148 results about "Reference array" patented technology

The invention discloses a broadband digital beam forming method based on a Farrow filter, and the method comprises the following steps: carrying out the DDC down-conversion and phase shift processing of a signal after the analog-to-digital conversion of a broadband signal is completed through an ADC; calculating the delay inequality of each array element signal relative to a reference array element, and decomposing the delay inequality into an integer sampling period and a fractional delay component; a fourth-order Lagrange type Farrow filter oriented to FPGA / DSP optimization is adopted to carry out fractional time delay compensation, and coefficients of the Farrow filter are dynamically adjusted through a polynomial expansion formula; and finally, performing complex weighted synthesis on each channel filtering signal to generate a directional wave beam. According to the method, high-precision fractional delay adjustment is achieved, the Farrow filter is adopted, the tedious process of recalculating coefficients can be omitted, only the P value is changed, and high-precision beam direction control can be achieved under the condition of low calculation amount.

The invention relates to the technical field of array signal processing, in particular to a space-frequency power inversion anti-interference method fusing SMI-LDL decomposition. The problems that an existing space-time anti-interference technology is high in calculation complexity, and real-time processing is difficult to achieve in limited resources of a navigation receiver are mainly solved. The method comprises the following steps: firstly, converting a radio frequency signal received by an array into a digital intermediate frequency signal and carrying out sliding window partitioning processing; windowing the data block and performing FFT (Fast Fourier Transform) to obtain a frequency domain array; then calculating an auto-covariance matrix R of other array elements except the reference array element and a cross-covariance matrix r of the reference array element and other array elements; lDL decomposition is carried out on the auto-covariance matrix to obtain a lower triangular matrix L and a diagonal matrix D, and inversion is carried out on the lower triangular matrix L and the diagonal matrix D respectively, so that huge operand caused by direct inversion of the covariance matrix is avoided; and finally, calculating an optimal weighting vector according to a power inversion criterion, and performing spatial filtering on the frequency domain data.

The invention discloses an indoor multi-sound-source positioning method based on DOA estimation and DOA association, and the method comprises the steps: judging single-source time-frequency points through the correlation of time delay inequality vectors of adjacent time-frequency points between microphones, and constructing a variable-size elastic single-source region; applying the FSSZ distribution condition of the sound source in a reference array to all arrays by using the high correlation characteristic of the FSSZ time-frequency distribution of the same sound source at different microphone arrays in a frame; performing middle DOA estimation on the FSSZs of all the arrays in the whole observation time period by using a circular integral cross spectrum method, and constructing a sound source position histogram in combination with FSSZ aggregation degree weighting; 2D positions of the plurality of sound sources are estimated from the sound source position histogram using 2D-CFAR. According to the invention, under the conditions of indoor reverberation and noise, position estimation can be carried out on a plurality of sound sources with an unknown number, the detection performance under the conditions of positioning precision and missed detection is obviously superior to that of an existing method, and the defects of the prior art are overcome.

The invention provides a directional adjustment method and device for a phased array generated beam and electronic equipment, and relates to the technical field of radar signal processing. The method comprises the following steps: acquiring array parameters of a phased array and equipment parameters of phase shifters corresponding to array elements in the phased array; based on a preset quantization strategy, the array parameters and equipment parameters of phase shifters corresponding to the array elements, phase shift quantization errors of the array elements are determined; determining a reference array element from a plurality of array elements of the phased array, and determining a phase shift quantity adjustment value of the reference array element based on the phase shift quantization error of each target array element except the reference array element in the plurality of array elements; and according to the phasor shift adjustment value of the reference array element, performing phase shift on the reference array element to adjust the direction of a beam generated by the phased array. According to the invention, quantization loss caused by phase shift of other array elements is compensated by performing phase shift on the reference array element, the influence of large beam pointing deviation caused by the quantization precision of the phase shifter is reduced, and the beam pointing precision is further improved.

A camera tracking system receives patient reference tracking information indicating pose of a patient reference array tracked by a patient tracking camera relative to a patient reference frame. A local XR headset view pose transform is determined between a local XR headset reference frame and the patient reference frame. Remote reference tracking information is received indicating pose of a remote reference array tracked by a remote reference tracking camera. A remote XR headset view pose transform is determined between a remote XR headset reference frame of a remote XR headset and the remote reference array. A 3D computer image is transformed from a local pose determined using the local XR headset view pose transform to a remote pose determined using the remote XR headset view pose transform. The transformed 3D computer image is provided to the remote XR headset for display with the remote pose relative to the remote XR headset reference frame.

A multiply and accumulate calculation device including a variable resistor array unit having a plurality of variable resistance elements, a reference array unit having a reference resistance element having a fixed resistance value, a signal input unit that generates an input signal from input data, and inputs the input signal to the variable and reference resistance elements, a first detection unit that detects a current flowing through the variable resistor array unit, based on the input signal applied to the variable resistance elements, a second detection unit that detects a current flowing through the reference array unit, based on the input signal applied to the reference resistance element, and a correction calculation unit that performs a predetermined calculation on the output from the first detection unit, based on the output from the second.

A dynamic random access memory (DRAM) array has a first portion configured as a data array and a second portion configured as a reference array. The DRAM array includes read bit lines which include a first plurality of read bit lines in the data array and a second plurality of read bit lines in the reference array. Read circuitry includes a plurality of sensing circuits, each sensing circuit coupled to a corresponding read bit line of the first plurality of read bit lines and configured to receive a first reference voltage generated by a first read bit line of the second plurality of read bit lines and a second reference voltage generated by a second read bit line of the second plurality of bit lines. The plurality of sensing circuits is configured to provide a corresponding bit of an output read value.

The invention relates to an anti-interference array antenna host with variable array elements, which is composed of antenna characteristic modeling software and an array signal processing host, and is characterized in that the antenna characteristic modeling software is mainly used for modeling an antenna array and can set parameters including the number of array elements, array element spacing, array element positions, an antenna pattern and the like; the wave path difference of navigation and interference signals in different directions reaching different array elements of the array antenna and wavefront simulation parameters such as signal power, time delay and Doppler change values are calculated by taking the reference array element as the center, and the characteristics of different types of array antennas are flexibly simulated; the array signal processing host is mainly used for executing an anti-interference processing algorithm configured by a user, supporting a space-time / space-frequency filtering framework, an LMS / SMI / DMI / RLS inversion method, an LCMV / MMSE / MSINR constraint criterion, zeroing / wave beam and other combined strategies, and flexibly simulating the characteristics of different anti-interference processing modules.

A neuro-navigation accessory system includes components programmed to work with existing neural navigational software. The components include trackers or motion sensors, modified surgical instruments with motion sensors incorporated into the instruments, CT / MRI opaque fiducial(s), surgical head clamps(s), ready-to-use, surgery specific kits, magnetic-field calibration apparatus for magnetic navigation, and internal reference arrays.

The invention relates to an improved variable step length LMS space-frequency anti-interference algorithm based on a dustpan line function. The algorithm comprises the following steps: performing K-point FFT conversion on data with the same length of each array element, and dividing K frequency bands; uniformly dividing each piece of array element data into J-beat data with the length of K; taking the first array element as a reference array element, multiplying other array element data by a corresponding weight coefficient to obtain a sum, and subtracting the sum from the reference array element data to obtain a current deviation value; calculating to obtain an iteration step length value; calculating to obtain a current latest weight; judging whether the iterative calculation of the J-beat data is completed or not and solving the optimal filtering weight; and performing K-point IFFT inverse transformation on the data obtained by multiplying, accumulating and integrating the optimal filtering weight and the corresponding array element data, and outputting the data. According to the method, the size of the iteration step length factor can be adjusted in real time to realize adaptive setting of the iteration step length factor, a weight coefficient error feedback item is introduced to reflect the change trend of the weight coefficient so as to make adjustment in advance, and the convergence speed is improved while the anti-interference performance is ensured.

The invention discloses a thin-wall structure impact positioning method and system based on a dense array and an intelligent optimization strategy, and the method comprises the steps: obtaining an impact stress wave signal, and extracting an impact stress narrow-band wave signal; calculating the propagation group velocity and the wave number of the impact stress narrow-band wave signal; setting initial parameters of an intelligent optimization algorithm; obtaining a fitness function of the intelligent optimization strategy according to a spatial beam focusing algorithm; formulating a population screening mechanism of a directional fitness function; constructing a population screening mechanism of an intelligent optimization strategy, and calculating individuals, wherein the angles between the individuals and the optimal particles and reference array elements in the dense array are smaller than the half-power beam width during each iteration, and the coordinates of the individuals are within the monitoring area range; iteratively searching the reserved individuals meeting the condition; and estimating and predicting the impact source coordinates by adopting a DBSCAN density clustering algorithm and Gaussian kernel density. According to the method and the system provided by the invention, accurate positioning can be realized at a low sampling rate, and a blind area does not exist.

The invention discloses a three-dimensional near-field source positioning method based on a depth feature fusion extraction network, and aims to improve the accuracy and robustness of near-field source positioning. According to the method, a deep feature fusion extraction network is constructed, a near-field source parameter estimation problem is converted into a multi-task learning problem, and multi-task joint estimation of a near-field source emission signal, an X-axis included angle, a Y-axis included angle and a reference array element distance is realized by using a multi-input multi-output neural network architecture; the network effectively fuses and extracts key features through feature fusion, extraction and output of branches, and optimizes network performance through training and verification; the method has the advantages that the method does not depend on a complex signal model, is suitable for the condition that the signal model is complex or uncertain, and can show good generalization ability and robustness.

The invention provides a multi-array sound source localization method based on a particle swarm optimization algorithm. The method comprises the following steps: calculating and obtaining estimated sound source coordinate parameters of a real sound source under each single microphone array; constructing a positioning direction line between the estimated sound source coordinate parameter of each single microphone array and the corresponding reference array element; constructing an optimal target function of the sum of the distances from the optimal sound source point to each positioning direction line after the positioning data of each single microphone array is fused; after the optimal target function of the single microphone array is solved and a sound source position calculation result of the single microphone array is obtained, performing iterative search on a plurality of sound source position parameters of the multi-array microphone array through a particle swarm optimization algorithm until an iteration stop condition is met; and outputting and taking the optimal position parameter as a positioning parameter of a real sound source. According to the invention, the problem of positioning failure of the single microphone array is effectively solved, and the positioning precision of the single microphone array is improved.

The invention relates to the technical field of water quality detection, and discloses a water quality fluoride detection method based on digital image colorimetric analysis, which comprises the following steps: constructing a zirconium-based nano-enzyme probe, and realizing fluorine ion specific recognition through Zr-Mn bimetal coordination and boric acid modification; developing a three-layer paper-based micro-fluidic chip, a fixed zirconium-based nano-enzyme probe, an integrated optical reference array and a distributed temperature control network; multiband light source switching is cooperatively controlled through the smart phone, and reflection and fluorescence bimodal images are synchronously collected; multi-color space features are extracted, and environment parameters are fused to construct a dynamic compensation matrix to correct matrix interference; the corrected features are processed, and the fluoride concentration and the confidence interval are output; and the detection data is encrypted and then written into the block chain, and data verification and standard exceeding alarm are realized through the smart contract. The device and the method have the advantages of simplicity and convenience in operation, low cost, high portability and on-site rapid detection, and are suitable for on-site rapid detection of fluorides in various water qualities.

The invention discloses a Hash connection implementation method, electronic equipment, a computer readable storage medium and a computer program product, and the method comprises the steps: creating a reference table according to an implementation method for foreign key reference and connection query based on an array index, automatically creating a reference array index for the reference table through a specified option when the reference table is created, and automatically creating a connection query result according to the reference array index. Meanwhile, a referenced array index is automatically created for the referenced table; a column of reference is added to the created reference array index, and a new reference array index is obtained; constructing a byte array according to [the maximum subscript used in the quoted array index corresponding to the quoted table / 8] + 1, and setting the content of the byte array as 0; for all records meeting conditions in the referenced table, setting a bit corresponding to the byte array as 1; all units in the reference array index are sequentially scanned, and for the matching condition, the required referenced table and the corresponding record information of the reference table are directly output to an upper-layer operator.

The invention relates to the technical field of hydrological sediment monitoring, and particularly discloses a design method and device for an anti-freeze-thaw steel plate bayonet weir in an alpine region. Firstly, long-term dynamic stability of the geometrical shape of the weir body under frost heaving and thaw collapse is guaranteed through cooperation of the phase-change material temperature control layer and the prestress self-adaptive anchor rods; secondly, an optical fiber reference array embedded into the weir plate and a multi-mode sensor fusion algorithm are utilized, real-time self-calibration of water level and sand content measurement data is achieved, and measurement errors caused by low temperature, icing and micro-deformation are effectively overcome; and finally, through task cooperative dynamic energy consumption management and self-adaptive flow channel adjustment based on upstream deposition perception, long-term continuous, intelligent and reliable operation of the whole system under the conditions of limited energy and harsh environment is ensured. According to the invention, full-chain optimization from stable structure and accurate sensing to system self-adaption is realized, and the precision and reliability of runoff sediment automatic monitoring in the alpine region are obviously improved.

A camera tracking system receives patient reference tracking information indicating pose of a patient reference array tracked by a patient tracking camera relative to a patient reference frame. A local XR headset view pose transform is determined between a local XR headset reference frame and the patient reference frame. Remote reference tracking information is received indicating pose of a remote reference array tracked by a remote reference tracking camera. A remote XR headset view pose transform is determined between a remote XR headset reference frame of a remote XR headset and the remote reference array. A 3D computer image is transformed from a local pose determined using the local XR headset view pose transform to a remote pose determined using the remote XR headset view pose transform. The transformed 3D computer image is provided to the remote XR headset for display with the remote pose relative to the remote XR headset reference frame.

The present invention provides a target track simulation method, device and medium based on an array antenna, comprising the following steps: S1, obtaining track data provided by a current user; S2, selecting an array element from each array element of the current array antenna as the center of mass of a flight platform, and using the array element as a reference array element to obtain the reference array element and other array elements of the current array antenna; S3, performing coordinate calculation on the geographical location and attitude information of the flight platform at several movement moments based on the center of mass of the flight platform, and obtaining the coordinates of other array elements in a preset coordinate system at several movement moments; S4, obtaining the coordinates of the target in the preset coordinate system based on the geographical location of the target; S5, performing distance calculation based on the coordinates of other array elements in the preset coordinate system at several movement moments and the coordinates of the target in the preset coordinate system, and obtaining the time delay difference between the reference array element and other array elements; S6, simulating the echo signal of the target based on the time delay difference between the reference array element and other array elements.

According to the memory and the control method thereof provided by the invention, the memory comprises a reading circuit and a memory array, the memory array comprises memory units and at least one row of reference units parallel to the memory units, and the reference units comprise first reference switch tubes with the same number as memory switch tubes in the memory units; the reading circuit comprises a sensitive amplifier and a reference array unit, the data input end of the sensitive amplifier is electrically connected with the bit line of the storage unit through a data switch tube, and the reference input end of the sensitive amplifier is electrically connected with the output end of the reference array unit. And the input end of the reference array unit is electrically connected with the reference lines connected with all the reference units through a second reference switch tube. According to the invention, parasitic influence and electric leakage influence can be counteracted, so that errors at two ends of data of the sensitive amplifier are reduced, and the reading accuracy is improved.

The invention discloses a memory reference array repairing method, a memory reference array repairing device and a medium, relates to the technical field of memories, is used for repairing a memory failure reference array, and provides the memory reference array repairing method aiming at the problem that a scheme for repairing the failure reference array is lacked at present. Address information of a reference array is pre-configured in a register in advance, so that when the resistance state of a memory is overturned due to sudden high temperature, a magnetic field, vibration and the like in an external environment, high resistance state writing can be carried out on a full address of the reference array through the pre-configured address information of the reference array; and the repair work of the failed reference array is realized. When the resistance state of the reference array using the MTJ bit is overturned due to the influence of external factors such as sudden high temperature, magnetic field and vibration, the full-address high-resistance state of the reference array can be recovered through rewriting operation, and the requirement of memory resistance value reference in a scene with temperature change is better met.

A method for encoding comprising: obtaining (700) a target block; obtaining a neighbor template of samples in a reconstructed neighborhood of the target block, a width of the neighbor template being based (701, 702, 703) on a height of the target block and a height of the neighbor template being based (704, 706, 705) on a width of the target block; determining a predictor block for the target block based on a minimization of a distortion between a prediction of the neighbor template from a reference array of samples in a reconstructed neighborhood of the neighbor template and the neighbor template.

The present application belongs to the technical field of mechanical arm control, and particularly provides a mechanical arm registration method, device, system and storage medium, the method is applied to the controller in the mechanical arm registration system, the controller is connected with the mechanical arm, the free end of the mechanical arm is connected with the flange, the flange is connected with the connecting block, three verification points are arranged on the connecting block, the connecting line of the three verification points is in triangular structure, the verification points are matched with the optical probe tip; the optical probe tip is defined with a probe coordinate system, the probe coordinate system can be recognized by a positioning camera, and one side of the end of the mechanical arm is provided with a mechanical arm end reference array which can be recognized by the positioning camera. The three verification points arranged on the connecting block are matched with the optical probe to collect the position of the verification point, the conversion matrix under multiple coordinate systems is transformed, so that the mechanical arm registration can be completed when the mechanical arm maintains the same pose, and the dependence of the mechanical arm registration on the free space is reduced.

The invention relates to a bone drill calibration method and device, a storage medium and electronic equipment, and relates to the technical field of bone drill calibration. The method comprises the following steps: acquiring a first direction vector of a to-be-assembled actual drill bit on a target bone drill under a drill bit tip coordinate system and a second direction vector of a calibrator rod in a target calibrator under a first reference array coordinate system; determining a first conversion matrix from the first reference array coordinate system to the drill bit tip coordinate system; determining a second conversion matrix from a second reference array coordinate system of the target bone drill to the first reference array coordinate system, wherein the second reference array coordinate system is a coordinate system corresponding to a reference array in a bone drill handle of the target bone drill; and according to the first conversion matrix and the second conversion matrix, determining a third conversion matrix from the second reference array coordinate system to the drill bit tip coordinate system. The method has the effect of improving the bone drill calibration accuracy.

The present application relates to registering surgical tools with reference arrays tracked by cameras of an extended reality headset for assisted navigation during surgery. The present invention discloses a camera tracking system for computer-assisted navigation during surgery. The camera tracking system is configured to identify a reference array tracked by a set of tracking cameras attached to an extended reality (XR) headset and determine whether the reference array is registered to be paired with a characteristic of one of a plurality of surgical tools defined in a surgical tool database. The camera tracking system is further configured to, based on the reference array being determined to be unregistered and receiving user input, register the reference array to be paired with a characteristic of one of the plurality of surgical tools selected based on the user input. The camera tracking system is further configured to provide a representation of the characteristic to a display device of the XR headset for display to a user.

The invention relates to a line coverage rate determination method and device, computer equipment, a storage medium and a computer program product. The method comprises the following steps: acquiring an execution array and a reference array corresponding to a target time period; the reference array is the same as an execution array corresponding to a previous adjacent time period of the target time period, and elements in the execution array represent execution conditions of byte code instructions corresponding to indexes of the elements; based on the execution array and the reference array, determining a target index corresponding to the newly executed byte code instruction in the target time period; based on an index table corresponding to the to-be-tested program and the target index, determining a target row identifier corresponding to a newly executed target source code row in the target time period; and determining a row coverage rate corresponding to the to-be-tested program based on the target row identifier. By adopting the method, the timeliness of determining the line coverage rate can be improved.

The invention discloses a design method of a broadband dual-polarization low-scattering array antenna, and belongs to the technical field of array antenna stealth design. According to the method, the radiation mode of the reference array antenna and the x-polarization and y-polarization broadband scattering modes are calculated and analyzed based on characteristic mode analysis, and then the design of the scattering cancellation unit / low scattering unit is given. And finally, in the co-polarization direction, array antenna co-polarization RCS reduction is realized through scattering cancellation unit array forming. In the cross polarization direction, array antenna cross polarization RCS reduction is achieved through low scattering unit array forming. Through the arrangement mode of the two polarization directions, a two-dimensional array antenna can be formed, and the two-dimensional array antenna is called as a broadband dual-polarization low-scattering array antenna. Therefore, the design of the broadband dual-polarization low-scattering array antenna is realized. The array antenna designed by the invention has the advantages of integration of radiation and scattering, wide band, dual polarization and low scattering, and can meet the stealth requirement.

The invention relates to the technical field of DRAM (Dynamic Random Access Memory) circuit design, in particular to a DRAM array circuit and module for reducing bit line coupling capacitance influence. The device comprises a target array, a reference array, an odd-row sensitive amplifier SAk, an even-row sensitive amplifier SAj, an odd-row pre-charging circuit PREk, an odd-row switch Sbl, k and an odd-row switch Sblb, k. According to the DRAM array circuit, bit lines of the DRAM array circuit are divided according to odd-even rows, and odd-even reading is realized by additionally arranging an additional pre-charging circuit for the odd-row bit lines and matching the odd-row bit lines with the odd-row sensitive amplifiers to be connected or disconnected; compared with traditional DRAM array reading, the odd-even reading has the advantages that the influence of DRAM array coupling capacitance can be greatly reduced, and the DRAM array reading result accuracy is remarkably improved. According to the DRAM array circuit, the problem that a traditional DRAM array circuit is greatly influenced by bit line coupling capacitance during reading is solved.

The application provides a method for analyzing steady-state direct current interference of an uncertain single interference source, which comprises simulation parameter setting, simulation calculation, extraction of a simulation reference pipe section, establishment of a reference array set, entry into analysis and judgment, extraction of a monitoring reference pipe section, establishment of a monitoring potential curve, establishment of a monitoring array set, correlation calculation and correlation judgment. Embodiments of the application utilize inherent potential distribution characteristics of steady-state direct current interference, simulate potential waveforms generated on a pipeline by different interference points at different distances from an interference source, intercept a part with unclear characteristics in the potential waveforms through extraction of a simulation reference pipe section, record a current potential waveform when a target pipe section appears abnormal interference, intercept a part with unclear characteristics in the potential waveforms through extraction of a monitoring reference pipe section, and determine whether the current abnormal interference is steady-state direct current interference through similarity between the potential waveform with characteristics in the abnormal state and the simulation characteristic potential waveform, so that identification of steady-state direct current interference is realized.

Dynamic reference arrays use markers and trackers to register a patient's anatomy to computer system. Wherein the dynamic reference array may be screwed into a patient's spinous process, clamped on to a spinous process, or attached to the spinous process using posts. In embodiments, a dynamic reference array may comprise a single structure comprising and attachment member and a scaffold. In alternate embodiments, the dynamic reference array may comprise distinct structures that allow the dynamic reference array to swivel and collapse in order to facilitate registration, while not interfering with a surgical procedure.

The invention relates to the technical field of underwater acoustic engineering, ocean engineering and sonar, in particular to a target detection method and system based on a deep-sea large-aperture vertical array. The method comprises the following steps: step 1, receiving a time domain signal radiated by a target sound source through a large-aperture vertical array laid in deep sea in a bottom-supported manner; 2, performing fast Fourier transform on the time domain signals received by each array element to obtain corresponding signal frequency spectrums; 3, calculating a steering vector according to the phase difference of the depth of each array element of the large-aperture vertical array relative to the reference array element; and based on the steering vector, processing the signal spectrums of different array elements through a spatial power spectrum estimation method to obtain spatial power spectrum estimation results at different angles of arrival so as to realize detection of a target sound source.