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89 results about "Earth remote sensing" patented technology
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Earth remote sensing is data collection on the environment, geology, climate, and other characteristics of the Earth by means of sensors positioned in the air or in Earth orbit. Sensors used for this type of data gathering include those covering all parts of the electromagnetic spectrum. Both passive and active techniques have been in common usage since the creation of the sensors themselves. Aerial surveying, LANDSAT mapping, satellite commercial Imaging, and spaceborne meteorology are all examples of Earth remote sensing.
Linear array SAR sparse reconstitution imaging and phase error correction method
ActiveCN103439693ASparse imaging suppressionImproving Sparse Reconstruction Imaging PerformanceRadio wave reradiation/reflectionSynthetic aperture radarCorrection method
The invention discloses a linear array SAR sparse reconstitution imaging and model phase error correction method. According to the characteristic that scattering targets are sparse in an actual linear array three-dimensional SAR imaging scene space, the linear array SAR sparse reconstitution imaging and model phase error correction method establishes a linear measurement matrix of linear array SAR original echo signals and scattering coefficients in a scene target space, phase error factors existing in the linear array three-dimensional SAR actual measurement are also taken into account, a scattering phase vector between a phase error matrix and a scene target is estimated through iterative optimization, imaging processing of the sparse targets in a linear array SAR three-dimensional space is realized, the effect on imaging by phase errors is restrained, and the stability of linear array SAR sparse reconstitution imaging and the imaging precision of a linear array SAR are improved. The linear array SAR sparse reconstitution imaging and model phase error correction method can be applied to synthetic aperture radar (SAR) imaging, earth remote sensing and other fields.
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA
Individual geological disaster emergency investigation method based on remote sensing of small unmanned aerial vehicle
InactiveCN105865427AReduce on-site work timeReduce intensityMeasuring points markingOptical detectionInvestigation methodsEngineering
The invention relates to an emergency investigation method for a single geological disaster based on remote sensing of a small unmanned aerial vehicle. The technical steps include: customization of small UAV remote sensing system; indoor preparation; field operation; rapid processing; comprehensive processing. The purpose is to carry out fast and effective image control point layout and measurement based on slope characteristics, and at the same time use a small unmanned aerial vehicle remote sensing system to automatically collect photos of the slope, and generate the slope by introducing image control points in the process of digital photogrammetry. The high-precision and high-resolution remote sensing results are obtained, and then the slope deformation detection and calculation are carried out on the two-phase remote sensing results that have passed the precision inspection and high-precision registration, so as to obtain the overall deformation characteristics of the slope quickly, efficiently and accurately.
Owner:CHINA THREE GORGES UNIV
Systems and methods for remote sensing of the earth from space
InactiveUS20180172823A1More opportunityIncrease opportunitiesCosmonautic vehiclesCosmonautic partsNatural satelliteGround station
A constellation of satellites may include a plurality of satellites in each of two or more different orbits. Satellites in a given orbit may operate in pairs, flying in tandem, one satellite leading, the other trailing closely behind, to be positioned to image the same target(s) of interest with substantially the same orientation (geographical coincident) at substantially the same time (temporally coincident). The first satellite may acquire SAR data, determine a location of a target of interest, assess cloud cover, and based on an extent of cloud cover, can acquire additional SAR data or cause the second satellite to capture optical imaging data (e.g., cross-cueing). Selection of orbits can provide a relatively high revisit rate may be obtained, allowing frequent opportunities to image given locations on a planet (e.g., Earth). One or more ground stations communicate with the constellation of satellites, and inter-satellite communications may be employed.
Owner:URTHECAST CORP +1
Bayesian fitering-based general data assimilation method
InactiveCN102737155AFast operationSimulator controlSpecial data processing applicationsValue setProcess information
The invention discloses a bayesian fitering-based general data assimilation method. The method comprises the steps of: inputting an initial value set into an analysis model in a prediction step so as to obtain a prediction set value; calculating prediction error covariance matrix by using set kalman filtering in an updating step, and updating each prediction set according to the observation value and kalman gain matrix; or, calculating importance weight of each set sample by adopting particle filtering through set prediction value, calculating the number of effective particles by utilizing normalization importance, resampling the set according to the weight to obtain updated analysis value and analysis set; or, calculating prediction error covariance matrix by adopting unscented kalman filtering, and updating each prediction set according to the observation value and kalman gain matrix; conducting next prediction and assimilation by taking the updated analysis set as the initial values of the analysis model, and repeating the prediction step and the updating step. The method can enable Earth remote-sensing observation information and land surface process model information to be effectively integrated, thus forming a land surface process information prediction system with small errors.
Owner:COLD & ARID REGIONS ENVIRONMENTAL & ENG RES INST CHINESE
Shift variant mode double-base synthetic aperture radar imaging method
ActiveCN101369017ASolving Imaging ProblemsRadio wave reradiation/reflectionSynthetic aperture sonarFourier transform on finite groups
The invention provides an imaging method for a shift-variant mode Bistatic Synthetic Aperture Radar (Bistatic SAR) based on inverse variable metric Fourier transform, and the method aims at the characteristic that the resolution of the shift-variant mode Bistatic Synthetic Aperture Radar (Bistatic SAR) changes by time, and uses variable metric Fourier transform to eliminate the adverse effect brought to the imaging of the Bistatic Synthetic Aperture Radar (Bistatic SAR) by the resolution of the shift-variant mode Bistatic Synthetic Aperture Radar (Bistatic SAR) changing by time, so as to use less calculation to achieve the imaging of the shift-variant mode Bistatic Synthetic Aperture Radar (Bistatic SAR). The method solves the shift-variant mode Bistatic Synthetic Aperture Radar (Bistatic SAR) imaging problem, and is characterized in that the method uses less calculation to achieve the imaging of the shift-variant mode Bistatic Synthetic Aperture Radar (Bistatic SAR). The method can be applied to the fields of Synthetic Aperture Radar ( SAR) imaging, earth remote sensing and the like.
Owner:四川电子科技大学教育发展基金会
Hard threshold OMP (orthogonal matching pursuit)-based linear array SAR (synthetic aperture radar) sparse imaging method
ActiveCN103698763AImproving Sparse Imaging PerformanceRadio wave reradiation/reflectionSynthetic aperture sonarRadar
The invention provides a hard threshold OMP (orthogonal matching pursuit)-based linear array SAR (synthetic aperture radar) sparse imaging method. A linear measurement matrix of original echo signals of a linear array SAR and scattering coefficients in a target space of an observed scene is established for the characteristic that main scattering targets are spatially sparse in the target space of the observed scene of the linear array SAR, and contrast between maximum and minimum target scattering coefficients and a target scattering coefficient change rate are used as iteration ending conditions for the iteration processing of a hard threshold OMP algorithm, so that the dependence of a conventional OMP algorithm on the number of the main scattering targets in linear array SAR sparse imaging is overcome. Compared with a conventional OMP algorithm-based linear array SAR sparse imaging method, so that the method has the advantages that the number of the main scattering targets in the target space of the observed scene is not required to be known, and the method is more applicable to the linear array SAR sparse imaging when the number of the main scattering targets is unknown under actual conditions; the imaging accuracy of the linear array SAR is improved. The method can be applied to the fields of SAR imaging, earth remote sensing and the like.
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA
Multi-stage attitude control method for remote sensing micro-nano satellite
ActiveCN109823571ASatisfy attitude control requirementsFast mobile responseSpacecraft guiding apparatusMicro nanoMomentum
The invention relates to a multi-stage attitude control method for a remote sensing micro-nano satellite, and belongs to the technical field of spacecraft attitude control. A three-axis magnetic moment device and a momentum wheel set are adopted as an attitude control execution component, and the attitude control method for the four main stages of recemization after satellite-rocket separation, counterglow capture, counterglow orientation and counter-earth remote sensing is designed, and an attitude mobile control method for the two stages of counterglow orientation and counter-earth remote sensing is designed. According to the recemization stage, the large angular rate of the satellite obtained after satellite-rocket separation is eliminated, and the basic controlled attitude is built; inthe counterglow capture and counterglow orientation stages, it is ensured that a sun sailboard is in the charging state for a long time; in the counter-earth remote sensing stage, it is ensured thatthe remote sensing photographing task is completed. According to the method, traditional PD control is adopted as the foundation, on the basis of feedforward control, quaternion is used for representing attitude errors, the method has the advantages of being rapid in satellite maneuvering response, high in steady state robustness and high in control precision, and the task requirement for a remotesensing micro-nano satellite is met.
Owner:TSINGHUA UNIV
Linear array SAR (Synthetic Aperture Radar) three-dimensional imaging method based on threshold gradient tracking algorithm
ActiveCN107037429AImproving Sparse Imaging PerformanceRadio wave reradiation/reflectionSynthetic aperture sonarTotal blood
The invention provides a linear array SAR (Synthetic Aperture Radar) three-dimensional imaging method based on a threshold gradient tracking algorithm. The method comprises the steps of establishing a linear measurement model between linear array SAR original echo signals and a three-dimensional observation scene target scattering coefficient using a correlation among linear array SAR system parameters, motion platform parameters, space parameters of an observation scene target and original echo signals, and then reconstructing the observation scene target scattering coefficient using a TBGP (Total Blood Granulocyte Pool) method based on the signal linear measurement model. By using the contrast of maximum and minimum target scattering coefficients and the change rate of the target scattering coefficient as algorithm iteration termination conditions, the linear array SAR sparse imaging performance of a GP (Genetic Programming) algorithm under the condition that the sparsity of the observation scene is unknown is improved, the operation efficiency and the space storage efficiency are improved relative to an OMP (Orthogonal Matching Pursuit) algorithm, and the method can be applied in the fields of synthetic aperture radar imaging, earth remote sensing and the like.
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA
Method for inhibiting radio frequency interference of synthetic aperture radar on basis of neural network
InactiveCN102608586AAvoid edge effectsSolve the accuracy is not highRadio wave reradiation/reflectionTime domainSynthetic aperture radar
The invention discloses a method for inhibiting radio frequency interference (RFI) of a synthetic aperture radar (SAR) on the basis of a neural network and belongs to the technical field of radar signal processing. Firstly, all global frequency domain characteristic values of an FRI signal are detected from frequency domain data of a SAR original echo; corresponding extended alternating projection neural network (EAPNN network) repository patterns are generated by the frequency domain characteristic values and are memoried into the EAPNN network one by one; then the RFI signal is associated from echo time domain data by utilizing an association function of the EAPNN network; and the echo time domain data is directly subtracted from the associated RFI signal so as to fulfill the aim of inhibiting the RFI. The EAPNN network combines the global characteristics and dynamic tracking characteristics, which are difficult to simultaneously consider in the existing method, and thus, on the premise of ensuring high inhibiting accuracy, a high processing speed can be obtained. The method can be widely used for the fields of the SAR, earth remote sensing and the like and is particularly suitable for places with high requirements on both the inhibiting accuracy and the processing speed and dense RFI.
Owner:中国人民解放军陆军军官学院
Frequency domain expansion based spaceborne/airborne hybrid bistatic synthetic aperture radar imaging method
InactiveCN102004250ASimple processReduce computationRadio wave reradiation/reflectionJet aeroplaneFrequency spectrum
The invention discloses a frequency domain expansion based spaceborne / airborne hybrid bistatic synthetic aperture radar imaging method. Firstly a spaceborne / airborne hybrid bistatic synthetic aperture radar oblique distance type model is built in any mode; then a two-dimensional frequency domain model is obtained by deduction; and then the phase item of the frequency spectrum is subject to Taylor expansion in fast time frequency and slow time frequency, and phase compensation is carried out, thus obtaining good focusing effect; and finally distortion is corrected, thus obtaining correct position of a target. The invention has the advantages that flow is simple, computation is less, and good focusing effect of target can be obtained in spaceborne and airborne platform high-angle diagonal flying mode and airplane squint mode; the invention can be used for imaging of large scene spaceborne / airborne hybrid bistatic synthetic aperture radar and is applicable to the fields of synthetic aperture radar imaging and earth remote sensing.
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA
GPU (graphic processing unit) implementing method based on backward projection InSAR (interfering synthetic aperture radar) imaging registration
InactiveCN102788979AGood phase retention performanceQuick buildRadio wave reradiation/reflectionSynthetic aperture sonarRadar
The invention discloses a GPU (graphic processing unit) implementing method based on backward projection InSAR (interfering synthetic aperture radar) imaging registration. The GPU implementing method based on the backward projection InSAR imaging registration comprises the following steps: projecting measured data of different antennae into the same imaging space for imaging by a backward projection algorithm; in the imaging process, performing high-phase-retention imaging and image registration on the different InSAR antennae and realizing integration of InSAR imaging and registration; and in combination of a GPU parallelizing technology, implementing fast processing of the backward projection algorithm. Compared with the conventional InSAR interference phase generation, the GPU implementing method based on the backward projection InSAR imaging registration has the advantages of good phase retention, integration of imaging and registration, improvement on algorithm efficiency through parallelization, and the like; by the GPU implementing method based on the backward projection InSAR imaging registration, quick generation of a high-precision InSAR interference phase is realized; and the GPU implementing method based on the backward projection InSAR imaging registration is applicable to the fields of synthetic aperture radar imaging, geochemical remote sensing and the like.
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA
Near-earth remote sensing satellite self-adaptive variable code modulation data transmission system and method
ActiveCN109379167AImprove data transfer performanceIncrease the amount of effective informationRadio transmissionChannel coding adaptationFrequency spectrumTransport system
The invention discloses a near-earth remote sensing satellite self-adaptive variable code modulation data transmission system and method, belonging to the field of satellite overall design. The invention provides a variable code modulation data transmission system and method based on a DVB-S2 protocol, which fully utilizes link resources for the near-earth remote sensing satellite data transmission, adopts a variable code modulation (VCM) system, fully utilizes the system link margin, and improves the satellite star-ground data transmission efficiency; and the optimal code modulation mode is selected by means of the DVB-S2 protocol under the condition of satisfying a bit error rate and the link margin, so that the amount of effective information transmitted per unit time is the largest. The near-earth remote sensing satellite self-adaptive variable code modulation data transmission method provided by the invention can maximize the adaptation to changing channel conditions and channel capacity due to orbital changes of the near-earth remote sensing satellite, and transmit more data information on a limited spectrum resource, which is very suitable for the data transmission of the near-earth remote sensing satellite to the ground.
Owner:BEIJING INST OF SPACECRAFT SYST ENG
High squint synthetic aperture radar imaging processing method
InactiveCN105093224AAchieve precise focusImproving Imaging AccuracyRadio wave reradiation/reflectionDoppler centroidRange migration
The invention discloses a high squint synthetic aperture radar imaging processing method, which comprises the steps of S1, calculating high squint synthetic aperture radar echo signals; S2, carrying out range fast Fourier transformation (FFT) and spatial-variant range walk correction on the echo signals, and removing range spatial-variant range walk; S3, carrying out range pulse compression and high-order range migration correction on the echo signals, and removing residual range migration; S4, carrying out azimuth spatial-variant property fitting of Doppler parameters on the echo signals; S5, balancing the Doppler centroid and the slope of frequency modulation of target points of the same range cell by adopting an extended azimuth nonlinear frequency modulation scaling algorithm; and S6, carrying out azimuth focusing so as to acquire an imaging result. The high squint synthetic aperture radar imaging processing method solves a range spatial-variant property and an azimuth spatial-variant property of the Doppler parameters, can realize precise focusing of monostatic SAR echo signals under a high-squint-angle condition, and can be widely applied to the fields of earth remote sensing, resource exploration, geological mapping, military reconnaissance and the like.
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA
Compact miniature snapshot spectral imaging detection device and detection method
ActiveCN107271039AEffective associationImprove time resolutionSpectrum investigationJitter noiseData acquisition
The invention discloses a compact miniature snapshot spectral imaging detection device and detection method. The device comprises a spectral image replication module and a data acquisition, processing and display system. The spectral image replication module comprises a micro-lens array, linear gradient filters and an area array detector which are arranged along the incident light direction in turn. The linear gradient filters are closely clung to the light sensing surface of the area array detector. The light sensing surface of the area array detector is arranged on the image surface of the micro-lens array and connected with the data acquisition, processing and display system. The arrangement direction of each row of lenses of the micro-lens array and the filtering wave line direction of the same wavelength in the linear gradient filters have an inclined angle. The device is suitable for detecting the spectral image information of a dynamic or fast change target so that the adverse influence caused by target change, jitter noise or environmental change and other factors can be effectively avoided, and the device has potential application value in the field of astronomical observation, space detection, earth remote sensing, machine vision and biomedical diagnosis.
Owner:XI AN JIAOTONG UNIV
Quick imaging method of linear array three-dimensional imaging synthetic aperture radar (SAR) based on sub-aperture approximation
InactiveCN101650435ARadio wave reradiation/reflectionThree-dimensional spaceSynthetic aperture radar
The invention provides a quick imaging method of a linear array three-dimensional imaging synthetic aperture radar (SAR) based on sub-aperture approximation. Aiming at the characteristic that an actual linear array three-dimensional imaging SAR echo only comprises echo signals of sparse scattering points in a three-dimensional space, the method adopts an aperture approximation technology to carryout imaging treatment on sparse targets in the three-dimensional space so as to better solve the problem of heavy computation of an imaging method of the three-dimensional imaging SAR. The invention has the advantage of realizing the linear array three-dimensional imaging SAR by utilizing smaller computation, and can be applied to the fields of SAR imaging, earth remote-sensing, and the like.
Owner:UNIV OF ELECTRONIC SCI & TECH OF CHINA
Method for constructing bistatic linear-array three-dimensional imaging synthetic aperture radar system
ActiveCN101666880ARadio wave reradiation/reflectionInterferometric synthetic aperture radarInverse synthetic aperture radar
The invention provides a method for constructing a bistatic linear-array three-dimensional synthetic aperture radar system. The method utilizes a principle of a synthetic aperture radar, combines thecharacteristics of high antenna phase center control accuracy in a linear-array three-dimensional synthetic aperture radar and anti-stealth, rich target scattering information and increased radar cross sectional area in the current bistatic synthetic aperture radar system, utilizes the characteristic of combining the bistatic synthetic aperture radar system with a linear-array system, and uses a single-feedback motivational pattern to reduce the power consumption and hardware complexity greatly, overcome a range ambiguity effect and realize three-dimensional imaging of an observed scene. The method realizes three-dimensional imaging of the bistatic linear-array synthetic aperture radar with a small data processing quantity with relatively low hardware cost. The method can be widely appliedin the fields such as synthetic aperture radar imaging, earth remote sensing and geological mapping.
Owner:四川电子科技大学教育发展基金会
Circular polarization hyperspectral image detection system
The invention relates to a hyperspectral image detection system capable of simultaneously acquiring left-hand and right-hand circular polarization components of a target. The system includes a pre-positioned collimation system, a double-refraction beam splitting system, an imaging lens and an image acquisition and processing system that are sequentially arranged in the direction of incoming rays. According to the invention, a double-channel circular polarization detection system is adopted to simultaneously acquire an interference figure of the left-hand and right-hand circular polarization components of a target, the detection system improves the capability of acquiring a difference circular polarization spectral image as compared with the single-channel polarization imaging spectrometer only capable of detecting a single linear polarization component, avoids quiver noise as compared with the sequence acquisition technology adopting a rotary component, can be used for acquiring the circular polarization spectral image of the target within a wide band range from the ultraviolet band to the infrared band, and has potential application values in the fields of space exploration, earth remote sensing, machine vision, biomedical diagnosis and the like.
Owner:XI AN JIAOTONG UNIV
Snapshot compact noise immunity type light field imaging full polarization spectrum detection device and method
InactiveCN106802184AEffective associationImprove time resolutionRadiation pyrometryPolarisation spectroscopyMachine visionData acquisition
The invention discloses a snapshot compact noise immunity type light field imaging full polarization spectrum detection device and method. The device comprises an object lens, a light field modulation unit, a micro-optical array, an area array detector and a data acquisition and processing display system. The object lens, the light field modulation unit, the micro-optical array and the area array detector are arranged in turn along an incident light direction. The light field modulation unit is arranged at the position of the aperture diaphragm of the object lens. The micro-optical array is arranged at the position of the image plane of the object lens. The area array detector is arranged on the rear focal plane of the micro-optical array and connected with the data acquisition and processing display system. The light field modulation unit comprises a polarization modulation module and a spectrum filter array. The device is suitable for detecting all light information of a dynamic or quick change target and can effectively avoid the adverse influence caused by the change of the target, jitter noise or the change of environment and other factors so as to have potential application value in the field of astronomical observation, space exploration, remote sensing of the earth, machine vision and biomedical diagnosis.
Owner:XI AN JIAOTONG UNIV
Town information extraction method based on Google Earth remote sensing image
InactiveCN103745453AEasy extractionEdge density generated reasonablyImage analysisCharacter and pattern recognitionSobel edge detectionExtraction methods
The invention discloses a town information extraction method based on a Google Earth remote sensing image. The method is characterized by, to begin with, performing pretreatment, such as median filtering and the like, on the remote sensing image; then, generating an edge image of the image based on a sobel edge detection operator; next, constructing a Gauss spatial domain weighting edge density generation operator and generating an edge density image; carrying out OSTU optimal threshold segmentation on the edge density image; and at last, carrying out aftertreatment on the segmentation image, and finally obtaining town information of the remote sensing image. The extraction method in the invention is good in effect, fast in speed, and high in accuracy, and is suitable for information extraction of towns, especially towns at the connection places of cities and suburbs.
Owner:HOHAI UNIV
Snapshot type full-polarization imaging detection device
InactiveCN103698014AEffective associationImprove time resolutionLight polarisation measurementOptical elementsData acquisitionImage detection
The invention discloses a snapshot type full-polarization imaging detection device, which can be used for acquiring two-dimensional spatial polarization information in real time. The snapshot type full-polarization imaging detection device consists of a front optical lens group, a full-polarization modulation module, an imaging lens group, an area-array detector and a data acquiring and processing system which are arranged in sequence along a light incidence direction. In the snapshot type full-polarization imaging detection device, the full-polarization modulation module consisting of three Wollaston prisms is adopted, the full-polarization information, including respective corresponding two-dimensional spatial images of 0-degree, 90-degree, + / -45-degree, levorotation and dextrorotation circular polarization components, of a detected target at a certain moment and at a certain detection azimuth angle can be obtained by snapshotting one frame of image, and a corresponding two-dimensional spatial graph of all Stokes polarization parameters can be obtained by processing with a simple algebra algorithm. The snapshot type full-polarization imaging detection device has a potential application value in the fields of astronomical observation, space exploration, earth remote sensing, machine vision, biomedical diagnosis and the like.
Owner:XI AN JIAOTONG UNIV
Same-orbit specific phase distribution constellation layout and orbit adjustment method and device based on Hohmann orbital transfer, and computer storage medium
ActiveCN111301715AGuaranteed on-orbit operating lifeGuaranteed operating lifeArtificial satellitesSpacecraft guiding apparatusOrbital decaySatellite constellation
The embodiment of the invention discloses a same-orbit specific phase distribution constellation layout and orbit adjustment method and device based on Hohmann orbital transfer, and a computer storagemedium. The method comprises the following steps: establishing an orbit injection motion model of an earth remote sensing satellite; analyzing an orbit attenuation factor of the earth remote sensingsatellite based on a preset perturbation factor; aiming at the earth remote sensing satellite constellation with specific phase distribution on the same orbit, designing a height adjustment strategy from an injection orbit to a calibration orbit and a phase initialization layout strategy of the constellation according to the orbit injection motion model; and determining the fuel quantity requiredby the earth remote sensing satellite under the designed service life at least according to one or more of the height adjustment strategy and / or the phase initialization layout strategy, phase maintenance and height maintenance for the orbit attenuation factor.
Owner:HARBIN INST OF TECH
Space target characteristic measurement and reconnaissance method based on micro-nano satellite group approaching reconnaissance
ActiveCN114169066ANew systemOutstanding military valueGeometric CADDesign optimisation/simulationData sourceEngineering
The invention discloses a space target characteristic measuring and reconnaissance method for micro-nano satellite group approaching reconnaissance. The method comprises a task preparation stage and a task execution stage, the task preparation stage comprises the following steps: taking space target characteristic measurement as a target, combining the maneuvering capability and the load detection capability of a micro-nano satellite, decomposing a working task target and capability requirements of a single satellite, and constructing a satellite group based on the working task target and the capability requirements; the task execution stage comprises migration maneuvering, approaching reconnaissance and the like. According to the invention, an inter-satellite intelligent, cooperative and autonomous working mode demonstration is established, the method can be popularized and applied to the fields using formation / satellite group / constellation, such as on-orbit maintenance, space-based communication and earth remote sensing, and the modes and methods of measurement, control and working of space satellites in the future are greatly changed; space target characteristic measurement is carried out through star group approaching reconnaissance, a task execution work flow is given and serves as a novel data source of target characteristics, in-orbit view angle target characteristic information urgently needed by space application can be provided, the blank of target characteristic information acquisition in related fields is filled in time, and the target characteristic information acquisition efficiency is improved. And the capability of entering the space and utilizing the space is greatly improved.
Owner:NO 63921 UNIT OF PLA
Rapid frequency-domain backward projection three-dimensional imaging method based on GPU
ActiveCN108008389AImprove operational efficiencyRealize 3D ImagingRadio wave reradiation/reflectionGraphicsFrequency spectrum
The invention discloses a rapid frequency-domain backward projection three-dimensional imaging method based on a GPU. The method is characterized by based on a parallel processing ability of the GPU,using a three-dimensional frequency-domain backward projection algorithm, using a graphic processing unit GPU and adopting a single-program multi-data instruction mode to schedule abundant hardware resources so that one thread in the graphic processing unit GPU is responsible for one frequency spectrum grid point; in each thread, calculating backward projection values of current frequency domain grid points in all array directions in parallel and accumulating; and finally, through three-dimensional inverse Fourier transform, acquiring a three-dimensional SAR image. Operation efficiency of a backward projection algorithm is greatly increased. Compared with the prior art, the method possesses high operation efficiency and a three-dimensional imaging characteristic of a linear array SAR is realized. The method is suitable for synthetic aperture radar imaging, earth remote sensing and other fields.
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA
Microwave staring correlated imaging earth observation method
The invention discloses a microwave staring correlated imaging earth observation method based on coordination of a geostationary satellite and an aerostat platform. The method comprises steps: through a transmitting and receiving-integrated microwave staring correlated imaging system in a geostationary satellite platform, one-time microwave staring correlated imaging is carried out, a large-range low-resolution imaging result of an observation area is obtained, and a key target area is determined; and wide area bistatic and task coordinated-type secondary microwave staring correlated imaging based on the geostationary satellite platform and the aerostat platform for synchronous receiving is used, and a high-resolution imaging result for the key target area is finally obtained. All-day, all-weather, wide-range and low-resolution observation and investigation and small-range hotspot area key target high-resolution microwave staring imaging can be realized, and the method is applicable to earth remote sensing application scenes such as military battlefield investigation and earthquake relief and disaster relief.
Owner:UNIV OF SCI & TECH OF CHINA
Fourier transform infrared imaging spectrometer based on multistage micro-reflector
ActiveCN103913234AEliminate moving partsImprove reliabilityRadiation pyrometryInterferometric spectrometryFast Fourier transformShaped beam
Owner:CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
Electric distribution network geographic information obtaining method based on Google Earth remote sensing image
InactiveCN102222311AHigh resolutionIn line with the habit of daily monitoringData processing applicationsSpecial data processing applicationsElectric networkElectric distribution network
The invention discloses an electric distribution network geographic information obtaining method based on a Google Earth remote sensing image, comprising a Google Earth remote sensing image obtaining part and a geographic labeling obtaining part. A remote sensing image automatic screenshot with arbitrary resolution ratio can be realized through Google Earth, geographic coordinates of the image can be automatically obtained, coordinate conversion is carried out and is displayed on an electric network geographic information obtaining system; various types of KML (keyhole markup language) files labeled geographically are obtained through the Google Earth, and format conversion is carried out and is displayed on the electric network geographic information obtaining system. By adopting the method, intuitive and clear geographic background based on the Google Earth remote sensing image can be provided for the electric network management, so as to provide powerful technical support for services of an electric distribution network, such as maintenance, scheduling, operation and overhauling and the like.
Owner:DONGFANG ELECTRONICS
Method for improving resolution of linear-array three-dimensional imaging synthetic aperture radars
ActiveCN101666879AEnable high-resolution imagingRadio wave reradiation/reflectionHigh resolution imagingImage resolution
The invention provides a method for improving the resolution of linear-array three-dimensional imaging synthetic aperture radars. The method adopts two linear-array three-dimensional imaging syntheticaperture radars with orthogonal motion tracks for imaging of the same region, and then blends two acquired images by discrete wavelet transform technology so as to obtain a linear-array three-dimensional imaging synthetic aperture radar image with high resolution. The invention has the following advantages of realizing high-resolution imaging of the linear-array three-dimensional imaging synthetic aperture radars by using a relatively short array antenna and solving the problem of relatively low tangential track resolution of images acquired by the linear-array three-dimensional imaging synthetic aperture radars. The method can be widely applied in the fields such as synthetic aperture radar imaging, earth remote sensing and geological mapping.
Owner:四川电子科技大学教育发展基金会
Method for merging resolutions of linear array three-dimensional imaging synthetic aperture radars
ActiveCN101614810AEnable high-resolution imagingRadio wave reradiation/reflectionHigh resolution imagingImage resolution
The invention provides a method for merging resolutions of linear array three-dimensional imaging synthetic aperture radars. The method adopts two linear array three-dimensional imaging synthetic aperture radars of which the motion trails are orthogonal to image the same region and then adopts an orthogonal spatial projection matrix technology to merge two obtained images, thereby generating a high-resolution linear array three-dimensional imaging synthetic aperture radar image. The method solves the problem that the cross track resolution of the linear array three-dimensional imaging synthetic aperture radar image is lower than the long track resolution of the linear array three-dimensional imaging synthetic aperture radar image. The method has the advantages of realizing the linear array three-dimensional imaging synthetic aperture radar high-resolution imaging by using a short array antenna and can be used in the fields of synthetic aperture radar imaging, earth remote sensing and the like.
Owner:四川电子科技大学教育发展基金会
Evaluation method based on transport diffusion model of soluble pollutants in water environment
ActiveCN111241758AImprove targetingImprove accuracyDesign optimisation/simulationProbabilistic CADData ingestionRiver network
The invention relates to an evaluation method based on a transport diffusion model of soluble pollutants in a water environment. A de Saint-Venant system of equations and a one-dimensional convectivediffusion equation are taken as the basis; branched point connections are set, a one-dimensional river network branch point model is established; the data is discretely converted into a linear equation set through a Preissmann four-point implicit format; based on the thought of a three-level joint solution, a pursuit method is applied to solve the recursion relation of spatial and temporal changesof pollutant concentration, initial and boundary conditions are substituted, unknown numbers are concentrated on a branched point, a hyper-relaxation iteration method is applied to solve the unknownnumbers of the branched point, and then the unknown numbers are substituted into each single direct-current river reach to be solved respectively. Aiming at the condition of insufficient support of generalized section data, the method creatively combines Google Earth remote sensing with an image processing technology, designs a reasonable and feasible data extraction method, obtains basic data, and calculates necessary hydraulic parameters of a river network model through a hydraulic formula; in the aspect of parameter calibration, an improved Bayesian-MCMC method is adopted to calibrate the parameters of the model.
Owner:LIREN COLLEGE OF YANSHAN UNIV
Linear array three-dimensional imaging synthetic aperture radar fast imaging method
The invention provides a linear array three-dimensional imaging synthetic aperture radar rapid imaging method based on multiresolution approach, which aims at the characteristic that an actual linear array three-dimensional imaging synthetic aperture radar echo only contains echoed signals with certain curved signal in a three-dimensional space, and adopts the multiresolution approach technique to carry out imaging processing for a certain curved surface in the three-dimensional space. The invention solves the problem that the calculating amount of a three-dimensional imaging synthetic aperture radar imaging method is large. Compared with the prior three-dimensional imaging synthetic aperture radar imaging calculation, the invention utilizes less calculating amount to realize linear array three-dimensional imaging synthetic aperture radar. The invention can be applied to the fields of synthetic aperture radar image, earth remote sensing, and the like.
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA
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