110 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.

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 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.

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 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.

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.

The application relates to a radio frequency coil design method for transmit array spatial encoding imaging, and belongs to the technical field of magnetic resonance imaging. In view of the problems of low single-dimension coding efficiency, strong coupling interference between coils and nonlinear phase gradient of a 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 coil. Through optimization of the coil structure and decoupling design, the technical scheme achieves multi-dimensional efficient coding, high-precision phase gradient, strong anti-interference and system light weight, and is suitable for the portability and dynamic monitoring scene of low-field magnetic resonance.

This invention discloses a design method, system, device, and medium for an ultra-low profile, high-aperture efficiency transmission array antenna. The method includes: simulating tensor impedance metasurface elements and obtaining the maximum equivalent scalar surface impedance corresponding to different structural parameters; establishing an impedance-structure model; designing the impedance distribution of the tensor impedance metasurface elements; obtaining the structural parameters of the tensor impedance metasurface elements through the impedance-structure model and designing a tensor impedance metasurface; simulating transmission metasurface planar elements and obtaining the transmission coefficient phase corresponding to different structural parameters of the transmission metasurface elements; establishing a phase-structure model; obtaining the structural parameters of the transmission metasurface elements under the target aperture field phase through the phase-structure model and designing a transmission metasurface plane; and designing an ultra-low profile, high-aperture efficiency transmission array antenna based on the designed tensor impedance metasurface and transmission metasurface plane. This invention significantly improves design freedom and facilitates meeting more beamforming and radiation direction design requirements.

A satellite in a communication system may be equipped with: a phased array antenna system comprising various configurations of an antenna array on one or more sides of the satellite; and a repeater system coupled between the one or more receive arrays and the one or more transmit arrays (e.g., for relaying communications via the satellite).

The present invention relates to a target position estimation method based on a distributed RIS transmit array, comprising: using a distributed RIS as a transmit array, wherein the distributed RIS comprises two RIS array surfaces, a target source and a receiving radio frequency chain are respectively provided on two sides of the RIS transmit array, the receiving radio frequency chain is connected to a receiving antenna, and the target source transmits a pilot signal to a space; transmitting the pilot signal to the receiving radio frequency chain by means of the RIS transmit array to obtain a receiving signal; processing the receiving signal to solve for an azimuth angle β and a pitch angle α of the target source relative to the two RIS array surfaces; and on the basis of the azimuth angle β and the pitch angle α, making two rays that respectively pass through the centers of the two RIS array surfaces, and solving for a median value of the shortest distance between the two rays, wherein the position of the median value is the position of the target source. The present invention can improve the positioning accuracy, and increase the operation speed of solving for a target position.

The invention relates to an ultrasonic array device for measuring the top oil temperature of a transformer and a measuring method, the ultrasonic array device comprises an ultrasonic array and a computer processing unit, and the ultrasonic array is composed of an ultrasonic transmitting unit and an ultrasonic receiving and signal conversion unit; the ultrasonic transmitting unit serves as a transmitting array element in the ultrasonic array and is used for receiving excitation parameters and an array element delay table which are transmitted to the ultrasonic transmitting unit by the computer processing unit; the ultrasonic receiving and signal conversion unit serves as a receiving array element in the ultrasonic array and is used for outputting a digital signal after the echo is subjected to amplification, filtering and analog-to-digital conversion; the computer processing unit is used for performing time gating, arrival time extraction and shell section time deduction on the digital signal, and performing inversion according to the sound velocity-temperature relation to obtain and display the oil temperature; the device has the advantages that the structure is simple and reasonable, the body does not need to be transformed, a larger area can be covered, and engineering feasibility is achieved.

The application discloses a DOA estimation method based on a multi-frequency nested MIMO array, and is based on a traditional nested MIMO array and a low-rank matrix completion theory. First, a set of mutually orthogonal multi-frequency detection waves are sent by a transmitting array of the nested MIMO array, are reflected by a target, are received by a receiving array of the nested MIMO array, are subjected to matched filtering, and then a plurality of groups of received signals are generated. A summation cooperative array with uniformly distributed holes is constructed. Signal reconstruction and low-rank matrix completion operations are performed on the summation cooperative array signals, and finally, DOA estimation is performed. Compared with a traditional DOA estimation method based on a sparse array, the DOA estimation method can improve the maximum estimable incident target number and resolution of the array, and reduce complexity, cost and size. Compared with other DOA estimation methods based on low-rank matrix completion and sparse arrays, the application optimizes the array structure for low-rank matrix completion, and improves the array aperture expansion efficiency.

Disclosed is an apparatus for transmission of data comprising multiple sector antennas associated with sectors, each sector antenna of the sector antennas comprising a reception array of antenna array elements and a transmission array of antenna array elements, the apparatus comprising means, for each sector, referred to as current sector, the means being configured for transmitting a subset of the data, associated with the current sector using a subcarrier comprising at least: mapping the subset of the data associated with the current sector to data symbols; and transforming each data symbol using at least one weight vector for obtaining a beamformed data symbol, and modulating the beamformed data symbol with the subcarrier; the means being configured for obtaining the weight vectors by iteratively adjusting the weight vectors to reduce a contribution of self-interference and cross-sector interference in signals of the apparatus.

The application discloses a side scan sonar echo simulation method, system and device fusing the influence of translational error, and the method comprises the following steps: according to the motion speed, motion time and three-dimensional space position error information of the side scan sonar deviating from ideal straight line motion, the three-dimensional space coordinates of the side scan sonar when transmitting and receiving signals are solved; the two-way slant range histories between the side scan sonar and each target in space are calculated respectively; the wideband signal transmitted by the transmitting array element is subjected to corresponding time delay processing; the Doppler phase caused by the relative motion between the side scan sonar and the target is calculated in the time domain, and the corresponding Doppler phase is added to the time-delayed signal; the echo signals of all targets are subjected to coherent accumulation in the time domain to obtain a simulation echo signal; and the simulation echo signal is demodulated in the time domain to obtain a baseband echo signal. The side scan sonar echo simulation method can simulate the echo signal of the side scan sonar when the system has translational error with high precision.

The invention particularly relates to a method for generating high-power microwave beat waves, a transmitting array plane of a phased array high-power microwave system is divided into two or more sub-array planes capable of working independently, each sub-array plane is provided with an independent feed network and frequency synthesizers, and the multiple frequency synthesizers can achieve time alignment through synchronizing signals. And microwave excitation signals with the same or different carrier frequencies can be generated. The plurality of frequency synthesizers output different carrier frequency pulses, each independent subarray surface amplifies signals and radiates the signals outwards, and high-power beat wave pulses can be formed through space synthesis. The types of radiation pulse waveforms of the phased array high-power microwave system are increased, the strike distance of the high-power microwave system is increased, the universality of a killing target is improved, and the method has the advantages that the beat wave generation method is easy to implement, and the pulse waveforms are flexible and changeable.

The present application relates to the technical field of radar sensor, and relates to a millimeter wave radar echo signal processing method and system. When the surrounding environment is detected by a millimeter wave radar, a transmitting array generates and transmits FMCW radar wave detection pulses, a receiving array receives echo signals of the radar wave detection pulses reflected by targets in the environment, and the echo signals enter a receiving signal processor. The received signal pulses are converted into radar digital baseband signal sequences by a radio frequency front end module, a radar echo digital baseband intermediate signal sequence is obtained through first step digital baseband signal processing, the radar echo digital baseband intermediate signal sequence is transmitted to hardware for performing second step digital baseband processing through a high-speed data interface, the second step digital baseband processing is performed, CFAR and AoA detection are finally performed, and information of the detected target is obtained. Compared with a traditional scheme, the data amount of inter-chip transmission is greatly reduced, so that the baseband data scale that can be processed by the radar system is increased, and the radar detection capability is improved.

The application provides a two-dimensional DOA estimation method for arbitrary array single-base MIMO radar based on data rearrangement, and relates to the technical field of array sensor direction finding. The rank structure of a coherent signal covariance matrix is recovered by rearranging a received data matrix through arbitrary array element positions of a transmitting array and a receiving array; S2: eigenvalue decomposition is performed on the signal covariance matrix to obtain a signal subspace; S3: reliable rough estimation is obtained through rotation invariance; S4: an integer ambiguity vector corresponding to spatial phase ambiguity caused by array element spacing greater than half a wavelength is solved; S5: the phase of an array flow pattern with phase ambiguity is compensated, and an accurate estimation value of the 2D-DOA of the target is calculated; the high-precision 2D-DOA estimation problem in a complex scene of a coherent signal source, arbitrary array geometry and phase ambiguity caused by part of array element spacing greater than half a wavelength is solved, unambiguous and high-precision angle parameter estimation is realized, and the estimation accuracy and algorithm reliability are improved.

The application provides a fast MUSIC method for enhancing radar angle resolution, comprising the following steps: step one, establishing an array model equivalent to a radar antenna, and then calculating the distance and direction between each antenna in the array; step two, constructing a spatial spectrum function, and estimating the parameters of a signal through a spectrum peak search; step three, setting one transmitting array element, transmitting chrip signals in one frame, and then the signal received by a single receiving array element in one frame is, and point sampling is conducted on the received signal to obtain the maximum likelihood estimation of a finite-length data covariance matrix. The technical scheme can effectively accelerate the estimation speed of the arrival angle of a target, and can be applied to actual point cloud acquisition.

The present application relates to a kind of ultrasonic A scanning signal assisted B mode imaging methods for detecting liquid drop and bubble in oil-gas-water three-phase medium, the ultrasonic phased array UPA sensor for detecting use is shared M array elements, for the transmitting array element of synthesizing ultrasonic plane wave is Tx, and the array element for receiving ultrasonic wave is Rx;Realize the ultrasonic imaging of liquid drop and bubble in oil-gas-water three-phase medium in two cases, first, in the need of low consumption time detection, and have the condition of preparation for calibrating oil phase sound velocity test model: using BI method can visualize bubble and liquid drop, and AS method measures bubble and liquid drop;Second, in the high requirement of liquid drop measurement robustness, and do not have the condition of preparation for calibrating oil phase sound velocity test model: using BI method can visualize bubble and liquid drop, and measure liquid drop, and AS method measures bubble.