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30results about How to "Control computation" patented technology
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Web text-based acquiring and screening method of seismic macroscopic anomaly information
ActiveCN104679825AImprove acquisition efficiencyEnsure subject relevanceSpecial data processing applicationsSubject matterThe Internet
The invention belongs to the field of text data mining and provides a web text-based acquiring and screening method of seismic macroscopic anomaly information, applied to collecting and screening seismic macroscopic anomaly text information from the internet. According to the method, based on a Heritrix frame, by the use of a seismic macroscopic anomaly subject descriptor group, a crawling strategy from seismic macroscopic anomaly subject relevancy judging and link ordering to information extraction is customized for three information sources, namely common webs, post bars and social networks, and subject related webs crawled are subjected to information screening mainly from three aspects, namely subjective sentence judging, text subjectivity judging and seismic macroscopic anomaly matching. The method has the advantages that online collection of seismic macroscopic anomaly information is provided with a scientific, efficient and accurate technical means and information acquisition efficiency is greatly improved.
Owner:CHINA AGRI UNIV
Line parameter detection and data non synchronous verification-based double-end ranging method
ActiveCN105652151AImprove ranging accuracyImprove stabilityFault location by conductor typesStaringPower transmission
The invention provides a line parameter detection and data non synchronous verification-based double-end ranging method. The method includes the following steps that: fault staring points corresponding to sampling data at two ends of a fault line are detected, the initial value of a non-synchronous angle between the fault staring points of the data at the two ends is calculated according to the electrical quantity of the fault line in normal operation, the initial value of a fault distance is calculated; and iteration is carried out to realize correction: the non-synchronous angle of the two ends is corrected according to the fault distance, online parameters of the line are calculated, ranging results are optimized, and when allowable error is satisfied, ranging is terminated. According to the method of the invention, the change of the parameters of the line and synchronization of the data at the two ends of the line are fully considered; a ranging result optimization method is utilized to well eliminate the influence of fault phasor measurement deviation on the ranging results, and therefore, fault location accuracy of the power transmission line can be effectively improved.
Owner:WUHAN UNIV +1
Network topology determination-based SDN mixed mode flow table delivery method and device
ActiveCN107222412AAdjust delivery mode in real timeControl computationData switching networksStatic modeMode change
The invention provides a network topology determination-based SDN mixed mode flow table delivery method and device. The method comprises the steps of monitoring whether a network topology changes in a preset period, and marking a network state according to a network topology changing or unchanging condition; adjusting flow table aging time according to the network state; and when a flow table is delivered, selecting a static flow table mode or a dynamic flow table mode to deliver the flow table according to the network state and the flow table aging time. According to the network topology determination-based SDN mixed mode flow table delivery method and device, a topological threshold module is set in an application system and the priorities of the services are set, a north interface is used to invoke the topological information of a controller, circulated determination is performed and mode change is delivered in real time, so as to realize a mixed mode flow table delivery mechanism combining both a static mode and a dynamic mode, massive software operation amount caused by topological change in a large-scale SDN network is effectively controlled, and key services are ensured to be timely and reliable.
Owner:GLOBAL ENERGY INTERCONNECTION RES INST CO LTD +3
Indoor scene three-dimensional point cloud reconstruction method and system based on depth information fusion
PendingCN113012212AControl computationHigh precisionImage enhancementImage analysisReconstruction methodInformation fusion
The invention discloses an indoor scene three-dimensional point cloud reconstruction method based on depth information fusion. The method comprises the following steps: collecting a color image and a depth image of a scene; fusing the color image and the depth image to perform feature extraction and matching; determining the pose of the depth camera and screening out a key frame; generating a three-dimensional point cloud of each key frame according to the key frames; and splicing the three-dimensional point cloud of each key frame frame by frame according to the pose of the depth camera to obtain a globally consistent scene three-dimensional point cloud model. According to the method, whether a point is a feature point is judged by using image brightness information and depth information at the same time in feature extraction, so that the extracted feature points have high representativeness. Meanwhile, homogenization operation is performed on the extracted feature points, it is ensured that the number of the feature points is within a reasonable range, the calculated amount of a system is effectively controlled. The system reliability is improved. The accuracy of the front end is improved, the robustness of the front end is enhanced, and the result of back-end optimization is more accurate or the number of iterations of back-end optimization is reduced.
Owner:NORTHWEST A & F UNIV
Aero-engine high pressure turbine disc optimization design system based on particle swarm and method
ActiveCN106777517APrecise positioningAvoid random abandonmentDesign optimisation/simulationSpecial data processing applicationsAviationHigh pressure
The invention provides an aero-engine high pressure turbine disc optimization design system based on particle swarm and method, and relates to a design technology field of the aero-engine. The system comprises a definition module of the optimization task of the aero-engine high pressure turbine disc, a primary particle swarm / file and a grid generation module, a global optimum selection module based on a gridding neighborhood, a particle update module, a file update module and a file size control module based on the gridding neighborhood, first the gridding jam index precision is improved by using active volume of file in gridding, then the particle jam distance is calculated in the finite region by using the gridding neighborhood message, the confidence level operand is provided for selecting the global optimum and deleting the file particle, the obtained ultimately file is the result of a plurality of the target optimization. During designing a plurality of the target optimization for the aero-engine high pressure turbine disc, starting from increasing precision of the global optimum in particle swarm optimization and of the non-particle deleting, the system and method provides the high-quality result of a plurality of the target optimization.
Owner:NORTHEASTERN UNIV
License plate recognition method and device, electronic equipment and storage medium
PendingCN111310751AImprove accuracyQuality improvementCharacter and pattern recognitionNeural architecturesFeature extractionEngineering
The invention provides a license plate recognition method and device, electronic equipment and a storage medium, and relates to the field of license plate recognition. The license plate recognition method provided by the invention comprises the following steps: firstly, inputting a license plate picture into a feature extraction network to obtain a first feature map of the license plate picture; inputting the first feature map into a spatial transformation network to obtain a second feature map formed by rotating the first feature map; and finally, inputting the second feature map into a number recognition network to determine a recognition result of the license plate photo. According to the method provided by the invention, the spatial transformation network is added between the feature extraction network and the number recognition network; therefore, before the number recognition network performs license plate number recognition according to the feature map, the feature map is rotated by the spatial transformation network, so that the feature map input into the number recognition network is rotated, and the accuracy of recognizing a picture with an inclined license plate is improved.
Owner:BEIJING DIDI INFINITY TECH & DEV
Double-terminal ranging method based on line parameter detection and data asynchronous verification
ActiveCN105652151BImprove ranging accuracyImprove stabilityFault location by conductor typesStaringCable fault location
The invention provides a line parameter detection and data non synchronous verification-based double-end ranging method. The method includes the following steps that: fault staring points corresponding to sampling data at two ends of a fault line are detected, the initial value of a non-synchronous angle between the fault staring points of the data at the two ends is calculated according to the electrical quantity of the fault line in normal operation, the initial value of a fault distance is calculated; and iteration is carried out to realize correction: the non-synchronous angle of the two ends is corrected according to the fault distance, online parameters of the line are calculated, ranging results are optimized, and when allowable error is satisfied, ranging is terminated. According to the method of the invention, the change of the parameters of the line and synchronization of the data at the two ends of the line are fully considered; a ranging result optimization method is utilized to well eliminate the influence of fault phasor measurement deviation on the ranging results, and therefore, fault location accuracy of the power transmission line can be effectively improved.
Owner:WUHAN UNIV +1
Point cloud feature extraction method, device and equipment and storage medium
The invention discloses a point cloud feature extraction method, device and equipment and a storage medium. The method comprises: dividing the space of collected point cloud data into a plurality of voxel grids, and determining the height of the voxel grids according to the space height of the point cloud data; performing convolution and pooling operation on the point cloud data in each voxel gridto obtain a global feature vector layer of the point cloud data; calculating a height feature vector layer and a density feature vector layer of the point cloud data; and combining the global featurevector layer, the height feature vector layer and the density feature vector layer to obtain a combined feature map of the point cloud data. According to the technical scheme, the global feature vector, the density feature vector and the height feature vector are combined, rich point cloud features are extracted, the voxel grids are divided according to the spatial height of the point cloud data,the number of the voxel grids is reduced, the calculation amount is effectively controlled, and the feature extraction efficiency is considered while the feature expression richness of the feature map is improved.
Owner:CHINA FIRST AUTOMOBILE
High-dimensional data clustering method, electronic device and system
InactiveCN109002476AHigh precisionControl computationCharacter and pattern recognitionDigital data protectionDimensionality reductionHigh dimensional
The invention provides a high-dimensional data clustering method, electronic device and system. The method comprises the following steps: obtaining the high-dimensional data to be clustered after dimension reduction and encryption from a plurality of clients; obtaining the corresponding base clustering by calculating the high-dimensional data to be clustered after dimension reduction and encryption; calculating the similarity between any two base clusters in the base clustering set; initializing the preset reference clustering; using the iterative algorithm to obtain candidate reference clusters successively based on the preset reference clusters and the tag sets corresponding to the base clusters. The preset reference clusters are updated iteratively until the preset reference clusters are no longer changed, if the preset reference clusters and candidate reference clusters have higher average similarity with the other clusters in the base cluster set, then the preset reference clusters are used as the final clustering results. The invention improves the accuracy of the high-dimensional data clustering result and controls the calculation amount.
Owner:北京国信杰云科技有限公司
Optimal Design System and Method for High Pressure Turbine Disk of Aeroengine Based on Particle Swarm
ActiveCN106777517BPrecise positioningAvoid random abandonmentDesign optimisation/simulationSpecial data processing applicationsAviationHigh pressure
The invention provides a particle swarm-based optimization design system and method for an aeroengine high-pressure turbine disk, and relates to the technical field of aeroengine design. The system includes an aeroengine high-pressure turbine disk optimization task definition module, an initial particle swarm / archive and grid generation module, a global optimal selection module based on grid neighborhoods, a particle update module, an archive update module and a grid neighborhood-based The file size control module first uses the effective volume of the file in the grid to improve the accuracy of the grid crowding index; then uses the grid neighborhood information to calculate the particle crowding distance in a limited area, providing information for selecting the global optimal and deleting file particles. High-confidence operation objects, the final file obtained is the multi-objective optimization result. When performing multi-objective optimization design of aeroengine high-pressure turbine disks, the present invention provides high-quality multi-objective optimization results by improving the accuracy of the particle swarm algorithm's global optimum and file non-inferior particle deletion.
Owner:NORTHEASTERN UNIV LIAONING
Method for extracting product data characteristics in batches by using matrix generalized inverse
PendingCN112148730AEasy to calculatePrevent rotationSpecial data processing applicationsDatabase indexingFeature extractionAssay
The invention discloses a method for extracting product data characteristics in batches by using matrix generalized inverse, which comprises the following steps of: performing characteristic extraction and data dimensionality reduction on a corresponding sample on the basis of batch analysis and test results of a certain product production process; data disturbance caused by random factors duringdata acquisition can be filtered out, intrinsic characteristics of the data are used for representing the data, and the result stability is achieved; meanwhile, a batch updating mode is adopted in themethod, and the time complexity and the space complexity of calculation are low.
Owner:PURPLE MOUNTAIN LAB
A Lane Line Locating Method in Traffic Surveillance Video
ActiveCN104217427BEdge information is obviousReduce distractionsImage analysisHough transformVideo monitoring
The invention relates to a method for positioning lane lines in traffic surveillance videos. For improving the prior art, an adjustable filter is adopted for edge detection, and thus, the edge information of lane lines is very clear; image threshold processing is carried out by using the global threshold method, which enables as many pixels of lane lines to be obtained as possible and reduces the interference of non-lane line pixels; at last, the detection of the positions of lane lines is realized accurately by using Hough Transform. The amount of computation is reduced and the complexity is lowered while the detection accuracy is enhanced, and thus, the method is applied more conveniently; the working efficiency of surveillance cameras for detecting traffic offence of line pressing of vehicles is enhanced effectively.
Owner:NANJING NANYOU INST OF INFORMATION TECHNOVATION CO LTD
Data processing method and device and electronic equipment
PendingCN113342574AEffectively control the amount of calculationControl computationRedundant operation error correctionControl dataData needs
The invention provides a data processing method and device and electronic equipment, and the method comprises the steps: obtaining to-be-processed target data, and judging whether the target data belongs to pre-configured data which needs to be backed up or not; acquiring backup data of the target data and a backup thread of a preset main thread; processing the target data through the main thread to obtain a first processing result; processing the backup data through the backup thread to obtain a second processing result. and comparing the two processing results to determine whether to send the first processing result or the second processing result to the client. According to the mode, the important data needing to be backed up can be pre-configured according to actual requirements, redundancy calculation processing can be carried out on the important data, redundancy calculation processing can not be carried out on unimportant data, the data calculation amount can be effectively controlled while safe operation of the system is guaranteed, and in addition, according to the method, redundancy calculation is carried out through the backup thread, extra hardware does not need to be added, and therefore the cost can be effectively controlled.
Owner:苏州挚途科技有限公司
Optimizing Method of Particle Number in Grid Cell in Numerical Simulation of Rare Air Flow
ActiveCN111008489BEvenly distributedControl computationDesign optimisation/simulationEngineeringGrid cell
Owner:上海索辰信息科技股份有限公司
Grid unit particle number optimization method in rarefied airflow numerical simulation
ActiveCN111008489AControl computationImprove Simulation EfficiencyDesign optimisation/simulationMesh gridNumerical modeling
The invention relates to a grid unit particle number optimization method in rarefied airflow numerical simulation. The method comprises the following steps of: judging whether the number of simulationparticles in any grid cell is within a set range or not in the numerical simulation of the thin air flow by adopting a DSMC, and if the number of the simulation particles is within the set range, notoptimizing the number of the particles in the grid cell; if the number of the simulation particles exceeds the upper limit value of the set range, repeatedly executing particle fusion operation according to a particle fusion criterion so as to enable the number of the simulation particles in each grid unit to be within the set range; and if the number of the simulation particles is lower than thelower limit value of the set range, repeatedly executing particle separation operation according to the particle separation criterion, so that the number of the simulation particles in each grid unitis within the set range; and controlling the particle number of each grid unit in the simulation domain, so that the simulation particle number in each grid unit does not change greatly along with the unit density and the unit size, and the distribution of the simulation particles on different grid units is balanced.
Owner:上海索辰信息科技股份有限公司
Method and device for displaying web page pictures
ActiveCN104063424BReduce the number of requestsImprove loading speedSpecial data processing applicationsComputer graphics (images)Web page
Owner:XIAOMI INC
Coding circuit and method applied to intra-frame prediction of depth image in video coding
ActiveCN108134940BShorten the timeOvercoming long encoding timesDigital video signal modificationExternal referenceVideo encoding
The invention discloses a coding circuit and a coding method applied to depth image intra-frame prediction in video coding and decoding, the circuit comprises an input data processing module, a coarsesearch module and a fine search module; the input data processing module is a channel for external reference data to be input into the module, and simply processes the data; the coarse search moduleis used for performing initial prediction for a depth image; and the fine search module is used for performing fine prediction again for a prediction result obtained by coarse search. With the circuitand the method provided by the invention, coding time can be reduced, operation cycle of the circuit is shortened, and consequently, performance of the whole video coding circuit is improved.
Owner:HEFEI UNIV OF TECH
Pooling processing method and system and storage medium
PendingCN111461289AIntegrity guaranteedHigh reference valueNeural architecturesNeural learning methodsInformation processingComputer graphics (images)
The invention relates to the field of information processing, in particular to a pooling processing method and system and a storage medium. The pooling processing method comprises the steps of obtaining a pooling weight graph corresponding to a feature graph of a to-be-processed image through a preset weight calculation model; and obtaining a pooling result of the to-be-processed image according to the feature map and the pooling weight map. By adopting the embodiment of the invention, the characteristics of the to-be-processed image can be reserved for dynamic pooling, so that the pooling processing performance is improved.
Owner:MIGU CO LTD +1
A method and device for determining a ground line in a three-dimensional map
The invention discloses a method and a device for determining a ground line in a 3D map, and belongs to the technical field of processing of 3D maps. The method comprises the steps of acquiring a space line corresponding to the ground line, wherein the space line includes a first end point and a second end point; acquiring a 3D earth model of the ground line, wherein the 3D earth model has an earth core; building first planes for the first end point, the second end point and the earth core; then obtaining a first intersection point between the first plane and the 3D earth model; forming the ground line according to the first intersection point. The method is simple to calculate, high in display efficiency, and free of preliminary vector processing.
Owner:北京中盈安信技术服务股份有限公司
Method and device for determining ground line in 3D map
The invention discloses a method and a device for determining a ground line in a 3D map, and belongs to the technical field of processing of 3D maps. The method comprises the steps of acquiring a space line corresponding to the ground line, wherein the space line includes a first end point and a second end point; acquiring a 3D earth model of the ground line, wherein the 3D earth model has an earth core; building first planes for the first end point, the second end point and the earth core; then obtaining a first intersection point between the first plane and the 3D earth model; forming the ground line according to the first intersection point. The method is simple to calculate, high in display efficiency, and free of preliminary vector processing.
Owner:北京中盈安信技术服务股份有限公司
Method for constructing product industry parallel data set by using incremental singular value decomposition method
ActiveCN111178391AEasy to calculatePrevent rotationCharacter and pattern recognitionComplex mathematical operationsData classData set
The invention discloses a method for constructing a product industry parallel data set by using an incremental singular value decomposition method. The method for constructing the data set is based oninfluence factor data and yield and quality data of a certain product production process. Parallel sample data similar to the target data are obtained from historical data samples, and process designand data analysis is performed by utilizing the parallel sample data. According to the method, an incremental singular value decomposition method is utilized, data dimension reduction and principal component analysis can be conducted on mass data in a library, data disturbance caused by random factors during data collection can be filtered out through the analysis, and the dimension and the sample number of imported data are controlled through a left singular matrix U and a right singular matrix. Meanwhile, the algorithm is based on a batch updating mode, and the complexity of the whole calculation is low.
Owner:PURPLE MOUNTAIN LAB
A method and device for delivering SDN hybrid mode flow table based on network topology determination
ActiveCN107222412BAdjust delivery mode in real timeControl computationTransmissionTopology informationEngineering
The present invention provides a method and device for issuing SDN mixed-mode flow tables based on network topology determination, including: monitoring whether the network topology changes within a preset period, and marking the network status according to the network topology change / not change; The network state adjusts the aging time of the flow table; when there is a flow table to be delivered, the static flow table mode or the dynamic flow table mode is selected to deliver the flow table according to the network state and the flow table aging time. The technical solution provided by the present invention realizes the static mode and the dynamic mode by setting the topology threshold module in the application system and classifying the priority of the business, using the northbound interface to call the controller topology information, and performing cyclic judgment and real-time delivery mode conversion The combined mixed-mode flow table distribution mechanism can effectively control the huge amount of software calculations caused by topology changes in large-scale SDN networks, and ensure the real-time performance and reliability of key services.
Owner:GLOBAL ENERGY INTERCONNECTION RES INST CO LTD +3
Acquisition and screening method of earthquake macro anomaly information based on web text
ActiveCN104679825BImprove acquisition efficiencyEnsure subject relevanceSpecial data processing applicationsScreening methodThe Internet
The invention belongs to the field of text data mining and provides a web text-based acquiring and screening method of seismic macroscopic anomaly information, applied to collecting and screening seismic macroscopic anomaly text information from the internet. According to the method, based on a Heritrix frame, by the use of a seismic macroscopic anomaly subject descriptor group, a crawling strategy from seismic macroscopic anomaly subject relevancy judging and link ordering to information extraction is customized for three information sources, namely common webs, post bars and social networks, and subject related webs crawled are subjected to information screening mainly from three aspects, namely subjective sentence judging, text subjectivity judging and seismic macroscopic anomaly matching. The method has the advantages that online collection of seismic macroscopic anomaly information is provided with a scientific, efficient and accurate technical means and information acquisition efficiency is greatly improved.
Owner:CHINA AGRI UNIV
C language oriented source code cloning detection method
ActiveCN110209425ARealize detectionControl computationReverse engineeringSource codeCanonicalization
The invention discloses a C language oriented source code cloning detection method. According to the technical scheme, adopting a context five-sense-organ grammar to define a C language grammar and analyzing a source program, generating an analysis tree of the source program, then converting the whole analysis tree to obtain a converted analysis tree, and then restoring the converted analysis treeinto a source code in a text form. In addition, formatting normalization processing is carried out on the obtained source code in the text form, and cloning detection is performed on the obtained C function through an LCS algorithm to obtain a cloning function detection result of the current to-be-detected function, and during cloning detection, only the code sequence length of the function fallsinto the allowable length range of the cloning function to serve as a cloning comparison object of the current to-be-detected function. The Type 3 clone can be detected, and the calculated amount ofdetection is controlled to a certain extent.
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA
C language-oriented source code clone detection method
ActiveCN110209425BRealize detectionControl computationReverse engineeringTheoretical computer scienceSource code
The invention discloses a C language-oriented source code clone detection method. The technical solution of the present invention is: adopting the context facial features grammar to define the grammar of C language, for realizing the parsing of the source program, generating the parsing tree of the source program, and then transforming the whole parsing tree to obtain the transformed parsing tree, and then Then restore the source code in text form. In addition, it also includes formatting and normalizing the obtained source code in text form. Perform clone detection on the obtained C function through the LCS algorithm to obtain the clone function detection result of the current function to be detected. During clone detection, only the code sequence length of the function falls within the length range of the clone function allowed by it as the current function to be detected The clone comparison object. The invention can realize the detection of Type3 clones, and control the calculation amount of detection to a certain extent.
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA
Method, device and equipment for annotating image and obtaining image annotation model
PendingCN114782514AControl computationImprove labeling efficiencyImage enhancementImage analysisFeature vectorImaging processing
The invention discloses a method, device and equipment for annotating an image and acquiring an image annotation model, and belongs to the technical field of image processing. The method comprises the steps that a first image is acquired, and at least one to-be-labeled target object exists in the first image; obtaining feature maps of a plurality of sizes of the first image, wherein the feature map of each size in the feature maps of the plurality of sizes comprises a plurality of first feature vectors; selecting a first feature vector meeting a screening condition from the first feature vectors of the feature maps of the multiple sizes to obtain a first feature vector corresponding to the at least one target object; and obtaining correlation data between the first feature vectors corresponding to the at least one target object, and labeling each target object in the at least one target object based on the correlation data. By selecting the first feature vector meeting the screening condition, the calculation amount when the target object is labeled is controlled, and the labeling efficiency is improved. And the target object is labeled based on the correlation data between the first feature vectors, so that the labeling accuracy is improved.
Owner:BEIJING SANKUAI ONLINE TECH CO LTD
A Method for Analyzing the Skeleton Structure of Bonded and Riveted Composite Steel of Multi-material Body of Passenger Cars
InactiveCN109684724BSolve binding problemsImprove simulation accuracyGeometric CADDesign optimisation/simulationEpoxyStructure analysis
The invention discloses a passenger car multi-material car body bonding and riveting composite steel skeleton structure analysis method. The method comprises the steps that 1, an area needing glue spreading and epoxy resin-based carbon fiber reinforced composite material spreading is cut out of a to-be-bonded-riveted composite structure steel skeleton structure on a vehicle body, and an area withthe half unit size is cut out of the outer side of each junction of the area; Step 2, dividing unit positions on the vehicle body; Step 3, stretching and bonding the composite structure steel skeletonstructure, marking the positions divided in the step 2, respectively stretching the areas where the glue is laid and the epoxy resin-based carbon fiber reinforced composite material is laid, markingthe positions divided in the step 2, and comparing the positions marked twice; Step 4, determining attributes and failure criteria of the glue spreading layer, the rivet, the epoxy resin-based carbonfiber reinforced composite material spreading layer and the steel skeleton material; And 5, carrying out load test and comparative analysis on the steel skeleton structure of the adhesive-riveting composite structure.
Owner:JILIN UNIV
ADP-based underwater rocker arm system control method and system
InactiveCN114509950AReduce consumptionGeneralTotal factory controlAdaptive controlAutomatic controlMarine engineering
The invention discloses a control method and system of an underwater rocker arm system based on an ADP in the technical field of automatic control. The control method of the underwater rocker arm system comprises the steps that an underwater rocker arm system model considering underwater resistance is established; establishing an energy optimal performance index function of the underwater rocker arm system model; constructing a neural network model of the underwater rocker arm system based on the energy optimal performance index function; and solving the neural network model of the underwater rocker arm system based on an ADP algorithm to obtain an energy optimal control strategy of the underwater rocker arm system. According to the invention, less energy is consumed when the underwater rocker arm moves and resets within a small range.
Owner:WUXI VOCATIONAL & TECHN COLLEGE
Method and base station of implementing time-division CDMA system uplink synchronous control
InactiveCN101162937BFast trackFew control parametersBaseband system detailsRadio transmission for post communicationTime domainChannel impulse response
The invention provides a method realizing an uplink synchronous control of a time-division CDMA system. The step includes that: the gravity position centre of an impulse response envelop of a time domain uplink consumer channel is calculated. According to the comparison result of the gravity position centre of the envelope and the center position of a channel estimation window, an uplink synchronous control order is generated. The invention also provides a base station realizing the uplink synchronous control of the time-division CDMA system. The base station includes a channel estimation module, a gravity position centre generating module of the impulse response envelop of the uplink consumer channel, a decision module of the uplink synchronous control and a sending module of the uplink synchronous order. The invention can reduce the control parameters and simplifies the calculation, which is applicable to various wireless multipath fading environments.
Owner:POTEVIO INFORMATION TECH CO LTD
A multi-rotor UAV optical flow hovering method based on imu attitude compensation
ActiveCN107390704BGuaranteed accuracyImprove adaptabilityImage enhancementImage analysisUncrewed vehicleOptical flow
An IMU attitude compensation-based multi-rotor unmanned aerial vehicle optical flow hovering method provided by the present invention adds the IMU attitude compensation on the basis of an optical flow result, thereby guaranteeing the unmanned aerial vehicle actual hovering accuracy very well. By adopting the FAST angular points as a feature point extraction method, the IMU attitude compensation-based multi-rotor unmanned aerial vehicle optical flow hovering method can be suitable for an environment that is relatively weaker in textures, and does not need to depend on any priori knowledge, thereby improving the adaptability of an unmanned aerial vehicle very well. By taking an optical flow method as the basis, the IMU attitude compensation-based multi-rotor unmanned aerial vehicle optical flow hovering method controls the calculation amount effectively under the premise of guaranteeing the precision, thereby guaranteeing the real-time performance of an algorithm, and realizing the actual processing speed that can reach 50 Hz on an embedded system.
Owner:西安因诺航空科技有限公司
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