131 results about "Grating lobe" patented technology

The invention relates to a broadband planar array antenna light-operated beam forming method based on multi-task sparse learning, and the method comprises the steps: deducing an array factor expression of a broadband array as priori knowledge through employing a rectangular planar array antenna; constructing a multi-frequency-point beam joint optimization model of the planar array antenna based on the neural network; based on the priori knowledge, calculating a total loss function of the model by using expected broadband array pattern data and a group inhaul cable regularization method, and training a multi-frequency-spot beam joint optimization model; and based on the trained model, obtaining the optimal array layout and the amplitude and delay distribution of each array element, and calculating to obtain a low-sidelobe directional diagram in which the deflection angle is irrelevant to the frequency. According to the invention, the deflection angle of the array radiation beam is kept constant in a broadband range, and the problem of'beam squint 'of a traditional phased array is solved; and meanwhile, the beam sidelobe level of each frequency point is effectively suppressed, and the grating lobe problem of the uniform array on the broadband is avoided.

The invention relates to the technical field of array antennas, and discloses a common-caliber layout-based ultra-wideband array antenna, which comprises a low-frequency unit and a high-frequency unit which are arranged based on a common caliber, and is characterized in that the working frequency of the low-frequency unit covers an fmin-f0 frequency band, and the working frequency of the high-frequency unit covers an f0-fmax frequency band. The low-frequency unit is a broadband dual-polarized antenna, a uniform tight coupling array distributed at equal intervals is formed by adopting a tight coupling principle, and the unit interval is calculated based on a grating lobe suppression condition at the frequency f0. The high-frequency unit is a miniaturized broadband dual-polarized antenna and adopts a sparse array form; the initial unit spacing and the unit number of the sparse array are calculated based on the grating lobe suppression condition at the highest frequency f2 of the f1-f2 frequency band with the side lobe requirement between the f0-fmax frequency bands. The ultra-wideband array antenna gives consideration to full-band array performance, can provide sufficient space for active circuit arrangement, and effectively reduces power consumption and cost.

The invention discloses a non-line-of-sight moving target three-dimensional reconstruction method based on an MIMO millimeter wave radar, and is applied to the technical field of radar target detection in a complex urban environment. Aiming at the problem of difficulty in realizing three-dimensional reconstruction of a non-line-of-sight moving target in the existing radar target detection technology, the method comprises the following steps: firstly, establishing a non-line-of-sight multipath propagation model, and exporting a multipath signal model of an MIMO millimeter wave radar; the invention further provides a multipath signal departure angle (DoD) / arrival angle (DoA) unambiguous estimation algorithm, and solves the problem that a main lobe and a grating lobe are difficult to distinguish in the DoD / DoA estimation process of an existing commercial MIMO radar. And finally, proposing a path-oriented non-line-of-sight target three-dimensional positioning algorithm, respectively positioning the non-line-of-sight target by using different paths, and fusing different path positioning results to form a three-dimensional point cloud. According to the method, three-dimensional reconstruction of a plurality of non-line-of-sight moving targets can be realized, and the correlation problem between paths does not need to be considered.

A method and system for low Earth orbit (LEO) satellite multiple access and communication using grating lobes is disclosed. The method may include: acquiring ephemeris data for a plurality of LEO satellites; predicting an orbital trajectory for each of the plurality of LEO satellites based on the ephemeris data; selecting target satellites using the predicted orbital trajectories; adjusting an antenna array to form grating lobes in the directions of the selected target satellites; and transmitting and receiving data with the target satellites using the adjusted antenna array.

A quad-polarized antenna system according to the present invention comprises a plurality of RF chains, and an antenna array in which rows of first dual-polarized antenna units and rows of second dual-polarized antenna units are alternately arranged in a horizontal direction. The first dual-polarized antenna unit and the second dual-polarized antenna unit have different dual polarization characteristics from each other. The rows of first dual-polarized antenna units are used to form at least one first beam and at least one second beam which have + / −45° polarizations, and the rows of second dual-polarized antenna units are used to form at least one third beam and at least one fourth beam which have 0° / 90° polarizations. The first beam, the second beam, the third beam, and the fourth beam are formed towards different spatial directions, and the first and third beams correspond to main lobes, and the second and fourth beams correspond to grating lobes.

The invention provides a beam forming optimization method for an ISAC system based on a reconfigurable antenna structure, and the method comprises the steps: firstly, designing an energy-saving DFBS based on a TTD reconfigurable antenna architecture based on a downlink terahertz large-scale MIMO ISAC system; the DFBS is switched between the modular MIMO and the uniform MIMO by dynamically controlling the antenna sub-arrays; in the sensing stage, modular MIMO is deployed, and a larger array aperture is realized by using fewer antennas; the beam dispersion effect at the main lobe and the grating lobe is utilized to realize rapid user perception; in the communication stage, uniform MIMO is adopted, and a TTD network is activated to reduce the near-field beam dispersion effect; then, based on the channel state information obtained in the sensing stage, proposing a joint optimization problem of analog / digital hybrid beam forming and TTD network delay so as to maximize a system sum rate; finally, analog beam forming and time delay are designed through a serial time delayer method, and then alternating iteration optimization solution is carried out on digital beam forming.

The present invention discloses a MIMO radar sparse array optimization method based on a sleep monitoring scenario. The sparsity of the array elements is determined in combination with the actual sleep scenario, and the two-dimensional beam angle is constrained. The full angle scan is achieved by changing the beam pointing within the constrained angle, and the highest sidelobe level value of the directional pattern under all angle pointing is obtained. The multi-objective particle swarm iterative model is used to solve the optimal array element spacing, and the excitation coefficient is solved in combination with the convex optimization algorithm, and finally the array element position and excitation coefficient matrix are obtained. Compared with the uniform array, this method reduces the number of array elements, reduces the hardware implementation cost, weight and pressure, and improves the angular resolution; compared with the traditional sparse array algorithm, this method can determine the sparsity of the array elements in combination with the actual sleep scenario, and solves the problem that when the beam pointing changes in the traditional sparse array, the directional pattern will have high sidelobes and large grating lobes, ensuring that the directional pattern under all angle pointing within the constraint range has a low sidelobe level.

The invention discloses an antenna unit capable of being used for a low RCS array, and belongs to the technical field of antennas. The antenna comprises a radiation structure layer and a feed network layer. The radiation structure layer comprises rectangular metal patches and special-shaped metal patches which are arranged in an array. The rectangular metal patches form a 2 * 4 array in the same plane; the number of the special-shaped metal patches is two, and the two special-shaped metal patches are located below the 2 * 4 array. The feed network layer is located below the radiation structure layer, and a T-shaped branch knot is arranged between an upper metal plate and a lower metal plate of the feed network layer; a radio frequency socket is arranged at the bottom of the lower metal floor, and an outer conductor of the radio frequency socket is connected with the lower metal plate; an inner conductor of the radio frequency socket penetrates through the lower metal floor and is connected with a common end of the T-shaped branch knot, and two branch ends of the T-shaped branch knot are connected with the corresponding special-shaped metal sheets through the corresponding feed probes. According to the invention, a radiation function and a scattering control function are integrated, so that the radiation performance of the antenna is ensured, and the RCS of the unit and the scattering grating lobes during array splicing use are obviously reduced.

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 present invention discloses a large-field-of-view scanning method for a laser radar based on a liquid crystal phased array, comprising the following steps: expanding and deflecting a laser light source according to the aperture size of the liquid crystal phased array to obtain a target beam; phase-modulating the target beam using the liquid crystal phased array to achieve beam deflection, continuously changing the applied phase modulation to achieve annular scanning of the beam; reflecting the annular scanning beam using a conical reflector to achieve spatial transformation, thereby converting the circular scan into an arcuate scan and obtaining a preliminary large-field-of-view arcuate scan; reasonably setting the parameters of the conical reflector and the distance between the conical reflector and the liquid crystal phased array to filter out stray light such as grating lobes outside the scanning beam, thereby obtaining a final large-field-of-view arcuate scan. The present invention improves the scanning field of view of a phased array laser radar, filters out stray light such as grating lobes outside the scanning beam, and obtains high-quality large-field-of-view arcuate scans.

The utility model discloses a mining directional antenna, which comprises a reflecting plate, a radiating unit, a forming power division network plate, a feed network cable and a radio frequency connector, the radiating unit and the forming power division network plate are both mounted on a first mounting surface of the reflecting plate, and the radio frequency connector is mounted on a second mounting surface of the reflecting plate. The radiation unit comprises a plurality of radiation subunits, the feed network cable comprises a first feed network cable and a second feed network cable, the plurality of radiation subunits are in coupling connection with the forming power division network board through the first feed network cable, and the forming power division network board is in coupling connection with the radio frequency connector through the second feed network cable; wherein the radio frequency band of each radiation subunit is from 1710 MHz to 2700 MHz, and the radio frequency connector is set as an external port. The antenna is high in transmission efficiency, stable in signal receiving and transmitting, high in sensitivity, low in antenna grating lobe and high in multipath interference resistance.

The application discloses a kind of based on rectangular waveguide lens terahertz two-dimensional multi-beam antenna, including two-dimensional feed array, rectangular metal cavity and rectangular waveguide lens;Two-dimensional feed array includes first metal substrate, first metal substrate is provided with several rectangular waveguide feed units, each rectangular waveguide feed unit is connected with feed port;Rectangular waveguide lens includes second metal substrate, second metal substrate is provided with several rectangular waveguide phase shift units, and the rectangular waveguide phase shift units of adjacent row are mutually staggered distribution.The application is realized two-dimensional multi-beam scanning by the way of two-dimensional feed array bias feed, with the advantages of two-dimensional scanning angle and gain can be arbitrarily designed, large bandwidth advantage.The application adopts rectangular waveguide array to form metal lens, with the advantages of low high-frequency loss, small size;At the same time, through waveguide array staggered and period compression, mirror image grating lobe is eliminated, with the advantages of low grating lobe, large scanning angle.

The invention discloses a tightly-coupled ultra-wideband dual-polarized antenna, and belongs to the technical field of antennas. The antenna is composed of a plurality of antenna units which are arranged in a two-dimensional period. The antenna unit comprises a wide-angle medium matching layer, an antenna radiation layer, a first supporting layer, a resistance type frequency selection surface layer, a second supporting layer and a metal floor layer which are sequentially arranged from top to bottom, and further comprises two feed baluns which are vertically arranged. Wherein the antenna radiation layer adopts an interdigital tight coupling dual-polarization dipole as a radiator. By introducing composite structures such as the wide-angle dielectric matching layer, the interdigital tight coupling dipole and the resistive frequency selective surface, the characteristics of ultra wide band, low profile and high gain are realized at the same time, the impedance matching performance of the antenna under a wide scanning angle is optimized, and the edge truncation effect and the grating lobe problem are effectively inhibited.

The application provides a metasurface array, which is composed of several metasurface subarrays of different shapes; the metasurface subarrays cannot coincide with the original metasurface subarrays after being rotated by 90°, or 180°, or 270°, or being mirror flipped, the application adopts irregular subarray division for a super large scale reflector array, compared with a traditional structure without subarrays, the number of bias lines is greatly reduced, that is, the number of control interfaces of the smart reflector is reduced, under the condition that the performance indicators such as scattering pattern gain and sidelobe are slightly reduced; compared with regular subarray division, the grating lobe level can be obviously suppressed due to breaking the periodicity of the phase center of the subarray, and the application can effectively reduce the system cost, power consumption and engineering implementation difficulty.

This invention discloses a method for suppressing high sidelobes / grating lobes in a wide-area ultra-sparse MIMO radar system, comprising the following steps: (1) Based on a MIMO radar with sparse node distribution, select one set of array elements, each array element transmits orthogonal waveforms to obtain a joint transmit / receive beam pattern; (2) By changing the carrier frequency, obtain joint beam patterns respectively, multiply the obtained beam patterns to obtain an optimized joint beam pattern; (3) Select another set of array elements, repeat steps (1) and (2) to obtain joint beam pattern results under different array configurations; (4) Multiply the joint beam patterns under all array configurations to obtain the final optimized joint beam pattern. By multiplying the carrier agility results of the joint transmit / receive beam patterns obtained from different carrier frequencies of different MIMO radar transmit / receive array configurations, the joint transmit / receive beam pattern optimization is achieved, resulting in a joint transmit / receive beam pattern with lower sidelobes.

The invention discloses a loudspeaker array beam forming method, electronic equipment and a storage medium, and relates to the technical field of beam forming, and the method comprises the steps: obtaining a distance value between each loudspeaker unit in a loudspeaker array and a corresponding impedance boundary, and an impedance value of the impedance boundary; matching a target beam forming filter in a plurality of preset beam forming filters according to the distance value and the impedance value; and filtering the input signal of the corresponding loudspeaker unit based on each target beam forming filter to form an output beam. In practical application, the applicable beam forming filter can be quickly matched only by acquiring the specific impedance boundary parameters of the current environment, the method can adapt to the boundary environment with limited acoustic impedance characteristics, the influence of the impedance boundary on sound wave propagation is accurately reflected, the beam pointing precision and the acoustic contrast are remarkably improved, and the method is suitable for popularization and application. And the grating lobes of the dark area are reduced, so that the optimization of the beam performance is realized on the premise of not needing on-site acoustic measurement, and the universality and the accuracy are both considered.

The invention relates to the technical field of underwater acoustic detection, in particular to an acoustic monitoring system and method based on multi-frequency measurement and grating lobe rejection, and the system mainly comprises a transmitting module, a receiving array and a signal processing module. According to the invention, through fusion of multi-frequency measurement, grating lobe elimination, sparse array design and a weighted splicing algorithm, high-precision and wide-angle acoustic monitoring under the condition of less than or equal to 32 channels is realized. Meanwhile, the system has the advantages of low cost, high flexibility, strong anti-interference capability, strong real-time performance, high resolution, adaptability to complex environments and the like, and has a good engineering application prospect.

The application discloses a log-periodic antenna linear array design method considering grating lobe suppression, and comprises the following steps: acquiring a first direction function of a main lobe direction of a uniform linear array composed of a plurality of point source antenna units changing with a feed phase; acquiring a second direction function of a main lobe direction of the uniform linear array composed of a plurality of antenna units under the influence of a beam width of the antenna units; constructing a normalized direction function of the linear array according to the first direction function and the second direction function; obtaining antenna array direction patterns under different intervals of the antenna units according to the normalized direction function by controlling the intervals between the antenna units, so as to acquire an interval range of the antenna units without grating lobes; and constructing a linear array of a plurality of linearly arranged antenna units according to the interval range. The method can solve the problem that the traditional antenna array uses the mode of changing the intervals, feed amplitudes and phases of the antenna units to control the side lobe level, thereby increasing the complexity and cost of the feed.

The application discloses a large-interval wide-angle scanning phased array antenna design method and system, and belongs to the technical field of array antenna design. The application adopts parameterized setting of block number to improve the degree of freedom of optimization. Since each block condition may exist a better solution, the block type of the region is substituted into the optimization variable, so that the final optimization result can be prevented from falling into a local optimum, and the optimal solution can be more likely obtained. The dense arrangement form of the divided region can effectively control the interval of adjacent array elements, avoid the overlapping of adjacent array elements, and improve the optimization efficiency. In addition, the regular layout is beneficial to the back-end network design, and reduces the complexity of the feed network. The dense arrangement and array element selection combination can effectively enlarge the interval, and can make the interval not appear grating lobe, thereby reducing the number of channels and reducing the cost. The array element position micro-adjustment provides more possibilities for large-angle scanning optimization, improves the optimization efficiency, and breaks the periodic arrangement form.

The invention discloses a satellite-borne phased array low-grating lobe antenna array plane, which is characterized in that a plurality of units are arranged on the array plane, an inner ring and an outer ring are sequentially arranged from the center to the outer side of the array plane, the units on the inner ring are arranged to be a plurality of concentrated structures, the units on the outer ring form a plurality of non-uniform discrete structures, and the units are gradually sparsely arranged from the inner ring to the outer ring. And the periodicity of the array plane is destroyed. The antenna array plane ensures that the antenna core gain is not lost through the inner ring concentration structure, and provides basic performance support for communication / detection; the combination of the outer ring non-uniform discrete structure and the sparse arrangement fundamentally destroys the periodicity of the array plane, scatters grating lobe energy into weak dispersion signals, and achieves powerful grating lobe suppression. Meanwhile, the number of antenna units, matched T / R assemblies and radio frequency channels is greatly reduced through sparse arrangement, the array surface weight and the system cost are remarkably reduced, sufficient space is reserved for heat dissipation, and finally the optimal balance among wide-angle scanning, anti-interference performance and satellite-borne engineering practicability is achieved.

This invention discloses a phase-open-loop hierarchical phase-shifting beamforming method, comprising the following steps: Step 1: uniformly dividing the array beam scanning space into N Scan Step 1: Inject random phase weights into the first phase shifter at the first stage; Step 2: Scan angle θ i Step 4: Apply a scanning phase to the first-stage phase shifter and calculate the phase shift of the first-stage phase shifter; Step 5: Calculate the phase shift of the second to Nth-stage phase shifters using a penetration beamforming algorithm; Step 6: Correct the median shift of the phase shift of each stage phase shifter; Step 7: Repeat steps 3 to 5 until all scanning angles are traversed, and record the maximum grid lobe sidelobe level within all scanning angles as L. l Step 7: Repeat steps 2 through 6 until the maximum number of iterations is reached; Step 8: L l The minimum is L best The corresponding iteration uses the optimal beam phase weight for the full-scan spatial domain. This invention can effectively reduce the grating lobe sidelobe level, is simple to implement, and is suitable for low-cost antenna arrays.

The utility model discloses a low-grating lobe open waveguide antenna in the field of antennas, which comprises a waveguide shell integrally in a horn mouth shape, a small-caliber end of the waveguide shell is an input port, a large-caliber end of the waveguide shell is an output port, and the inside of the waveguide shell is divided into at least three stages of matching steps; the distribution part is fixedly arranged at the output port of the waveguide shell; the suppression part is arranged on the matching step close to the output port of the waveguide shell and connected with the distribution part, the suppression part is of a plate-shaped structure, and the extension direction of the suppression part is the E-plane direction of the waveguide shell; the beneficial effects of the utility model are that the output port of the waveguide housing is provided with the cross-shaped grid bar and the suppression metal block, so that the output port can be divided into four independent open waveguide radiation units for radiation, and the power division network level and grating lobe level of an array antenna formed by the units are reduced.

The invention discloses a millimeter wave high-gain planar super-structure grating antenna, which structurally comprises an excitation waveguide with an electromagnetic wave incident port, a quasi-periodically arranged metal grating structure and a two-dimensional dielectric waveguide with a single-sided conductive layer at the bottom. The antenna adopts a quadruple rotational symmetry structure design, and ensures that radiation modes excited by four ports have consistency. The large-aperture antenna is excited based on a traveling wave mode, periodic modulation of a dielectric waveguide propagation mode is realized through grating loading, and energy is prompted to be radiated in a fast wave form; and meanwhile, a small number of grating units are non-uniformly arranged, so that the grating lobe effect of the antenna array is effectively reduced. Electrically large-size aperture excitation is realized through a low-complexity planar structure, and the antenna has the characteristics of high efficiency and high gain, and can be applied to a millimeter wave communication system.

The application discloses a metal antenna radiation structure and an antenna array, and relates to the technical field of communication. In the main body radiation structure, more than two levels of layered structures are arranged along the height direction, the lateral size of each layer is gradually increased from bottom to top, a stepped expansion amplification structure is formed, gradual transition and impedance smooth change of electromagnetic energy in the vertical direction are realized, effective radiation is realized without loading high-loss dielectric materials, and the problem of efficiency reduction caused by dielectric loss is reduced. The multi-stage metal gradual expansion structure can compress the overall height under the premise of guaranteeing the radiation performance and bandwidth characteristics, optimize the current distribution, enhance the directivity control ability, provide a structural basis for compact arrangement and suppression of grating lobes of the array, and is suitable for low-profile, miniaturization and high-efficiency application scenarios. The technical problems that the radiation efficiency is insufficient and the structural thickness is difficult to be considered under the condition of low profile are solved, and the technical effects that high-efficiency radiation and structural compactness are realized while reducing loss are achieved.

The application discloses a movable array element anti-interference position beam joint method facing unknown direction, introduces movable array elements, and makes array geometry structure be treated as adjustable optimization variable in deployment stage. By changing equivalent array element spacing and pattern structure of the array, the separable degree of expected signal and interference signal incident direction on the spatial response is improved, and the destructive influence of strong interference on the array output when falling in the high side lobe / grating lobe direction of the array is reduced. In each candidate position, an adaptive beam forming process with a pilot sequence as a reference is adopted to directly generate a beam forming weight vector corresponding to the position, so that the mean square error of the receiving output in the pilot interval is minimized. The "movable array element position-performance index" is modeled as a target function to be optimized, and a global adaptive search method based on a probability model is adopted to select the next evaluation position in an iterative manner, instead of exhausting evaluation on all candidate positions.

The invention particularly relates to a sparse array DOA (direction of arrival) estimation method based on an optimized array manifold dictionary, and the method comprises the steps: firstly carrying out the layout optimization of an initial uniform area array through combining a genetic algorithm, constructing an eight-element sparse array structure, and maintaining a directional diagram which is close to a full array while greatly reducing the number of array elements; performing energy screening on multichannel observation signals acquired by the sparse array, and extracting a dominant frequency band to improve an effective signal-to-noise ratio; and an optimized array manifold dictionary is constructed based on a phase compensation mechanism and an amplitude weighting mechanism, and the internal correlation of the dictionary is reduced by minimizing off-diagonal elements of a dictionary Gramer matrix. And on the basis, sparse reconstruction is carried out on the optimized dictionary by using an orthogonal matching pursuit algorithm, so that a direction-of-arrival estimation result of the sound source signal is obtained. According to the scheme, inherent direction finding fuzziness and grating lobes of the sparse array are effectively suppressed, the direction estimation precision is improved, and high reliability and high robustness are still kept under the condition that the number of array elements is remarkably reduced.

The present invention discloses a miniaturized, reconfigurable radome unit and a DC feed network. The radome unit comprises: an upper resonator, an intermediate inductor layer, and a lower resonator, connected sequentially from top to bottom; the lower and upper resonators are symmetrically arranged with the intermediate inductor layer as the center of symmetry, and then orthogonally arranged; and further comprises switching diodes, at least two of which are disposed in the upper and lower resonators, respectively. The present invention allows for the arrangement of more units within a limited space, achieving miniaturization of the radome, improving angular stability and delaying grating lobes, while also enhancing the passband and stopband characteristics of the radome unit through multi-layer cascading.

An array antenna for reducing grating lobes and cross polarization leakage is disclosed. The array antenna includes a plurality of first element units arranged in a first column, each first element unit including two elements having a specific distance that differs from a distance (dy) of one element by a predetermined value; and a plurality of second element units arranged in a second column adjacent to the first column, each second element unit including two elements having the specific distance, the second element units being arranged to be spaced apart from the first element units by a distance (dy) of one element, the first element units and the second element units being alternately and repeatedly arranged in the row direction, each of the first element unit and the second element unit includes one or more dummy patches configured to have no electrical signal connection.

The invention relates to the technical field of medical treatment, in particular to ultrasonic equipment and a signal processing method. The method is used for solving the problem of poor image effect caused by Doppler mirroring. The ultrasonic equipment comprises an ultrasonic probe, a processor, a display and a memory, and the processor is used for adjusting at least one initial emission parameter of the ultrasonic probe according to an included angle between a main lobe and a grating lobe in an ultrasonic signal; performing first spectral analysis on the ultrasonic echo signal received by the ultrasonic probe to obtain an energy peak value of the ultrasonic echo signal, and determining a demodulation frequency corresponding to the ultrasonic echo signal according to the energy peak value; demodulating the ultrasonic echo signal according to the demodulation frequency to obtain a demodulation signal; filtering the demodulated signal, and performing second spectrum analysis on the filtered signal to obtain a spectrum image; the ultrasonic probe is used for transmitting an ultrasonic signal to the detection part based on the adjusted transmitting parameter and receiving an ultrasonic echo signal; and the display is used for displaying the spectrum image.

The application relates to the technical field of wideband digital beam forming, and discloses a large-scale wideband digital subarray beam decoupling and grating lobe suppression method and system.The method comprises the following steps: a subarray array synthesis unit generates array synthesis beam data in a subarray according to received digital signals and array weights in the subarray; an array beam synthesis unit generates array synthesis beam data between subarrays according to received array synthesis beam data in the subarray and array weights between the subarrays; a beam verification unit respectively calculates a main lobe amplitude and a grating lobe amplitude according to the array synthesis beam data between the subarrays, calculates a main-to-grating ratio according to the main lobe amplitude and the grating lobe amplitude, evaluates whether a current subarray division result meets actual engineering use requirements according to the main-to-grating ratio, and stops until all effective subarray division results are traversed; and the subarray division result corresponding to the maximum main-to-grating ratio is taken as a final subarray division result.The application greatly reduces resource consumption and hardware cost, and improves grating lobe suppression effect.