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165 results about "Coupling matrix" patented technology
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Isolating and purifying cells for therapy
ActiveUS20090186065A1Prevents unnecessary fluid lossImprove adhesionPeptide/protein ingredientsDialysis systemsBiological membraneBody fluid
The present invention provides methods and devices for isolating cells from a subject by circulating the subject's body fluid over an affinity moeity coupled matrix to isolate isolate cells from a subject either ex vivo or in vivo. One aspect of the invention is directed to connecting a subject to a system capable of circulating the subject's body fluid through an affinity moiety coupled matrix, such that the affinity moiety coupled matrix is capable of binding to and extracting target cells from the body fluid, and then eluting the target cells from the affinity moiety. Another aspect of the invention is directed to the apparatus for isolating cells from a subject, comprising a blood circulation system with an arterial side blood circuit for extracting blood and flowing the blood over an affinity moiety coupled matrix that binds to and extracts target cells and a venous side blood circuit for returning the blood to the patient. The invention is also directed to in vivo seeding of biomatrials by implanting the affinity moiety coupled matrix in a subject to attract and bind the target cells in vivo.
Owner:WAKE FOREST UNIV HEALTH SCI INC
Data relaying method for OFDM system and relaying station
InactiveCN101399799AImprove performanceSpatial transmit diversityTransmission control/equalisingData informationTransmitted power
The invention discloses a data relay method of an orthogonal frequency division multiplexing (OFDM) system which belongs to the wireless relay technical field of a wireless mobile communication system. A relay node in the method receives signals sent by a source node, caches the data information after OFDM demodulation, estimates the channel response of the link from the source node to a relay node, and then obtains the channel response of the link from the relay node to a destination node; a relay station determines the subcarrier coupling matrix in each subcarrier group according to the channel response of the links from the source node to the relay node and from the relay node to the destination node, and simultaneously estimates gain coefficient and transmitted power; and then the relay station maps the symbol on each subcarrier in the link from the cached source node to the relay node onto corresponding subcarrier in the link from the coupled relay node to the destination node according to the coupling relation of the subcarrier, allocates the power, then carries out the OFDM modulation and finally sends the symbol to the destination node. The invention improves the performance of the entire system.
Owner:ZTE CORP
Multi-source coupled integrated energy system planning method
InactiveCN107665377AOptimize site selectionOptimize constant volumeForecastingTechnology managementIntegrated energy systemEngineering
The invention relates to a multi-source coupled integrated energy system planning method. The method comprises steps that 1), an integrated energy system coupling model is established, and the coupling relationship among cold / heat / electrical / gas energy forms is described through listing mathematics coupling matrixes; 2), regional present situation analysis is carried out; 3), regional energy demand prediction is carried out; 4), energy supply equipment output analysis is carried out; and 5), energy station site selection and capacity setting are carried out, energy station site selection is reasonably determined, an energy station optimization planning target function and a constraint condition establishment solving model are determined, and the optimal energy station configuration capacity is acquired through solving the model. The method is advantaged in that on the condition that cold / heat load demands can be satisfied, site selection and capacity setting of a wind turbine generatorsystem, a photovoltaic electrical station, a gas turbine set and a ground source heat pump set are optimized, and bases are provided for planning and operation of an integrated energy system.
Owner:STATE GRID TIANJIN ELECTRIC POWER +1
Optimizing neighbor lists
InactiveUS20090264118A1Optimization mechanismImprove performanceWireless communicationGraphicsRadio channel
The present invention relates to a method of generating neighbor lists in a radio communication network comprising user terminals and base stations defining sectored or omnidirectional radio cells, where communication between user terminals and base stations is arranged to take place over radio channels. The method comprises the steps of: (a) receiving radio channel measurements from at least some of the user terminals; (b) creating a first table by using the measurements received from the user terminals, the first table comprising for at least some of the user terminals the corresponding radio channel measurement in relation to different radio cells; (c) processing the first table to generate a cell coupling matrix indicative of a radio coupling figure between different pairs of cells in the network; and (d) for a certain cell obtaining a neighbor list by determining the radio channel neighbors to be the cells of which the coupling figure with the cell in question is greater than a given threshold.
Owner:APPLE INC
IC with multi-mode antenna coupling matrix
An integrated circuit includes a first RF section, a second RF section, a baseband section, and an antenna coupling matrix. The antenna coupling matrix is coupled to: in a first mode, couple the first RF section to a first antenna structure and couple the second RF section to a second antenna structure; in a second mode, couple the first RF section to the first antenna structure and to the second antenna structure; and in a third mode, couple the second RF section to the first antenna structure and to the second antenna structure.
Owner:AVAGO TECH WIRELESS IP SINGAPORE PTE
Four-order cumulant sparse representation-based MIMO (multiple-input-multiple-output) radar direction of arrival estimation method under mutual coupling condition
InactiveCN105974366ASuppress color noiseImprove angular resolutionWave based measurement systemsRadar systemsMultiple input
The invention belongs to the monostatic MIMO (multiple-input-multiple-output) radar system technical field and relates to a four-order cumulant sparse representation-based MIMO (multiple-input-multiple-output) radar direction of arrival estimation method under a mutual coupling condition. The method of the invention comprises the following steps that: a transmitting array transmits mutually-orthogonal phase encoding signals, a receiving end carries out matched filtering on the phase encoding signals so as to obtain receiving data, and the influence of unknown mutual coupling is eliminated through linear transform based on the strap-shaped symmetric Toeplitz structures of the mutual coupling matrixes of the transmitting array and the receiving array; and a dimension reduction conversion matrix is constructed to carry out dimension reduction processing on mutual coupling-eliminated data, and a four-order cumulant matrix of a special form is constructed based on a new data matrix. According to the method of the invention, since the four-order cumulant technique and a weighted sparse representation framework are adopted, colored noises are successfully inhibited. The method of the invention can achieve accurate direction of arrival estimation under a Gaussian color noise condition, and has higher angular resolution and better angle estimation performance.
Owner:HARBIN ENG UNIV
Microwave filter assistant debugging method based on nuclear machine learning
ActiveCN101478069AEasy to adjustQuickly get adjustmentsElectronic circuit testingSpecial data processing applicationsElectricityHigh volume manufacturing
The invention discloses a microwave filter auxiliary debugging method based on kernel machine study, which mainly solves the problem that the prior art that does not construct a relationship model between the bolt adjustment amount and variable quantities of a coupling matrix. The method comprises the following steps: extracting the coupling matrix and processing data according to parameters of afilter S in engineering measurement to obtain normalized data sample sets of the bolt adjustment amount and the variable quantities of the coupling matrix; constructing the model of the influences ofthe bolt adjustment amount on the variable quantities of the coupling matrix by using the kernel machine study algorithm according to the sample sets; constructing an optimal adjustment model of the bolt adjustment amount of the filter according to the study model of the machine; and solving the optimal adjustment model to obtain the adjustment amount of each adjusting bolt of the filter. The method can rapidly and accurately carry out auxiliary debugging of the filter, and can be used for auxiliary debugging of mass-produced filters.
Owner:XIDIAN UNIV
Method of correcting various array errors in wave-reaching direction estimation
InactiveCN107037397AReduce mistakesReduce complexityRadio wave direction/deviation determination systemsDirection/deviation determining electromagnetic systemsError processingEstimation methods
The invention relates to an error estimation method in wave-reaching direction estimation and in particular to a method of correcting various array errors in wave-reaching direction estimation. In order to overcome the defects that the processing speed is relatively low and the complexity is relatively high as an existing array error processing method always corrects one error, the invention provides the method of correcting various array errors in wave-reaching direction estimation. The method comprises the following steps of: acquiring an amplitude and phase error matrix and a cross coupling array; obtaining a characteristic decomposition covariance matrix, a noise sub-spatial matrix and an estimation matrix according to a MUSIC algorithm; defining a spatial spectrum; searching for DOA estimation of N peak values in the spatial spectrum; solving an estimated value of an amplitude and phase inconsistency error matrix; solving an estimated value of the cross coupling matrix; calculating a cost function; giving a threshold, and if the difference between the adjacent iterated cost functions twice is greater than the threshold, performing continuous iteration; and if not, escaping circulation to obtain a to-be-estimated parameter. The method provided by the invention is suitable for estimating the wave-reaching direction in the presence of the array error.
Owner:HARBIN INST OF TECH
Multi-cell BDMA (beam division multiple access) transmission power allocation method
ActiveCN105933979AReduce distractionsIncrease profitHigh level techniquesWireless communicationComputation complexityTransmitted power
Owner:SOUTHEAST UNIV
Direct and integrated design method of band-pass filters
InactiveCN102708265AImproved group delay characteristicsThe method is simple, fast and accurateSpecial data processing applicationsTransmission zerosBand-pass filter
The invention discloses a direct and integrated design method of band-pass filters. In order to overcome the defect that the coupling matrix derived from the traditional integrated design method of the generalized Chebyshev single-pass-band or multi-pass-band band-pass filters is only narrow-band approximation and can not be used for integrated band-pass filters, the method is available for integrating the generalized Chebyshev single-pass-band or multi-pass-band band-pass filters in a band-pass domain directly, and improving the group delay characteristic in the pass band of the filter by introducing a plurality of transmission zeros. The direct and integrated design method can be used for extracting a network matrix of the generalized Chebyshev band-pass filters of the transmission zeros which have any bandwidth and are positioned at any frequency; and the derived network matrix has practical physical significance, while the network matrix derived from the traditional scheme can be taken as a low-pass narrow-band approximation result of the network matrix derived by using the method disclosed by the invention. The whole method disclosed by the invention has the advantages of simpleness, fastness and accuracy.
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA
Aeroelastic model using the principal shapes of modes (AMPS)
ActiveUS20090099796A1Reduce in quantityEasy to predictVehicle testingElectrical testingEngineeringBlade geometry
The Aeroelastic Model using the Principal Shapes of modes (AMPS) is a method used to predict flutter in gas turbine engines. Modern gas turbine engines often include rotors with flexible disks and / or significant blade geometry variations. The AMPS method accounts for the varying blade mode shapes associated with flexible disks as well as changing blade geometry, providing accurate flutter predictions for a large number of modes from a relatively small number of CFD (computational fluid dynamics) simulations. The AMPS method includes determining a smaller set of principal shapes that approximates a larger set of structural modes of interest. Using linear superposition, aerodynamic forces associated with the vibration of the principal shapes can be used to construct the full aerodynamic coupling matrix associated with the structural modes of interest. An eigenvalue equation is solved to determine a damping distribution associated with the structural modes of interest. The damping distribution is predictive of flutter.
Owner:RAYTHEON TECH CORP
Mutual coupling condition-oriented bistatic MIMO (multiple-input multiple-output) radar angle estimation method
ActiveCN107290730ARespond effectivelyReduce mutual coupling effectsRadio wave direction/deviation determination systemsComplex mathematical operationsComputation complexityArray element
The present invention discloses a mutual coupling condition-oriented bistatic MIMO (multiple-input multiple-output) radar angle estimation method. According to the method, radar data which have been subjected to matched filtering are expressed as a third-order tensor model by means of the multi-dimensional structure of array signals; since a uniform linear array mutual coupling matrix has a strip-shaped Toeplitz feature, the common scale conversion feature of a part of an array element directional matrix is utilized to eliminate the influence of mutual coupling; on the basis of a forward-backward smoothing technique and a unitary transformation technique, the augmented output trilinear model of decoupling-post data is constructed; and joint DOD (direction-of-departure) and DOA (direction-of-arrival) estimation is related with the trilinear model; and a target DOD and DOA are estimated through the least squares method. Compared with a traditional algorithm, the bistatic MIMO (multiple-input multiple-output) radar angle estimation method under the mutual coupling condition can effectively deal with situations where mutual coupling exists between a transmitting array and a receiving array, can automatically match the estimated DOD and DOA, and can reduce computational complexity by using a feature that trilinear decomposition only involves real number operation.
Owner:YANGTZE UNIVERSITY
Project recommendation method based on attribute coupled matrix decomposition
InactiveCN106294859AExact correlationAccurate hidden eigenvectorsData miningSpecial data processing applicationsPersonalizationFeature vector
The invention discloses a project recommendation method based on attribute coupled matrix decomposition. The method comprises steps as follows: firstly, giving attribute information of projects and calculating the similarity between the projects with a coupled object similarity measuring index; then learning conceal eigenvectors of users and the projects with a matrix decomposition algorithm, during learning of the conceal eigenvectors of the projects, constructing a regularized term by means of the attribute information of the projects, and constraining the execution process of matrix decomposition, so that the projects with similar attribute information have similar conceal eigenvectors; finally, according to the learned conceal eigenvectors of the users and the projects, projecting scores of projects which are not scored by the users by use of inner products of the conceal eigenvectors of the users and the predicts, and providing personalized project recommendation for the users according to the predicted scores. The problems of similarity calculation of the projects, cold start of project terminals and recommendation accuracy in a recommendation system are solved with the method.
Owner:INST OF BIG DATA RES AT YANCHENG OF NANJING UNIV OF POSTS & TELECOMM
A machine learning assisted large scale MIMO downlink user scheduling method
ActiveCN108990167AReduce complexityImprove performanceRadio transmissionWireless communicationFeature extractionGreedy algorithm
The invention discloses a large-scale MIMO downlink user scheduling method assisted by machine learning, which comprises the following steps: S1, a base station obtains a characteristic mode energy coupling matrix in a characteristic direction through an uplink detection signal sent by a user; S2, the base station calculates the sum rate under various user and beam combinations by using the eigenmode energy coupling matrix and the machine learning method; S3: the greedy algorithm is used to realize the user scheduling with the sum rate maximization criterion, and the optimal user beam pairingcombination is obtained. The invention obtains the statistical channel information through the uplink detection signal, and adopts the sum rate maximization criterion to carry out the user scheduling.Under the condition that the base station only has statistical channel information, the user scheduling complexity under large-scale antennas can be greatly reduced by the targeted feature extractionand the design of neural network, and the performance is close to the optimal, so the method has good applicability and robustness.
Owner:SOUTHEAST UNIV
Calibration method for six-dimension force sensor calibration device with medium measurement range
InactiveCN101571442AEasy to calculateQuick calculationForce/torque/work measurement apparatus calibration/testingBack stressEngineering
The invention relates to a calibration method for a six-dimension force sensor calibration device with medium measurement range. When in calibration, a rotary table handle is rotated, a rotary table turnplate drives an adapter plate, a six-dimension force sensor and a loading plate to rotate together, wherein the adapter plate, the six-dimension force sensor and the loading plate are arranged on the rotary table turnplate; the rotating angle is controlled by the rotary table handle and is read form scale on the rotary table turnplate; weights with different masses and numbers are respectively hung on a back stress-applying level, a front stress-applying level and a center stress-applying level of the loading plate through drop hangers so as to realize the independent loading and the compound loading of Fx, Fy, Fz, Mx, My and Mz of six force or moment componenets through the change of loading positions, a loading matrix and a corresponding output matrix of the six-dimension force sensor are obtained and are performed the decoupling computation to obtain a coupling matrix, i.e. the calibration of the six-dimension force sensor is completed. The invention has simple structure, convenient operation and high calibration precision, and is suitable to the calibration and the test of the six-dimension force sensor with medium measurement range.
Owner:ANHUI LONGCOM INTERNET OF THINGS
Self-adaption transmission method utilizing channel statistical information in multi-base station cooperative transmission system
ActiveCN101895911AApproximate the actual channelFast convergenceEnergy efficient ICTError preventionChannel state informationFrequency spectrum
The embodiment of the invention discloses a self-adaption transmission method utilizing channel statistical information in a multi-base station cooperative transmission system, comprising the following steps of: calculating the channel statistical information between each base station and a user by utilizing the results estimated by channels, wherein the channel statistical information includes a channel coupled matrix on a characteristic mode, a transmitting correlation matrix and a receiving signal to noise ratio and can be obtained at a receiving end; and carrying out combined power distribution and combined precoding transmission among the base stations by each base station at a transmitting end according to the channel statistical information fed back or hiddenly fed back by the receiving end. The self-adaption transmission method in the multi-base station cooperative transmission system in the invention can adjust transmitted parameters according to the statistical properties of the channels and improve the frequency spectrum utilization rate and the power efficiency of a communication system, and the obtained mutual information amount approaches to the capacities of the channels.
Owner:HUAWEI TECH CO LTD
Complex dynamic network modeling method and model controller design method
The invention discloses a complex dynamic network modeling method and a model controller design method. Modeling of a complex dynamic network is performed under the condition of random exchange of non-time-delay and time-delay coupling matrixes by applying the idea of robustness firstly, a novel partially time-delay dependent random spinning controller is designed and the problem of stabilization of the complex network system under the condition of random exchange of the coupling matrixes related to network topology is solved. The designed spinning controller is different from conventional controllers, the non-time-delay and time-delay state feedbacks of the spinning controller asynchronously occur at a certain probability. Corresponding sufficient conditions enabling the system to be stabilized are given and prevented in linear matrix inequalities under the effect of the designed controller based on the constructed complex network model. When the probability of random variables is unavailable, a self-adaptive partially time-delay dependent controller is provided for processing the situation.
Owner:LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY
Method for calibrating accelerometer under unsupported state
InactiveCN101907638ARealize unsupported calibrationAddressing Transgender IssuesTesting/calibration of speed/acceleration/shock measurement devicesAccelerometerLinear model
The invention discloses a method for calibrating an accelerometer under an unsupported state, which is applied to an inertial navigation system with the capacity of initially aligning with a static base attitude. The method comprises the following steps of: firstly, simplifying an error model, repeatedly changing the carrier position, and coarsely and finely aligning with each position by using the static base to acquire the attitude information; and calculating the three-axis component of an acceleration of gravity g projected under a carrier coordinate system according to the attitude information, and recording the measured value of the accelerometer at each position. The invention provides a 10-position calibrating scheme, which comprises the following steps of: acquiring zero offset to degenerate the error model into a linear model by identifying the zero offset through a nonlinear least square method according to the calculated value and measured value of the projected component; and mounting an error and scale factor coupled matrix by identifying through a linear least square method. Therefore, the key parameters of the accelerometer are calibrated. The method has the advantages of capacities of realizing unsupported calibration of the accelerometer and effectively estimating the key parameters of the accelerometer with time-varying performance, along with simple process and high speed.
Owner:BEIHANG UNIV
Blood purification adsorption agent for clearing immune body and preparation method thereof
The invention relates to a blood purification adsorbent which is used for eliminating antibody and the preparation method in the field of biomedical materials. The blood purification adsorbent comprises two parts of vector matrix and ligand, wherein, the ligand is fixed at the vector matrix by chemical coupling. The invention is characterized by taking benzoic acid molecular as the immobilized ligand of the blood purification adsorbent. The preparation method of the blood purification adsorbent takes cross-linking polysaccharide such as agarose, etc. as the vector matrix and prepares the adsorbent material by four steps of activation, arm hook, coupling matrix and post-processing. The invention has the advantages that: the invention can adsorb the antibody components in the plasma with high load; the invention has the adsorption limitation on nonspecific other plasma components such as serum albumin, etc.; the preparation cost is low; and the physicochemical properties are stable. The material can be used for eliminating the self antibody and the immune complex in the plasma as the adsorption filler of a blood purification device.
Owner:DALIAN UNIV OF TECH
Thermoelectric power generation device implemented on driving vehicles
InactiveCN102291057ADiffusion fastImprove heat transfer efficiencyGenerators/motorsEngineeringHeat sink
The invention discloses a thermoelectric power generation device implemented on a driving vehicle, which comprises a device body, a thermoelectric power generation chip assembly installed on the device body, a radiator and a heat pipe, and a heat collector between the high temperature end of the thermoelectric power generation chip component and the device body The low temperature end is connected with the heat dissipation end of the device body. The radiator is composed of a number of heat dissipation fins fixed at one end and a tube surrounding the heat dissipation fins. At the heat dissipation end of the device body, the condensation section is fixedly connected with the heat dissipation fin base. The invention adopts the advanced heat pipe heat dissipation technology, skillfully utilizes the high-speed natural cold wind generated by the vehicle to dissipate heat, has the characteristics of good heat dissipation performance, high thermoelectric conversion efficiency, reasonable structure design, good installation adaptability, convenient disassembly, maintenance and repair, and can Use vehicle engine exhaust gas, hot air in the cabin, high temperature on the roof in summer, etc. to generate temperature difference power generation.
Owner:赵蒙
Frequency diverse array based mutual coupling array DOA estimation method
ActiveCN110109051AImprove performanceImprove angle measurement accuracyRadio wave direction/deviation determination systemsHigh level techniquesSingular value decompositionRadar
Owner:TIANJIN UNIV
Method, device and storage device for extracting coupling matrix based on parameter optimization
ActiveCN109063374AReduce the numberSimple calculationDesign optimisation/simulationSpecial data processing applicationsMicrowave cavityAlgorithm
The invention provides a coupling matrix extraction method based on parameter optimization, device and storage device, by acquiring dissipative parameters of microwave cavity filter, calculating and removing phase offset difference of dissipative parameters, extracting polynomial coefficients E, P, F of dissipative parameters by Cauchy method, obtaining coupling matrix M of current state by generalized Chebyshev synthesis design method, and obtaining response parameter Sext; From the response parameter Sext and the dissipation parameter, the optimization objective function G is determined. Minimizing an optimization objective function G, and obtaining an optimization variable epsilon 0 corresponding to the smallest amount of G; The polynomial coefficients are synthesized with the obtainedoptimization variables, and the final coupling matrix M0 is obtained. The invention relates to a coupling matrix extracting device and a storage device based on parameter optimization, which are usedfor realizing a coupling matrix extracting method based on parameter optimization. The invention has the advantages that the number of variables for solving the phase offset and the number of optimization variables are reduced, and the invention plays an active role in the debugging of the microwave filter.
Owner:CHINA UNIV OF GEOSCIENCES (WUHAN)
Realization method of self-equalized multiple passband filter
InactiveUS20070005308A1Digital technique networkComputation using non-denominational number representationComputer sciencePassband filter
A realization method of a multiple passband filter that equalizes a group delay without using an external equalizer is disclosed. The realization method includes the steps of: a) calculating a transfer function based on poles and zeros; b) extracting an input / output coupling coefficient and a coupling matrix from the calculated transfer function as a network parameter; and c) physically designing and realizing elements of the filter to have the extracted network parameter.
Owner:ELECTRONICS & TELECOMM RES INST
Method for analyzing dynamics of aviation multi-rotor coupling system
InactiveCN102201033AAccurate descriptionHigh precisionMachine gearing/transmission testingEngine testingAviationFinite element method
The invention discloses a method for analyzing dynamics of an aviation multi-rotor coupling system, and belongs to the field of rotor dynamics. By means of an idea of finite element method to solve problems, the method comprises the following steps: separating the aviation multi-rotor coupling system at coupling parts to form independent rotors; taking each rotor as a unit, and taking the coupling force of each coupling part as an external force of the unit of the coupling part to obtain a dynamic differential equation of each unit; analyzing the coupling force of each coupling part ob acquire a coupling matrix and an equation of the coupling force; and leading the dynamic differential equation of each unit and the equation of the coupling force of each unit to be simultaneous to obtain a dynamic differential equation of the aviation multi-rotor coupling system, and solving to acquire the dynamic characteristics of the aviation multi-rotor coupling system. The method is clear in thread, simple and standard in expression, and suitable for analysis on dynamics of the aviation multi-rotor coupling system, can accurately describe the coupling parts, and improves the accuracy of calculation results.
Owner:NORTHWESTERN POLYTECHNICAL UNIV
Magnetic-resonance radio-frequency coil performance evaluation method and system
ActiveCN103698732AEvaluation is convenient and fastSave human effortElectrical measurementsEngineeringMaterial resources
The invention relates to a magnetic-resonance radio-frequency coil performance evaluation method, which comprises the steps of establishing a magnetic-resonance multi-channel radio-frequency coil model and starting the multi-channel radio-frequency coil model to produce an excited magnetic field; loading a digital human model in the multi-channel radio-frequency coil model; calculating the electromagnetic field of each coil channel in the multi-channel radio-frequency coil model when the digital human model is loaded; calculating the coil sensitivity of the multi-channel radio-frequency coil model according to the magnetic field of each coil channel; calculating the noise coupling matrix of the multi-channel radio-frequency coil model according to an electric field produced by each coil channel; calculating the signal-to-noise ratio of the multi-channel radio-frequency coil model according to the coil sensitivity and the noise coupling matrix. The magnetic-resonance radio-frequency coil performance evaluation method has the advantages that the actual measurement environment is not required to be established, the performance of magnetic-resonance radio-frequency coils can be conveniently and quickly evaluated and the manpower and the material resources are saved. Moreover, the invention additionally provides a magnetic-resonance radio-frequency coil performance evaluation system.
Owner:SHANGHAI UNITED IMAGING HEALTHCARE
Method of improving multichannel radio frequency coil performances
ActiveCN105572612AImprove performanceImprove signal-to-noise ratioMeasurements using NMR imaging systemsCoilsSignal-to-noise ratio (imaging)Imaging quality
Provided is a method of improving multichannel radio frequency coil performances, comprising the steps of: before magnetic resonance scanning, adding a magnetic meta-material into a multichannel radio frequency coil; under the condition of no radio frequency emission power, collecting the noise of each channel in the multichannel radio frequency coil; calculating the noise coupling matrix of the multichannel radio frequency coil after adding the magnetic meta-material; and in an image reconstruction process, employing the noise coupling matrix to compensate for the coupling of the multichannel radio frequency coil. The method collects the noise of each channel of the multichannel radio frequency coil, calculates the noise coupling matrix thereof, and employs the noise coupling matrix to compensate for the coupling deterioration of the multichannel radio frequency coil in image reconstruction, thereby improving multichannel radio frequency coil performances when the magnetic meta-material is added into the multichannel radio frequency coil, increasing an image signal to noise ratio and a resolution ratio, and improving image quality.
Owner:SHENZHEN INST OF ADVANCED TECH CHINESE ACAD OF SCI
Array antenna single-point mutual decoupling correction method
ActiveCN102208932ASmall amount of calculationTransmitters monitoringSpatial transmit diversitySignal sourceCorrection method
The invention discloses an array antenna single-point mutual decoupling correction method, which relates to a large array antenna mutual coupling correction technology and is particularly applied to a one-dimensional uniform linear array and a uniform round array. The method comprises the following steps of: arranging a correction signal source for transmitting signals at any direction in a far field, and measuring an incident angle of the correction signal source to a normal direction of an antenna array; transmitting the signal by using the correction signal source, and measuring the output response of each antenna array element; performing simplified transform on a mutual coupling matrix; constructing a cost function, calculating an extremum of the cost function, and obtaining a mutual coupling matrix coefficient; and inversing the mutual coupling matrix, and substituting an inverse matrix coefficient of the mutual coupling matrix into each channel, thereby realizing array antenna single-point mutual decoupling correction. The method has the advantages that: the method is simply implemented, convenient to operate, low in calculated amount and particularly applied to the large array antenna mutual coupling correction of the one-dimensional uniform linear array and the uniform round array; and only the single point response of the antenna array in any direction is required to be measured, and the measurement of the whole directional diagram of an array antenna is not required.
Owner:NO 54 INST OF CHINA ELECTRONICS SCI & TECH GRP
Self-correcting method for mutual coupling errors of MIMO radar receiving and transmitting arrays
ActiveCN106443610ASolve the problem of large sample demandRealize self-calibrationWave based measurement systemsCovarianceCorrection method
The invention provides a self-correcting method for mutual coupling errors of MIMO radar receiving and transmitting arrays, and mainly solves the problems that when mutual coupling errors of the receiving and transmitting arrays are corrected by the traditional method, a large number of samples are required, and transmitting mutual coupling errors cannot be corrected in real time in an online manner. According to the technical scheme, the self-correcting method comprises the following steps: 1, carrying out pulse compression on MIMO radar echo data to obtain a data matrix Y; 2, constructing a pseudo-covariance R by using a spatial smoothing algorithm; 3, estimating strong clutter azimuth information according to the pseudo-covariance R; 4, constructing a cost function by using the data matrix Y and the strong clutter azimuth information, and calculating a receiving mutual coupling error matrix Cr through the cost function to estimate receiving mutual coupling errors; and 5, solving a transmitting mutual coupling error matrix Ct by using the receiving mutual coupling matrix Cr to estimate the transmitting mutual coupling errors. Single snapshot echo data of an MIMO radar are used, mutual coupling errors of the receiving and transmitting arrays can be accurately estimated respectively, therefore, self-correcting of the receiving and transmitting mutual coupling arrays is realized, and the self-correcting method can be used for improving the detecting performance of the MIMO radar.
Owner:XIDIAN UNIV
Color object three-dimensional profile measurement method
The invention belongs to the technical field of optical measurement, and specifically relates to a color object three-dimensional profile measurement method. According to the invention, a three-channel coupling matrix of a 3CCD camera is measured by a photometer, then the influence of a physical device on the measurement process is eliminated, and the precision is higher than that of a process ofprojecting red, green and blue images onto white paper and calculating the coupling matrix; and the surface albedo of the color object is worked out, and such process is substantially equivalent to projecting three-primary colors onto each point of the object, and complementary colors are overlapped based on the complementary relationship so that the obtained surface albedo matrix K offsets the interference. Compared with the reflectivity K obtained by projecting uniform white light, the process of projecting complementary color stripes can realize a better compensation effect on the structured light stripes, and the compensated image has better sine property. By adopting the method, the three-dimensional profile information of the color object can be obtained more accurately just by projecting four images to the surface of the color object while the measurement speed is also taken into consideration, and the aim of quick measurement can be achieved.
Owner:XI'AN INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
Automatic filter debugging device
InactiveCN107121601ARealize fully automatic debuggingImprove debugging efficiencyElectrical testingMotor controllerComputer science
The invention relates to an automatic filter debugging device comprising a vector network analyzer, a computer, and a motor controller. The vector network analyzer is connected with the output end of a target filter. The input end of the computer is connected with the output end of the vector network analyzer, and the output end of the computer is connected with the motor controller. The output end of the motor controller is connected with the target filter through a motor. The vector network analyzer is used for reading the S parameter of the target filter. The computer calculates a corresponding filter coupling matrix according to the S parameter, compares the coupling matrix with an ideal coupling matrix to get an error matrix, calculates the regulation quantity of the filter according to the error matrix, and sends the regulation quantity to the motor controller. The motor controller outputs a signal to debug the corresponding filter according to the regulation quantity. Full-automatic filter debugging is realized. The efficiency of filter debugging is improved greatly. The cost of personnel and equipment needed for traditional debugging is reduced. The consistency of products is ensured to the maximum.
Owner:苏州尚迈智能科技有限公司
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