229results about "Electromagentic field characteristics" patented technology

The invention relates to a long-gap discharge leader development speed measurement method based on radiated electromagnetic wave detection. The method comprises a set of high-frequency antennas and a high-speed oscilloscope and a long-gap discharge leader development speed calculating method. The method adopts a certain antenna arrangement form; long-gap discharge radiated electromagnetic wave pulse time is detected simultaneously through the plurality of antennas; leader head position is positioned according to time difference of a signal arriving at different antennas; and furthermore, the long-gap discharge leader development speed can be calculated. The method can effectively improve the measurement precision of the discharge leader development speed, and resolution reaches the level of 0.1 ns.

The application relates to the field of artificial network control, in particular to an artificial network control method, device and system for shielding across a darkroom. By using a fiber link and an internal battery power supply architecture in a fully-closed shielding darkroom, the interference of personnel on a test environment is completely eliminated, monitoring of parameters such as internal temperature and voltage of the integrated darkroom is added, zero-crossing synchronization noiseless operation of phase switching is realized, in addition, user end environment adaptive identification, driving parameter dynamic calibration and equipment life prediction are realized, and the needs of high-precision, unattended automatic phase switching and testing are met.

[Problem] Provided is a measurement system for a radio wave propagation characteristic capable of achieving a measurement with higher accuracy by eliminating influences of a human and a wired cable in the measurement of the radio wave propagation characteristic in a space. [Solution] The measurement system for a radio wave propagation characteristic includes a base station 3 and a mobile terminal 20 wirelessly communicable with the base station 3. The base station 3 and the mobile terminal 20 are mutually synchronized in time, frequency, and phase. A propagation characteristic of a radio wave wirelessly communicated between the mobile terminal 20 moving in a measurement target space and the base station 3 is sequentially measured on a time-series basis in association with each piece of position information of the mobile terminal 20.

In a general aspect, a receiver is disclosed for sensing radio frequency (RF) electromagnetic radiation. The receiver includes a dielectric body having an array of cavities ordered periodically to define a photonic crystal structure in the dielectric body. The dielectric body also has a region in the array of cavities that defines a defect in the photonic crystal structure. An elongated slot through the region extends from a slot opening in a surface of the dielectric body at least partially through the dielectric body. The receiver also includes a vapor or a source of the vapor in the elongated slot as well as an optical window covering the elongated slot. The optical window has a window surface bonded to the surface of the dielectric body to form a seal about the slot opening.

The application discloses a kind of radiotherapy real-time monitoring data processing method and system, it is related to radiotherapy monitoring technical field, comprising: S1, the multichannel environmental disturbance sequence collected by being deployed in radiotherapy environment several non-contact sensors is acquired;S2, based on the multichannel environmental disturbance sequence, spatial disturbance reconstruction is carried out, and the spatial disturbance atlas representing the disturbance source distribution in the radiotherapy environment is generated;S3, based on spatial disturbance atlas, the real-time state monitoring result of radiotherapy process is determined.Through sensor array, multichannel environmental disturbance sequence is acquired, and the perception node network that spatially discrete distribution is formed, can simultaneously perceive the physical field disturbance of different spatial positions in treatment room.

This invention relates to the field of electromagnetic shielding cabinet testing technology, specifically a dynamic performance testing device and method for electromagnetic shielding cabinets. The device includes an environmental testing chamber for placing the cabinet under test and providing a controlled electromagnetic background environment; a dynamic load simulation system mechanically connected to the cabinet under test, used to apply a preset intensity of physical excitation to the cabinet to simulate structural deformation of the cabinet under operation; and a signal transmission system including a transmitting antenna located outside the cabinet under test for generating electromagnetic signals covering a preset frequency band. This invention simulates actual dynamic operating conditions such as vibration and cabinet door opening and closing through the dynamic load simulation system, combines a temperature and humidity control module to simulate different climatic environments, and utilizes a high-speed synchronous triggering module to achieve high-precision synchronization of dynamic load application, electromagnetic signal transmission, and data acquisition. This enables multi-condition collaborative simulation and precise synchronous testing, significantly improving the authenticity and reference value of the test results.

This invention discloses a near-field scanning detection method based on active learning to obtain conducted coupling paths. The method includes: constructing a near-field scanning detection platform; placing the circuit board under test (PCB) in a microwave anechoic chamber; and using the near-field scanning detection platform directly above the PCB to perform detection; obtaining the detection results using an active learning-based near-field scanning method; and obtaining a near-field current distribution map on the PCB at continuous time intervals based on the detection results, thereby realizing the detection of conducted coupling paths. This invention utilizes active machine learning methods to achieve more efficient near-field scanning detection, concentrating scanning points in areas with strong currents and accurately reconstructing the actual current changes of the PCB using the scan results of sparse points, greatly improving detection efficiency. By using near-field scanning detection to reconstruct the current changes on the circuit board, the coupling paths of conducted interference currents on the PCB can be quickly analyzed, meeting the requirements for detecting electromagnetic interference in systems in practical engineering.

The objective is to provide an inspection probe for easily inspecting semiconductor devices without contact. [Solution] The inspection probe head is an inspection probe head equipped with a radiating antenna, and includes a power connector attached to the main surface side of the substrate and connected to the power terminal of the semiconductor element to supply power to the semiconductor element, and a receiving antenna attached to the main surface side of the substrate and connected to the power connector and the power terminal to receive electromagnetic wave signals radiated from the radiating antenna of the semiconductor element. The receiving antenna is formed on the main surface of the substrate.

To appropriately estimate a lightning current that is a lighting parameter on the basis of a radio wave of lightning observed by lightning location systems (LLS).SOLUTION: A lightning current estimation system associates a situation of an observed radio wave in accordance with which piece of past data the situation of the radio wave is close to from accumulation of past radio wave situations and current situations, estimates a lightning discharge path model M on the basis of an estimated radio wave situation and the accumulated current situations, derives a situation of a current of lightning that has struck the earth 4 from the radio wave of the lightning that has struck an apex 1a of a structure 1 and the lightning discharge path model M, and appropriately estimates the situation of the current of the lightning on the earth 4 where the structure 1 is installed.SELECTED DRAWING: Figure 1

The utility model discloses an electromagnetic function test system, include: both side's stand, the stand middle part is installed with the feed source installation platform through the lifting structure, two groups of feed source assembly are installed above the feed source installation platform, the feed source installation platform bottom has the wave absorbing background structure, the wave absorbing background structure middle part places the sample to be measured, the feed source installation platform realizes horizontal direction transverse movement through the translation structure, has the rotary structure in the feed source assembly, thereby realizes the measurement process realizes up and down movement, left and right movement and angle rotation conversion, solves the technical problem of the measurement error of the test system in the prior art is serious, cannot simultaneously compatible P, L wave band material test and high frequency microwave test and cannot achieve the comprehensive electromagnetic function material test analysis of multiple projects.

The application provides a kind of simulated human tissue fluid and its preparation method and application, it relates to wireless communication technical field, the simulated human tissue fluid includes: water, 55wt%~75wt% by mass percentage;Ionic inorganic salt, 2wt%~5wt%;Albumin, 10wt%~18wt%;Lipid, 12wt%~20wt%;Non-ionic surfactant, 2wt%~4wt%;Preservative, 0.2wt%~1wt%.Therefore, by water, ionic inorganic salt, albumin, lipid, non-ionic surfactant and preservative cooperate to simulate the skin of human body, so as to be able to carry out APD test in the frequency range of 10GHz~30GHz, and the stability of simulated skin tissue fluid is good, and the cost is lower.

IC structure (100, 300), exhibiting: comprising a substrate region (100B) with a first doping type and an upper surface (100S); a first and second region (100R1, 100R2) arranged along an X-direction in the substrate region (100B), each of the first and second regions (100R1, 100R2) having a second doping type opposite to the first doping type; and a gate conductor (100G) having conductive projections (P1, P2) extending into the substrate region (100B) in a direction perpendicular to a plane of the upper surface (100S), where: the conductive projections (P1, P2) are electrically connected to each other; at least one section of each of the conductive protrusions (P1, P2) is positioned between the first and second areas (100R1, 100R2); and a first conductive protrusion of the conductive protrusions (P1, P2) and a second conductive protrusion of the conductive protrusions (P1, P2) have different positions in the X direction.

The present invention relates to a battery pack, and a battery pack inspection device for inspecting same, the battery pack comprising: a plurality of cylindrical battery cells; a metal plate for electrically connecting the plurality of cylindrical battery cells; a monopole antenna attached to the plurality of cylindrical battery cells; and an antenna module connected to the monopole antenna.

The application discloses a kind of test device and method for quickly evaluating the shielding performance of cable steel strip, belong to cable technical field.Device includes power supply, copper busbar, copper bar, measurement loop and cooling circulation system;The copper bar is connected with the power supply by the copper busbar;The measurement loop is arranged outside the copper bar;The cooling circulation system is arranged inside the copper bar.This device sets fixed simulation electric field interference environment for steel strip, embeds cooling circulation system, can effectively take away the heat generated by sample due to large current induction in test process, so as to effectively inhibit sample temperature rise, can greatly reduce the test data error caused by sample temperature rise, fundamentally reduce the test data error caused thereby, realize the accurate judgment of cable electromagnetic shielding performance.

Examples relate to a quantum radio frequency (RF) electromagnetic (EM) signal direction finding system. The system includes an arrangement of quantum sensor elements configured to detect RF EM signals, with excitation componentry to optically excite the elements and photodetector circuitry to detect optical emission. A laser system and optical system provide excitation light, while an electronic control and processing circuit receives signals from the photodetector circuitry. The electronic control and processing circuit processes the signals to determine phase differences between elements and calculates an angle of arrival of incoming wireless RF signals.

The present application relates to the field of radio signal identification, and particularly relates to a cross-domain few-shot specific emitter identification method based on self-supervised learning and transfer learning, comprising: adopting a self-supervised joint embedding method, pre-training a first model and a second model by using an upstream task pre-training dataset, regularizing a first autocorrelation matrix output by the first model by using von Neumann entropy, calculating the cosine similarity between the feature projections output by the first model and the second model, and updating the parameters of the first model based on the regularized autocorrelation matrix and the cosine similarity; migrating the pre-trained first encoder to a feature extractor, inputting a downstream task fine-tuning dataset into the connected feature extractor and classification head to fine-tune the feature extractor and the classification head; inputting a wireless signal into the fine-tuned feature extractor and classification head to obtain the predicted transmitter category of the signal. The present application achieves good identification accuracy under the conditions of few samples and low cost.

This utility model discloses a handheld portable lightning warning device, including a circuit board, a shell, a cover plate, a 4G antenna and a Beidou antenna, a signal receiving circuit, an alarm circuit, and a main control circuit. The main control circuit is connected to the 4G antenna, the Beidou antenna, the signal receiving circuit, and the alarm circuit. This utility model achieves positioning and tracking through the 4G antenna and the Beidou antenna, making it easier for users to identify directions in the wild or in areas with weak signals, thereby ensuring user safety. Furthermore, the signal receiving circuit, the main control circuit, and the alarm circuit sense early low-intensity weak discharges and noise changes of lightning within a range of 5-15 kilometers, providing timely audible and visual warnings of nearby or impending lightning discharges to remind users to take shelter from lightning and protect their safety.

The application discloses an eccentric test adjusting structure for large spherical near-field test, which comprises, from bottom to top, a rotary table holding rod, an eccentric jig fixing plate, a horizontal eccentric foam jig, a vertical eccentric foam jig and a calibration horn; the horizontal eccentric foam jig is embedded with a horizontal adjusting assembly; and the vertical eccentric foam jig is embedded with a vertical adjusting assembly. The horizontal eccentric foam jig and the vertical eccentric foam jig are designed in stages, and are respectively responsible for the freedom in the horizontal plane and the vertical direction. The embedded horizontal adjusting assembly and the vertical adjusting assembly can provide higher adjusting accuracy than ordinary gaskets, and meanwhile, the foam jigs themselves can be designed to have a larger adjusting stroke according to requirements, so as to cover the large eccentricity deviation caused by a large radiation carrier.

The application provides a chip radiation source positioning method based on near-field scanning and artificial intelligence. The method comprises the following steps: performing three-dimensional space scanning on a to-be-tested chip in a working state to collect original near-field electromagnetic field distribution data; performing preprocessing and feature extraction on the original data to generate a multi-dimensional feature data set; inputting the multi-dimensional feature data set into a pre-trained deep learning discrimination model for comparison and analysis, and outputting chip radiation source positioning results and internal circuit module discrimination results; and fusing the positioning and discrimination results with chip-related drawings to generate a visual diagnosis report. The near-field scanning technology and artificial intelligence analysis are combined to realize automatic positioning of the chip electromagnetic radiation source, intensity evaluation, and traceability and discrimination of the internal circuit module. The method does not need to rely on manual diagnosis of the radiation source exceeding the standard, improves the efficiency, and reduces the time cost and diagnosis accuracy.

The present application relates to a kind of separation identification and monitoring method and system of radiation background noise, in separation identification and monitoring method, background noise and equipment emission signal are synchronously collected by multiple fixed reference antennas and main antenna, and time synchronization is realized by central synchronous unit.First, based on spectrum comparison, background noise probability is calculated, and first grade is filtered out;Second, baseline model is established according to reference antenna data, abnormal signal is identified and its source is judged, and burst background noise and equipment real emission are distinguished;Second grade is filtered out by using pre-stored feature library for matching identification;Finally, the comparison result of real emission signal and background noise after filtering is displayed on test interface, and the data exceeding the standard is automatically marked, test margin is calculated and conclusion is generated.Compared with prior art, the present application can effectively solve the technical problem that background noise and equipment signal are difficult to separate in real time and accurately in complex electromagnetic environment, and the reliability and efficiency of radiation test are significantly improved.

The application provides an antenna phase center automatic test system, comprising: an antenna transmitting subsystem for transmitting electromagnetic waves; an antenna receiving subsystem for receiving electromagnetic waves; a vector network analyzer for measuring the antenna amplitude and phase of the antenna transmitting subsystem and the antenna receiving subsystem based on the electromagnetic waves; a host computer for drawing an antenna directional diagram and analyzing the offset direction of the antenna center alignment position based on the antenna amplitude and phase measured by the vector network analyzer, and further for controlling a system controller; the system controller is used for realizing the motion control of the antenna transmitting subsystem and the antenna receiving subsystem; and an optical platform is used for mounting the antenna transmitting subsystem and the antenna receiving subsystem. The antenna phase center automatic test system can accurately measure the antenna phase center, has high measurement efficiency and measurement precision, has high integration degree, and can realize the mass production test of the antenna.

An electromagnetic compatibility (EMC) scattering apparatus comprising an attachment component, a scattering cape, and a brace. The attachment component is configured to permit the EMC scattering apparatus to attach to a second object such as a drawer, cable outlet, cable connector, etc. The scattering cape is attached to the attachment component and is configured to scatter energy emitted from the second object by fluttering in response to airflow from the second object. The brace is connected to the attachment component, the brace is configured to keep the scattering cape in an extended position. The brace can also be attached to the scattering cape.

A kind of urban environment based on physical guiding and adaptive spatial focusing radiation source positioning method, this method first utilizes distributed receiving system to receive signal, constructs multimodal electromagnetic observation physical data model, generates multi-channel one-dimensional complex baseband sequence tensor and two-dimensional global space spectrum thermodynamic diagram;Subsequently, extract electromagnetic time domain and spatial geometric features through double-flow parallel topology structure, fuse and output global physical reference anchor point;Then affine transformation matrix is constructed with anchor point as center, and local continuous spatial feature map is obtained by resampling original high-resolution spatial energy spectrum;Further, extract local geometric features and output normalized geographic coordinate residual compensation vector;Finally, combined with reference anchor point, residual vector and physical scaling coefficient, calculate and output the final geographic coordinates of radiation source;The present application effectively solves the problems of poor robustness of traditional physical model and weak generalization ability of pure data-driven method in complex multipath environment in city, significantly improves the radiation source positioning accuracy and stability.

The present application relates to the field of lightning monitoring and early warning, and specifically discloses a power transmission line lightning path early warning method based on total lightning movement direction and coverage range. The method identifies lightning active areas based on a multi-level neighborhood method lightning active area real-time monitoring algorithm, predicts the total lightning movement direction and coverage range of the lightning active area in a thunderstorm process under consideration of the merging and splitting process of the lightning active area, constructs a power transmission line early warning area and early warning index, and issues a power transmission line early warning signal. The method real-time monitors and predicts lightning disaster conditions of each line, calculates the time when a thunderstorm is expected to reach a key tower and the line section that may be affected, realizes fine early warning of "one line, one case" and "one tower, one strategy", and has great engineering practical value and economic significance for ensuring the safe and stable operation of important power transmission channels such as extra-high voltage and cross-region power grids.

The application discloses a partial discharge detection method and device and a nonvolatile storage medium. The method comprises the following steps: based on a plurality of preset sensors, absolute field strength data and electromagnetic wave space-time data inside a cavity of a target device are acquired at a plurality of preset positions inside the cavity of the target device, wherein the plurality of sensors comprise a plurality of Rydberg sensors and a plurality of ultrahigh frequency sensors; the absolute field strength data and the electromagnetic wave space-time data at the same time are integrated to obtain a plurality of joint data frames; and based on the joint data frames, a partial discharge detection result of the target device is determined, wherein the partial discharge detection result comprises a discharge type, a defect position and an insulation state. The application solves the technical problem that the traditional technology is difficult to realize high-precision, multi-parameter and traceable monitoring requirements in a complex electromagnetic environment.

A method, system and assembly are disclosed. A radio assembly includes at least one radio including a radio board, a plurality of filter units, a plurality of clamp elements, and an antenna unit. A subset of the plurality of filter units remain removably attached to the radio board while the remaining plurality of filter units remain removably attached to the antenna unit and plurality of clamp elements based on whether the second plurality of fastening elements are unfastened from a subset of the plurality of second filter mating elements associated with the subset of the plurality of filter units, the third plurality of fastening elements associated with the subset of the plurality of filter units are unfastened from respective first filter mating elements; and the first plurality of fastening elements associated with the remaining plurality of filter units are unfastened from respective radio mating elements.

The present application relates to a mobile foldable flexible electromagnetic field stirrer. The mobile foldable flexible electromagnetic field stirrer comprises a stirrer base, at least two rotating shafts, a rotating shaft sleeve, flexible blades and a blade sleeve. The stirrer base is internally provided with a motor. The two rotating shafts are connected together by means of the rotating shaft sleeve. One of the two rotating shafts is connected to the stirrer base and is driven to rotate by the motor. The flexible blades are connected to the rotating shaft by means of the blade sleeve. The flexible blades are foldable and are made of flexible material.