170 results about "Transmit array" patented technology

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 invention discloses an array full-duplex spatial domain self-interference suppression method, which comprises the following steps of: S1, transmitting a desired signal through an analog transmitting array after transmitting beam forming, coupling the desired signal to an analog receiving array through a self-interference channel, and combining received signals of the analog receiving array after receiving beam forming to obtain a combined signal; s2, the power measurement module calculates the power of the combined self-interference signals; changing the received beam forming coefficient for multiple times through a parameter control module to obtain a plurality of self-interference combining power values; s3, estimating an equivalent channel matrix containing the influence of a transmitting beam forming coefficient, a self-interference channel and transmitting and receiving noise; and S4, constructing an optimization problem of minimizing the self-interference power after combination, and solving a received beam forming coefficient to realize self-interference suppression. According to the method, the influence caused by system transmitting noise and receiving noise is comprehensively considered, and the total power of self-interference signals after receiving array combination can be effectively reduced through optimization of the receiving beam forming coefficient.

The invention relates to a radio frequency coil design method for transmitting array space coding imaging, and belongs to the technical field of magnetic resonance imaging. Aiming at the problems of low single-dimensional coding efficiency, strong coupling interference among coils and nonlinear phase gradient in the traditional TRASE technology, axial and radial coding coils are designed based on a target field method and a magnetic dipole method, two-dimensional radio frequency phase coding is realized through reverse current solenoid decoupling combination, and excitation and signal receiving are realized in combination with a saddle-shaped coil. According to the technical scheme, by optimizing the coil structure and the decoupling design, multi-dimensional efficient coding, high-precision phase gradient, strong anti-interference and light system weight are achieved, and the method is suitable for portable and dynamic monitoring scenes of low-field magnetic resonance.

The invention discloses a synchronous perception and backscatter communication method and device based on spatial modulation and backscatter, and relates to the technical field of communication, and the method comprises the steps: transmitting a pilot signal to a label through a transmitting array, modulating the load impedance of the label, and then backscattering the signal to a receiving array; the receiving voltage generated by the receiving array and the original channel matrix are adopted to determine the reflectivity of the clutter tag and the reflectivity of the tag antenna; positioning and identifying the tag based on the reflectivity of the clutter tag; extracting a target channel matrix for constructing a tag from the original channel matrix according to the tag antenna reflectivity; performing spatial modulation on the information bits through a transmitting array, generating constellation symbols and determining an activation label; and backscattering the constellation symbols to the receiving array through the activation tag by adopting the transmitting array, and demodulating and decoding by combining the target channel matrix to output information bits. The backscatter label is accurately positioned and identified in a disordered environment, and spatial modulation is integrated into backscatter communication, so that the reliability of backscatter communication is improved.

Disclosed in the present invention are a wide-angle scanning imaging device, method and system. The device comprises a sonar probe and a device body. The sonar probe comprises an acoustic array and a transceiving processing module. The acoustic array comprises a transmitting array and a receiving array. The transmitting array comprises a group of transmitting transducers. Maximum response axes of the transmitting transducers are distributed in the vertical direction according to preset tilt angles, and a plurality of transmitted beams of the transmitting transducers form wide-angle coverage in the vertical direction. The receiving array performs resolution in the horizontal direction by means of beamforming, and vertical orientations of echoes are estimated by means of double-array output phase differences. The acoustic array performs rotational motion along the central axis of the device body. The transmitting array transmits broadband orthogonal pulses according to a preset period, the receiving array receives echo signals, and the transceiving processing module processes the echo signals according to the central frequency of the transmitted pulses of the transmitting array to obtain an underwater target imaging result. The present invention reduces the impact of underwater multipath interference and the like on phase estimation and improves the 3D imaging quality.

The invention discloses a GPU chip detection method and related equipment, and the method comprises the steps: injecting a low-duty-ratio pulse signal into a stream processor cluster, carrying out the linear frequency sweeping, and generating a frequency space phase resonance diagram; collecting error count and retransmission frequency data during ray tracing rendering, and determining a target focusing area; the target area flow processor is configured to be a phase emission array to generate a steerable electrothermal acoustic wave beam, and an air gap defect area is determined; inputting a spread spectrum signal, applying a random flipping sequence, and calculating air gap defect three-dimensional parameters through a multi-physics field inversion model; and adjusting clock frequency according to the air gap parameters, controlling offset beams, adjusting power consumption of a stream processor, and executing a test to judge the qualification of the GPU. According to the method, the nano air gap defect in the GPU structure can be effectively detected, and the accuracy and reliability of GPU quality detection are remarkably improved.

The invention relates to the field of integrated circuits, in particular to an MAC operational circuit, a CIM circuit and a chip based on double-bit-line self-circulation switching. The circuit comprises a calculation array, a transmission array, a quantization unit, a signal switching unit and an output module. The calculation array is composed of two twinborn calculation units connected to each SRAM unit, and the two twinborn calculation units have the same multiplication function; the signal switching unit is used for outputting a calculation control signal so as to alternately discharge the calculation bit lines connected with the two twin calculation units, and controlling the two calculation bit lines in the transmission array to be alternately connected to the ADC; the ADC of the quantization unit combines the total discharge capacity of the two calculation bit lines to obtain the value of the low-order MAC result, and the output unit obtains the value of the low-order MAC result according to the number of times of overturning of the output signal of the signal switching unit. The problems that an existing circuit is insufficient in precision and large in area and power consumption are solved.

The invention provides a cable lead sealing internal defect positioning method based on vector full focusing, and the method comprises the steps: obtaining a transmitting array element, a receiving array element and an echo signal when a one-dimensional ultrasonic array scans a cable lead sealing in a full-matrix capture mode according to an array element combination mode; generating a signal intensity distribution image according to the echo signal by using a full-focus algorithm; selecting a defect signal and a position coincidence condition from the signal intensity distribution image to obtain a defect point and a position; constructing a vector coordinate system and registering the vector coordinate system with the signal intensity distribution image to obtain the vector length and direction of the defect signal; obtaining the defect type of the defect point according to the vector length, direction and position coincidence condition of the defect signal; and a three-dimensional model of cable lead sealing is simulated on the global coordinate system, and automatic positioning and labeling are performed according to the position and the defect type of each defect point. By implementing the method, the problems of directional information loss, high small defect omission ratio, poor complex structure adaptability and the like which generally exist in the existing mode can be solved.

The invention discloses a dynamic temperature field real-time reconstruction method and system based on multi-source sound wave data, and relates to the technical field of fire monitoring and early warning, and the method comprises the steps: deploying a sound wave receiving and transmitting array in a target region, constructing a multi-source sound wave measurement network, and determining a signal track space; connecting a visual simulation platform, constructing a verification database and storing the verification database to a platform data center; developing a reconstruction unit in the visual simulation platform, and determining a reconstruction temperature field; and executing linear measurement and calculation based on acoustic trajectory points and interpolation compensation of a non-trajectory region by taking a preset distributed interval as a constraint. According to the invention, the technical problems that the measurement is easy to interfere and the internal temperature is difficult to accurately acquire in real time in the high-temperature and dynamically-changing complex environment in the traditional method are solved, and the technical effect of accurately acquiring the internal temperature field information in real time in a non-contact manner in the high-temperature and dynamically-changing complex environment is achieved.

The invention belongs to the technical field of wireless communication physical layer secure transmission, and relates to an RIS-assisted mobile antenna security ISAC system and a joint scheduling optimization method, the RIS-assisted mobile antenna security ISAC system comprises a base station, an RIS, an eavesdropper and a plurality of legal users, the base station is used for sending signals to the legal users, a radar senses the eavesdropper, and the RIS is used for assisting secure communication; the base station is a dual-function base station MA-BS; the base station is provided with a transmitting array and a receiving array of movable antennas, and the legal user and the eavesdropper are provided with single antennas; no line-of-sight link exists between the base station and the legal user and between the eavesdroppers, the base station points the beam to the RIS through beam forming, and the RIS carries out phase modulation on the beam and then points the beam to the legal user and the eavesdroppers respectively; the beam pointing to the eavesdropper is reflected from the eavesdropper, is subjected to RIS phase modulation, and is returned to the base station for sensing the position of the eavesdropper; according to the system disclosed by the invention, the safety communication performance between the base station and the user in different scenes is ensured by utilizing the high spatial freedom degree of the movable antenna.

Systems and techniques are provided for wireless communications. For example, a process can include, obtaining a message for transmission to a receiving device, determining a plurality of beamforming weights for transmitting a portion of the message toward a direction of the receiving device. A number of beamforming weights is equal to a number of transmit array elements. Each beamforming weight corresponds to a respective transmit array element. A beamforming weight is configured to turn off a transmit array element during transmission of the portion of the message. The process can include outputting an array puncturing notification indicative of transmission of the portion of the message by the plurality of transmit array elements with the transmit array element corresponding to the beamforming weight turned off and transmitting the portion of the message by the plurality of transmit array elements with the transmit array element corresponding to the beamforming weight turned off.

The invention provides an MIMO (Multiple Input Multiple Output) antenna system of a vehicle-mounted radar, the vehicle-mounted radar and a related layout method. The MIMO antenna system comprises a plurality of transmitting array elements, and the coordinates of the plurality of transmitting array elements in the azimuth dimension are different; a plurality of receiving array elements, wherein the coordinates of the plurality of receiving array elements in the pitching dimension are different; and a plurality of cascaded radio frequency chips, wherein the radio frequency chips are used for respectively providing a transmitting channel and a receiving channel for the transmitting array element and the receiving array element. According to the MIMO antenna system provided by the invention, the azimuth angle resolution and the pitch angle resolution of the vehicle-mounted radar can be improved, the perception capability of the space angle of the vehicle-mounted millimeter wave radar is enhanced, and meanwhile, a relatively long detection distance can be achieved.

The invention relates to the technical field of ultrasonic transducers, particularly provides a system, method and equipment for measuring the flow velocity of fluid in a pipeline and a medium, and aims to solve the problem of low measurement precision of the flow velocity of the fluid in the pipeline. In order to achieve the purpose, the system for measuring the flow velocity of the fluid in the pipeline comprises an ultrasonic flowmeter and the pipeline, the ultrasonic flowmeter comprises a plurality of ultrasonic transducers, each ultrasonic transducer comprises a circuit printed board, a transduction chip arranged on the circuit printed board, a transmitting array and a receiving array, and the transmitting array and the receiving array are arranged on the transduction chip. The first ultrasonic transducer and the second ultrasonic transducer are installed on the two sides of the pipeline respectively, and a target included angle is formed between the connecting line of the first ultrasonic transducer and the second ultrasonic transducer and the flow direction of fluid in the pipeline. According to the invention, the use of a transmitting / receiving change-over switch is avoided, so that a signal processing link is simple, the complexity of the system is reduced, the deployment cost of the system is reduced, and the measurement precision of the fluid flow velocity is improved.

The invention relates to the technical field of ocean monitoring, and particularly discloses a transducer array-based seabed sound velocity gradient in-situ measurement device, which comprises a transducer array unit, a depth adjusting unit, a transmitting and receiving control unit and a data processing unit, the transducer array unit comprises a plurality of transmitting transducers and a plurality of receiving transducers, the plurality of transmitting transducers form a transmitting array, the plurality of receiving transducers form a receiving array, and the opening angles of the transducers in the transmitting array and the receiving array are set to ensure that the plurality of receiving transducers can receive signals from the transmitting array. A protective shell is arranged outside the transmitting array and the receiving array, and the strength of the protective shell is enough to ensure that the protective shell can penetrate into seabed sediments with various hardness degrees; the depth adjusting unit is respectively connected with the protective shells of the transmitting array and the receiving array; by adopting the technical scheme of the invention, fine measurement of the acoustic characteristics of the seabed shallow sedimentary layer can be realized.

The invention discloses a side-scan sonar echo simulation method, system and device fusing the influence of translation errors, and the method comprises the steps: carrying out the simulation of the echo of a side-scan sonar according to the motion speed and time of the side-scan sonar and the three-dimensional space position error information of the side-scan sonar deviating from ideal linear motion; calculating three-dimensional space coordinates when the side-scan sonar receives and transmits signals; respectively calculating a two-way slant range process between the side-scan sonar and each target in the space; performing corresponding time delay processing on the broadband signal transmitted by the transmitting array element; calculating a Doppler phase brought by the movement of the side-scan sonar relative to the target in a time domain, and adding a corresponding Doppler phase for the delayed signal; coherent accumulation is carried out on the echo signals of all the targets in the time domain to obtain simulation echo signals; and demodulating the simulation echo signal in the time domain to obtain a baseband echo signal. According to the side-scan sonar echo simulation method, the echo signal of the side-scan sonar can be simulated with high precision when the system has translation errors.

The present disclosure relates to a machine learning (ML)-based receiver that is computationally efficient, irrespective of a number NR of receiver antennas used in a Multiple Input Multiple Output (MIMO) scenario. To achieve this, the ML-based receiver is configured to obtain a modified matrix and a modified array of symbols based on a channel state information (CSI) matrix and a received array of symbols. The modified matrix has a dimension NT×NT, where NT is a number of MIMO layers. The modified array of symbols has a dimension NT. After that the ML-based receiver is configured to restore a transmitted array of symbols from the received array of symbols by applying a pre-trained ML model that receives the modified matrix and the modified array of symbols as input data and outputs a set of bit log-likelihood ratio (LLR) estimates for the transmitted array of symbols.

The invention discloses a PMUT array ultrasonic transceiver circuit system, and relates to the technical field of electronic circuits and systems, and the system comprises a GPU processing module, an FPGA main control module and an ultrasonic analog circuit. The GPU processing module generates an optimal array element gating matrix by using an array element gating matrix generation model; the FPGA main control module drives the ultrasonic analog circuit to perform time-sharing gating on the transmitting array element and the receiving array element according to the optimal array element gating matrix; performing phase control excitation on the transmitting array element when the transmitting array element is gated; performing beam forming on the processed ultrasonic echo signal when the receiving array element is gated; the ultrasonic analog circuit performs time-sharing gating on the transmitting array element and the receiving array element, and generates a high-voltage pulse when the transmitting array element is gated; ultrasonic echo signals are collected and processed when the receiving array elements are gated; and the GPU processing module performs three-dimensional image reconstruction according to the synthesized ultrasonic echo signal to obtain a three-dimensional ultrasonic image. According to the invention, the imaging speed and resolution are improved.

The invention belongs to the technical field of underwater acoustic transducers, and particularly relates to a high-performance transceiving integrated cylindrical array underwater acoustic transducer, which comprises a cylindrical array sensitive element, a rigid prism supporting structure, a sound absorption layer and a waterproof sound transmission layer, and is characterized in that the cylindrical array sensitive element comprises a sound wave transmitting array unit and two sound wave receiving array units; the two sound wave receiving array units are located at the upper end and the lower end of the sound wave emission array unit respectively, the sound wave emission array unit is bonded to the middle of the outer side of the rigid prism supporting structure, and the two sound wave receiving array units are bonded to the upper end and the lower end of the outer side of the rigid prism supporting structure respectively. According to the invention, the system structure can be effectively simplified, the environmental average noise is suppressed, the signal-to-noise ratio and directivity are improved, the system has the functions of receiving and transmitting integration, horizontal 360-degree omnidirectional and omnidirectional rotary scanning transmission, multimode coupling is realized, the bandwidth is expanded, the sending voltage response is increased, and the receiving sensitivity is increased.

The invention discloses a dynamic cooperative wireless charging system control method based on a genetic gradient optimization algorithm, and the method comprises the steps: carrying out the global search based on a genetic algorithm, taking the transmitting power and phase angle of a transmitting coil of a group of transmitting arrays as particles for coding, and evaluating the adaptation degree of individuals in a population through building a fitness function. Iteration of the population is realized through roulette selection and self-adaptive crossover and variation; when the population diversity is insufficient, triggering gradient descent to carry out local deep optimization on the optimal individual; selecting excellent individuals of current genetic iteration, and performing gradient calculation and updating by taking phase angle parameters of the excellent individuals as particles; and combining the phase angle parameter with the power parameter to form a new population, sorting individuals in the new population according to fitness, retaining the individuals with the fitness being first 10%, continuing to enter genetic algorithm iteration, and starting a new round of circulation. The energy efficiency of the system is improved, and the convergence speed of the algorithm and the electromagnetic safety are optimized.

The invention belongs to the technical field of radar parameter processing, and discloses a polarization MIMO multi-parameter estimation method and system based on emission polarization modulation. The polarized multiple-input multiple-output high-frequency ground wave radar array structure is composed of a transmitting end and a receiving end; the transmitting end performs transmitting polarization modulation on a target signal transmitted by the transmitting array element through the polarization phase controller; a receiving end receives the echo data of the target after emission polarization modulation, and echo data reconstruction is carried out after pulse pressure processing is carried out on the echo data; constructing a three-order tensor form, and performing tensor decomposition on the three-order tensor form through an alternating least square method; polarization parameter joint estimation is carried out by using a multi-parameter joint estimation signal processing method. The invention aims at designing a novel high-frequency ground wave radar transmitting and receiving array structure and a P-MIMO-HFSWR signal processing method, and multi-parameter high-precision estimation of a sea surface target is realized.

The invention discloses a DNA molecular marker rapid detection system and method based on imaging spectrum light splitting, and belongs to the technical field of molecular biological detection. The system comprises an exciting light array 1, a receiving and transmitting integrated detection light path 2, an optical fiber transmission array 3, a light splitting module 4, spectral data processing software 5 and a push-broom structure 6. The excitation light array 1 realizes excitation of different labeled samples; the receiving and transmitting integrated detection light path 2 reflects and focuses the array exciting light to a sample and converges fluorescence generated by the sample to an optical fiber input end; the optical fiber transmission array 3 realizes single-row multi-sample fluorescence transmission; the light splitting module 4 is used for dispersing exciting light and fluorescent light of multiple samples in a single row; the spectral analysis processing software 5 is used for acquiring and preprocessing data; the push-sweeping mechanism 6 realizes row-by-row detection of multiple rows of samples. According to the technology, high-throughput, high-sensitivity and rapid detection of the DNA molecular marker is realized. The method is suitable for the fields of fake material evidence identification, food and biological safety and the like, and has the advantages of simplicity and convenience in operation, strong anti-interference performance and the like.

The invention discloses a receiving and transmitting optical path alignment method, electronic equipment and a readable storage medium, the receiving and transmitting optical path alignment method is applied to a laser radar, the laser radar comprises a transmitting array, a receiving module and an optical assembly, and the method comprises the following steps: the receiving module obtains N frames of first grayscale images, the first gray level image is a gray level image of an emission light spot projected by the detection light on the target plate, the N frames of first gray level images are in one-to-one correspondence with N first candidate positions of a first element, the N first candidate positions are arranged at intervals along a first direction, the first element is an emission array or an optical assembly, and the first element is a second element. The first direction is perpendicular to a horizontal plane where an optical axis of the laser radar is located or a vertical plane where the optical axis is located; obtaining a first parameter value corresponding to the first grayscale image according to the position of the first grayscale image on the receiving surface; and determining a first target position in the N first candidate positions according to the N first parameter values. Through the above mode, the light modulation of the laser radar can be simply and rapidly completed, and the AA accuracy is high.

The application discloses a STCA-MIMO radar anti-interference method based on nonlinear time delay, which comprises the following steps: calculating target echo signals based on nonlinear time delay of transmitting array elements; carrying out digital mixing and matching filtering on the target echo signals to obtain preprocessed signals; determining a first transmitting steering vector and a first receiving steering vector according to the preprocessed signals; calculating a covariance matrix of STCA-MIMO radar system receiving data; calculating an adaptive weight vector by using a robust direct data domain beam forming technology based on the covariance matrix and an actual receiving-transmitting joint steering vector of a target; calculating a first receiving-transmitting joint steering vector of the STCA-MIMO radar system; and carrying out beam forming by using the first receiving-transmitting joint steering vector and the adaptive weight vector. The application can effectively suppress interference signals in the main lobe of the STCA-MIMO radar, and solves the problem of the decline of interference suppression performance in the prior art when the interference is located near the distance grating lobe of the main lobe of the real target.

The application relates to the technical field of space optical communication, and discloses a MIMO optical transmission system for a cluster unmanned aerial vehicle and a method thereof, which comprises a flight control computer, a transmitting array, a receiving array and a baseband processing unit. The baseband processing unit acquires the three-dimensional position and attitude matrix of a transceiving node, carries out coordinate system transformation, screens out candidate transmitting arrays satisfying geometric alignment conditions, reconstructs an aerodynamic wake turbulence field in combination with a motor rotating speed parameter, carries out integral of refractive index disturbance along a path to eliminate arrays blocked by air flow, drives a flight control loop to perform attitude biasing when the effective array is limited, carries out channel optimization, then splits data into spatial mapping bits and light intensity modulation bits, selects a specific array to send optical pulses, and the receiving end uses a lens to carry out spatial isolation and focusing on incident light beams, and demodulates and restores data in reverse according to the photoelectric current characteristics. The application realizes feedforward avoidance of complex air flow interference and dynamic optimization of limited channels, reduces line transmission crosstalk, and guarantees communication quality.

The application discloses a kind of based on space modulation and reverse scattering's synchronous sensing and reverse scattering communication method and device, it is related to communication technical field, including: through transmitting array to tag pilot signal and modulate the load impedance of tag again backscatter to receiving array;Using the receiving voltage generated by receiving array and original channel matrix determines clutter tag reflectivity and tag antenna reflectivity;Based on clutter tag reflectivity positioning and identification label;From original channel matrix, according to tag antenna reflectivity, extract and construct the target channel matrix of label;Information bits are spatially modulated by transmitting array, constellation symbol is generated and active label is determined;Using transmitting array, constellation symbol is backscattered to receiving array by active label, and combined with target channel matrix, demodulation and decoding output information bits.In the disorderly environment, reverse scattering label is accurately positioned and identified, and space modulation is integrated into reverse scattering communication, and the reliability of reverse scattering communication is improved.

The invention discloses a lens antenna system with a flexibly reconfigurable wave beam, and the system comprises a lens antenna which comprises a target lens and a multi-path receiving and transmitting array arranged on the surface of the target lens; one side of the signal conversion module is connected with the multi-path transceiving array; one side of the digital domain coding module is connected with the other side of the signal conversion module; the target lens is used for adjusting wavefront phases of received and transmitted electromagnetic waves and focusing or parallelizing the received and transmitted electromagnetic waves; the multi-path receiving and transmitting array is used for forming receiving and transmitting directional diagrams in multiple directions through the target lens; the signal conversion module is used for converting signals between the multi-path transceiving array and the digital domain coding module; and the digital domain coding module is used for carrying out digital domain coding processing on the digital domain transmit-receive signal. According to the lens antenna system, the beam forming performance can be improved, meanwhile, flexible reconstruction of the beam is achieved, the anti-interference capacity of the lens antenna system can be improved, and the application scene of the lens antenna system can be expanded.

The present invention discloses a high-resolution, wide-band imaging method for an airborne bistatic MIMO radar, comprising the following steps: obtaining an optimal pulse coding coefficient; encoding a transmitted signal to obtain a coded signal; performing matched filtering on an aliased signal received from a transmitting array element to obtain an echo signal; vectorizing the received signal to obtain a vectorized aliased signal; performing pulse coding compensation on the aliased signal to obtain a compensated echo signal; solving for the common weights corresponding to the echo data matrix to obtain the optimal weights; performing fuzzy echo suppression on the echo data matrix using the optimal weights to obtain a fuzzy-suppressed echo signal; removing the Doppler center fuzziness of the fuzzy-suppressed echo signal from the first receiving array element to obtain a compensated signal; and performing azimuth focusing on the compensated signal to obtain a final unambiguous image. The present invention can effectively suppress range fuzziness in a bistatic system, reduce the impact of fuzzy echoes, eliminate Doppler center fuzziness, and improve imaging quality.

An antenna element for a transmitarray antenna, which includes a receiving antenna portion and a transmitting antenna portion which are spatially separated from each other. The transmitting antenna portion includes a first reconfigurable magneto-electrical (ME) dipole antenna adapted to provide a 0° or 180° phase shift, and the receiving antenna portion includes a second reconfigurable ME dipole antenna adapted to provide a 0° or a 90° phase shift, such that the antenna element is operable to provide a 90° transmission phase progression with 2-bit resolution. The proposed wideband 2-bit RTA element can achieve a reconfigurable 2-bit transmission phase with high transmission magnitude.

This application relates to the field of medical ultrasound measurement technology, specifically providing a method for in-situ measurement of skull thickness and sound velocity using ultrasound. The method includes: acquiring reflected echo data from N transmitting array elements, wherein the N transmitting array elements sequentially transmit ultrasound waves to the location to be measured on the skull, and array elements centrally symmetrical to the transmitting array elements receive the reflected echoes of the ultrasound waves; arranging the reflected echo data from the N transmitting array elements together to form a wave train diagram of the N transmitting array elements; extracting the sound pressure amplitude values ​​corresponding to the normal incident reflection time from the wave train diagram, and superimposing the extracted sound pressure amplitude values ​​to form a superimposed amplitude spectrum, with the maximum superimposed sound pressure amplitude value corresponding to the wave train diagram being the equivalent matching velocity; and calculating the sound velocity and thickness at the location to be measured on the skull based on the equivalent matching velocities at the maximum superimposed sound pressure amplitude values ​​and the normal incident reflection time. This method can accurately measure the sound velocity and thickness of the skull in situ.

The present application provides a communication method, device and system. The method comprises: receiving first information, the first information being used for indicating a first isolation degree and / or a first threshold value, the first isolation degree being an isolation degree between a first port and a second port, and the first threshold value being related to a start-up control value of analog automatic gain control (AAGC); sending second information, the second information being used for instructing to attenuate a second signal; receiving the attenuated second signal; and performing sensing processing on the basis of the attenuated second signal. In the technical solution, an REC instructs an RE to attenuate signals received in a time period when an antenna receiving and transmitting array surface works simultaneously, so that the impacts of the same-frequency interference generated by the leakage of a transmitting signal on a receiving end can be reduced, thereby improving the quality of sensing and subsequent communication.