344 results about "Field strength" patented technology

The invention relates to the technical field of connector detection, and discloses a reliability detection method based on a connector. The method comprises the following steps: acquiring real-time monitoring data of a multi-channel electrical sensor of a connector in a power-on state, wherein the real-time monitoring data covers a contact impedance fluctuation sequence, temperature rise gradient distribution and an electromagnetic leakage intensity spectrum; performing time-frequency domain fusion processing on the monitoring data, and extracting dynamic characteristic parameter sets such as impedance attenuation rate, heat conduction lag coefficient and field intensity distortion factor of each contact point; then, according to the parameter space distribution difference, a three-dimensional degradation model comprising a material performance attenuation layer, a contact surface deformation topology layer and an insulating medium loss layer is constructed; coupling mechanical stress and electric heating field intensity distribution based on the model, and generating life prediction indexes of each region; and finally, completing reliability grading according to the indexes, and outputting a detection report with key failure position marks. According to the method, comprehensive and accurate evaluation of the reliability of the connector is realized, and an effective technical path is provided for quality control of the connector.

The invention provides a keyless entry system calibration method and apparatus, an electronic device and a medium. The method comprises the steps of determining a first region and a second region according to a to-be-calibrated function of a target antenna, a first field intensity threshold and a second field intensity threshold; the first field intensity threshold value is greater than the second field intensity threshold value; the second area comprises the first area; based on the position of the key in the expansion area, determining a first field intensity measurement value and a second field intensity measurement value corresponding to the position; the first field intensity measurement value is the field intensity measurement value of the key relative to the target antenna, and the second field intensity measurement value is the field intensity measurement value of the key relative to at least one other antenna on the vehicle; the expansion area is an area which is in the second area and is not in the first area; determining a judgment rule set according to the to-be-calibrated function; and determining a target field intensity threshold value corresponding to the to-be-calibrated function according to the judgment rule set, the first field intensity measurement value and the second field intensity measurement value.

The invention relates to a basin-type insulator noise reproduction method and system, computer equipment, a computer readable storage medium and a computer program product. The method is applied to a basin-type insulator noise reproduction system. The basin-type insulator noise reproduction system comprises a basin-type insulator, an M-element antenna array and a data acquisition system. The method comprises the following steps: acquiring target noise data of the basin-type insulator based on a data acquisition system; obtaining an expected radiation waveform and expected field intensity distribution of the M-element antenna array based on the basin-type insulator target noise; according to the expected radiation waveform and the expected field intensity distribution of the M-element antenna array, calling a phase regulation and control model to generate an excitation signal; and adopting the excitation signal to drive the M-element antenna array, and synthesizing a basin-type insulator to reproduce noise. By adopting the method, the noise reproduction of the basin-type insulator can be realized.

The invention discloses a signal enhancement method and device in an industrial plant area, and relates to the field of wireless communication, and the method comprises the steps: firstly, obtaining complete channel state information, and guaranteeing that all decisions are based on real channel characteristics instead of theoretical assumptions; and secondly, if the complete channel state information does not meet the target QoS demand quantization parameter, maximizing a receiving signal to interference plus noise ratio and meeting the target QoS demand are taken as optimization targets, an optimization result is obtained based on channel field intensity distribution information of a preset digital twin model, and finally, the optimization result is controlled and executed to form closed-loop feedback. According to the method, optimization is carried out based on channel field intensity distribution information of a unit space in a digital twin model, and a complex problem needing to be solved by a high-dimensional iterative solution algorithm in related technologies is converted into table lookup and interpolation operation based on space coordinates, so that the calculation complexity is remarkably reduced, the time for obtaining an optimization result is greatly shortened, and the calculation efficiency is improved. Therefore, the time when the terminal is in a poor-quality signal state is greatly reduced.

A sensor element is for testing a planar data carrier with a spin resonance feature. The sensor element includes a magnetic core having an air gap into which the planar data carrier can be inserted for testing purposes, a polarization device for generating a static magnetic flux in the air gap, and a resonator device for exciting the spin resonance feature of the data carrier to be tested in the air gap. The resonator device has at least two stripline resonators positioned at different positions in the air gap. The polarization device generates an in-homogeneous magnetic flux in the air gap so that the static magnetic flux has a first field strength at the position of a first stripline resonator and a second, different field strength at the position of a second stripline resonator.

The invention provides a regional electromagnetic intelligent evaluation method and system based on spectral entropy weighting, and the method comprises the following steps: collecting electromagnetic spectrum data and the motion state of a patrol vehicle, and constructing a virtual aperture data matrix through the motion information; space covariance analysis and subspace projection are carried out on the matrix, multipath scattering interference is separated and eliminated, and a pure field intensity sequence is obtained through reconstruction. By calculating the normalized spectrum entropy of the Doppler power spectrum of the pure field intensity sequence, an inverse proportion weight coefficient representing the signal confidence is generated; and weighting the weight to a pure field intensity sequence, and mapping the pure field intensity sequence to a geographic space. And dynamically adjusting the density of the evaluation grid according to the field intensity gradient, and finally carrying out weighted centroid calculation based on inverse proportion weight to obtain a regional electromagnetic environment evaluation result. According to the method, the technical problem that a regional evaluation result is not accurate due to the fact that multipath components cannot be separated and single-point data quality cannot be evaluated in traditional mobile patrol is solved.

The invention discloses a multi-channel frequency modulation signal real-time monitoring system which comprises at least one monitoring node and a remote cloud platform. The monitoring nodes simultaneously receive multiple paths of frequency modulation signals through the multi-channel radio frequency receiving unit, the signal processing unit demodulates and detects multiple quality parameters such as field intensity, signal-to-noise ratio, frequency offset and multipath interference, the main control unit generates alarm information, and finally the alarm information is uploaded to the cloud platform through the communication unit integrated with 4G / 5G and Wi-Fi. And the cloud platform is responsible for storing and analyzing data and pushing alarms and information display to the authorized user terminal. According to the invention, a multi-core DSP parallel processing architecture, dual-path power supply and battery redundancy power supply and multi-parameter association intelligent alarm logic are adopted, cloud networking management is realized, and the problems of few monitoring channels, low efficiency, insufficient intelligent degree and difficult remote operation and maintenance in the prior art are solved. Therefore, efficient, reliable and intelligent remote monitoring of multi-channel FM signals is realized.

The absorber is formed by periodically arranging a plurality of absorption structure units, each absorption structure unit comprises a SiO2 substrate, a Ti metal layer and two Si3N4 regular hexagonal prisms which are coaxially arranged from bottom to top, and the embedded body which is coaxially arranged in the Si3N4 regular hexagonal prism at the bottom layer; the embedded body comprises an MgF2 regular hexagonal prism on the outer layer, a Cr metal circular ring on the middle layer and a TiO2 regular hexagonal prism on the inner layer. When the MgF2 regular hexagonal prism is internally tangent to the Si3N4 regular hexagonal prism at the bottom layer, the Cr metal circular ring is internally tangent to the MgF2 regular hexagonal prism, the TiO2 regular hexagonal prism is internally tangent to the Cr metal circular ring, and the top point of the bottom surface of the Si3N4 regular hexagonal prism at the top layer coincides with the midpoint of the edge of the top surface of the Si3N4 regular hexagonal prism at the bottom layer, it is ensured that an electromagnetic field / sound field is uniformly coupled between structural units, energy leakage or too high local field intensity is avoided, and the electromagnetic field / sound field is effectively improved. The coverage range of absorbed waves is 800-2800nm, and is not influenced by incident energy polarization, so that the application range is wide; structural unit layout facilitates accurate alignment, manufacturing difficulty and cost are reduced, and mass production, popularization and application are easy.

The invention relates to the technical field of power system communication, in particular to a transformer substation wireless network coverage area optimization method based on artificial intelligence, which comprises a data acquisition module, a feature fusion and extraction module, an intelligent decision model module, a closed loop optimization execution module and a dynamic adaptive module, and all the modules work cooperatively through external communication interfaces. According to the application, signal quality is directly reflected through wireless signal sensing data (RSSI / SNR / channel occupancy rate), spatial topological data (three-dimensional point cloud model) accurately locates the position relationship between the AP and the equipment, electromagnetic interference data (spectrum characteristic / field intensity distribution) quantifies the attenuation influence of the high-voltage equipment on the signal, and service demand data (time delay sensitivity level) distinguishes the priority of key services, so that the service quality of the high-voltage equipment is improved. Meteorological data (temperature and humidity) is used for correcting propagation loss in rainy and foggy weather, and coverage bottlenecks (such as interference main lobe direction and signal shielding in equipment dense areas) can be more comprehensively identified through multi-source data fusion.

The invention relates to the technical field of magnetic material detection, in particular to a magnetizing body performance detection method and system and a medium, and the method comprises the steps: constructing a directional coupling magnetic circuit, enabling a magnetic sensor to synchronously sweep along the length direction of a magnetizing chain, applying external excitation, collecting signals in real time, and detecting the performance of a magnetizing body through the convergence effect of the directional coupling magnetic circuit on leakage magnetic flux. In the scanning process, a leakage magnetic flux space distribution spectrum on the surface of a magnetizing chain is collected, signal feature analysis is conducted on the leakage magnetic flux space distribution spectrum, a local field intensity distortion area is recognized, a defect fingerprint feature vector is generated, the defect fingerprint feature vector is compared with a preset eligibility criterion threshold value, and the eligibility of the magnetizing chain is judged. Therefore, the performance of each magnet in the magnetizing chain is judged and analyzed, the detection sensitivity of early defects and recessive magnet performance degradation is effectively improved, and the signal-to-noise ratio of an unqualified magnet identification signal is improved.

The invention provides a frequency converter electromagnetic interference spectrum real-time monitoring and tracing method and device, and relates to the technical field of frequency converters, and the method comprises the steps: building a mapping relation between frequency converter operation state parameters and magnetic leakage point electromagnetic interference data; taking the operation state parameters of the frequency converter as excitation sources to be injected into an electromagnetic simulation space, and generating predicted interference spectrum and electromagnetic field distribution information in real time; according to the mapping relation, matching and comparing the predicted interference spectrum and electromagnetic field distribution information with the electromagnetic interference data, and comparing with a preset interference fingerprint database; and positioning field intensity space coordinates by combining the space magnetic field distribution of the electromagnetic interference data according to the interference spectrum characteristics, and generating an interference spectrum traceability result based on the interference spectrum characteristics, the field intensity space coordinates and predicted interference spectrum and electromagnetic field distribution information. According to the invention, the technical problem of low electromagnetic interference identification precision of the frequency converter in the prior art can be solved, and the technical effect of improving the electromagnetic interference identification precision is achieved.

The invention relates to the technical field of wireless positioning, and discloses a wireless personnel positioning method and system through a positioning tag card. The method comprises the following steps: acquiring an original measurement value of a multi-band signal in a positioning tag card, and extracting an interfered band combination based on the original measurement value; carrying out fluctuation modeling on the frequency band combination by adopting field intensity detection, generating a fluctuation feature vector, carrying out weather type classification based on the fluctuation feature vector, and determining a rainy day attenuation calculation mode; adjusting the signal intensity according to a rainy day attenuation calculation mode, obtaining adjusted signal intensity data, calculating a distance estimation value, and generating a distance parameter set; and performing triangulation positioning according to the distance parameter set, generating a real-time position coordinate, matching the real-time position coordinate with historical trajectory data, adjusting a compensation coefficient of the compensation model, and generating an optimized positioning result by using the adjusted compensation model. According to the invention, the continuity and accuracy of wireless positioning are improved.

The invention relates to the technical field of antenna testing, in particular to a large-field-intensity testing system and method based on a high-gain antenna. The test system comprises a radiation source generation device and a test assembly, and the radiation source generation device comprises a signal source used for generating an electric signal of a specific frequency; the power amplifier is used for amplifying the electric signal to a required level; the high-gain radiation antenna is used for converting the amplified electric signals into electromagnetic waves, controlling the energy of the electromagnetic waves to be focused in a specific direction and improving the electric field intensity in the specific direction; the test assembly comprises a receiving antenna which is used for capturing electromagnetic waves radiated by a high-gain radiation antenna at a preset position and converting the electromagnetic waves into electric signals to be tested; and the analysis device is used for analyzing the to-be-measured electric signal to measure the electric field intensity of the preset position. By adopting the scheme provided by the invention, the test cost can be effectively reduced and the operability and applicability of the test can be improved on the premise of ensuring the test precision.

The invention relates to the technical field of wireless communication, and discloses an adaptive LDPC code coding method, system and device based on evaporation waveguide field intensity distribution, and a medium, and the method comprises the steps: obtaining the evaporation waveguide field intensity distribution in real time, and generating a field intensity distribution diagram; calculating a channel state parameter, and dynamically selecting a low-density parity check code rate according to the channel state parameter information; dynamic low-density parity check coding is adopted, and a sparse structure is adjusted through a check matrix, so that real-time switching of multi-code-rate low-density parity check codes is carried out; and a receiving end carries out decoding by adopting an NW-RBP decoding algorithm, defines a node updating rule, and dynamically schedules a node updating sequence through a residual error. According to the method, the bit error rate under a complex channel is reduced, and meanwhile, the reliable transmission efficiency of system data is improved.

The invention relates to the technical field of field intensity prediction, in particular to a medium-wave broadcast-based field intensity prediction method and system, and the method comprises the following steps: obtaining the environment space information of an emission source for medium-wave broadcast, and constructing an environment model of the emission source based on the environment space information; rasterizing the target area of the emission source based on the prediction model to form a plurality of grid receiving points; predictive control information is configured for the emission source based on the predictive model, and the predictive control information comprises a vernier and a selection frame chain corresponding to the vernier; driving the verniers to sequentially move in the target area along the propagation direction; the field intensity value of the vernier at each position is predicted based on the selection frame chain of the vernier, the grid points meeting the preset field intensity condition are connected to form the field intensity range contour, the field intensity range and the field intensity values of the grid points in the field intensity range are output to serve as the final prediction result, and the accuracy of field intensity prediction can be effectively improved.

The application discloses a near electric field alarm safety helmet and an alarm method for omnidirectional field intensity vector monitoring, and relates to the field of electric power safety protection. The safety helmet comprises an omnidirectional field intensity sensing array, a vector field signal processing module and an alarm module which are assembled on a safety helmet body. The omnidirectional field intensity sensing array comprises at least five electric field sensors which are arranged on the top of the safety helmet body and around the brim of the safety helmet body. The vector field signal processing module is used for acquiring electric field intensity components collected by the electric field sensors, and performing vector synthesis on the electric field intensity components to determine the spatial electric field intensity and the field source direction. The spatial electric field intensity is compared with preset safety threshold values and critical threshold values respectively to determine the alarm level of the position where the safety helmet is located. The alarm module is used for outputting corresponding alarm prompts according to the alarm level. The spatial electric field intensity and the field source direction are determined by synthesizing electric field intensity components in different directions, thereby solving the problem that the electric field detection result of the existing safety helmet is inaccurate.

The present application relates to the technical field of channel prediction, in particular to a field strength prediction method and system based on short wave broadcasting, comprising the following steps: acquiring frequency sequence data, calculating jump rate, labeling predetermined jump characteristic frequency band, combining geographical and ionospheric elements to identify path height variation, extracting reflection angle and power change mapping deformation area, and superimposing directivity and strain intensity to predict field strength interval map. In the present application, by synchronously associating geographical space and ionospheric state elements on the basis of frequency sequence feature recognition, the trend of reflection path height variation is mapped through frequency jump behavior, field strength prediction value extraction and directivity attenuation superposition processing under spatial grid granularity are realized, multi-source correlated data is used as support to calibrate the field strength distribution interval of the prediction area, the adaptability and prediction resolution of field strength evaluation under non-static propagation conditions are enhanced, and a prediction framework with time-varying recognition, path feedback and power decrement linkage capability is constructed.

A user device including near-field communication (NFC) circuitry may receive a polling message from an NFC terminal. The user device may obtain information based at least in part on the polling message. The user device may determine a characteristic of the NFC terminal based at least in part on the information. The characteristic may be indicative of a radio frequency (RF) field strength of the NFC terminal. The user device may adjust an RF setting of the NFC circuitry based at least in part on the characteristic. The RF setting may correspond to an RF sensitivity of the NFC circuitry.

The invention relates to a method for determining the position of a radio-based communication device (20) in relation to a motor vehicle (10) having several radio antennas (12, 14, 16, 18, 20), wherein first radio signals are transmitted by means of the radio antennas, which the communication device receives, received field strengths for the first radio signals are recorded, received field strength data are determined and transmitted to the motor vehicle by means of a second radio signal, wherein the position of the communication device (22) takes into account predetermined antenna-specific field strength distribution data, wherein the field strength distribution data specify a field strength distribution for each radio antenna in relation to an ambient area (24) of the motor vehicle.The invention provides that, depending on the antenna-specific field strength distribution data in the area surrounding the motor vehicle, at least horizontally adjacent segment areas (26, 28, 30, 32) are determined, and for each segment area at least one of the radio antennas is determined which is more sensitive for this segment area than at least one other of the radio antennas, wherein the position of the communication device is determined depending on an assignment of the received field strength data to the respective segment areas.

The invention discloses an intelligent electromagnetic scale removal and prevention method based on a hill climbing method and a scale removal and prevention device, and relates to the technical field of electromagnetic scale removal and prevention. Based on step length self-adaptive adjustment and direction switching of a conductivity change trend, electromagnetic field frequency tracks water quality fluctuation in real time, and sudden reduction of scale inhibition efficiency caused by resonance mismatch is avoided; guiding multi-coil phase difference iterative adjustment through a field intensity distribution data table pre-stored by finite element simulation; in addition, the dynamic weight distribution algorithm adjusts the fusion weight in real time according to the deviation degree of sensor data, the misjudgment risk in an oil-containing / high-turbidity scene is inhibited, and errors are reduced. Dynamic frequency adjustment and phase cooperative control reduce an invalid electromagnetic field coverage area, and redundant energy consumption is reduced in combination with a closed-loop updating mechanism.

The present application relates to the technical field of test device, especially to a multi-field coupling accelerated corrosion test device for simulating power grid environment, comprising a salt mist field regulation system, a temperature field regulation system, a humidity field regulation system, an electric field regulation system, a magnetic field regulation system and a real-time monitoring system integrated in a test box, and a central control system adopting parallel bus communication mode and internally provided with a hierarchical signal dynamic scheduling mechanism for priority grading, isolated transmission and bandwidth on-demand allocation of all measurement and control signals of each regulation system, a multi-field synchronous time sequence calibration mechanism for unifying the operation time sequence of each regulation system and adding a global time reference stamp to all measurement and control signals. The present application can avoid the problems of weak electrochemical monitoring signal and distortion loss of dynamic field strength signal, eliminate the multi-physical field loading time sequence disconnection problem caused by independent operation of each system, and improve the authenticity of power grid complex multi-field coupling service environment simulation and the reliability of test data.

This invention relates to the field of underground pipeline location and detection technology, and discloses a method and system for underground pipeline detection based on tracer signals. The method includes: associating a tracer with an underground pipeline; acquiring underground pipeline tracer signals to obtain a target pipeline detection dataset; obtaining the target pipeline detection dataset; comparing and verifying the target pipeline detection dataset with a special identification code to obtain a verification result; acquiring the field strength and phase information of the verified tracer signals to obtain target pipeline information data; obtaining comprehensive positioning data of the target pipeline's horizontal position and burial depth based on the target pipeline information data; and comprehensively analyzing the target pipeline's identity attributes and the comprehensive positioning data to obtain the target pipeline detection result. This invention can thus integrate multi-source detection tracer signals, deeply explore the correlation between pipeline identity attributes and target pipeline location and detection results, and accurately capture special identification codes.

The application discloses a pulse source for SiC MOSFET high-field stress reliability test, which comprises a main switch circuit, a high-voltage module, a driving circuit and an auxiliary power supply; the main switch circuit is connected with the high-voltage module and the driving circuit respectively, and the driving circuit is connected with the auxiliary power supply; the high-voltage module provides high voltage with sufficient power for the main switch circuit; the auxiliary power supply is used for providing various required voltages for the driving circuit; the driving circuit provides a gate driving signal with sufficient power for the main switch circuit; the main switch circuit bears high voltage output by the high-voltage module, performs switching action according to the gate driving signal output by the driving circuit, and outputs a specified high-voltage pulse waveform. The application can apply drain-source voltage with a voltage change rate as high as several thousand volts to SiC MOSFET high-field stress reliability test, and the voltage pulse waveform is controllable, and the application has the advantages of small size, high voltage resistance, simple driving, high power density and the like.

The present application belongs to the field of unmanned aerial vehicle electromagnetic countermeasures, high-power microwave protection and electromagnetic compatibility reinforcement, and particularly relates to a high-power microwave protection method for unmanned aerial vehicle body, which realizes lightweight global shielding by arranging three layers of gradient frequency selective composite skin on the unmanned aerial vehicle body; micro plasma units are arranged on the body gap, and the whole machine cable is replaced by optical fiber to double block the back door microwave coupling; a reconfigurable antenna, two-stage series limiting and a neural network adaptive filtering three-level radio frequency decoupling link are built on the nose; four groups of broadband sensors are arranged on the body to realize microsecond-level electromagnetic threat perception grading; a flight control closed-loop self-healing regulation system containing a bionic optimization algorithm is constructed, which can dynamically adjust the protection power consumption and automatically redundantly reconstruct the fault. The present application can realize a shielding efficiency of the whole machine of greater than or equal to 40 dB under a 1~18GHz, 20kV / m high field intensity environment, and can balance lightweight, communication signal fidelity and long endurance, effectively avoiding problems such as gap resonance, device breakdown and communication interruption, and is suitable for fixed-wing, vertical take-off and landing low-altitude unmanned aerial vehicles.

This invention discloses a system and method for testing the radio frequency interference (RFI) immunity performance of train vehicle equipment. The system includes a test terminal, a mobile terminal, an adjustable bracket, an antenna, and a field strength probe. The mobile terminal houses a power supply and an immunity signal generator. The power supply powers the test terminal and the immunity signal generator, and the immunity signal generator generates and amplifies the RF modulation signal. The test terminal is located on one side of the top of the mobile terminal. This system and method for testing the RFI immunity performance of train vehicle equipment utilizes a mobile terminal connected to the test terminal, antenna, field strength probe, and immunity signal generator to perform RFI immunity testing. The immunity signal generator simulates the RF interference environment, eliminating the need for an anechoic chamber. Testing can be conducted directly within the train carriages after the train assembly is completed and all functions are properly debugged, improving the overall mobility and portability of the testing system.

The invention discloses a fault diagnosis method and system for a transformer, and relates to the technical field of fault diagnosis, and the method comprises the steps: obtaining the discharge type probability distribution and the optimal electromagnetic excitation frequency band based on a discharge feature matrix, and generating an electromagnetic excitation protocol and a spatial feature vector through a frequency band matching algorithm; the method comprises the following steps: acquiring three-dimensional magnetic field distribution data according to an electromagnetic excitation protocol, reconstructing three-dimensional electromagnetic field distribution in a transformer by using an intelligent inversion algorithm, preliminarily identifying a transformer fault area through field intensity gradient analysis and SVM, and acquiring three-dimensional coordinates and an energy density value of the fault area; based on the three-dimensional coordinates and the energy density values of the fault areas, secondary fault verification is carried out through cross validation, effective fault areas of the transformer are screened, and a diagnosis report is generated. According to the transformer fault diagnosis method, dual jump of the transformer fault diagnosis method in feature extraction and spatial analysis is realized through the synergistic effect of the quantum convolutional neural network and the intelligent inversion algorithm.

This invention discloses a detachable electric field probe and calibration method for measuring the specific absorptivity of a vehicle-mounted human body model. The probe includes a metal dipole, a polytetrafluoroethylene (PTFE) ring, a waterproof metal casing, a ferrite magnetic ring, an SMA connector, and a detachable rubber sleeve. To prevent tissue fluid leakage, all components except the radiating element of the metal dipole are housed within the waterproof metal casing. The inner and outer conductors of the SMA connector connect to the upper and lower metal radiating elements, respectively. The ferrite magnetic ring is fitted onto the SMA connector, significantly improving the radiation pattern distortion problem of the electric field probe at low frequencies. The SMA connector connects to an RF receiver and a spectrum analyzer to acquire spectral information and the received power of the electric field probe, which, after calibration, reflects the magnitude of the field strength. This invention enables specific absorptivity measurement over a wide frequency range, featuring small size, low cost, and ease of use. It is suitable for specific absorptivity measurement in vehicle-mounted electromagnetic compatibility testing, medical device evaluation, and related scientific research fields.

The application provides a smart key positioning method, an electronic device and a readable storage medium. The smart key positioning method comprises the following steps: setting a field strength threshold of a smart key at different horizontal angles relative to a target antenna; calculating an actual horizontal angle of the smart key relative to the target antenna through field strength data of the target antenna and an auxiliary positioning antenna; comparing real-time field strength data of the target antenna with the field strength threshold at the actual horizontal angle to determine whether a function is triggered, so that the vehicle can trigger the same function at a specified distance when the smart key is at different horizontal angles relative to the target antenna. In this way, high-precision positioning of the smart key can be realized, and the requirement of triggering a function in a semicircle centered on the target antenna can be better met.

This invention discloses a comprehensive management method for transparent inspection of power grid materials based on the Internet of Things (IoT), belonging to the field of power material management technology. The method includes the following steps: deploying a three-axis vector probe array at the material entry channel to collect multi-point spatiotemporal signals and calculate the field strength distribution, generating an electromagnetic disturbance spatiotemporal matrix, and outputting a radio frequency identification (RFID) tag resonance drift risk matrix. This invention models electromagnetic disturbance sources using a three-axis vector probe array, combines resonance registration fingerprinting and frequency band compensation to achieve dynamic correction of RFID frequency drift, and integrates phase-encoded backscattering and strain acoustic features to ensure identification consistency. By utilizing optical time reference synchronization and phase-programmable metasurfaces to reconstruct the near-field environment, an adaptively adjustable identification space is constructed, improving the identification stability and traceability reliability of power grid materials under high-disturbance environments, thus breaking through the bottlenecks of traditional identification technologies.

The invention discloses a multi-frequency point calibration test method and system for 0-10 Hz ultralow frequency magnetic field immunity. The method comprises the steps of system building, single frequency point reference calibration, test execution and exception handling. When the system is built, the hardware modules are connected according to a specific mode; in the calibration stage, references are established for frequency points of 2Hz, 4Hz, 6Hz and 8Hz; during testing, precise field intensity control and data recording are realized through combination of coarse adjustment and fine adjustment; and verifying the probe position when abnormity occurs. The system comprises an arbitrary function generator, a power amplifier, a radiation ring and a gauss meter, and parameters of each module are adaptive to a frequency band of 0-10Hz. The field intensity larger than or equal to 1000 A / m can be stably generated, the testing precision is improved, the 0-10 Hz frequency band standard testing blank is filled, and the device is suitable for electronic equipment testing in the fields of industrial automation, new energy automobiles and the like.