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Massive MIMO signal detection method based on improved Newton iteration
ActiveCN109150278AFast convergence rateReduce computational complexitySpatial transmit diversitySeries expansionIteration process
The invention belongs to the technical field of communication, and relates to a massive MIMO signal detection method based on improved Newton iteration. The massive multiple-input multiple-output (MIMO) system needs to deal with a lot of matrix inversion operation in the signal detection process, many researches are performed to avoid matrix inversion in recent years, and the methods can be roughly divided into two kinds: the approximation method and the iteration method. Firstly the relationship between the two kinds of methods is introduced and then the improved Newton iteration method is put forward on the basis thereof. The Newton iteration method is superior to the Newman series expansion method and the present Newton iteration method. Besides, the matrix-matrix product is transformedinto the matrix-vector product in the iteration process so as to greatly reduce the computational complexity. Finally, numerical simulation verifies the advantages of the improved Newton iteration, and the performance of the MMSE method can be achieved by a small number of iterations.
Owner:UNIV OF ELECTRONIC SCI & TECH OF CHINA
Guidance law design method for unmanned aerial vehicle path tracking control
ActiveCN107992069ASolve the problem of tracking too slowFast convergence rateAutonomous decision making processPosition/course control in three dimensionsElectricityUncrewed vehicle
The invention discloses a guidance law design method for unmanned aerial vehicle path tracking control. The method includes the following steps that S1, the flying speed of an unmanned aerial vehicleis V, projection is conducted on a preset track from the initial position A of the unmanned aerial vehicle, a projection point is marked as O, and the distance between the flying path of the unmannedaerial vehicle and the preset track is marked as d; S2, a circle with the radius being r is obtained with the projection point as the circle center, the intersection point of the circle and the presettrack in front of the unmanned aerial vehicle speed direction is marked as B, the length of AB is marked as L1*, and a L1* guidance law is designed with the point B as a reference point; S3, a reference circle O1* with the radius being R* is selected, and an unmanned aerial vehicle lateral acceleration instruction as* is calculated by using centripetal acceleration and motion geometrical relationship. The method has the advantage that the problem that the tracking speed is too low in tracking control in the prior art can be solved.
Owner:SHANGHAI RADIO EQUIP RES INST
Hierarchical codebook structure design method of joint method
ActiveCN105959044ASignal emission is largeLarge receiving energySpatial transmit diversityHigh level techniquesComputer architectureDesign methods
The present invention provides a hierarchical codebook structure design method of a joint method used for the wireless communication technology. The codebook designed by the invention satisfies two design principles that all code words in a same layer needs to cover a whole space, the space coverage range of any code word in any layer of a codebook must be the set of the code words in a next layer; at the same time the lobe width of a kth layer is 2 / 2k, and the codebook of a last layer uses an expression form of a channel pointing vector. In the time of generating the code words of each layer, firstly the first code word of each layer is generated, then the code word is rotated to point to different directions, and all code words of the layer can be constructed. The hierarchical codebook designed by the invention is employed to carry out searching, the convergence rate of a search method is fast, the search success rate is high, the gain of beamforming is high, the receiving power is large at any stage, the utilization rate of emitting power is high, and the robustness is good in a condition of multiple paths.
Owner:BEIHANG UNIV
Bearing fault diagnosis method
ActiveCN111272429AImprove efficiencyHigh precisionMachine part testingCharacter and pattern recognitionAlgorithmRolling-element bearing
The invention discloses a bearing fault diagnosis method. The method comprises the following steps: carrying out fault feature extraction on a rolling bearing vibration signal; constructing an SVM classifier model; updating penalty parameters and kernel function parameters of a classifier of the SVM according to a training set and an IWOA algorithm; constructing a test model of the SVM according to the obtained optimal penalty parameter and the optimal kernel function parameter; and according to a test set, optimal penalty and the optimal kernel function parameters, adopting the longest optimization time, the shortest optimization time, the average optimization time, the average accuracy and the standard deviation as evaluation criteria to determine a fault result of a bearing after ten-fold cross validation. The method is high in bearing fault diagnosis capability and high in recognition accuracy.
Owner:GUIZHOU UNIV
A medical image registration method based on super pixel guide
ActiveCN109215064AImprove registration accuracyReduce computational complexityImage enhancementImage analysisImage resolutionReference image
The invention discloses a medical image registration method based on a superpixel guide, comprising the following steps: 1) rigidly pre-registering a reference image and a floating image by adopting an FFD registration algorithm based on a B-spline to obtain a pre-registered reference image and a floating image; 2) downsampling the pre-registered reference image and the floating image to form a multi-resolution pyramid with a series of l; 3) the image registration of the multi-resolution scheme starts from the coarsest resolution, and gradually registers from coarse to fine. Under the currentresolution l, after iteration, the obtained spatial transform ul is up-sampled to obtain ul-1, and then use the space transformation ul Pairs of Pyramids 1-1 level image is transformed, and the obtained image is iterated again until the end of the lowest layer of the pyramid image; 4) the final obtained spatial transformation u is applied to the floating image after rigid registration to obtain the final registration result image. The invention obtains the registration accuracy and robustness superior to the current mainstream DIR registration models such as the FFD model and the DD model based on the B-spline.
Owner:SOUTH CHINA UNIV OF TECH
Large-scale MIMO signal detection method based on Jacobi iteration
ActiveCN109245804AFast convergenceFast convergence rateSpatial transmit diversityMatrix additionComputation complexity
The invention discloses a large-scale MIMO signal detection method based on Jacobi iteration, and belongs to the technical field of wireless communication. The method comprises the steps: converting amatrix inversion process into an iteration process of matrix multiplication and matrix addition, providing the search direction for a Jacobi algorithm through a gradient algorithm and an overall correction acceleration method, and determining a correction coefficient of an iteration equation. According to the invention, the method performs the estimation of a high-dimensional matrix inversion process through an improved Jacobi iteration method, and converts the matrix inversion process into the iteration process of matrix multiplication and matrix addition, thereby greatly reducing the computing complexity. The gradient algorithm and the overall correction acceleration method are used for providing the search directions for the Jacobi algorithm and determining the correction coefficient of the iteration equation, thereby enabling the iteration convergence to be better, and enabling the convergence speed to be higher.
Owner:JIANGNAN UNIV
Mixed coherent polarization method based on phase control and polarization control
ActiveCN107037597ACompact structureImprove stabilityOptical elementsPhotovoltaic detectorsSynthesis methods
The invention discloses a mixed coherent polarization method based on phase control and polarization control. According to the method, through cascaded phase control and polarization control, high-efficiency coherent polarization synthesis of three input light beams is realized by means of an optical fiber and an optical fiber device, thereby outputting linearly polarized light. A device required for realizing the method comprises an optical fiber phase compensator, an optical fiber polarization beam combiner, an optical fiber polarization controller, an optical fiber polarization analyzer, a photoelectric detector and a synthesis controller. Based on the method, the number of the input light beams can be increased to above three. Compared with a coherent polarization synthesis method based on phase control, the mixed coherent polarization method can prevent an influence of unmatched input light beam strength and realizes high-efficiency coherent polarization synthesis.
Owner:INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
Robot calibration method based on improved differential evolution algorithm
ActiveCN108908335AImprove the defect of poor global convergenceImprove recognition accuracyProgramme-controlled manipulatorActuatorLaser tracker
The invention discloses a robot calibration method based on an improved differential evolution algorithm, and the robot calibration method is used for six-freedom-degree industrial robot geometric parameter calibration and establishment of a robot kinematics model. The robot calibration method comprises the steps that a robot moves in the workspace, the joint corner of the robot at each road pointposition is read and recorded, and meanwhile, the actual position coordinate of a robot tail end actuator at each road point position is measured and recorded by utilizing a laser tracker; the theoretical position coordinate of the robot is calculated; the theoretical distance and the actual distance between the road points are calculated, and an objective function is established to determine structure parameters to be identified; the structure parameters are identified by utilizing the improved differential evolution algorithm; and identified structure parameter errors are substituted in forvalidation. By means of the robot calibration method based on the improved differential evolution algorithm, a simulated annealing algorithm and a population diversity evaluation function are integrated, the defect of poor global convergence of a traditional differential evolution algorithm is overcome, the accuracy and efficiency of robot structure parameter error identification are improved, and meanwhile, the characteristic of the fast convergence rate of the differential evolution algorithm is also absorbed.
Owner:HEFEI UNIV OF TECH
Active noise cancellation method based on improved variable step size LMS self-adaption
PendingCN111814515ASmall steady state errorAchieve convergenceDigital technique networkCharacter and pattern recognitionSignal waveAdaptive filter
The invention relates to an active noise cancellation method based on improved variable step size LMS self-adaption. The invention is a self-adaption based noise cancellation system. The system comprises a signal source, a noise source, a self-adaptive filter, a self-adaptive noise canceller, a high-sensitivity pickup, a low-sensitivity pickup and a controller. According to the active noise cancellation method based on variable step size LMS self-adaption for adjusting the step length through three-order self-correlation of the error signal e (k), the step size adjustment of the algorithm is not affected by Gaussian color noise of the system, a higher convergence rate can be obtained while steady-state errors are kept, and noise filtering is thorough in practical application. Compared witha classic LMS algorithm and the GSVS-LMS algorithm, the classic LMS algorithm have the disadvantages that the output distortion is relatively serious; although the outputs of the GSVS-LMS algorithm and the algorithm of the invention have noise residues, the signal waveform is not distorted, and the algorithm of the invention can restore the original signal faster than the GSVS-LMS algorithm.
Owner:HARBIN INST OF TECH
Combined learning method and device based on gradient momentum acceleration
ActiveCN110889509AFast convergenceFast convergence rateInternal combustion piston enginesMachine learningAlgorithmDescent algorithm
The invention discloses a combined learning method and device based on gradient momentum acceleration, and the method comprises the steps: embedding the same machine learning model on each edge node,and executing a momentum gradient descent algorithm in a current aggregation interval to obtain a model parameter and a momentum parameter at each moment in the current aggregation interval; enablingthe central server to aggregate the model parameters to obtain global model parameters, and aggregate the momentum parameters to obtain global momentum parameters; substituting the global model parameters in the current aggregation interval into a loss function formula to obtain a loss function value, comparing the loss function value with the loss function value obtained in the previous aggregation interval to obtain optimized global model parameters, and obtaining the optimized global model parameters after calculation of all the aggregation intervals is completed. The method has the advantages that the momentum gradient descent algorithm is used in the local updating process of joint learning, namely the parameter updating process of the edge nodes, and the algorithm convergence speed is high.
Owner:ANHUI CHAOQING INFORMATION ENG
An energy flow simulation method and device for an RLC transient model of an integrated energy system
PendingCN109241677AReduce the difficulty of modeling and simulationReduce the difficulty of simulationDesign optimisation/simulationSpecial data processing applicationsModeling and simulationDynamic simulation
The invention provides an energy flow simulation method and a device for an RLC transient model of an integrated energy system. The dynamic simulation initial value is determined according to a pre-constructed RLC transient model of the integrated energy system. According to the initial value of the dynamic simulation, the RLC transient model of the integrated energy system is simulated to obtainthe head and end parameters of each branch in the integrated energy system. The energy flow fluctuation of the branch is determined by the head and end parameters of the branch. The RLC transient model of integrated energy system is constructed based on RLC component model and energy conversion component model, which reduces the difficulty of modeling and simulation, improves the reliability and accuracy of calculation, and converges quickly. The unified modeling of heterogeneous energy flow is completed, and the multi-time scale problem of dynamic simulation of integrated energy system is solved. The invention can adopt mature Runge-Kutta algorithm to solve the RLC transient model of the integrated energy system, which can reduce the difficulty of simulation calculation of the integratedenergy system.
Owner:CHINA ELECTRIC POWER RES INST +2
Infrared image non-uniformity correction method based on scene inter-frame registration
The invention discloses an infrared image non-uniformity correction method based on scene inter-frame registration. The method comprise following steps: obtaining an original digital image by performing A / D conversion to an original simulation image acquired by an infrared detector; then performing correction to the original digital image to obtain an output pixel matrix Yn-1(i, j) of a corrected (n-1)th frame and an output pixel matrix Yn(i, j) of a corrected nth frame; performing statistics to the output pixel matrix Yn-1(i, j) of the corrected (n-1)th frame and obtaining its average value averagen; finally, performing updating to o<n+1>(i, j) and g<n+1>(i, j) through the self-adjusting of the output pixel matrix Yn-1(i, j) of the corrected (n-1)th frame, the threshold value ERRn(i, j), and the convergence step length step to achieve non-uniformity correction of the whole image. The method is simple and efficient; convergence rate is high; highly non-uniform images can be corrected by the method; good correction effect can be achieved by the method in different scenes; the method has broad application.
Owner:NANJING UNIV OF SCI & TECH
Interference alignment precoding method in MIMO (Multiple Input Multiple Output) interference channel based on self-adaptive composite cost function
ActiveCN105577250AInhibition lossReasonable proportionSpatial transmit diversityWeight coefficientResidual interference
The invention discloses an interference alignment precoding method in an MIMO interference channel based on a self-adaptive composite cost function belonging to the wireless communication technical field. The core concept is realizing the optimization design of a precoding matrix through the assistance of an intermediate variable. The method comprises following steps: firstly, defining the weighting difference of the residual interference and the desired signal power in a desired subspace as the cost function, obtaining the self-adaptive selection mode of a weight coefficient through a maximal-ratio combining concept; then constructing an assist function according to the decoding mode of a receiving end, converting an interference suppression matrix into the intermediate variable, thus compositing the cost function; finally, realizing optimized solution of the self-adaptive composite cost function through a gradient descent method on Glassman manifold, thus obtaining the optimum solution of the precoding matrix. According to the method of the invention, the double targets of suppressing interferences and reserving desired signals are finished through relatively little complexity cost; therefore, the system performance is improved; the realization mechanism is simple and has wide applicability.
Owner:CHONGQING UNIV OF POSTS & TELECOMM
Nonuniformity correction method of interframe registration based on time-domain high-pass filtering
ActiveCN106153198AEasy to correctFast convergence rateRadiation pyrometryTime domainCorrection algorithm
The invention discloses a nonuniformity correction method of interframe registration based on time-domain high-pass filtering. The method comprises the following steps: carrying out A / D (Analog to Digital) conversion on an original analog image acquired by an infrared focal plane detector to obtain an original digital image, then multiplying the original digital image with a corresponding gain to obtain an image, passing through a low-pass filter to obtain a filtered image, then correcting the image by a high-pass filter, correcting the image which is subjected to the time-domain high-pass filtering through a nonuniformity correction algorithm with minimum inter-frame errors, finally obtaining a corrected image. The nonuniformity correction method of the interframe registration based on the time-domain high-pass filtering disclosed by the invention has the characteristics of simplicity, high efficiency and fast convergence rate, can correct images having massive nonuniformity all around when the nonuniformalty is strong, and has good correction effects for different scenes and wide applicability.
Owner:NANJING UNIV OF SCI & TECH
I/Q imbalance cancellation algorithm based on affine projection adaptation
ActiveCN106961402AIntegrity guaranteedGuaranteed correctnessTransmitter/receiver shaping networksLinear modelSelf adaptive
The invention provides an I / Q imbalance cancellation algorithm based on affine projection adaptive filtering, relating to a blind cancellation algorithm without training sequences. The whole cancellation process is modeled as an adaptive filtering mode, a wide linear model is used as the filtering structure prototype of a neutralizing filter, the restoration the 'moderation' of signals disturbed by I / Q imbalance is taken as the goal, and an adaptive process of the filter is deduced based on the principle of affine projection adaptation, which means that an update iteration rule of filter tap weights is obtained. Additionally, combined with some improvements of I / Q imbalance situations, the algorithm can be applied to engineering practices; and finally, the overall operation flow of the cancellation algorithm can be obtained; and computer simulation results can verify that the impact of the I / Q imbalance on the signals can be effectively canceled by the algorithm, and meanwhile, compared with a traditional cancellation algorithm, the algorithm provided by the invention has a faster convergence rate and more stable MSE performance.
Owner:SOUTHEAST UNIV
Reactive equal partitioning method of alternating current/direct current mixed micro power grid based on finite time control
ActiveCN108964150AMeet the needs of plug and playImprove reliabilityReactive power adjustment/elimination/compensationReactive power compensationPower gridEngineering
The invention discloses a reactive equal partitioning method of alternating current / direct current mixed micro power grid based on finite time control. The method comprises following steps of step 1:establishing an alternating current / direct current mixed power grid control framework considering alternating-direct current mutual support; step 2: establishing a reactive control model of the alternating current / direct current mixed micro power grid; step 3: acquiring reactive power change quantity of the alternating current / direct current mixed micro power grid; and step 4: based on finite timeconsistency, providing an alternating current / direct current reactive equally partitioning strategy. According to the invention, by constructing the mixed power grid distributed control model considering the alternating current / direct current interaction, a one-time control model of reactive control is established, requirements of the plug and play of a distributed power supply are met and reliability of system control is improved.
Owner:NANJING UNIV OF SCI & TECH
Output feedback trajectory tracking control method with predetermined performance and dead zone input constraint for electromechanical system
InactiveCN113741469AConstraint overshootFast convergence ratePosition/course control in two dimensionsPerformance functionBackstepping
The invention discloses an output feedback trajectory tracking control method with predetermined performance and dead zone input constraints for an electromechanical system. The method comprises the following steps: firstly, establishing an electromechanical system model containing dead zone input, carrying out linear processing on a dead zone model, and giving a reference tracking trajectory; secondly, defining a tracking error, introducing a predetermined performance function, and converting an original system into a system with predetermined performance constraints; in order to solve the problem that the angular position, the angular speed and the motor current in the electromechanical system are not easy to measure or the measurement precision is not high, designing a neural network state observer to estimate the state of the electromechanical system; and finally, solving the problem of complexity explosion in the traditional backstepping method by adopting a command filter technology, and constructing adaptive output feedback control in combination with an adaptive backstepping method and a neural network state observer under predetermined performance control and dead zone input constraints. The method effectively improves the transient and steady-state performance of a system with an unknown state, accurately realizes trajectory tracking, and is suitable for electromechanical system control with accurate positioning.
Owner:QUFU NORMAL UNIV
A reactive power sharing method for AC-DC hybrid microgrid based on finite time control
ActiveCN108964150BMeet the needs of plug and playImprove reliabilityReactive power adjustment/elimination/compensationReactive power compensationMicrogridControl engineering
The invention discloses a reactive power sharing method based on limited-time control of an AC-DC hybrid microgrid, comprising the following steps: Step 1: Establish an AC-DC hybrid microgrid control framework considering AC-DC interactive support; Step 2: Establish The reactive power control model of the AC-DC hybrid microgrid; step 3: collecting the reactive power change, quantity of the AC-DC hybrid microgrid; step 4: based on the finite-time consistency AC-DC reactive power equalization strategy; The DC-interactive hybrid microgrid distributed control model establishes a primary control model for reactive power control, which satisfies the plug-and-play requirements of distributed power sources and improves the reliability of system control.
Owner:NANJING UNIV OF SCI & TECH
Hierarchical codebook structure design method based on joint method
ActiveCN105959044BImplementing the Joint Beam Search MethodHigh gainSpatial transmit diversityHigh level techniquesComputer architectureDesign methods
The present invention provides a hierarchical codebook structure design method of a joint method used for the wireless communication technology. The codebook designed by the invention satisfies two design principles that all code words in a same layer needs to cover a whole space, the space coverage range of any code word in any layer of a codebook must be the set of the code words in a next layer; at the same time the lobe width of a kth layer is 2 / 2k, and the codebook of a last layer uses an expression form of a channel pointing vector. In the time of generating the code words of each layer, firstly the first code word of each layer is generated, then the code word is rotated to point to different directions, and all code words of the layer can be constructed. The hierarchical codebook designed by the invention is employed to carry out searching, the convergence rate of a search method is fast, the search success rate is high, the gain of beamforming is high, the receiving power is large at any stage, the utilization rate of emitting power is high, and the robustness is good in a condition of multiple paths.
Owner:BEIHANG UNIV
A Tracking Control Method for Hypersonic Vehicle with Disturbance Observer
The invention relates to a hypersonic aerocraft tracking control method with an interference observer. The problem that the fact that the observer is bounded in the interference process of an observing system cannot be proved in the prior art is solved. The method provided by the invention comprises the steps that 1 a second-order system model with system interference is established according to the longitudinal input and output linearization model of a hypersonic aerocraft; 2 according to the second-order system model with system interference in the step 1, a finite time terminal sliding mode controller is designed based on a sliding mode control theory; and 3 system stability proving is carried out on the finite time terminal sliding mode controller designed in the Step 2. According to the method provided by the invention, the finite time of the sliding surface of the system is stable, and the system state is asymptotically convergent. The method provided by the invention is applied to the field of hypersonic aerocraft control.
Owner:HARBIN INST OF TECH
A Distributed Robust Multi-objective Power Distribution and Control System for Island Microgrid
ActiveCN111864804BImprove scalabilityImprove reliabilitySingle network parallel feeding arrangementsSystems intergating technologiesMicrogridTransceiver
Owner:CHONGQING UNIV
Method for parameter identification of chaotic systems
ActiveCN108388120ANarrow searchImprove convergence rateAdaptive controlSecure communicationState variable
The invention provides a method for parameter identification of chaotic systems for a class of chaotic systems with unknown partial parameters. The method takes the driving response structure as the framework, adopts the objective function related to the synchronization error of some state variables, and uses the directional pattern search method to adaptively adjust an unknown parameter until theobjective function value reaches the minimum, that is, the estimation of the product of the unknown parameters is realized; and the amplitude ratios of the corresponding state variables of the driving and response systems are calculated, and the ratios and the estimated values of the product of the parameters are combined to estimate each parameter. Theoretical analysis and experimental simulations show that the proposed method can estimate the unknown parameters of the chaotic system well, the structure is simple, the convergence speed is fast, the error is small, and the method can be usedfor the decryption of chaotic secure communication.
Owner:SHENYANG POLYTECHNIC UNIV
A Non-uniformity Correction Method for Inter-Frame Registration Based on Subspace Projection
InactiveCN106570828BEasy to correctFast convergence rateImage enhancementPattern recognitionDigital image
The invention discloses an inter-frame registration non-uniformity correction method based on subspace projection. An original digital image is obtained after the original analog image acquired by an infrared detector is subjected to A / D conversion. Then, rows and columns are subjected to preprocessing in which row mean values and column mean values are enabled to be zero. A row matrix and a column matrix are projected onto the respective subspaces. Row displacement and column displacement of two adjacent frames are obtained in respective subspaces. Finally, the obtained row (column) displacement is substituted into an inter-frame registration formula to achieve non-uniformity correction in order to obtain a corrected image. The inter-frame registration non-uniformity correction method is simple and high in efficiency, can process the non-uniformity image with a large amount of noise and obtains a better correction effect.
Owner:NANJING UNIV OF SCI & TECH
Large-Scale MIMO Signal Detection Method Based on Jacobian Iteration
ActiveCN109245804BFast convergenceFast convergence rateSpatial transmit diversityMatrix additionComputation complexity
The invention discloses a large-scale MIMO signal detection method based on Jacobi iteration, and belongs to the technical field of wireless communication. The method comprises the steps: converting amatrix inversion process into an iteration process of matrix multiplication and matrix addition, providing the search direction for a Jacobi algorithm through a gradient algorithm and an overall correction acceleration method, and determining a correction coefficient of an iteration equation. According to the invention, the method performs the estimation of a high-dimensional matrix inversion process through an improved Jacobi iteration method, and converts the matrix inversion process into the iteration process of matrix multiplication and matrix addition, thereby greatly reducing the computing complexity. The gradient algorithm and the overall correction acceleration method are used for providing the search directions for the Jacobi algorithm and determining the correction coefficient of the iteration equation, thereby enabling the iteration convergence to be better, and enabling the convergence speed to be higher.
Owner:JIANGNAN UNIV
Massive MIMO signal detection method based on improved Newton iteration
ActiveCN109150278BFast convergence rateReduce computational complexitySpatial transmit diversityMulti inputRound complexity
The invention belongs to the technical field of communication, and relates to a massive MIMO signal detection method based on improved Newton iteration. The massive multiple-input multiple-output (MIMO) system needs to deal with a lot of matrix inversion operation in the signal detection process, many researches are performed to avoid matrix inversion in recent years, and the methods can be roughly divided into two kinds: the approximation method and the iteration method. Firstly the relationship between the two kinds of methods is introduced and then the improved Newton iteration method is put forward on the basis thereof. The Newton iteration method is superior to the Newman series expansion method and the present Newton iteration method. Besides, the matrix-matrix product is transformedinto the matrix-vector product in the iteration process so as to greatly reduce the computational complexity. Finally, numerical simulation verifies the advantages of the improved Newton iteration, and the performance of the MMSE method can be achieved by a small number of iterations.
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA
A method and system for determining overall parameters of a solar unmanned aerial vehicle
ActiveCN108216679BEfficient designMatch actual usage patternsGround installationsUncrewed vehicleSolar cell
The invention discloses a general parameter determination method and system for a solar unmanned aerial vehicle. The solar unmanned aerial vehicle adopts solar radiation as the unique energy source, and during a flight of the unmanned aerial vehicle, energy collection, energy consumption and energy storage are involved; moreover, since an unmanned aerial vehicle body, energy power and flight management are coupled with one another, a conventional design method and process for airplanes cannot be directly applied. According to the method, on the basis of a weight balance relation, a power balance relation and an energy balance relation of a point with the weakest solar energy in a flight profile, iterative computation is conducted on weight characteristics, aerodynamic characteristics and other main parameters, and general parameters of a primary scheme meeting tactical and technical index requirements can be obtained, wherein the general parameters mainly include the total weight of the unmanned aerial vehicle, the weight of a subsystem, a reference appearance, a lift-drag ratio, a solar cell laying rate, power characteristics matched with each kernel component of the whole systemand the like. The general parameter determination method for the solar unmanned aerial vehicle can be applied to primary general scheme design of this type of unmanned aerial vehicle.
Owner:CHINA ACAD OF AEROSPACE AERODYNAMICS
A Non-uniformity Correction Method of Infrared Image Based on Scene Frame Registration
InactiveCN105741238BEasy to correctFast convergence rateImage enhancementComputer visionDigital image
The invention discloses an infrared image non-uniformity correction method based on scene inter-frame registration. The method comprise following steps: obtaining an original digital image by performing A / D conversion to an original simulation image acquired by an infrared detector; then performing correction to the original digital image to obtain an output pixel matrix Yn-1(i, j) of a corrected (n-1)th frame and an output pixel matrix Yn(i, j) of a corrected nth frame; performing statistics to the output pixel matrix Yn-1(i, j) of the corrected (n-1)th frame and obtaining its average value averagen; finally, performing updating to o<n+1>(i, j) and g<n+1>(i, j) through the self-adjusting of the output pixel matrix Yn-1(i, j) of the corrected (n-1)th frame, the threshold value ERRn(i, j), and the convergence step length step to achieve non-uniformity correction of the whole image. The method is simple and efficient; convergence rate is high; highly non-uniform images can be corrected by the method; good correction effect can be achieved by the method in different scenes; the method has broad application.
Owner:NANJING UNIV OF SCI & TECH
A Guidance Law Design Method for UAV Path Following Control
ActiveCN107992069BSolve the problem of tracking too slowFast convergence rateAutonomous decision making processPosition/course control in three dimensionsUncrewed vehicleControl theory
The invention discloses a guidance law design method for unmanned aerial vehicle path tracking control. The method includes the following steps that S1, the flying speed of an unmanned aerial vehicleis V, projection is conducted on a preset track from the initial position A of the unmanned aerial vehicle, a projection point is marked as O, and the distance between the flying path of the unmannedaerial vehicle and the preset track is marked as d; S2, a circle with the radius being r is obtained with the projection point as the circle center, the intersection point of the circle and the presettrack in front of the unmanned aerial vehicle speed direction is marked as B, the length of AB is marked as L1*, and a L1* guidance law is designed with the point B as a reference point; S3, a reference circle O1* with the radius being R* is selected, and an unmanned aerial vehicle lateral acceleration instruction as* is calculated by using centripetal acceleration and motion geometrical relationship. The method has the advantage that the problem that the tracking speed is too low in tracking control in the prior art can be solved.
Owner:SHANGHAI RADIO EQUIP RES INST
Distributed robust island microgrid multi-target power distribution and control system
ActiveCN111864804AImprove scalabilityImprove reliabilitySingle network parallel feeding arrangementsSystems intergating technologiesMicrogridTransceiver
The invention relates to a distributed robust island microgrid multi-target power distribution and control system, and belongs to the field of intelligent power grids. The system is composed of an equipment layer, a control layer and a communication layer. The communication layer is formed by communication connection between communication transceivers and is used for information exchange between the power generation units; the control layer generates a control signal of the distributed power generation device according to a designed controller by using the local measurement information and theinformation exchanged by the communication network; the equipment layer is a physical power infrastructure, and the distributed power generation device responds to a control signal to realize transmission of power energy. Compared with the existing finite time and fixed time control scheme which only realizes proportional active power distribution control, the designed rapid robust control schemerealizes active power economic distribution control under various optimization objectives, and is beneficial to improving the total benefit. In addition, the controller can enable the convergence rate of the control system to be higher by utilizing an exponential function.
Owner:CHONGQING UNIV
A non-uniformity correction method for inter-frame registration based on temporal high-pass filtering
ActiveCN106153198BEasy to correctFast convergence rateRadiation pyrometryTime domainCorrection algorithm
The invention discloses a nonuniformity correction method of interframe registration based on time-domain high-pass filtering. The method comprises the following steps: carrying out A / D (Analog to Digital) conversion on an original analog image acquired by an infrared focal plane detector to obtain an original digital image, then multiplying the original digital image with a corresponding gain to obtain an image, passing through a low-pass filter to obtain a filtered image, then correcting the image by a high-pass filter, correcting the image which is subjected to the time-domain high-pass filtering through a nonuniformity correction algorithm with minimum inter-frame errors, finally obtaining a corrected image. The nonuniformity correction method of the interframe registration based on the time-domain high-pass filtering disclosed by the invention has the characteristics of simplicity, high efficiency and fast convergence rate, can correct images having massive nonuniformity all around when the nonuniformalty is strong, and has good correction effects for different scenes and wide applicability.
Owner:NANJING UNIV OF SCI & TECH
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