the substrate by applying the structure light to the liquid crystal elastomer, directly regulates and controls each unit structure of the terahertz super surface, and thus the modulation effect on the transmission / reflection terahertz spectrum is realized.