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227results about How to "Accurate correction" patented technology

Geometric correction method of airborne imaging hyperspectrum of unmanned aerial vehicle

ActiveCN106127697ALow-precision POS data optimizationHigh precisionImage enhancementImage analysisAngular pointUncrewed vehicle
The invention discloses a geometric correction method of an airborne imaging hyperspectrum of an unmanned aerial vehicle. At present, an image obtained according to POS (Positioning and Orientation System) data exhibits an overlarge deviation with practicality, and the point, line and surface distortion of scenery is large and is difficult in geometric fine correction through polynomial correction. The method comprises the following steps: collecting the position gesture information of a low-precision POS sensor of a current unmanned aerial vehicle to correct a collimation axis error; according to the angular point and outline information of ground object characteristics, preprocessing the POS data to obtain corresponding elements of exterior orientation; carrying out collinearity equation correction; and through a ground correction point, carrying out polynomial correction. By use of the geometric correction method, a relationship between natural ground object characteristics and the own error of the sensor is considered, correction accuracy is improved, the aerial photography low-precision POS data of the unmanned aerial vehicle is optimized, the aerial photography image of the unmanned aerial vehicle can be accurately corrected only by carrying the low-precision POS sensor and a hyperspectral imager, and technical support is provided for the wide application of the current low-cost imaging hyperspectrum of an unmanned aerial vehicle.
Owner:天岸马科技(黑龙江)有限公司

Inertial positioning method and system using vision-aided correction

The invention discloses an inertial positioning method and an inertial positioning system using vision-aided corrosion. The inertial positioning system comprises an inertial sensor, a positioning identifier, an image pickup module, an image processing unit and a correcting unit, wherein the positioning identifier is used for identifying a positioning point; the image pickup module is used for obtaining image information of the positioning identifier. The image processing unit is used for calculating space position information according to the image information generated by the image pickup module and transmitting the space position information to the correcting unit; the correcting unit is used for carrying out correction on sensed data of the inertial sensor according to the space position information. The inertial positioning method comprises the steps of arranging the image pickup module and the positioning identifier which are separate, wherein the image pickup module is arranged at the correcting end and the positioning identifier is arranged at the inertial sensor end; or the positioning identifier is arranged at the correcting end and the image pickup module is arranged at the inertial sensor end; picking up the positioning identifier by utilizing the image pickup module, and calculating according to the pickup result to obtain the correction data; correcting the sensed data of the inertial sensor by utilizing the correction data. The inertial positioning method has the advantages of being short in correction time, accurate in correction, less in power consumption and the like.
Owner:SHENZHEN HEZHI CHUANGYING ELECTRONICS

Surface observation microseism speed model correcting method based on amplitude stack

ActiveCN105807316AAccurate correctionAmong the calibration methods, most of them are based on accurate perforation positioning.Seismic signal processingReverse timeSignal-to-noise ratio (imaging)
The invention relates to a surface observation microseism speed model correcting method based on amplitude stack.Starting from the principle of a reverse time migration amplitude stack method, a very fast simulated annealing method is combined, seismic phase first arrival information does not need to be picked up, and a speed model is corrected by monitoring the energy focusing condition on a perforation point; perforation point relocation accuracy is used for judging whether the speed model can be used for follow-up microseism location.The problem that the maximal value and the maximum value are not separated in an existing algorithm can be effectively solved, the maximum value E of energy focusing on the perforation point can be found accurately, the perforation position is located accurately, and the speed module is effectively corrected.Noise interference can be effectively inhibited by adopting the reverse time migration amplitude stack algorithm, and a good location effect can still be obtained with a low signal-to-noise ratio.The more the speed model is close to an actual model, the more accurate perforation location becomes.Whether the speed model can be used for follow-up microseism location or not is judged according to perforation point relocation accuracy.
Owner:JILIN UNIV

Method and apparatus for improving the accuracy of wind tunnel measurements in order to correct the influence of a suspension device

The invention relates to a method for improving the accuracy of wind tunnel measurements, especially for correcting the influence of a suspension device. According to said method, a model, particularly an aircraft model, is introduced into a wind tunnel on the suspension device that comprises several suspension wires, and at least one sleeve is mounted on one respective suspension wire. The inventive method comprises the following steps: at least two measurements are taken on the same model configuration at least at one respective effective diameter and/or the diameter of the suspension wire in order to determine at least two raw measured values and determine a corrected final measured value for the model from at least two raw measured values. According to a first embodiment of the disclosed method, the effective diameters of the suspension wires are reduced in at least three stages by removing mounted sleeves when detecting raw measured values of the drag coefficient of the model. A final measured value of the drag coefficient, which is corrected by the influence of the suspension device and the interference between the model and the suspension device, can be determined from the raw measured values using interpolation. According to another embodiment, the correction is made by forming the difference between only two raw measured values, one of which is determined from the diameter of the suspension wire without the mounted sleeves. The inventive method is suitable for correcting all aerodynamic parameters that can be measured in wind tunnels. The invention further relates to an apparatus for carrying out said method.
Owner:AIRBUS OPERATIONS GMBH
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