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100 results about "Total least squares" patented technology
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In applied statistics, total least squares is a type of errors-in-variables regression, a least squares data modeling technique in which observational errors on both dependent and independent variables are taken into account. It is a generalization of Deming regression and also of orthogonal regression, and can be applied to both linear and non-linear models.
Automatic shoe sole edge line tracking method based on robot
InactiveCN104463851ASave human effortQuick scanImage enhancementImage analysisThree levelGeneration process
The invention provides an automatic shoe sole edge line tracking method based on a robot. The method includes the steps that firstly, a shoe with a shoe sole bound is scanned, after point cloud data are acquired, point cloud feature points are acquired through a weighted PCA three-level-set total least square method, the feature points are divided into blocks and projected to a two-dimensional region, a longest feature line in a two-dimensional image is acquired through a two-dimensional line segment splicing method, the feature line is back projected to three-dimensional space, a closed three-dimensional curve of the edge of the shoe sole is thinned through a space linear projection method, a new curve is generated through a scanned current vamp and the three-dimensional closed curve generated previously in the generation process, the curve is tracked through the industrial robot, and then automatic grinding, liquid medicine coating and glue spraying operation and the like can be achieved. The method can be widely applied to an automatic shoe-making system, and the production efficiency and product quality are improved.
Owner:HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
Method for estimating direction of arrival of radar low-elevation target
InactiveCN102012505AImprove signal-to-noise ratioSave huge amount of computationRadio wave reradiation/reflectionDistance samplingGeneralized eigenvalue decomposition
The invention discloses a method for estimating the direction of arrival of a radar low-elevation target, which mainly solves the problem of large calculation of the estimation of the direction of arrival of the low-elevation target in the prior art. The method comprises the following steps of: 1, transmitting a group of narrowband phase reference pulse signals with bandwidth of not exceeding 1 percent of carrier frequency; 2, receiving radar echo data by using a uniform line array; 3, carrying out beam forming on the radar echo data, wherein the beam points 0 degree; 4, measuring a distance sampling unit and a Doppler channel in which a target is disposed; 5, re-accumulating the received radar echo data according to the obtained distance sampling unit and the Doppler channel; 6, constructing a matrix beam by using the re-accumulated data; and 7, solving the direction of arrival of the target for the constructed matrix beam by adopting a total least square method of generalized eigenvalue decomposition.
Owner:XIDIAN UNIV
Two-step positioning method of wireless sensor network based on total least squares
ActiveCN103338516AReduce volumeReduce power consumptionNetwork topologiesAlgorithmTotal least squares
The invention discloses a two-step positioning method of a wireless sensor network based on total least squares, and belongs to the technical field of signal processing. According to the method, a fitting model parameter obtaining module, a distance estimation module and a position positioning module are adopted, the fitting model parameter obtaining module serves the distance estimation module and the position positioning module, the relative distance between a reference node in a practical environment and the terminal and the corresponding RSS (received signal strength) value are collected in advance in real time, and the relative distance and the RSS value are subjected to relationship curve model fitting training to obtain model parameters; the distance estimation module utilizes the real-time collected RSS value for carrying out distance estimation according to the parameters obtained through fitting model training, and different model parameters are selected for estimation according to the RSS value; and the distance obtained by the distance estimation module and the reference node coordinate are used as the input of the position positioning module, and the output of the position positioning module is the estimation value of unknown node coordinates.
Owner:DALIAN UNIV OF TECH
Combined DOA and TOA single-station passive positioning method based on error correction
ActiveCN108717184AImprove targeting performanceGuaranteed estimated performanceRadio wave reradiation/reflectionLocation statusRadar systems
The invention discloses a combined DOA and TOA single-station passive positioning method based on error correction. According to measurement information obtained by a receiving station of an externalradiation source radar system, by introducing an auxiliary variable, a nonlinear equation is converted into a pseudo-linear equation, a pseudo-linear model between the state of a target position and the state of an observation station position is established, an iterative least square method is adopted for estimation, a constrained total least square estimation model is constructed, a constrainedoptimization problem is converted into an unconstrained optimization problem, a Newton iteration method is used for optimization and solution, and the correlation between the auxiliary variable and the target position is used for constructing a correlation least square estimation model, so that the target positioning performance is further improved. The target positioning accuracy is improved through combined estimation of the target position and system errors. Convenience is provided for improving the target positioning performance, the complexity of error registration under the premise of ensuring the estimation performance is reduced, and good positioning performance in the case of large measurement noise is achieved.
Owner:HANGZHOU DIANZI UNIV
High dynamic range image fusion method used for overcoming influence of dynamic problem
ActiveCN105933617AAvoid difficultiesSmall amount of calculationTelevision system detailsColor television detailsCamera response functionTotal least squares
The invention discloses a high dynamic range image fusion method used for overcoming influence of a dynamic problem for overcoming a problem of high dynamic range image fusion which is influenced by dynamism of a shot scene and shake of an imaging system. A method for calibrating a camera response function based on a brightness mapping function is adopted to overcome the influence of the dynamic problem on calibration of the camera response function, and then a total least square method is combined to introduce a correction matrix to carry out combined compensation on an error, so that the camera response function of the imaging system can be obtained without high-precision image registration; through analyzing a feature selection weighting function of a multi-exposure image sequence, the calibrated camera response function is combined to construct a high dynamic range image weight fusion function, and the input multi-exposure image sequence is utilized to obtain a high dynamic range image fusion effect. The method can overcome difficulties which are brought to calibration of the camera response function by the dynamic problem, so that the adaptability of a multi-exposure high dynamic range fusion technology is improved.
Owner:PLA PEOPLES LIBERATION ARMY OF CHINA STRATEGIC SUPPORT FORCE AEROSPACE ENG UNIV
Non-parallel track compensation method of distributed satellite SAR (Synthetic Aperture Radar) system
InactiveCN102073036AOvercoming the effects of measurement errorImprove relevanceRadio wave reradiation/reflectionSynthetic aperture sonarVelocity measurement
The invention discloses a non-parallel track compensation method of a distributed satellite SAR (Synthetic Aperture Radar) system, mainly solving the problems on non-parallel track compensation and along-track base line calculation of the distributed satellite SAR system. The implementation process of the non-parallel track compensation method of the distributed satellite SAR system comprises the following steps of: fitting the measurement data of an ephemeris position by adopting total least squares, to obtain a time parameter equation of a satellite track within an imaging time slot; resampling a track position to obtain a track position coordinate of the impulse transmission time of each direction; structuring a time parameter equation of a new concomitant satellite track parallel to a primary satellite track; compensating concomitant satellite echo data to obtain echoes equivalent to the echoes received along the new concomitant satellite track parallel to the primary satellite track; and calculating the length of the along-track base line. By means of the non-parallel track compensation method provided by the invention, the influence of measurement errors of a GPS (Global Position System) with short-range dependence can be overcome by fitting the measurement data of the ephemeris position, an image pair with higher dependence can be provided for GMTI (Ground Moving Target Indication) clutter suppression and the accurate along-track base line can be provided for the velocity measurement and the positioning of a moving target.
Owner:XIDIAN UNIV
High-voltage direct-current power transmission multi-channel supplementary damping control method based on variable structure
InactiveCN104022524ASuppress low frequency oscillationSuppression of subsynchronous oscillationsElectric power transfer ac networkPower oscillations reduction/preventionHigh-voltage direct currentOperability
The invention discloses a high-voltage direct-current power transmission multi-channel supplementary damping control method based on a variable structure. The high-voltage direct-current power transmission multi-channel supplementary damping control method has the characteristics that sub-synchronous and low frequency oscillation frequencies and damps, and a system reduced-order model are identified by a TLS-ESPRIT (Total Least Squares-Estimation of Signal Parameters via Rotational Invariance Techniques) algorithm with high operation efficiency and anti-interference capability; a variable structure control principle is combined and an attached controller containing a virtual state variable is designed; finally, a state observer is led in to eliminate the virtual state variable so as to realize an HVDC (High Voltage Direct Current) variable structure controller with an output feedback form; then a variable structure control theory is used for designing a multi-channel direct-current attached damping controller so as to reduce the mutual influences between oscillation modes; the sub-synchronous and low frequency oscillation can be inhibited synchronously. The method is efficient and feasible; the variable structure control theory has strong disturbance rejection on complicated changeable working conditions of an actual power grid; meanwhile, a multi-channel structure is utilized by using the controller to solve a coordinated control problem among the plurality of controllers; the invention provides a controller design method of an actual large power grid with very strong operability.
Owner:SICHUAN UNIV +3
Panoramagram generation method and system based on characteristic matching
InactiveCN101394573AFast and accurate matching relationshipGenerate accuratelyCharacter and pattern recognitionSteroscopic systemsTotal least squaresNear neighbor
The invention provides a panorama generation method based on character matching and a system. The method comprises the following steps: characteristic points of an image A and an image B which are adjacent are extracted, vector parameters of the characteristic points are established, and coordinates of the characteristic points are determined; the characteristic points of the image A are used as a sample, the characteristic points of the characteristic points are classified, and the characteristic points which are the best matching with the sample in the image A are selected out from each classification of the image B; a relational expression for the image A to be converted to be under the coordinate system of the image B is calculated by utilizing the matching relations of the characteristic points, and the image A is converted to be under the coordinate system of the image B according to the relational expression; and the image A and the image B are spliced to form an image A1. The panorama generation method and the system use a nearest neighbor method training classifier to match the characteristic points, and obtain a conversion relational-expression with high accuracy through a total least square method, thereby generating a panorama rapidly and accurately.
Owner:广东清立方科技有限公司
Method for extracting road alignment parameters
InactiveCN103310699AAccurate descriptionLinear parameter optimizationInstruments for road network navigationMaps/plans/chartsData setTotal least squares
The embodiment of the invention provides a method for extracting road alignment parameters. The method is applied to a navigation unit and comprises the steps of: step 1, linearly detecting a road axis coordinate to obtain preliminary road alignment units by adopting a conversion between an image space and a parameter space; step 2, utilizing a mixing method of a least square and a total least square to carry out adjustment on the preliminary road alignment units so as to obtain linear parameters; step 3, circularly executing forward and backward extension and adjustment on the linear parameters until the linear parameters are divided into corresponding data sets; and step 4, utilizing a condition adjustment with parameters to carry out overall adjustment on the linear parameters in the data sets so as to obtain the optimized linear parameters according with preset conditions; and adopting the optimized linear parameters to describe road conditions in a navigation electronic map. The road conditions can be accurately described on the navigation electronic map through the optimized linear parameters.
Owner:NAVINFO
Method for directly correcting and compensating course angle of navigation system
The invention discloses a method for directly correcting and compensating a course angle of a navigation system and belongs to the technical field of location of navigation systems. The method for directly correcting and compensating the course angle of the navigation system comprises the following steps: firstly expanding an error model of a magnetometer according to the basic principle of circulating the course angle by virtue of the magnetometer; secondarily obtaining a parameter estimation model according to distribution characteristics of an earth magnetic field; finally estimating parameters of the expanded error model of the magnetometer by using a two-step total least square method so as to directly correct the course angle of the navigation system at a system level. The method can be used for correcting and compensating the error of a course angle of an inertial integrated navigation and location system which comprises an inertia measurement unit (IMU) and the magnetometer (or an electronic compass). The method is capable of directly correcting the course angle of the navigation system, strong in robustness, strong in reliability, low in cost, high in accuracy, simple in calculation process, and capable of achieving high-accuracy location and navigation and achieving good effects.
Owner:SOUTHEAST UNIV
Multi-harmonic-source harmonic contribution quantitative analysis method based on total-least square method
ActiveCN106443285AOvercome errorThe result is accurateData processing applicationsElectrical testingTotal least squaresSingular value decomposition method
The invention discloses a multi-harmonic-source harmonic contribution quantitative analysis method based on a total-least square method. The multi-harmonic-source harmonic contribution quantitative analysis method includes: selecting harmonic voltage as the index for evaluating harmonic contribution, and determining the joint action of the harmonic source of each node; sectioning measured data according to time, and calculating the harmonic contribution in each time section according to the projection of the harmonic voltage of one harmonic source at one node on the total harmonic voltage at the node; using the total-least square method to solve harmonic impedance and the harmonic voltage, namely background harmonic voltage, of other harmonic sources at the node, and using a singular value decomposition method to obtain the solution of the total-least square method to obtain the quantitative data of each harmonic source at each node at each harmonic time. The multi-harmonic-source harmonic contribution quantitative analysis method has the advantages that the total-least square method is applied to the harmonic quantitative analysis field, the defect that a traditional method only considers variable harmonic voltage measuring errors and does not consider the independent variable harmonic current measuring errors is overcome, and obtained results are accurate.
Owner:UNIV OF JINAN
Low frequency oscillation online identification method based on cross-correlation function denoising algorithm
InactiveCN103944174AImprove operation accuracyFast convergenceElectrical testingPower oscillations reduction/preventionDiagnostic Radiology ModalityPattern recognition
The invention discloses a low frequency oscillation online identification method based on a cross-correlation function denoising algorithm. The low frequency oscillation online identification method based on the cross-correlation function denoising algorithm is characterized in that cross-correlation functions are used for replacing actual measured signals to restrain color noise, and modal identification of low frequency oscillation is carried out by combining a total least square-rotation invariant technology parameter estimation (TLS-ESPRIT) algorithm. The algorithm can identify the modality of the low frequency oscillation of a power system under a color noise environment quickly and accurately, and an effective basis is provided for security and stability analysis and restraining measures of a system.
Owner:SICHUAN UNIV +3
Vanishing point based method for automatically extracting and classifying ground movement measurement image line segments
InactiveCN101915570AAutomatic extractionAccurate extractionPicture interpretationHough transformTotal least squares
The invention relates to a vanishing point based method for automatically extracting and classifying ground movement measurement image line segments. The method comprises the following steps of: firstly, analyzing the attribute of ground object space parallel characteristic lines of a target and calculating vanishing points of an image of the target on the basis of image sequences acquired by ground movement measurement; secondly, extracting characteristic line segments based on an image edge according to the Hough transform of a polar coordinate parameter area extremum and the continuous change of image greyscale; and then, classifying the extracted plane line segments by using vanishing points; and finally integrating the classified line segments according to a total least square method and conditions of the plane adjacency and overlapping degree of the line segments so as to extract image characteristic line segments which correspond to multiple ground object space parallel lines. The invention can improve the indoor processing capability of a movement measurement system and promote the research on automatic recognition, mapping, three-dimensional reconstruction and the like of multiple ground objects (such as buildings, roads and the like).
Owner:TONGJI UNIV
Monitoring method for determining influence of speed regulating system on low-frequency oscillation damping
ActiveCN104330667AGood vibration dampingOscillation quickly subsidesDynamo-electric machine testingTotal least squaresDamping ratio
The invention discloses a monitoring recognizing method for determining the influence of a speed regulating system of a prime motor on low-frequency oscillation, and aims at recognizing whether a positive damping or a negative damping is provided by the speed regulating system of the prime motor for oscillating during the oscillating process in order to provide a certain reference value for the stable operation of a power system. The method comprises the following steps: recognizing the oscillation damping by the TLS-ESPRIT (total least squares-estimation of signal parameters via rotational invariance techniques) method; determining a first included angle of the left and right variables of a motor rotor equation based on the damping ratio; measuring the local electromagnetic power and the rotating speed of a generator to obtain a second included angle between the rotating speed deviation and the active power deviation; comparing the two included angles to determine whether the positive damping or the negative damping is provided by the mechanical power deviation to the oscillation. The determining method is simple and efficient and assists an operator improving the stabilizing level of the power system.
Owner:CENT CHINA GRID +1
Remote-sensing image relative correction method and system integrating geometry and radiation
ActiveCN104050643ARealize integrationImprove calibration accuracyImage enhancementMaterial analysis using microwave meansImage calibrationTotal least squares
The invention discloses a remote-sensing image relative correction method and system integrating geometry and radiation. The method includes the steps of generating a control point on an image by means of combination of automatic matching and gross error detection, calculating an initial value of a geometry correction coefficient, detecting radiation invariant of the image to be corrected, calculating the initial value of a radiation correction coefficient, putting a geometric correction model into a linear radiation correction equation, building an error equation integrating geometry and radiation coefficients, calculating a correction coefficient by means of a weighing total least square method, solving the error equation to obtain a correction coefficient modification value and iterating and optimizing the correction coefficient modification value. According to the method, the geometry coefficient and the radiation coefficient in image correction can be calculated simultaneously, and the method lives up to the objective law, is scientific and can further improve correction precision.
Owner:HUAZHONG NORMAL UNIV
Fast registration method of 3D point cloud data with color information
ActiveCN107346550AImprove registration efficiencyShorten registration timeImage analysisPoint cloudTotal least squares
The invention discloses a fast registration method of 3D point cloud data with color information. The method comprises a step of counting color values in a target point set and a registration point set and the quantity distribution of points with a same color and filtering the color of RGB point cloud, a step of screening points with a same RGB value in two point sets and then setting a certain color tolerance for the registration point set, a step of extracting four initial points from one point selected in the target point set in each time, constructing a candidate point set similar to the characteristics of the four initial points in the registration point set, and judging whether the candidate point set is same name points of the four initial points, a step of allowing the four initial points and the corresponding four same name points to form four point pairs, using a total least square algorithm to calculate a rigid transform matrix, and completing the global registration of the registration point set, and a step of using a neighboring point iteration method to complete a final local registration finally. According to the method of the invention, the efficiency of point cloud registration can be greatly improved under the premise of maintaining high precision, and the registration time is shortened.
Owner:CHUZHOU UNIV
Bumpy platform SAR three-dimensional motion error estimation method
ActiveCN110146857AFocusOvercoming the inability to compensate for space-varying phase errorsRadio wave reradiation/reflectionImaging qualityEstimation methods
Owner:XIDIAN UNIV
Passive radar target positioning method and device
ActiveCN108761399AGuaranteed convergenceSolve the problem of low accuracy in estimating the target positionRadio wave reradiation/reflectionPassive radarAlgebraic solution
The invention relates to a passive radar target positioning method and device. The method comprises steps of linearizing an observation equation of angle and time difference to obtain a set of linearequations, obtaining rough estimation of a target position by using least squares, considering the observation error and the position error of the external radiation source in the linear equations toobtain a constrained total least squares model, taking a least squares solution obtained as an initial solution, and using the Newton iteration to obtain the accurate estimation of the target position. The invention considers the angle observation error, the time difference observation error and the position error of the external radiation source, the positioning result is the optimal estimation result when the external radiation source has an error, and the nonlinear angle and time difference observation equation is linearized to obtain the least squares algebraic solution as the initial solution of the Newton iteration to ensure the convergence of the algorithm.
Owner:PLA STRATEGIC SUPPORT FORCE INFORMATION ENG UNIV PLA SSF IEU
Method for frequency estimation of non-equilibrium power system
ActiveCN106680583AImprove robustnessFast convergenceFrequency to amplitude conversionVoltage amplitudeComputation complexity
The invention discloses a method for frequency estimation of a non-equilibrium three-phase power system. The method comprises the steps that the frequency of the non-equilibrium three-phase power system is estimated mainly on the basis of a widely-linear total least square self-adaption algorithm model, wherein the widely-linear model sufficiently utilizes three-phase voltage complete two-order information, and the frequency estimation robustness is enhanced. Compared with traditional linear self-adaptation estimation, the method is more applicable to the non-equilibrium system, and unbiased frequency estimation is given. Meanwhile, the model is not sensitive to changes of the three-phase voltage amplitude along with time passage and higher harmonic. The method is more stable and low in computation complexity, and the convergence performance, robust anti-noise performance and stable convergence precision are obviously improved.
Owner:SOUTHEAST UNIV
High resolution seismic wavelet extracting method based on high-order statistics and ARMA (autoregressive moving average) model
InactiveCN102768365AEfficient and accurate extractionSeismic signal processingMoving averageData simulation
The invention relates to a high resolution seismic wavelet extracting method based on high-order statistics and an ARMA (autoregressive moving average) model, which belongs to the field of seismic signal processing. The high resolution seismic wavelet extracting method provided by the invention is characterized in that: under the precondition of performing ARMA parameter simplified modeling on seismic wavelets, SVD (singular value decomposition) based on autocorrelation function is adopted to determine an order of AR part, an MA order determining method is provided for integrating information content criterion function in a high-order cumulant MA order determining method, and the MA order determining accuracy rate in a seismic wavelet ARMA model is improved; an SV-TLS (singular value decomposition - total least squares estimation) and a cumulant method are respectively adopted to estimate wavelet parameters; and under the precondition of ensuring wavelet precision, the model order is decreased as far as possible to improve the operation efficiency and to finally realize seismic wavelet extraction in high efficiency and high precision. Through the data simulation verification and the practical seismic data processing demonstration, the method provided by the invention is proved to effectively improve the estimated precision and extracting efficiency for the seismic wavelets and to have obvious effect even under short-time seismic data and strong noise pollution.
Owner:戴永寿 +2
Integrity monitoring based baseline deformation detection method
ActiveCN106772509AImplementation of deformation detectionSatellite radio beaconingTotal least squaresDependability
The invention belongs to the technical field of satellite precise navigation and positioning, and particularly relates to an integrity monitoring based baseline deformation detection method capable of improving the monitoring reliability of satellite navigation and positioning for baseline deformation. The integrity monitoring based baseline deformation detection method comprises the steps of 1, detecting baseline deformation according to integrity monitoring, analyzing multiple types of errors, and acquiring an optimal estimated value of a baseline solution by combining multi-reference consistency detection and a total least square theory through introducing a multi-reference receiver; 2, introducing an adaptive attenuation factor into a positioning domain according to the characteristic that reference receiver faults and baseline deformation are major integrity risk sources, and designing a Kalman filtering based multi-reference consistency detection algorithm and the like. According to the detection for baseline deformation according to integrity monitoring, the multi-reference receiver is introduced, the optimal estimated value of the baseline solution is acquired through combining integrity monitoring for the deformation with the multi-reference consistency detection and the total least square theory, and integrity monitoring based baseline deformation detection is realized.
Owner:HARBIN ENG UNIV
Point cloud registration method from point to optimum plane in data acquisition of ground laser scanner
InactiveCN109377521AReduce the impact of noiseGood searchImage enhancementImage analysisPoint cloudTransformation parameter
The invention discloses a point cloud registration method from a point to an optimal plane in data acquisition of a ground laser scanner, which comprises the following steps: how to search the optimalplane corresponding to each point and establish a pair of points to the optimal plane; the constrained weighted total least square method is used to calculate the plane parameters; the constrained weighted total least square method is used to calculate the transformation parameters. The invention has better registration accuracy.
Owner:WUHAN UNIV
Vehicle positioning parameter estimation method based on DOA/TOA joint estimation in multipath environment
ActiveCN108769908AIncrease speedLower latencySpatial transmit diversityParticular environment based servicesMobile vehicleEstimation methods
The invention provides a vehicle positioning parameter estimation method based on DOA / TOA joint estimation in a multipath environment. Positioning parameters are extracted via the communication between a vehicle and roadside facilities, the wireless communication between a target vehicle and an RSU follows the IEEE802.11p protocol, and an orthogonal frequency division multiplexing signal is transmitted in a wireless channel thereof; the joint parameter estimation of DOA and TOA is achieved via the analysis of the multipath channel frequency response of the signal, and the channel noise interference is reduced by using the unscented Kalman filtering to improve the overall performance of the method; and the high-speed moving vehicle and a roadside unit RSU establish communication using the OFDM signal and use the total least squares algorithm TLS-ESPRIT based on the rotation invariant technique to calculate the vehicle positioning parameters, and the position information of the target vehicle can be obtained based on the estimated DOA and TOA.
Owner:NANJING UNIV
Inversion method based on polarization interference synthetic aperture radar and device
ActiveCN103323846AReduce fit errorImprove inversion accuracyRadio wave reradiation/reflectionCorrelation coefficientSynthetic aperture radar
The invention discloses an inversion method based on a polarization interference synthetic aperture radar. The inversion method includes the steps of step 1, obtaining one set of image data of the polarization interference synthetic aperture radar (PoLInSAR) of a target to be tested, carrying out straight line fitting on correlation coefficient estimated values obtained from the PoLInSAR image data by utilizing total least squares, and determining the earth surface phase estimated value of the target to be tested, step 2, obtaining a volume scattering decorrelation coefficient through a correlated area bound obtained from the PoLInSAR image data and the fitted straight line, step 3, carrying out inversion on the target to be tested through establishing a lookup table, obtaining inversion parameters of the target to be tested and regarding the inversion parameters as the parameter estimates of the target to be tested. The invention further discloses an inversion device based on the polarization interference synthetic aperture radar. According to the technical scheme, inversion accuracy can be improved, and the technical scheme is especially suitable for being used in inversion of forest parameters.
Owner:INST OF ELECTRONICS CHINESE ACAD OF SCI
Multichannel robustness damping control method based on static state H-infinite loop shaping method
ActiveCN106602588AReduce orderGuaranteed accuracyElectric power transfer ac networkBand-pass filterReduced order
Owner:ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID NINGXIA ELECTRIC POWER COMPANY +1
Arrival time difference positioning method by total least square equalization algorithms
InactiveCN1553214AHigh positioning accuracyIn line with the actual applicationWave based measurement systemsAlgorithmProcess error
In the method positioning is carried on by applying prebalance to error matrix and combining with at least square method according to feature of balanced error matrix covariance matrix being approximately to unit array in order to raise accuracy of positioning; the processed error model includes both of array element position error and estimation error of distance difference which is not the same to each other so it is more is accordance with actual situation comparing to existed positioning method.
Owner:TSINGHUA UNIV
TLS-ESPRTT algorithm-based 2D DOA estimation in large scale MIMO system
ActiveCN104678350ARealize automatic pairingReduce computational complexityRadio wave direction/deviation determination systemsMulti-channel direction-finding systems using radio wavesComputation complexityTotal least squares
The invention discloses a method for estimating a 2D DOA (2-Dimensional Direction of Arrival) by utilizing a TLE ESPRIT (Total Least Square-Estimating Signal Parameter via Rotational in Variance Techniques) algorithm in a large scale MIMO system. The method comprises the following steps: dividing an area array into two partially-overlapped sub-arrays according to a received signal model of the large scale MIMO system, so that the two partially-overlapped sub-arrays meet the requirement for the array shift invariance of the ESPRIT algorithm; calculating a signal subspace of each sub-array according to a 1D ESPRIT (1-Dimensional ESPRIT) algorithm, and estimating elevation information according to a TLS rule; estimating an azimuth by utilizing a direction matrix of one of the sub-arrays, and automatically matching the azimuth with the elevation. According to the method, the problem about 2-dimensional DOA estimation in the large scale MIMO system is effectively solved by adopting the thought of the TLS-ESPRIT algorithm; the azimuth can be matched with the elevation automatically; the computing complexity is relatively low.
Owner:CHONGQING UNIV OF POSTS & TELECOMM
DMWC spectrum sensing phase calibration method based on DOA estimation
InactiveCN110247866AImprove recovery rateCarrier regulationTransmission monitoringFrequency spectrumPhase difference
The invention provides a DMWC spectrum sensing phase difference calibration method based on DOA estimation, aiming at the problem that the recovery rate is low due to the fact that each sensing node of the DMWC spectrum sensing system randomly generates phase difference due to spatial distribution. The DMWC spectrum sensing phase difference calibration method comprises the following steps: (1) acquiring a sampling signal from a DMWC spectrum sensing system structure in which single nodes are arranged into a uniform linear array; (2) obtaining the direction of arrival of the signals through DOA estimation, finding the azimuth parameter with the maximum correlation coefficient as the direction of arrival by applying an array signal processing TLS-ESPRIT algorithm combined with a total least square method, and further obtaining the phase difference of the signals received by the nodes; and (3) calibrating the measurement matrix by using the direction of arrival and the phase difference. Through the DMWC spectrum sensing phase difference calibration method, the influence of the phase difference between the nodes on the signal recovery rate in the DMWC spectrum sensing system is solved, and the noise resistance and the stability of the DMWC spectrum sensing system are greatly improved.
Owner:SICHUAN UNIV
No-chromatic-aberration marking character recognition method
InactiveCN107292309ASolve quality problemsExact plane parametersCharacter and pattern recognitionUsing optical means3d sensorTotal least squares
The invention relates to a no-chromatic-aberration marking character recognition method. The method is characterized by comprising the following specific recognition steps: step 1, using a line structured light 3D sensor to scan point cloud data on 3D characters; step 2, using a total-least squares solution to establish a plane equation of initial point cloud data; step 3, using the plane equation fit in the step 2 to cut total point cloud data, determining points which are 0.3 mm lower than a plane in the point cloud data as points with character depth information, and reserving the points; step 4, displaying cloud of rest points from a normal direction of the plane, to obtain an image of the characters. Depth information of the marking characters is used, and depth image information is acquired through the line structured light sensor, and the method is combined with total-least squares plane fitting to complete extraction of character information in an image. The method is a no-chromatic-aberration three-dimensional character point cloud processing method based on a total-least square method.
Owner:CHANGCHUN INST OF TECH
Near-infrared brain function signal processing method based on differential pathlength factor estimation
ActiveCN107928631AAchieve high-quality inspectionFast optimizationDiagnostics using spectroscopySensorsSingular value decompositionObservational error
The invention relates to a near-infrared brain function signal processing method, in particular to a near-infrared brain function signal processing method based on differential pathlength factor estimation. The invention is intended to solve the problem of the prior art that since a big difference exists between a differential pathlength factor reference value used in modified Lambert-Beer's law and a real differential pathlength factor of an actual measurement object and measurement error disturbances also occur in time series signals of light intensity variation acquired by a light source detector, measurement and extraction of continuous wave near-infrared brain functional activity response signals are low in precision. The method of the invention includes: acquiring a time signal of light intensity variation under the fact that near-infrared rays of different wavelengths have an equal distance away from the detector; using modified Lambert-Beer's law to construct equations for thesignal; modifying the equations in matrix form; subjecting an augmented matrix to singular value decomposition so as to obtain a total least squares solution to concentration variation time signals ofoxyhemoglobin and reduced hemoglobin at the detector. The method of the invention is applicable to the field of brain function signals.
Owner:HARBIN INST OF TECH
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