9 results about "Radiated field" patented technology

The present application relates to a kind of rail transit space electromagnetic radiation monitoring method and system based on radio frequency holography, comprising: obtaining three-dimensional surface boundary data and converting into spatial geometry coordinate matrix flow, receiving probe array collected signal extraction as amplitude aliasing radio frequency signal stream and executing time domain alignment calibration;Call coordinate matrix flow to signal stream mirror image unfolding synthesis virtual holographic antenna receiving data stream;Parse doppler frequency domain disturbance and construct mask level, evaluate channel conversion law and generate trigger token signal;Based on token signal, virtual data stream is screened and intercepted, and coherent holographic receiving flow data is obtained;Joint matrix flow is approximated in reverse to the intercepted data, and space holographic complex tensor is generated, and dynamic hologram is output after three-dimensional digital grid reconstruction.The present application solves the problem of how to reconstruct three-dimensional space electromagnetic radiation field in dynamically changing environment with multi-path reflection characteristics using non-coherent probe array with more simplified hardware structure.

The invention relates to an antenna array plane directional diagram forming method for analyzing and solving a phase weighted value, which comprises the following steps of: analyzing and solving the phase weighted value: obtaining target electric field distribution at an antenna array plane through Fourier transform according to a target directional diagram; electric field distribution is decomposed into a weighted sum of two pure phase fields, and an antenna array plane is divided into two groups of array element subsets which are distributed alternately according to the weighted sum; phase distribution corresponding to the pure phase field is loaded to the two array element subsets, a radiation field with a target forming directional diagram is obtained through array synthesis, and the directional diagram comprises a main lobe corresponding to the target directional diagram and a side lobe caused by a periodic grating lobe; and side lobe optimization: by adjusting the phase distribution of the target directional diagram and traversing the side lobe intensity of the actual directional diagram under different phase parameters, selecting the phase distribution enabling the side lobe to be the lowest as an optimized target phase so as to suppress the side lobe caused by the grating lobe. According to the method, the phase weighted value is solved through rapid analysis, and accurate control over the antenna directional diagram is achieved.

This invention provides a method and apparatus for detecting electromagnetic compatibility radiated emissions from a vehicle, relating to the field of automotive electronics technology. The invention constructs a dynamic ground loop impedance excitation platform in an anechoic chamber, controls the on / off state of metal ground units through a digital ground plane array, generates various test conditions, and simultaneously acquires the vehicle's time-domain radiated field signal and ground loop common-mode current signal. Time-frequency analysis is performed on the signals to identify out-of-standard frequencies, calculates the rate of change of radiated field strength and ground loop impedance relative to the baseline conditions, and quantifies it as a fault sensitivity factor. Based on this, a high-dimensional fault feature fingerprint matrix is ​​constructed. This vector is matched with a pre-set fault mode database to diagnose the main fault source types. By analyzing the spatial dimensions sensitive to ground loop disturbances in the feature fingerprint, and combining this with the vehicle's electrical topology model, the installation location of the fault source is calculated. Finally, a structured report containing diagnostic results, location information, and rectification suggestions is automatically generated.

The invention discloses a single-beam-based precise measurement radar antenna zero drift dynamic calibration method, which comprises the following steps of: arranging precise measurement radar transmitting end and receiving end test instruments, aligning an azimuth axis of an antenna pedestal telescope of a receiving end to an optical axis marker line at a signal source, and then carrying out mechanical error calibration on an antenna zero position. Then, the radiation field intensity value of the antenna is measured through step-by-step scanning of a frequency spectrograph, data segments symmetrically distributed near the zero depth value are selected, virtual zero point coordinates are constructed through a linear fitting algorithm, an error correction model is established based on the virtual zero point coordinates, and error values of different working frequency points are determined; and determining the zero offset compensation amount of each working frequency point, and completing antenna zero drift calibration. Based on the scheme, zero calibration is jointly realized on the antenna mechanical section and the rear-end signal processing side, error compensation is carried out, the tracking precision is greatly improved, and the method is simple and reliable, can be widely applied to the radar equipment antenna calibration process, and has good application prospects and comprehensive benefits.

This invention discloses a far-field measurement system and method for the spatial radiation field of a mobile suspended conductor arc discharge, comprising: a mobile suspended conductor arc discharge device for controlling the arc discharge of the suspended conductor; a signal receiving module for receiving the broadband far-field electromagnetic radiation signal generated by the discharge and converting it into a radio frequency (RF) signal; a signal conditioning module for conditioning the RF signal; a signal analysis module for analyzing the RF signal using a spectrum analyzer and outputting data analysis results; a vector network analyzer for verifying the link matching status between modules; a calibration module for calibrating the device based on a standard reference signal; a data processing module for synthesizing the standard uncertainty based on the calibration data; and simultaneous measurement of four measurement traces: peak value detection, average value detection, sampled value detection, and root mean square (RMS) detection, and calculation of the electric field intensity distribution based on the four measurement traces. This achieves high-precision measurement of the far-field characteristics of the spatial radiation of the arc discharge.

The invention provides a method and device for detecting electromagnetic compatibility radiation emission of a whole vehicle, and relates to the technical field of automotive electronics. A dynamic ground loop impedance excitation platform is constructed in an anechoic chamber, the on-off state of a metal ground unit is controlled through a digital ground plane array, multiple test working conditions are generated, and the electromagnetic compatibility radiation emission of the whole vehicle is detected. Synchronously acquiring a time domain radiation field signal and a ground loop common-mode current signal of the whole vehicle; time-frequency analysis is carried out on the signals to identify standard exceeding frequency points, the change rate of radiation field intensity and ground loop impedance relative to a reference working condition is calculated and quantified into a fault sensitivity factor, a high-dimensional fault feature fingerprint matrix is constructed accordingly, a vector is matched with a preset fault mode database, main fault source types are diagnosed, and fault diagnosis is carried out according to the fault sensitivity factor. And the installation position of a fault source is calculated by analyzing the spatial dimension sensitive to the disturbance of the ground loop in the characteristic fingerprint and combining with a whole vehicle electrical topology model, and finally, a structured report containing a diagnosis result, positioning information and rectification suggestions is automatically generated.

The application discloses a multi-physical field coupling chip package reliability accelerated test and life prediction method, which comprises the following steps: first, a temperature cycle-vibration-humidity-power cycle-thermal shock-electromagnetic radiation field five-dimensional integrated stress test environment is constructed, and each stress parameter is accurately set and applied according to the actual working condition; then, a five-dimensional accelerated test model is established by weighting and fusing each single stress acceleration model, and the weight coefficient is determined based on the actual working condition influence weight; subsequently, finite element simulation is adopted to analyze the stress, heat conduction and electromagnetic coupling effect of the packaging structure, and the acceleration factor is corrected in real time by combining the physical failure (PoF) algorithm; finally, a packaging level life digital image containing failure modes and failure time distribution is constructed based on multi-dimensional data, and reliability test and life prediction are realized. The test time is less than or equal to 200 hours, the life prediction accuracy is greater than or equal to 90%, and the method is suitable for mainstream packaging types such as BGA, CSP, SiP and FlipChip, thereby providing an efficient solution for chip package reliability evaluation.

This application provides a common-aperture antenna and electronic device. The common-aperture antenna includes multiple radiating patches and horizontally polarized feed lines. The horizontally polarized feed lines include a first horizontally polarized feed line and a second horizontally polarized feed line. At least one first shared patch is included among the multiple radiating patches. The first and second horizontally polarized feed lines excite the same first shared patch to generate orthogonal radiating polarizations. By making the radiating polarizations generated by the first and second horizontally polarized feed lines exciting the same first shared patch orthogonal, two radiating fields can coexist on the same patch without coupling, achieving self-decoupling. Furthermore, the first shared patch can be reused in different radiating arrays, significantly improving aperture utilization, forming a common-aperture antenna, and reducing antenna complexity and size.

This invention relates to a frequency-selective surface-based active-passive composite broadband antenna device for use in radio systems such as radar and communications. It is characterized by comprising a cavity-backed 94GHz millimeter-wave antenna loaded with an FSS and a broadband conformal Vivaldi antenna array. The broadband conformal Vivaldi antenna array adopts a cylindrical conformal heel-to-heel Vivaldi antenna form, using a metal cylindrical surface as the mounting carrier for the Vivaldi antenna array, which provides physical support and electromagnetic shielding. The cavity-backed 94GHz millimeter-wave active antenna loaded with an FSS consists of a parabolic rotating surface, a feed horn, a rectangular enclosed metal cavity, and a high-pass FSS mechanism. The rectangular enclosed metal cavity provides electromagnetic isolation between the active antenna and the broadband passive antenna array, confining the near-field electromagnetic field of the parabolic rotating surface within the metal cavity, while the effective radiated field is radiated out through the top FSS. The high-pass FSS mechanism uses a square aperture FSS for high-pass spatial filtering.