1098 results about "Phased array" patented technology

The invention provides a multi-mode ultrasonic fusion pressure vessel weld defect nondestructive testing method and system, and relates to the technical field of nondestructive testing. According to the method, geometric parameters of a welding seam are obtained through three-dimensional laser scanning, and an optimal scanning parameter set is generated; driving ultrasonic phased array equipment to scan for one time and synchronously acquire shear wave full-matrix capture and longitudinal wave linear scanning data; performing energy flow angular spectrum analysis and envelope analysis on the bimodal data, extracting defect feature parameters and constructing a three-dimensional feature tensor; carrying out multi-dimensional feature fusion by adopting Tucker decomposition, and enhancing a core tensor through physical modeling; generating three types of defect indication diagrams including a defect existence possibility diagram, a defect relative scale diagram and a defect space orientation diagram from the enhanced feature tensor; and the three types of indication diagrams are visually presented for comprehensive interpretation of detection personnel. Through multi-modal data fusion and physical modeling enhancement, the defect identification accuracy and detection efficiency are remarkably improved, the false alarm rate is reduced, and reliable technical support is provided for pressure vessel welding seam safety detection.

The invention discloses an intelligent analysis system for ultrasonic phased array detection data of a welding seam, and relates to the technical field of nondestructive testing, and the intelligent analysis system is characterized in that a four-dimensional wave field tensor is constructed by collecting full-waveform ultrasonic data under multi-channel, multi-path and multi-angle conditions; extracting reflected signals which keep time coherence in a discontinuous path, and generating a high-dimensional coherence feature matrix; inputting the features into a self-supervised contrast learning model to obtain a defect semantic embedding vector; recognizing a suspected weak defect area based on the distribution density and the boundary change trend, and performing reverse beam focusing in combination with original data to obtain a defect three-dimensional positioning map; the shape bifurcation index and the boundary stability are calculated through topological analysis, and intelligent discrimination of artifacts and microcrack defects is achieved; the method does not need label data, has high automation and robustness, and is suitable for weak defect identification of complex structure welding seams.

The invention provides an unmanned aerial vehicle part circumferential weld ultrasonic automatic detection method and system, and relates to the technical field of nondestructive detection.The method comprises the steps that 1, a to-be-detected unmanned aerial vehicle part circumferential weld is fixed to an automatic detection platform, an ultrasonic phased array probe is coupled to the surface of the weld, and arrangement parameters and the initial coupling state of the probe are obtained; 2, according to the arrangement parameters and the initial coupling state of the probe, in combination with the curvature characteristics of the welding seam, the motion path length of the probe on the curved surface of the welding seam is calculated, the axial and circumferential composite motion trail of the probe is planned, the probe array is controlled to move along the composite motion trail, and ultrasonic signals are excited and received in a full-matrix capture mode; acquiring an ultrasonic original signal of the welding seam area; according to the method, the compound motion track of the probe is planned by combining with the weld curvature, the signal is synchronously calibrated, and the detection quality of internal defects of the circumferential weld is improved.

The invention discloses a nondestructive testing method for a welding seam of a steel structure. The method comprises the steps that firstly, morphology data of the surface of a building steel structure are obtained through a high-precision laser scanner and an electromagnetic induction technology; coating thickness distribution and weld surface roughness are analyzed based on the morphology data, and a surface information matrix is constructed; then automatically adjusting ultrasonic wave beam parameters of the ultrasonic phased array by using the adaptive parameter regulation and control model and executing detection to obtain a preliminary ultrasonic echo signal; the time-frequency domain difference between the preliminary echo and the reference signal is calculated through an echo signal compensation model, and secondary compensation is completed to obtain an optimized ultrasonic echo signal; fusing the optimized echo signal, the morphology data and the surface information matrix to construct a detection data set, and adopting a pre-trained steel structure detection model to realize defect detection; and finally, evaluating the confidence of a detection result by adopting a three-dimensional confidence evaluation model, performing grading, and performing local re-detection and parameter adjustment on a low-confidence region to form closed-loop optimization. According to the method, the surface state of the steel structure can be adaptively matched, the accuracy of echo signals and the defect detection precision are improved, and the detection reliability is guaranteed through three-dimensional confidence evaluation.

The invention relates to an ultrasonic phased array full-focusing imaging method for acoustic wave multi-path propagation compensation of a layered composite material, which is characterized by comprising the following steps of: arranging an ultrasonic phased array probe with N array elements on a composite material piece to be detected, obtaining complete echo data by taking each array element as a transmitting array element and taking all array elements as receiving array elements in sequence in a full-matrix acquisition mode; a two-dimensional pixel grid is established in an imaging area, a Monte-Carlo perturbation mechanism used for representing the acoustic wave propagation uncertainty in the layered composite material is introduced into a propagation model for each emission array element-receiving array element-pixel point combination, and the acoustic beam emission direction, the propagation path and the equivalent acoustic velocity are subjected to random perturbation, so that the acoustic wave propagation uncertainty in the layered composite material can be represented. Generating a plurality of equivalent sound wave propagation paths, calculating two-way propagation time of each path, and performing weighted statistics on energy contributions of different paths according to array element sound beam directivity to obtain equivalent propagation time delays of pixel points; and performing delay correction on a full-matrix echo signal by using the equivalent propagation time delay, and performing coherent superposition on signals of all transmitting-receiving array element combinations to realize dynamic focusing of a full-pixel grid, and finally reconstructing an ultrasonic full-focusing imaging image with high resolution and high signal-to-noise ratio. The time delay error caused by propagation path deviation and sound velocity non-uniformity in the layered composite material can be effectively compensated, the focusing precision and spatial resolution of full-focusing imaging are improved, meanwhile, an existing TFM imaging frame does not need to be changed, and the method has good engineering implementability and popularization and application value.

The present application belongs to the technical field of wireless communications and radar systems. Disclosed are a dual-band fusion and multiplexing frequency source, chips, a radio-frequency transceiver, a system, and a device. The system comprises: a full-function millimeter-wave CMOS 4+1 phased array chip, which is connected to an antenna end, and is used for realizing signal processing and frequency conversion between a millimeter-wave signal and a C-band intermediate-frequency signal, performing phase control and gain adjustment on the millimeter-wave signal, and providing an internal frequency source and a calibration function; a C-band front end, which is connected to the antenna end, and is used for receiving or transmitting a C-band signal; a C-band / intermediate-frequency transceiver multiplexing chip, which is used for performing frequency conversion between a C-band or intermediate-frequency signal and a baseband signal in a multiplexing manner, and performing signal processing and gain control on the C-band intermediate-frequency signal; a dual-band fusion and multiplexing frequency source, which is used for providing a local oscillator signal; and an all-digital control logic circuit, which is used for providing a control instruction. The present application improves the efficiency and performance of dual-band joint communications.

The invention discloses a phased array weather radar calibration method based on a generalized metal ball calibration theory. Comprising the following steps: in a microwave anechoic chamber, collecting two-dimensional antenna pattern data of a phased array weather radar in at least one working mode and pointing to a plurality of different beams; performing numerical integration on the two-dimensional antenna pattern data, calculating a combined beam main lobe solid angle of the transmitting antenna and the receiving antenna, and calculating an equivalent beam width product; calculating a calibration theoretical reflectivity factor of the metal ball based on the product of the theoretical radar scattering sectional area and the equivalent beam width of the metal ball; actual detection echo data of the phased array radar on the metal ball under different working modes and beam pointing is acquired, and an actual reflectivity factor is calculated; and comparing the actual reflectivity factor with the calibration theoretical reflectivity factor to complete calibration of the phased array weather radar. Aiming at the non-Gaussian working mode of the phased array weather radar, the reflectivity factor of the phased array weather radar can be quantitatively evaluated, and the radar detection performance is improved.

The invention provides a method for detecting a welding seam by adopting an ultrasonic flaw detector, and belongs to the technical field of welding seam detection. The welding seam is divided into small welding sections, and each small welding section is subjected to multi-direction ultrasonic scanning; a scattering attenuation coefficient and a signal-to-noise ratio parameter are calculated to determine an optimal detection position direction vector group and an optimal time frequency group, and then a high-frequency narrow pulse probe is matched with a phased array focusing technology to carry out second detection according to the optimized parameter; and the identified defects are classified and evaluated according to the near surface blind area characteristic parameters, secondary verification is performed by adopting a surface wave supplementary detection algorithm, and finally a weld defect position distribution diagram is generated, so that the technical problem of low defect detection accuracy caused by serious ultrasonic scattering attenuation of a coarse grain structure weld material is solved.

The invention provides a bolt monitoring method and device based on electromagnetic ultrasound and a 3D phased array, and relates to the technical field of bolt monitoring. A two-stage detection process is adopted, firstly, preliminary screening is conducted through electromagnetic ultrasound, an electromagnetic ultrasound device excites ultrasonic waves and receives echo signals, and according to the relation between the intensity of the echo signals and the passing time, a 3D phased array is obtained; constructing a time-intensity curve of each detection section, and rapidly screening candidate sections with abnormal echo signals; the method comprises the following steps: performing comprehensive three-dimensional space scanning on a candidate section through a 3D phased array technology, performing accurate scanning in a three-dimensional space through focused ultrasonic waves to obtain an ultrasonic echo signal of each space point, extracting the ultrasonic echo signal intensity of each space point and calculating a standardized deviation to mark an abnormal point exceeding a set threshold value, and finally marking the abnormal point. And through spatial aggregation analysis, a plurality of abnormal points are aggregated into an abnormal region, so that the defect positioning precision is further improved.

The invention discloses a cable strength detection method and system, relates to the technical field of cable detection, and solves the technical problems that the metal cable detection process is not standard, the defect positioning and quantification precision is low, the contradiction between the non-metal cable detection efficiency and precision is prominent, and microscopic verification is lacked. A high-frequency arc-shaped phased array probe, a bicrystal oblique TOFD probe and an oil-based high-viscosity coupling agent are adopted, a layered focusing technology is combined, laser ultrasonic non-contact detection and ultrasonic microscope high-resolution imaging are adopted for a non-metal cable, and spiral scanning and circumferential fixed-point scanning are combined, so that the defect omission ratio in the circumferential direction is reduced; the abnormal region judgment takes a calibration test block as a reference, the misjudgment rate is reduced, the authenticity is verified through coarse scanning and locking of a core region, fine scanning and acquisition of a high-resolution image and multi-angle imaging, the defect type judgment basis is clear, and the misjudgment rate is reduced.

The invention discloses a detection method for automatic scanning of a fillet weld phased array of a petrochemical device. The method comprises the following steps: firstly, acquiring pipeline surface information in real time based on an environment sensing sensor, and synchronously generating a real-time three-dimensional environment model containing a fillet weld and a probe pose through an SLAM (Simultaneous Localization and Mapping) technology; extracting a characteristic track of the fillet weld as a reference scanning path; on the basis of the path and the real-time pose, the motion trail of the mechanical arm is dynamically planned, and phased array acoustic beam emission parameters are synchronously calculated and adjusted through the Snell law in a back-stepping mode according to the normal vector of the surface of the pipeline; the mechanical arm is controlled to operate along the planned track and execute ultrasonic detection; and finally, fusing the ultrasonic data with the real-time pose to generate a three-dimensional detection result corresponding to the three-dimensional environment model space. The full-process automation of fillet weld detection is realized, the problems of low efficiency, easy track deviation, inaccurate sound beam regulation and control, difficult data visualization and the like of a traditional method are solved, and the detection precision, efficiency and reliability are remarkably improved.

Provided herein are various enhancements for radio frequency antennas and antenna arrangements. In one example, an apparatus comprises a reflector for radio frequency energy having a reflector surface, and a lens element. The lens element is configured to alter a distribution of at least a portion of the radio frequency energy reflected by the reflector surface over a detection area of a feed array positioned a selected distance from the lens element.

The invention relates to the technical field of radio navigation and countering, and particularly discloses an unmanned aerial vehicle interference system and device based on phased array radar direction finding. The system comprises a phased array radar direction finding module, an environment electromagnetic propagation characteristic modeling module, an interference beam dynamic planning module and a digital beam forming interference module. Through constructing a three-dimensional electromagnetic propagation model and based on propagation loss and a multipath effect predicted by the model, a beamforming weight used for pre-compensating environmental influence is optimized and calculated, and finally an interference antenna array is driven to radiate an intelligent beam subjected to environmental pre-compensation, so that high-intensity interference is formed at an actual physical position of a target unmanned aerial vehicle, and the target unmanned aerial vehicle is subjected to environmental pre-compensation. Direction finding errors are overcome, and interference efficiency and electromagnetic compatibility are improved.

The invention belongs to the technical field of phased array radar intermediate frequency simulation, and discloses an intermediate frequency simulation method of a phased array radar, which comprises the following steps: carrying out time sequence anti-interference stabilization processing on beam scheduling information output by the phased array radar in real time to obtain a stable scheduling signal; performing domain division signal feature analysis of a beam pointing domain, a target trajectory domain and a resource allocation domain to obtain a sum path signal parameter, an azimuth difference path signal parameter and a pitch difference path signal parameter; performing coupling relevance verification according to the sum-path signal parameters and the actually measured echo data to obtain an operation abnormity judgment result; when the operation abnormity judgment result indicates that the intermediate frequency injection signal has a fault, performing signal track replacement compensation processing based on the azimuth difference path signal parameter and the pitch difference path signal parameter to obtain a target intermediate frequency simulation signal; performing radar tracking and search mode optimization, and outputting a phased array radar beam control instruction; and the tracking precision of the phased array radar on a complex tracking scene is improved.

The invention discloses a centralized phased array beam control method and system based on an FPGA, and relates to the technical field of phased array beam control, and the method comprises the steps: carrying out the real-time iterative operation through an incremental adaptive correction kernel in a centralized control FPGA, and obtaining an amplitude-phase correction increment and a corresponding target effective frame number; performing increment differential coding on the amplitude-phase correction increment and the corresponding target effective frame number in a centralized control FPGA (Field Programmable Gate Array) to generate an increment differential beam control message; sending the increment difference beam control message to an array element FPGA (Field Programmable Gate Array) at the front end of an array, executing frame-level atom switching according to a target effective frame number, and fusing the amplitude-phase correction increment and a locally stored old beam control weight in the switching process to obtain a final array element beam control weight; generating a real-time beam control directional diagram based on the final array element beam control weight; the stability and convergence precision of beam control are improved, and the bandwidth requirement of a control link is reduced.

The invention discloses a self-adaptive phased array radar and method for severe convection weather detection, and relates to the technical field of meteorological remote sensing detection. The adaptive phased array radar comprises an active electronic scanning array front-end unit which is used for receiving a radar scanning instruction, generating and transmitting an electromagnetic beam based on the radar scanning instruction, receiving a meteorological target scattering echo and generating echo data; the radar signal and data processing unit is used for processing the echo data based on the signal processing parameter instruction so as to generate a standardized three-dimensional meteorological data set; and the cognitive control and resource management unit is used for identifying a region of interest from the standardized three-dimensional meteorological data set and updating a radar scanning instruction and a signal processing parameter instruction based on the region of interest. According to the invention, active, intelligent and adaptive monitoring of strong weather is realized, and the accuracy and reliability of convective weather detection are improved.

The invention discloses a multichannel ultrasonic transducer phased array driving method based on direct memory access. The method comprises a waveform data buffer length determination step, a data path construction step, a phase parameter calculation step, a waveform data synthesis step and a DMA driving step. An independent DMA channel is configured for each GPIO port or each group of GPIO ports corresponding to the transducer array by utilizing the DMA characteristic of a universal microcontroller, and buffer data is transmitted to the output data registers of the GPIO ports automatically and periodically by DMA hardware, so that multi-channel driving signals with accurate frequency and controllable phases are generated in parallel under the condition that CPU (Central Processing Unit) intervention is not needed. According to the invention, high-precision time sequence control comparable with an FPGA (Field Programmable Gate Array) scheme is realized with extremely low hardware cost and CPU (Central Processing Unit) resource occupation, the problem of time sequence jitter of an existing MCU (Microprogrammed Control Unit) scheme is solved, and the method has high stability, high efficiency and excellent expandability.

The application discloses a dual-channel parallel detection airborne phased array radar ground moving target extraction method, comprising the following steps: acquiring coherent pulse train data of an airborne phased array radar; forming sum-difference beam data according to preset sum-difference beam weighting coefficients; constructing a pulse compression matching function to perform pulse compression on the sum-difference beam data; performing platform motion compensation and pulse Doppler processing on the pulse compressed sum-difference beam data; performing high-speed channel determination according to amplitude statistical results of each Doppler unit of the sum beam, and performing CFAR detection; performing low-speed channel determination according to the amplitude statistical results of each Doppler unit of the sum beam, processing low-speed channel data by using sum-difference 3DT-STAP algorithm, and performing CFAR detection and amplitude normalization processing on the processed data; merging the CFAR detection results of the high-speed channel data and the CFAR detection and amplitude normalization processing results of the low-speed channel data, and extracting a point track.

The invention relates to a large-scale folding and unfolding satellite-borne mobile phone direct connection satellite communication phased array, which belongs to the technical field of satellites and comprises a post-stage DBF system and a plurality of antenna sub-arrays. The antenna sub-array comprises a plurality of antenna units and a sub-array level DBF system; the antenna unit comprises a transmitting-receiving common-caliber antenna array plane, a radio frequency transmitting-receiving front end, a multi-channel transmitting-receiving chip and a multi-channel AD / DA chip which are connected in sequence; each of the multi-channel AD / DA chips is connected with the sub-array level DBF system; and the sub-array level DBF system is connected with the post-stage DBF system. The invention focuses on a satellite-borne large-scale foldable phased array technology suitable for mobile phone direct-connection satellite communication, and solves the problem of pain points of a satellite-borne phased array in the mobile phone direct-connection satellite communication by combining a digital multi-beam phased array with a structure folding and unfolding technology. The requirements for the aperture and gain of a satellite-borne antenna for mobile phone direct-connection satellite communication are met through scale expansion, a high-efficiency folding and unfolding mechanism is designed to reduce envelope so as to be suitable for'one-rocket multi-satellite launching ', and the requirements for massive users and flexibility and variability of mobile phone direct-connection satellite communication are met through high-efficiency digital multi-beam forming.

The invention discloses a defect identification method and system based on a photoacoustic phased array, a medium and electronic equipment. The method comprises the following steps: acquiring a data set; converting the detection signal in the data set to obtain a time-frequency image; performing image data enhancement processing on the time-frequency image, and constructing a defect image data set; performing feature extraction on the defect image data set through a pre-trained transfer learning model to obtain a feature image; performing feature fusion on the plurality of feature images through an adaptive attention mechanism to obtain a fused feature map; based on the fused feature map, defect identification and classification are carried out through a classifier, and defect information is obtained; wavelet transformation is carried out on a detection signal to obtain a time-frequency image, after image data enhancement processing is carried out, the time-frequency image is sent to a transfer learning model for feature extraction and feature fusion to obtain a fusion feature map, and then identification and classification of defect information are realized through a classifier, so that intelligentization of nondestructive detection is realized, and the accuracy of defect information identification is improved.

The invention discloses a terahertz phased array secondary sub-array sub-band dispersion compensation design method. The method comprises the following steps: step 1, constructing a terahertz phased array system primary sub-array unit and a sub-band bandwidth; step 2, constructing a quadratic subarray and sub-band decision variable constraint condition; step 3, constructing a quadratic subarray and a digital sub-band decision variable group; 4, phased array beam quality optimization target parameters are determined according to terahertz phased array application requirements; step 5, carrying out joint optimization solution on the secondary sub-array and the sub-banding topological structure; and step 6, optimal phase compensation parameter set calculation and compensation processing are carried out. Compared with the existing uniform division or single compensation mode, the subarray and the subband are smaller in scale, the spatial three-dimensional layout is easier to realize, the time dispersion and the spatial dispersion of the broadband large-scale terahertz phased array system are eliminated to a certain extent, and the accurate high-quality direction of the terahertz wave beam is realized.

The invention relates to an anti-multipath Beidou antenna design method based on reconfigurable polarization, and belongs to the technical field of satellite navigation and positioning. The method comprises the following steps: fusing data through a distributed sensing and generative adversarial network, and identifying direct and reflected signals by using a decision tree model; constructing a polarization decision model driven by reinforcement learning, and dynamically switching the polarization state of the antenna through a digital phase shifter array, so that the polarization state is matched with a direct signal and mismatched with a reflected signal, thereby realizing multi-path suppression of a polarization domain; a reconfigurable phased array and a digital beam forming technology are combined, a multipath incoming wave direction is predicted, and dynamic null is constructed for spatial filtering; signal tracking and decoupling are carried out by adopting particle filtering and a long-short-term memory network, a vision-inertial navigation cooperation mechanism is introduced, combined suppression and compensation of a dynamic multipath source are realized, and an anti-multipath positioning result is output. And low-cost and high-precision indoor Beidou positioning is realized.

The invention discloses a phased array radar antenna array plane and air-cooled uniform-temperature heat dissipation structure, which optimizes the structure and layout of a heat dissipation air duct of the antenna array plane, and overall designs component modules and the heat dissipation air duct to achieve the effect that the temperatures of components at symmetrical positions of four quadrants of the antenna array plane are consistent; an independent fan is designed for each heat dissipation air duct, and the air volume is determined according to the heat power consumption of each air duct; a heat pipe is designed on a heat exchange contact surface at the bottom of the heat dissipation air duct to reduce the temperature difference of the assembly along the air duct direction; the heat dissipation air channel is completely sealed and isolated from each functional module in the antenna array plane; the inner surface of the heat dissipation air channel is coated with the infrared ceramic radiation heat dissipation coating, salt spray corrosion can be resisted, heat dissipation is facilitated, and the outdoor environment requirement can be met. Through the design, the temperature difference of the components on the antenna array plane is reduced, and the phase consistency requirement of the antenna array plane components is met.

The invention discloses a spaceborne SAR scene matching curve imaging electromechanical cooperative wave control optimization method based on dynamic programming, and belongs to the technical field of spaceborne SAR. The method comprises the following steps: firstly, acquiring a beam pointing attitude angle time sequence before decomposition by using a satellite-borne SAR non-along-track multi-target imaging satellite-ground configuration joint design and optimization method, and solving a phased array electric scanning angle; secondly, establishing an electromechanical collaborative dynamic planning model comprising a platform mechanical scanning state transition equation, a cost function and a constraint function; initializing parameters such as a mechanical scanning state track, a control input sequence and the like to obtain an initial track and cost; optimal control solution is executed through dynamic planning, and convergence is achieved through inner and outer layer iteration (backward transfer calculation of a control law, forward transfer updating of a track and outer layer correction constraint violation); and finally, outputting a mechanical scanning attitude angle time sequence and a phased array electric scanning angle time sequence, and completing electromechanical cooperative wave control optimization.

The invention discloses a phased array radar signal processing system with deterministic delay, and relates to the technical field of semiconductors, the system carries out equal-length wiring design on a link in a hardware level, a timestamp marking circuit is embedded in the link, a core processing module carries out multi-channel data alignment based on timestamp marks in a software level, and the data alignment is carried out based on the timestamp marks. The multi-channel data transmission delay deviation is solved through elastic buffer control, the most reasonable buffer depth and release phase parameters are determined through calculation, and therefore the buffer delay is minimized, the system achieves deterministic minimum delay through software and hardware collaborative design, data alignment and quick response are guaranteed, and the system is suitable for large-scale popularization and application. Low-delay and high-consistency transmission and processing of multi-channel signals are achieved, so that high-precision pointing control of radar beams and time consistency of multi-target tracking are achieved, and the high-synchronization and low-jitter requirements of phased array radar for high-speed signal processing are met.

The invention provides a high-altitude phased array communication blind area electric power emergency unmanned aerial vehicle route planning method and system, and relates to the technical field of electric power emergency communication, and the method comprises the steps: 1, collecting environment data through a phased array communication device and an airborne environment perception sensor of an unmanned aerial vehicle, and constructing an environment information library; step 2, based on the environment information base, filling and boundary completion are carried out on irregular invalid areas in the polygon of the communication blind area, a continuous effective coverage boundary is formed, the dynamic communication blind area is identified and positioned, and communication characteristic parameters are extracted; and step 3, combining the communication characteristic parameters with preset phased array beamforming capability, unmanned aerial vehicle performance parameters and communication coverage requirements, and constructing a route planning model. According to the invention, the unmanned aerial vehicle can adaptively sense the change of a communication blind area in real time in a dynamic and complex power emergency rescue terrain environment, and the emergency response speed and the power emergency rescue efficiency are improved.

The invention discloses a phased array radar and visible light sensor cooperative sensing power transmission channel external damage prevention method, relates to the field of electric power, and aims to solve the problems that a background along a power transmission line is easily confused with target features, and the multi-scale target detection precision is insufficient. The method comprises the steps of obtaining a target image, and constructing a sample data set; performing pre-training by using the sample data set to obtain a weight model of the Yolov11s network model; dynamic snakelike convolution is introduced, an attention mechanism module and a detection head are added, and an improved Yolov11s network model is obtained; migrating the weight model to an improved Yolov11s network model, training to obtain a weight model suitable for external damage prevention hidden danger detection of the power transmission channel, and performing external damage prevention detection of the power transmission channel by using the model; the method improves the detection precision of various external damage targets of the power transmission channel, strengthens the attention of small targets, and is suitable for different target sizes and complex background scenes.

The invention belongs to the technical field of radar data processing, and relates to a ground target elimination method for two-dimensional phased array low-altitude detection, a medium and electronic equipment. The method comprises the following steps: transmitting a single-frame waveform composed of an airspace detection wave position and a ground sidelobe rejection wave position; selecting the detection point with the maximum power as an effective detection point of the airspace detection wave position, and judging the other detection points as ground side lobe detection points and removing the ground side lobe detection points; and rejecting effective detection points with ground sidelobe rejecting wave positions of which the power is higher than that of the effective detection points from the detection points of the airspace detection wave positions. According to the method, the unmanned aerial vehicle batch starting time is greatly shortened, and unmanned aerial vehicle track batch starting is realized; the contradiction between the detection power and the batch starting time is decoupled, and the ground side lobe target is eliminated; the beam resource utilization rate is improved, and the detection response speed of the radar system to the unmanned aerial vehicle target is improved.

The invention relates to the technical field of laser radar scanning, in particular to an optical phased array laser radar and a scanning method based on an effective target, and the scanning method comprises the steps: S1, obtaining a two-dimensional gray-scale map of a scene through an area array photoelectric detector, and screening out the effective target; s2, extracting a region of interest corresponding to the effective target, distributing point cloud density for the region of interest to generate a point cloud coordinate set, and recording a scanning phase angle of the optical phased array corresponding to each point to be measured; and S3, generating a control parameter set through a preset scanning lookup table. And S4, according to the control parameter set, controlling the optical phased array laser radar to scan each region of interest in sequence, and obtaining three-dimensional point cloud data of the regions of interest. And S5, iteratively executing the steps S1 to S4. The method has the advantages that redundant data are reduced, the complexity of subsequent data processing is reduced, and technical support is provided for optical phased array laser radar scanning imaging with higher performance and energy efficiency.

An ultrasonic transducer array of this invention includes a rigid support plate with a through-hole group including through-holes, a flexible resin film fixed to the support plate so as to cover the through-holes, and piezoelectric elements fixed to the flexible resin film so that middle portions overlap the corresponding through-holes and peripheral portions overlap the support plate, wherein the piezoelectric elements include transmission piezoelectric elements forming transmission transducers that generate ultrasonic waves in response to driving voltage signal having a predetermined driving frequency and one or plural reception piezoelectric elements forming one or plural reception transducers that generate reception voltage signals in response to ultrasonic waves, and wherein the transmission transducer is of a non-resonant type that generates ultrasonic wave without resonant vibration in response to the driving voltage signal and the reception transducer is of a resonant type that performs resonant vibration in response to ultrasonic wave having a frequency corresponding to the driving frequency.