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63 results about "Satellite radar" patented technology
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Multi-objective optimization for real time traffic light control and navigation systems for urban saturated networks
ActiveUS9076332B2Reduce traffic congestion loadReduce loadControlling traffic signalsDetection of traffic movementGreen timeNavigation system
A multiobjective management system for saturated traffic road networks comprising: green wave coordination of locally adaptive traffic control units, traffic movement optimization and live traffic route guidance. Current traffic congestion measurements on intersections are generated from local traffic cameras and remote air-borne conventional cameras and thermal sensing imaging cameras or satellite radar such as SAR / ISAR using optical image brightness analysis. At the first stage of traffic optimization, individual local intersection green times are computed based on current traffic congestion level. At the second stage optimization, the central traffic server uses a multiobjective approach to coordinate the current locally-optimized green times of the first stage and create input constraints for green-way coordination of plurality of traffic lights. The server updates dynamically current cycle start and green times on all network-connected traffic light controllers and also broadcasts recommended travel times, green times and green waves to all on-line client vehicle navigation units. Traffic server and individual client guidance units utilize novel time-dependent modifications of an A*-type algorithm to update current travel and recommended travel times and to execute fastest route searches.
Owner:MAKOR ISSUES & RIGHTS
Method and device for monitoring surface deformation and data processing equipment
InactiveCN102680972ASolve the costSolve the accuracy problemRadio wave reradiation/reflectionRadarData information
The invention discloses a method and a device for monitoring surface deformation and data processing equipment. The method comprises the following steps: obtaining satellite radar images of a target area; obtaining pixels of the satellite radar images of the target area; obtaining an interferogram of the target area by applying complex operation to the pixels; and obtaining the surface deformation data of the interferogram. According to the invention, the interferogram, which is obtained from the pixel data of the satellite radar image data sent by the satellite, contains data information representing surface deformation and other data information, and the data information representing surface deformation can be obtained by filtering other information, so as to quickly and accurately detect the sedimentation effect of a mining area.
Owner:CHINA SHENHUA ENERGY CO LTD +1
Satellite radar inversion fusion method based on NRIET machine learning
ActiveCN108445464AFill in unobservable areasImprove accuracyWave based measurement systemsNeural architecturesSatellite dataEmissivity
The invention discloses a satellite radar inversion fusion method based on NRIET machine learning. The method comprises a training phase and an inversion phase. The training phase includes satellite data and processing: subjecting the disc projection data of four waveband including B08, B10, B13 and B15 of a sunflower No. 8 geostationary satellite to projection conversion and interpolating the same to a spatial grid point of 0.02*0.02 degree; lightning data and processing; radar data and radar data networking; land use type data and processing; and model training. The inversion phase includes:data preprocessing: subjecting the sunflower No. 8 geostationary satellite data obtained by real-time observation and the lightning data to the same processing as the training phase, the land use type data using the data processed in the training phase; the radar data networking: subjecting the radar-base data observed in real time to networking according to the networking steps in the training phase to calculate the combined emissivity; radar echo inversion; and satellite radar data fusion.
Owner:NANJING NRIET IND CORP
SAR satellite radar echo simulation method and system and medium
ActiveCN107765226AHigh precisionImprove stabilityWave based measurement systemsMathematical modelPoint target
The invention provides an SAR satellite radar echo simulation method and system and a medium. The method is characterized by, according to attitude information transmitted by a satellite in real time,determining current antenna pointing of the satellite; obtaining satellite position, speed and acceleration information by searching a PVT table, and carrying out interpolation calculation to obtainthe position of the satellite at the current time; calculating the distance between the satellite and a ground simulation target and due gain of a current target echo; establishing an echo signal mathematical model of a space-borne SAR point target; and through superposition of target echo models of a plurality of points, generating an echo signal of a space-borne SAR scene, and finally, obtainingSAR satellite echo signal data. The method improves truthfulness of SAR echo simulation; and through an SAR scene generation method based on multipoint target superposition, different types of scenescan be generated more quickly.
Owner:BEIJING INST OF SPACECRAFT SYST ENG
Tracking-type active radar calibrator based on transmitted signal reestablishing system
ActiveCN103454620AReduce layout requirementsFlexible layoutWave based measurement systemsFrequency synthesizerRadio frequency signal
The invention relates to a tracking-type active radar calibrator based on a transmitted signal reestablishing system. The tracking-type active radar calibrator comprises a servo unit (1), a radio frequency receiver (2) and a radio frequency transmitter (5). The tracking-type active radar calibrator further comprises a tracking device (3), a signal reestablishing device (4) and a frequency synthesizer (6), the tracker (3) is respectively connected with the radio frequency receiver (2), the frequency synthesizer (6) and the signal reestablishing device (4), and the signal reestablishing device (4) is further connected with the frequency synthesizer (6) and the radio frequency emitter (5). The tracking-type active radar calibrator can quickly capture tracking radar signals and reestablish radio frequency signals so as to send the signals to an on-orbit satellite radar, and realize the functions that at any position within the coverage range of the satellite radar signals, the radar signals can be captured and tracked quickly, signal emission time can be accurately set according to received signal intervals, and the radio frequency signals are reestablished to be sent to the radar.
Owner:NAT SPACE SCI CENT CAS
Remote sensing classifying method for sea ice types
The invention relates to a remote sensing classifying method for sea ice types. Polar region sea ice are sorted by adopting satellite radar height gauge Cryosat-2 data, so that large-scale sea ice classification based on novel means is implemented. The method includes steps of acquiring longitude and latitude coordinates of measurement points and corresponding radar echo waveforms from the heightgauge Cryosat-2 data and extracting related features of echo waveforms; downloading AARI sea ice type data and extracting sea ice type information at the corresponding measurement points; performing geographic matching on the above extracted data information and converting the data information to point data with longitude and latitude coordinates through MATLAB programming; taking the acquired waveform features of the points and the corresponding sea ice types as training data and training by utilizing a random forest classifier, performing sea ice classification on to-be-classified data; performing treatment including projection conversion, grid transformation and the like in ArcGIS on data subjected to classification and acquiring a sea ice type data set having a spatial resolution of 25km.
Owner:NANJING UNIV
Corn biomass inversion calculation method based on satellite radar remote sensing data
ActiveCN110287457ASolve the problem of large volatility of learning regressionAchieve precisionGeographical information databasesComplex mathematical operationsMeasurement pointSynthetic aperture radar
The invention discloses an inversion calculation method based on satellite radar remote sensing data. The invention belongs to the technical field of satellite remote sensing image processing and application. The objective of the invention is to overcome the defects of high artificial subjective factor, high algorithm complexity, high requirement on actual measurement point information and the like in corn biomass inversion by using a synthetic aperture radar remote sensing image in the prior art. The method comprises the following steps: preprocessing an image; firstly, extracting VH and VV polarization backscattering coefficients corresponding to corn biomass on-site measurement points; acquiring a water cloud model through a fitting mode; substituting the corn biomass with a plurality of selected points into the model water cloud to obtain a plurality of VH and VV polarization backscattering coefficients; and training by adopting a random forest algorithm to obtain a regression model of the mapping relation between the characteristic matrix and the label value, and inputting the VH and VV polarization backward scattering coefficients of the to-be-measured point into the model to measure and calculate the corn biomass of the measurement point.
Owner:JILIN UNIV
High-bearing and low-friction suspension type antenna unloading device
ActiveCN109515770AReduce processing difficultyReduce pipeline complexityCosmonautic condition simulationsLow frictionGravitation
The invention provides a high-bearing and low-friction suspension type antenna unloading device. The high-bearing and low-friction suspension type antenna unloading device comprises long air flotationguide rails, short air flotation guide rails, an air supply and distribution system, a double-suspension-bar suspension assembly and a bearing truss. The long air flotation guide rails are arranged on the bearing truss and driven by the air supply and distribution system to move relative to the bearing truss. The two ends of each short air flotation guide rail are arranged on the two corresponding long air flotation guide rails correspondingly, and the short air flotation guide rails are driven by the air supply and distribution system to move relative to the long air flotation guide rails. The double-suspension-bar suspension assembly is connected with the two ends of each short air flotation guide rail in a sliding mode, driven by the air supply and distribution system to move relativeto the short air flotation guide rails and used for achieving suspension of load antennas. By the adoption of the high-bearing and low-friction suspension type antenna unloading device, the long air flotation guide rails and the short air flotation guide rails are driven by the air supply and distribution system, so that linear movement of the double-suspension-bar suspension assembly in the orthogonal direction of the long guide rails is achieved. The double-suspension-bar suspension assembly is connected with satellite radar antennas, so that gravity unloading of the satellite radar antennasis achieved.
Owner:SHANGHAI AEROSPACE SYST ENG INST
Method for accurately calculating surface subsidence amount of coal mining subsidence area by using INSAR
ActiveCN111076704AEasy to integrateHeight/levelling measurementElectrical/magnetic solid deformation measurementEarth surfaceSurface water
The invention discloses a method for accurately calculating a surface subsidence amount of a coal mining subsidence area by using INSAR, and belongs to the field of satellite radar measurement. The method comprises the following steps: calculating and acquiring the surface subsidence amount and a ground surface horizontal movement amount in a goaf mining influence range according to information ofgoaf geological mining conditions; and then calculating a vector orientation of horizontal movement according to the horizontal movement amounts in an X direction and a Y direction, determining an included angle with an X axis, and resolving a deformation amount of a satellite radar in a visual direction by combining a relative position relationship between a satellite radar measurement point anda monitoring target to obtain the subsidence amount of the monitoring target. Aiming at defects in the prior art, the invention provides the method for calculating the subsidence amount of the pointby utilizing a displacement amount, which is obtained through monitoring by a single satellite, of the target point in the visual direction, and an InSAR monitoring result can be linked with an existing mining subsidence theory so that an InSAR technology and the mining subsidence theory can be better fused and mutually promoted.
Owner:CCTEG CHINA COAL RES INST
Pavement collapse detection method
ActiveCN113325419ASolve the problem of refined detectionQuick analysisRadio wave reradiation/reflectionEnvironmental engineeringRoad surface
The invention provides a pavement collapse detection method. The pavement collapse detection method adopts an L-band InSAR satellite radar and a double-frequency high-dynamic ground penetrating radar to be combined for use. The pavement collapse detection method comprises the following steps: S1, acquiring soil water content and humidity data of a pavement detection area by using an L-band InSAR satellite radar, and finding out a soil water content abnormal area after processing; and S2, using a double-frequency high-dynamic ground penetrating radar to collect the burying depth data of the underground target body in the soil water content abnormal region, and performing three-dimensional display on the real form of the underground target body after processing the data. According to the pavement collapse detection method, the underground water content can be detected and researched in a large range, underground hidden dangers can be rapidly and accurately analyzed, and a basis is provided for rapid early warning and quantitative regulation of road potential safety hazards.
Owner:HUNAN LIANZHI BRIDGE & TUNNEL TECH
Lake water storage variation monitoring method based on remote sensing
The invention discloses a lake water storage variation monitoring method based on remote sensing. The lake water storage variation monitoring method comprises the following steps: collecting and analyzing remote sensing data; extracting lake water body information based on an object-oriented method; extracting lake water level based on synthetic aperture radar height measurement data; establishinga relation model based on remote sensing lake area change-water level change; and estimating and researching the water quantity change of the lake in a long-time sequence. According to the lake waterstorage variation monitoring method based on remote sensing, multi-source water level data is not relied on, based on a long-time sequence lake area extracted from two kinds of optical remote sensingdata of Landsat and Keyhole satellites, based on single satellite radar altimetry data (Sentinel-3) in a limited time period, the water storage change of the lake in the past fifty years is estimated, and a new thought is provided for monitoring the long-time-sequence water volume change of the lake.
Owner:NANJING HYDRAULIC RES INST
Satellite radar altimetric waveform resetting method based on waveform derivatives
The invention discloses a satellite radar altimetric waveform resetting method based on waveform derivatives. The method comprises the steps that a first-order derivative and a second-order derivativeof an echo waveform are deduced based on a theoretical echo model; a computational formula of a leading edge midpoint is obtained by use of a waveform leading edge slope maximum value obtained when the second-order derivative is equal to zero; a fitting mode is utilized to solve unknown parameters in the computational formula of the leading edge midpoint, and the position of the leading edge midpoint is determined; a reset distance corrected value is determined according to a preset tracking gate; and sea surface height reset through the resetting method is further calculated according to thereset distance corrected value and an altimetric error corrected value. Through the method, the quality of satellite altimetric data can be improved, the precision of the reset sea surface height ishigher than that obtained through a conventional resetting method, and the correlation between the reset sea surface height and geoidal surface height is obviously improved.
Owner:SHANDONG UNIV OF SCI & TECH
Absolute calibration method for satellite radar altimeter without special calibration field
ActiveCN106885586ATo achieve geographically balanced distributionGuaranteed accuracyOpen water surveySatellite radio beaconingAbsolute calibrationData space
The invention relates to an absolute calibration method for a satellite radar altimeter without a special calibration field and belongs to the technical field of calibration of satellite altimeters. According to the method, an absolute deviation of the satellite radar altimeter can be determined through processing tidal observation data and satellite altimetry data of a satisfactory oceanographic station, adding essential correction entries such as a geoid model, carrying out height datum unification, altimetry data space position interpolation and tidal observation data time interpolation, and finally, carrying out difference comparison on sea surface height of tidal observation and sea surface height of the satellite radar altimeter. Compared with the prior art, the method has the advantages that the special calibration field is not required, the existing oceanographic stations can have calibration capability by using existing business observation data of oceanographic stations of coasts or oceanic islands of our country and a regional accurate geoid, and thus, absolute measured deviations of the satellite altimeters at home and abroad can be acquired.
Owner:THE FIRST INST OF OCEANOGRAPHY SOA
Deep learning-based stationary orbit meteorological satellite radar reflectivity factor inversion method
PendingCN113534158ALearn about strong convection systemsUnderstand intensityEnsemble learningDesign optimisation/simulationCycloneRadar reflectivity
The invention relates to the technical field of severe convection weather early warning, in particular to a deep learning-based stationary orbit meteorological satellite radar reflectivity factor inversion method. The method comprises the following steps: selecting a sensitive channel of a geostationary orbit meteorological satellite imager according to a random forest method, wherein the sensitive channel is a channel with strong correlation with a radar reflectivity factor; and receiving sensitive channel data downloaded by the geostationary orbit meteorological satellite imager, and inputting the sensitive channel data into the pre-established and trained radar reflectivity factor inversion model to obtain an inversion result. According to the method, basic detection and diagnosis data are provided for disastrous weather in a radar uncovered area, and the beneficial effects of a severe convection system incompletely covered by radar data and typhoon cyclone strength distribution can be intuitively understood; therefore, the time interval can be shortened, and monitoring of a convection system which develops rapidly is facilitated; besides, the method has higher nonlinear reconstruction capability and higher inversion precision.
Owner:NAT SATELLITE METEOROLOGICAL CENT
A sea ice type remote sensing classification method based on convolution neural network
InactiveCN109359631AEasy accessHigh spatio-temporal resolutionScene recognitionGeographical information databasesOpen waterMeasurement point
The invention discloses a sea ice type remote sensing classification method based on a convolution neural network, and belongs to the field of remote sensing geoscience application technology. The method uses satellite radar altimeter data to classify sea ice (divided into multi-year ice, one-year ice and open water). The steps include obtaining longitude and latitude coordinates of measurement points from altimeter data and radar echo waveform; downloading the sea ice type data and extracting the sea ice type information at the corresponding measurement point. The extracted data information is spatially matched and converted into vector point data with longitude and latitude coordinates. The radar echo waveform and the corresponding sea ice type are used as training data to train the convolution neural network, and the radar echo waveform to be classified is used to identify the sea ice type. After classification, the sea ice types are marked on the vector data. The tagged vector dataare processed by projection transformation, raster transformation and spatial resampling to obtain the sea ice type of the whole study area.
Owner:NANJING UNIV
Flood and field compatible satellite radar height-finding instrument tracker
InactiveCN101178436ASuitable for measurementImprove tracking accuracyHeight/levelling measurementRadio wave reradiation/reflectionDiscriminatorElectricity
The invention discloses a satellite radar altimeter tracker compatible of sea and land, which comprises a first FFT power analyzer, an MLE error discriminator, a first Alpha-Beta filter, a second FFT power analyzer, an OCOG error discriminator, a second Alpha-Beta filter and a data composing treatment unit; wherein, the first FFT power analyzer is electrically connected to the MLE error discriminator, the first Alpha-Beta filter and the data composing treatment unit. The MLE error discriminator is respectively connected with the first Alpha-Beta filter and the data composing treatment unit electrically. The first Alpha-Beta filter is electrically connected with the data composing treatment unit. The second FFT power analyzer is electrically connected with the OCOG error discriminator, and the second Alpha-Beta filter and the data composing treatment unit. The OCOG error discriminator is respectively connected with the second Alpha-Beta filter and the data composing treatment unit electrically. The second Alpha-Beta filter is electrically connected with the data composing treatment unit. The first Alpha-Beta filter is also electrically connected with the second Alpha-Beta filter.
Owner:CENT FOR SPACE SCI & APPLIED RES
Correction method for sea wave significant wave height of satellite radar altimeter and related device
ActiveCN111736148AHigh precisionGeographical information databasesSpecial data processing applicationsSea wavesRadar altimeter
The embodiment of the invention provides a correction method for the sea wave significant wave height of a satellite radar altimeter and a related device, and relates to the field of ocean detection.The method comprises the following steps: acquiring satellite radar altimeter data, wherein the satellite radar altimeter data comprises sea wave significant wave height, a backscattering coefficientand a backscattering coefficient standard deviation; and correcting the satellite radar altimeter data by using a pre-trained radar altimeter data correction model to obtain corrected sea wave significant wave height, wherein the radar altimeter data correction model is obtained by training based on the historical sea wave significant wave height, the historical backscattering coefficient, the historical backscattering coefficient standard deviation and the historical buoy observation sea wave significant wave height. The embodiment of the invention has the beneficial effects that the data ofthe satellite radar altimeter can be corrected, and the precision of the sea wave significant wave height in the data of the satellite radar altimeter is improved, so that the application value of thedata of the satellite radar altimeter is effectively improved.
Owner:国家海洋环境预报中心 +1
Heterogeneous distributed detection information target identification optimization method based on threat assessment
ActiveCN111102882AResolve uncertaintySolve the problem of ambiguityDefence devicesWave based measurement systemsRadarControl system
The invention discloses a heterogeneous distributed detection information target identification optimization method based on threat assessment, which is applied to an attack and defense countermeasuresystem simulation system. The method is characterized in that a heterogeneous distributed sensor network is formed based on signal-level semi-physical systems such as multiple satellites and multipleradars, the property of an attacking target is evaluated to form a threat sequence, and a ground command control system schedules the satellites and the radars to preferentially track and identify ballistic missile targets with high threat values according to the threat values in the threat sequence, and finally an interception or striking sequence is determined according to a target identification result. According to the method, redundant and complementary information fusion is carried out on collected detection information, target and environment information is collected and processed to agreater extent, accuracy and reliability of battlefield target identification are improved, and therefore the method is of great significance in subsequent situation evaluation, threat estimation andinterception strategy formulation, and the winning probability in confrontation simulation is greatly improved.
Owner:CHINA ACAD OF LAUNCH VEHICLE TECH
Anisotropic sea surface radar back scattering simulation method and system
The invention provides an anisotropic sea surface radar back scattering simulation method and system. The method comprises the steps of: observing a data sample according to a plurality of satellite radars, carrying out fitting calculation on parameters in a to-be-configured anisotropic sea surface radar back scattering model which is established on the basis of a small slope approximation method,so as to obtain a configured anisotropic sea surface radar back scattering model, in the model, expressing asymmetric influences, on radar back scattering coefficients, of along wind and dead wind through a deflection function, and expressing autocorrelation of a sea surface height by adoption of an index-like type function; and obtaining data of a to-be-simulated field, and calculating and outputting a target radar back scattering coefficient corresponding to the data of the to-be-simulated scene according to the configured anisotropic sea surface radar back scattering model. According to the method and system, the characteristics of anisotropic sea surfaces can be truly reflected, and the calculation precision and calculation efficiency are both reasonably considered, so that the methodand system have important application value in the aspects of satellite-borne radar parameter design, sea surface wind field inversion and the like.
Owner:中国人民解放军61741部队
Flood coverage extraction method based on remote sensing image
ActiveCN112700431AExtraction is fast and preciseAlgorithm ideas are clear and intuitiveImage enhancementImage analysisRadar remote sensingImaging data
The invention provides a flood coverage extraction method based on a remote sensing image, and the method comprises the following steps: S1, obtaining land satellite optical remote sensing image data, calculating the historical water body distribution probability, and obtaining a perennial water area range distribution map through setting a distribution probability threshold value; s2, acquiring satellite radar remote sensing image data, calculating statistical information of each pixel time domain within a set time range, and calculating a current water area distribution diagram by adopting a statistical threshold method; and S3, classifying the flood coverage types in combination with the perennial water area and the current water area range, and extracting the flood coverage ranges of different levels at present. The flood coverage range is extracted by combining historical and current water distribution, and the current flood coverage range can be rapidly and accurately obtained.
Owner:WUHAN UNIV
Rainfall quality control and evaluation method fused with satellite radar multi-source data and application
PendingCN114298162AIncrease the level of automationShorten application timeCharacter and pattern recognitionSatellite dataRadar
The invention discloses a precipitation quality control and evaluation method fused with satellite radar multi-source data and application. The method comprises the following steps: acquiring satellite data, radar data and ground rainfall data, and defining a quality control reference domain, a quality evaluation reference domain, a real-time abnormal event and a quasi-real-time abnormal event; marking abnormal sites in the ground rainfall data, calculating quality control factors and weather backgrounds of the abnormal sites so as to identify real-time abnormal events, and marking whether data corresponding to the real-time abnormal events is correct or not; and obtaining ground precipitation data and a quality marking result of a quality evaluation reference domain corresponding to the to-be-evaluated site, calculating a quality evaluation factor of the to-be-evaluated site, and identifying a quasi-real-time abnormal event according to the quality evaluation factor. When rainfall quality control and evaluation are carried out, satellite data and radar data are introduced, the automatic identification level of real-time quality abnormal events is improved, a mutual feedback mechanism between processing of different quality problem events is achieved, and the effect is good.
Owner:湖北省气象信息与技术保障中心
Circularly polarized antenna
InactiveCN111262022ALow profileHigh gainRadiating elements structural formsAntenna earthingsCircularly polarized antennaCommunications system
The invention provides a circularly polarized antenna. The antenna comprises an SMA connector, an upper dielectric substrate and a lower dielectric substrate, wherein the upper dielectric substrate and the lower dielectric substrate are arranged in a stacked manner; a parasitic patch is arranged on the lower surface of the upper dielectric substrate; a radiation patch and a Wilkinson power dividerfeed network are arranged on the upper surface of the lower dielectric substrate; a grounding plate is arranged on the lower surface of the lower dielectric substrate; the shunt port of the Wilkinsonpower divider feed network is connected with the radiation patch; the combination port of the Wilkinson power divider feed network is connected with the SMA connector so as to realize side feed, andtherefore, circularly polarized wave radiation is achieved; and the upper dielectric substrate partially projects and reflects radiation waves, so that waves on the outer side of the upper dielectricsubstrate are superposed in an in-phase manner. According to the circularly polarized antenna of the invention, the laminated structure with the additional parasitic patch is adopted, so that the radiation efficiency of the antenna is improved, and the antenna gain is improved; the antenna is simple in structure, achieves a circular polarization radiation mode, is low in profile, is easy to form an array, and can be widely used in communication systems such as satellites and radars.
Owner:DONGHUA UNIV
Low-power-consumption small satellite radar searching and tracking method for space target
PendingCN113805169ASatisfied no blind spot detectionReduce power consumptionRadio wave reradiation/reflectionPhased arrayLow power dissipation
The invention provides a low-power-consumption small satellite radar searching and tracking method for a space target. A C wave band is selected as a radar working frequency band. The phased array radar is used for firstly searching an airspace target, distance information of the target is obtained through distance compression, short-time Fourier transform and constant false alarm rate detection, and then angle measurement is carried out on the target by using sum and difference beams. And when the distance and angle information of the target is obtained, the target is tracked. Based on the design of the miniaturized phased array radar system, a signal processing method for target searching and tracking, and distance measurement and angle measurement error analysis, it is obtained that the miniaturized phased array radar can search a 40-degree * 40-degree three-dimensional space target within the range of 25 km, the distance measurement precision of 0.4 m and the angle measurement precision of 0.03 degree are achieved, and therefore, the large-range searching and tracking application requirements of the space target are met.
Owner:SPACE STAR TECH CO LTD
Method for accurately acquiring beam pointing of satellite radar antenna
ActiveCN108152787ASimple engineering application implementationReduce the impactRadio wave direction/deviation determination systemsDirection finders using electromagnetic wavesLaser transmitterOn board
The invention provides a method for accurately acquiring beam pointing of a satellite radar antenna, comprising the following contents: (1) a satellite is equipped with a microwave transmitting antenna, a laser emitter and a star sensor, wherein the transmitting antenna and the laser emitter have a common basis reference, and the transmitting antenna is located in front of a satellite radar antenna and directed to a radar antenna; (2) the transmitting antenna transmits microwaves to the radar antenna, the radar antenna receives and acquires the direction of the microwave beam in the transmitting antenna coordinate system, and the inversion obtains the radar antenna in the transmitting antenna coordinate system. The beam is pointed at the time of transmitting the microwave; (3) at the sametime (2) the laser emitter emits laser light into the star sensor, and the star sensor acquires the beam pointing and the position of the laser emitter in the star sensor coordinate system. The invention directly converts the microwave beam pointing information into the satellite star sensor coordinate system through the on-board optical reference and the microwave electrical reference conversion,and accurately acquires the beam in-orbit pointing information.
Owner:SHANGHAI SATELLITE ENG INST
InSAR rapid processing method-GHR-InSAR suitable for deformation geological disaster identification
PendingCN114415178AImprove computing efficiencyStrong fault toleranceRadio wave reradiation/reflectionTerrainInterferometric synthetic aperture radar
The invention discloses an InSAR (Interferometric Synthetic Aperture Radar) rapid processing method, namely GHR-InSAR, suitable for deformation geological disaster identification, and belongs to the crossing field of satellite radar measurement and geological disaster investigation. Firstly, all SAR data are selected to carry out Cn2 combination to calculate a space-time baseline; secondly, DInSAR calculation and phase unwrapping are carried out on SAR data pairs conforming to the space-time baseline criterion, and terrain horizon phases are removed; counting the relationship between the elevation and advection atmospheric phase, establishing an advection atmospheric error model, establishing a turbulence atmospheric model by using spatial filtering, and removing advection and turbulence atmospheric errors according to the two models; and finally, solving a time weighted average value of the multi-period deformation phase with the error removed, offsetting a random error phase, performing superposition enhancement on the deformation phase, and making up a blank area of a local non-interference result of an interferogram in a part of periods. The obtained interference result highlights high-frequency deformation ground disaster information, and the drawing is complete, smooth and small in error, thereby facilitating the later ground disaster recognition.
Owner:姚鑫
Ground disaster monitoring processing method and device of power transmission line, early warning system and equipment
PendingCN111880210AImproving the efficiency of disaster monitoring and processingElectrical/magnetic solid deformation measurementSatellite radio beaconingAnalytic modelData set
The invention relates to the technical field of power transmission lines, and provides a ground disaster monitoring processing method and device of a power transmission line, an early warning system and equipment. According to the invention, the ground disaster monitoring processing efficiency of the power transmission line can be improved. The method comprises the following steps: acquiring remote sensing satellite data of geological disasters of a region where a power transmission line is located to obtain a geologic disaster body deformation time sequence data set of the region, acquiring satellite radar data of the region to obtain spatial distribution information of monitoring points of the region, and performing measuring at observation points of the region to obtain Beidou measurement data; and inputting the geologic hazard body deformation time sequence data set, the spatial distribution information and the Beidou measurement data into a numerical analysis model to carry out simulation analysis on the deformation process of the geologic hazard body of the area where the power transmission line is located, thereby obtaining geologic hazard monitoring information of the areawhere the power transmission line is located.
Owner:CHINA SOUTHERN POWER GRID COMPANY
Multi-satellite formation radar timing synchronization method, device and equipment and storage medium
ActiveCN113472417ATime synchronizationSynchronisation arrangementRadio transmissionRadarSatellite system
The embodiment of the invention provides a multi-satellite formation radar timing synchronization method, device and equipment and a storage medium, which are applied to a multi-satellite formation spaceborne radar system. The spaceborne radar system comprises a primary satellite radar and at least one auxiliary satellite radar. The method comprises the following steps: acquiring relative time difference information between a second pulse signal output by a global navigation satellite system (GNSS) receiver of a primary satellite and a second pulse signal output by a GNSS receiver of any auxiliary satellite in at least one auxiliary satellite; according to the relative time difference information, performing time synchronization on the second pulse signal of the primary satellite and the second pulse signal of any auxiliary satellite; generating a timing signal of the main satellite radar and a timing signal of any auxiliary satellite radar based on the pulse per second signal after time synchronization. Based on the radar timing synchronization method provided by the invention, the time synchronization of the timing signals of the spaceborne radar system of the multi-satellite formation can be realized.
Owner:AEROSPACE INFORMATION RES INST CAS
Method for Accurately Obtaining Beam Pointing of Satellite Radar Antenna
ActiveCN108152787BSimple engineering application implementationImprove description accuracyRadio wave direction/deviation determination systemsDirection finders using electromagnetic wavesLaser transmitterLaser light
Owner:SHANGHAI SATELLITE ENG INST
High-power variable-dip-angle continuous section node array antenna
InactiveCN113161764AIncrease powerIncrease distanceParticular array feeding systemsAntennas earthing switches associationContinuous scanningRadar
The invention discloses a high-power variable-dip-angle continuous section node array antenna, and mainly solves the problem that the existing similar antennas do not have high-power performance. The antenna comprises a power divider (1), a lower-layer metal feed base plate (2) and an upper-layer metal disc (3), wherein the power divider is located under the circle center position of the lower-layer metal feed base plate and the circle center position of the upper-layer metal disc, and the output end of the power divider is connected with a plurality of bias parabolic reflection boxes (4) to form an antenna feed link; The lower-layer metal feed base plate is split into a plurality of sub-arrays along the propagation direction to feed respectively, the wide side of each sub-array has at least 10 wavelengths, and the narrow side of each sub-array has no more than 2 wavelengths; and a rotary joint (5) is arranged between the upper-layer metal disc and the lower-layer metal feed base plate so as to realize relative rotation of the upper-layer metal disc and the lower-layer metal feed base plate. On the basis of ensuring continuous scanning of the variable-dip-angle continuous section node array antenna, high-power performance is achieved, the operating distance is increased, and the antenna can be used for high-power and long-distance communication of satellites and radars.
Owner:XIDIAN UNIV
Airport FOD monitoring method, equipment, storage medium and device
ActiveCN112949474AImprove monitoring efficiencyEnsure safetyCharacter and pattern recognitionNeural architecturesRadarSimulation
The invention discloses an airport FOD monitoring method, equipment, a storage medium and a device. The method comprises: determining a first preprocessing result and a second preprocessing result for first airport runway image information acquired by an airport monitoring radar and second airport runway image information acquired by a satellite radar according to a preset neural network model; according to the first preprocessing result, the second preprocessing result and a preset obstacle model, determining position information of the to-be-identified obstacle and a danger level of the to-be-identified obstacle; and generating an FOD monitoring result according to the position information of the to-be-identified obstacle and the danger level of the to-be-identified obstacle. The image information is preprocessed according to the preset neural network model, and the position information and the danger level of the to-be-identified obstacle are determined according to the preset obstacle model, so that compared with manual patrol in the prior art, the invention is advantageous in that the FOD monitoring efficiency is improved, and the safety of airport personnel is ensured.
Owner:山东鹰格信息工程有限公司
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