Product
Feature
Quick Research
Generate reliable direction feasibility study reports for your R&D in just a few steps.
Technical Q&A
Discover and master advanced knowledge NOW. Basics, ideas, possibilities, all at once.
Find Solutions
As an expert in R&D theories, this can generate solutions to your technical problems instantly.
Evaluate Feasibility
Analyze your overall solution with one click, know your potential R&D risks in advance.
Monitor Landscape
Get weekly tech updates, stay abreast of the latest tech innovations and key insights.
Patents
Literature
Hiro is an intelligent assistant for R&D personnel, combined with Patent DNA, to facilitate innovative research.
213 results about "Radar observations" patented technology
Efficacy Topic
Property
Owner
Technical Advancement
Application Domain
Technology Topic
Technology Field Word
Patent Country/Region
Patent Type
Patent Status
Application Year
Inventor
Method and system for detecting an object using a composite evidence grid
ActiveUS7142150B2Anti-collision systemsElectromagnetic wave reradiationRadar observationsDual frequency
A method and system for detecting an object uses a composite evidence grid based on dual frequency sensing. A source transmits a laser transmission in a first zone. A detector receives a reflection of the laser transmission from an object in the first zone to determine laser observed data associated with points on the object. A transmitter transmits a radar transmission in a second zone that overlaps with the first zone. A receiver receives a reflection of the radar transmission from an object in the second zone to determine radar observed data associated with points on the object. The laser observed data is processed to form a laser occupancy grid for the first zone and the radar observed data is processed to form a radar occupancy grid for the second zone. An evaluator evaluates the radar occupancy grid and the laser occupancy grid to produce a composite evidence grid for at least an overlapping region defined by the first zone and the second zone.
Owner:DEERE & CO
Method and system for detecting an object using a composite evidence grid
ActiveUS20060125680A1Electromagnetic wave reradiationRadio wave reradiation/reflectionDual frequencyRadar observations
A method and system for detecting an object uses a composite evidence grid based on dual frequency sensing. A source transmits a laser transmission in a first zone. A detector receives a reflection of the laser transmission from an object in the first zone to determine laser observed data associated with points on the object. A transmitter transmits a radar transmission in a second zone that overlaps with the first zone. A receiver receives a reflection of the radar transmission from an object in the second zone to determine radar observed data associated with points on the object. The laser observed data is processed to form a laser occupancy grid for the first zone and the radar observed data is processed to form a radar occupancy grid for the second zone. An evaluator evaluates the radar occupancy grid and the laser occupancy grid to produce a composite evidence grid for at least an overlapping region defined by the first zone and the second zone.
Owner:DEERE & CO
Dual-polarization radar observation based method for improving thunderstorm weather warning and forecasting accuracy
ActiveCN107843884AA method for perfecting particle identificationGood removal effectICT adaptationRadio wave reradiation/reflectionHorizontal distributionWeather radar
The invention belongs to the field of radar observation based weather forecasting and discloses a dual-polarization radar observation based method for improving thunderstorm weather warning and forecasting accuracy. X waveband dual-polarization weather radar parameters are utilized. On the basis of quality control on data including phase defolding, filtering and attenuation correction and based ona fuzzy logic algorithm, environment temperature limits of sounding data are introduced for identification of multiple hydrometeors in a thunderstorm body. Comparatively detailed analysis is performed on evolution characteristics of the hydrometeors in clouds in two aspects including horizontal distribution and perpendicular distribution during a typical thunderstorm body development process according to an inversion result. Finally, a micro-physical concept model during the thunderstorm body evolution process is established and the structure and the evolution features of the thunderstorm body are acquired. The method provided by the invention facilitates recognition of hydrometeor distribution and a microphysical process in the typical thunderstorm body and provides a quantitative and direct technical support for thunderstorm weather warning and forecasting.
Owner:CHENGDU UNIV OF INFORMATION TECH
Imaging apparatus and method
InactiveUS7196653B2Low costFeasible effortRadio wave reradiation/reflectionRadar observationsImaging equipment
An imaging apparatus has transmitter illuminating a selected surface with a radar beam footprint, and processor for profiling / processing the radar returns so as to derive attitude information in real time about a number of predefined axes associated with the radar which depends upon the relative dispositions of the radar, the selected surface and upon the radar beam footprint characteristics.A plurality of transmit beams image the surface and the processing arrangement has the capability of determining roll, pitch and / or yaw pointing data associated with the radar, such pointing data being determined by derivation of the attitude information and by selective input of terrain elevation data so as to take account of variations in the radar viewing geometry with terrain elevation.This provides a low cost advantage over known radar designs, and retains utility for many applications, for example spaceborne and airborne applications.
Owner:ASTRIUM GMBH
Radar beyond visual range base line passive cooperative localization method
ActiveCN104076348AHigh precisionRadio wave reradiation/reflectionRadar observationsObservational error
The invention relates to a passive cooperative localization method for a radiation source target at sea according to observed values of double-station radars under the condition of the beyond visual range base line. Aiming at the problem that as under the influence from the earth curvature under the condition of the beyond visual range base line, the base line between the double-station radars is lengthened and angle measurement errors are introduced, the localization precision is poor, the passive cooperative localization method applicable to the beyond visual range base line is adopted to amend the radar measurement errors introduced by the earth curvature to achieve localization. The method comprises the specific steps that (1), coordinates of radar stations 1 and 2 are converted; (2), the detection range of a virtual target is generated initially; (3), the position offset of the virtual target relative to the station 1 is calculated; (4), the coordinates of the virtual target are calculated; (5), the observed value of the virtual target by the station 2 is calculated; (6), the measurement errors are judged; (7), the detection range of the virtual target is updated; (8), a localization result is output. By means of the method, the radar measurement errors introduced by the earth curvature can be amended, and the precision of the radar beyond visual range base line passive cooperative localization is improved effectively.
Owner:THE 724TH RES INST OF CHINA SHIPBUILDING IND
Ocean current field inversion satellite-borne SAR system based on angle diversity, and method thereof
ActiveCN105445730AComprehensive understanding of temporal and spatial changesNot subject to weather conditionsClimate change adaptationRadio wave reradiation/reflectionNatural satelliteShore
The invention discloses an ocean current field inversion satellite-borne SAR system based on angle diversity, and a method thereof. The satellite-borne SAR system comprises two radar antennas which are arranged in the flying direction of a satellite, wherein the two radar antennas respectively generate two radar wave beams; and the two wave beams have different squint angles and can irradiate the same area on the ocean surface in different time. The method comprises: utilizing the satellite-borne SAR system and taking a doppler center frequency as the observation variable to perform inversion on an ocean current field; and obtaining a complete velocity vector of an ocean current, that is, the ocean current information obtained through inversion not only includes the radial velocity information of the ocean current but also includes the azimuth velocity information. Compared with a traditional ocean surface current field inversion means, such as field observation and shore-base radar observation, the ocean current field satellite-borne SAR system based on angle diversity can realize inversion of a worldwide ocean current field, can comprehensively know about temporal and spatial variation of the ocean current, and can work all day long and all weather without limitation of meteorological conditions.
Owner:中科星图维天信科技股份有限公司
Linear frequency modulation radar signal processing method based on compressed sensing
ActiveCN107064883AEfficient acquisitionAchieve compressionWave based measurement systemsTime domainRadar observations
The invention discloses a linear frequency modulation radar signal processing method based on compressed sensing. The method comprises the steps of (1) emitting a linear frequency modulation signal to a radar and preprocessing an echo signal, which means that the deramping processing of the echo signal is carried out, a difference frequency signal is outputted, and a signal model of deramping processing is established in a time domain, (2) according to the sparsity of the difference frequency signal in a frequency domain, constructing a sparse conversion matrix, and establishing a sparse representation model of the radar echo signal, (3) constructing a measurement matrix, and realizing the projection transformation of a difference frequency sparse signal to a low dimensional space, and (4) using an orthogonal matching pursuit (OMP) algorithm, reconstructing a radar difference frequency signal, and efficiently obtaining target information. Accoding to the method, the compression of radar echo signal data can be fundamentally realized, the change of a sparse model according to a radar observation distance is not needed, finally the target information is obtained, and the method is suitable for the echo signal processing of an actual radar.
Owner:NANJING UNIV OF SCI & TECH
Method for tracking hypersonic velocity reentry vehicle based on Gaussian mixture approximate
InactiveCN107544067ASolve the degradation problemDescribe wellRadio wave reradiation/reflectionComputation processInertial coordinate system
The invention discloses a method for tracking a hypersonic velocity reentry vehicle based on Gaussian mixture approximate. The method herein includes the following steps: establishing a movement tracking model of a hypersonic velocity reentry vehicle in a North East Up inertial coordinate system, and separately establishing a radar observation model and a target priori model set of a target tracking system; and based on the priori model set and the radar observation model, in combination with radar echo data, acquiring a target state smooth estimation value and a covariance matrix smooth estimation value. According to the invention, the method introduces a Gaussian mixture approximate theory, designs a Gaussian mixture smooth filter under multiple models, uses Gaussian component adaptive consolidation strategy, and selects smooth window length in a scientific manner, so that the method herein can avoid large amount of computation and particle degeneracy that often exist in particle filtering. The method has the characteristics of simple computing and easy implementation, can accurately estimate sudden maneuvering, and increases rapid and precise tracking capability of the hypersonic velocity reentry vehicle.
Owner:NORTHWESTERN POLYTECHNICAL UNIV
Imaging apparatus and method
InactiveUS20050104763A1Low costFeasible effortRadio wave reradiation/reflectionRadar observationsContour analysis
An imaging apparatus 6 has means for illuminating a selected surface with a radar beam footprint, and means for profiling / processing the resultant radar returns in an efficient and logical fashion such as to derive radar attitude information in real time about a number of predefined axes associated with the radar which depends upon the relative dispositions of the radar and the selected surface and upon the radar beam footprint characteristics. Advantageously, a plurality of transmit beams 10,11,12 are used to image the surface and the processing arrangement has the capability of determining roll, pitch and / or yaw pointing data associated with the radar, such pointing data being determined by derivation of the attitude information and by selective input of terrain elevation data so as to take account of variations in the radar viewing geometry with terrain elevation. The inventive radar bears a definite low cost advantage over known radar designs, and retains utility for many applications, for example spaceborne and airborne applications.
Owner:ASTRIUM GMBH
High-precision tracking method applied to non-engine maneuvering target
ActiveCN103308896AGuaranteed real-time accuracyRealize high-precision trackingWave based measurement systemsRadar observationsSelf adaptive
The invention relates to a high-precision tracking method applied to a non-engine maneuvering target. According to the method, firstly, a target motion model containing system adaptive parameters is built according to the non-zero mean time relevant random process characteristic met by the accelerated speed in the actual target motion; secondly, the target motion characteristic is predicated according to the built target motion model; then, the current state estimation value of the target is calculated through utilizing the target state predicating value and the radar observation data value; and finally, the system adaptive parameters are corrected according to the accelerated speed estimation value of the target, the corrected system adaptive parameters are utilized for updating the target motion model, and the updated target motion model is utilized for carrying out next predication and estimation. The method has the advantages that the target with the non-engine maneuvering random character realizes the online estimation, the accuracy of a maneuvering target model for describing the actual motion characteristics is improved, and the tracking precision of the non-engine maneuvering target is improved.
Owner:BEIJING TECHNOLOGY AND BUSINESS UNIVERSITY
Non-convex optimization based MIMO radar moving object detection method
InactiveCN103744076AAccurate moving target detection resultsHigh resolutionRadio wave reradiation/reflectionRadar observationsImage resolution
The invention discloses a non-convex optimization based MIMO radar moving object detection method. The method comprises the following steps: according to radar parameters, performing distance-angle-Doppler grid dividing on an observation area; according to radar emission, the position of a receiving array, and radar observation area parameters, calculating emission and reception guiding vectors; according to emission signal waveforms, the guiding vectors and a distance unit time delay transformation matrix, constructing a sparse dictionary matrix; performing serialization on echo signals received by an antenna array; and according to an aforementioned model, constructing MIMO radar moving object detection to be an optimization problem of an L[1 / 2] norm minimizing constraint; and using a heavy weight determining L[1] norm regularization method to solve the optimization problem, obtaining distance-angle-Doppler imaging of a MIMO radar moving object, and detecting a moving object in the observation area. By using the method provided by the invention, a moving object detection result more accurate than a result by use of a convex optimization algorithm can be obtained, and the detection result is higher in resolution.
Owner:HOHAI UNIV
Metallic ball calibration method for X-band solid dual-polarization weather radar
Owner:INST OF ATMOSPHERIC PHYSICS CHINESE ACADEMY SCI +1
Multichannel synthetic aperture radar imaging method
InactiveCN103630897AImprove operational efficiencyReduce computing costRadio wave reradiation/reflectionRadar observationsSynthetic aperture radar
The invention provides a multichannel synthetic aperture radar SAR imaging method comprising the following steps: forming a multichannel radar observation equation Yi based on an echo simulation operator Mi (X) according to one-emission-multi-reception SAR echo data; forming a multichannel SAR imaging model based on sparse regularization according to the multichannel radar observation equation Yi; employing a threshold iteration algorithm to solve the multichannel SAR imaging model, and reconstructing observation scene backscattering coefficient X*, thereby obtaining a complex image of the observation scene. The multichannel synthetic aperture radar SAR imaging method can improve operation efficiency and reduce calculation cost.
Owner:INST OF ELECTRONICS CHINESE ACAD OF SCI
Warning radar multi-target multi-channel parallel tracking processing method
The invention discloses a warning radar multi-target multi-channel parallel tracking processing method. The method comprises the steps that firstly, a parallel flight path tracking framework is built,and the tracking framework is divided into a plurality of non-interfering independent tracking channels; secondly, the target motion statistics and feature recognition means in the tracking channelsare used for automatically starting the flight path; then, according to motion feature setting relevance, filtering models and parameters of the different tracking channels, the official flight path is tracked, and a target likelihood function is used for performing flight path tracking quality evaluation; finally, on the basis of the parallel fusion framework and a flight path management strategy, the multi-channel tracking results are unified, and the comprehensive and accurate warning area target posture is obtained. The sea surface and aerial targets observed by a warning radar are dividedinto the multiple channels for finding and maintaining the flight path, and therefore the effects of comprehensively and accurately finding the targets, and tracking different types of targets in a high-precision and high-stability mode are achieved.
Owner:THE 28TH RES INST OF CHINA ELECTRONICS TECH GROUP CORP
Data fusion method and system of millimeter-wave cloud radar
ActiveCN104345312AImprove the degree of automatic observationAchieve integrationICT adaptationRadio wave reradiation/reflectionRadar observationsData quality
The invention relates to a data fusion method and system of a millimeter-wave cloud radar. The data fusion method comprises the following steps of building an observation platform of the millimeter-wave cloud radar, wherein the observation platform comprises a control module, a signal processing module, an information acquisition module, a main control module and a data fusion module; controlling the radar to carry out meteorological target detection according to a multi-mode working mode by the control module, obtaining detection data and transmitting the detection data to the signal processing module; carrying out signal processing on the detection data by the signal processing module and outputting; acquiring the signal-processed detection data output by the signal processing module by the information acquisition module, and carrying out package processing on the acquired detection data and storing the processed detection data into the main control module; and carrying out data fusion on the detection data stored in the main control module by the data fusion module and obtaining a fusion result. The data fusion method has the advantages that the observation to meteorological targets in the full-height detection range is realized, the data quality and the detection efficiency are improved and the adaptability of the cloud radar to different meteorological targets is enhanced.
Owner:航天新气象科技有限公司
Dual linear polarization radar system and measurement method for strong rain
PendingCN107064937AGood effectWide applicabilityWeather condition predictionRadio wave reradiation/reflectionFine structureRadar systems
The invention discloses a dual linear polarization radar system. The dual linear polarization radar system comprise a data base module, a strong storm preprocessing module, a data matching and identification module, a strong storm processing module, a data correction module and a strong storm early-warning module. Time and space synchronization of a large-scale or specific-region weather system and collaborative observation of a fine structure are achieved by utilizing an efficient communication network application satellite navigation system adaptive to a weather radar network through an application of radar networking. High-definition GIS information and the collaborative observation are combined, quantitative time and space consistency of networking radar observation is achieved, and abilities to monitor and early warn disastrous weather such as strong rain are improved. The invention further provides a corresponding measurement method for the strong rain on a plateau by utilizing a dual linear polarization radar system network.
Owner:泰州飞帆船舶科技有限公司
Satellite-borne radar rainfall correction method based on active and passive microwave joint detection
PendingCN112213727AGuaranteed accuracyWeather condition predictionRadio wave reradiation/reflectionRadar observationsRadar systems
The invention discloses a satellite-borne radar rainfall correction method based on active and passive microwave joint detection, and the method comprises the steps: correcting the deviation between active radar observation data and passive radiometer observation data in the presence of rainfall through employing numerical prediction background field historical data and observation historical data; performing space-time matching on the corrected active radar observation data, the corrected passive radiometer observation data and the numerical forecasting background field atmosphere three-dimensional space distribution information; using the numerical forecasting background field atmosphere three-dimensional space distribution information as prior information, and using the corrected activeradar observation data and the corrected passive radiometer observation data for calculation to obtain an optimal analysis atmosphere cloud and rain profile; and calculating a related rainfall correction coefficient of the active radar according to the optimal analysis atmospheric cloud and rain profile. The method is suitable for various satellite-borne radar systems and passive microwave instruments, and the precision of the rainfall correction coefficient can be guaranteed.
Owner:NAT SATELLITE METEOROLOGICAL CENT
Target combined positioning method based on Euler's distance means clustering
InactiveCN104898104AWell formedSatisfied with the resultWave based measurement systemsRadar observationsCluster algorithm
The invention provides a target combined positioning method based on Euler's distance means clustering, wherein the method comprises the steps of obtaining the position parameter of a target in a transmission coordinate system from observation data of each radar, obtaining the estimated amount of a target position parameter according to a simple track fusion method, calculating the Euler's distance between the positioning result of a single radar and a means clustering center, optimally determining the similarity among target position parameters by means of a fuzzy means clustering algorithm, fusing target position parameters according to a corresponding membership grade, and obtaining a target position parameter after fusion. The target combined positioning method has a simple computing model form and furthermore can effectively determine the spatial position of a flying target.
Owner:CHINA XIAN SATELLITE CONTROL CENT
Aerosol foundation data-based AOD vertical correction effect evaluation method and system
InactiveCN106446307ASolution effect evaluationSolve the problem of selectivityParticle suspension analysisSpecial data processing applicationsCorrection methodScale effects
The invention provides an aerosol foundation data-based AOD (Aerosol Optical Depth) vertical correction effect evaluation method and system. The method comprises the steps of estimating a near-surface aerosol extinction coefficient and inverting the near-surface aerosol extinction coefficient based on observation data of a foundation visibility meter; inverting AOD based on observation data of a foundation sum photometer; inverting the near-surface aerosol extinction coefficient based on the visibility meter; performing vertical correction on the AOD based on a laser radar observation method or an atmospheric chemistry mode simulation method, and estimating the near-surface aerosol extinction coefficient according to a vertical correction result; and evaluating the effect and applicability of an AOD vertical correction method by comparing the difference between the estimated near-surface aerosol extinction coefficient with the inverted near-surface aerosol extinction coefficient. According to the method and the system, the errors caused by direct use of a satellite for AOD inversion and the evaluation uncertainty caused by a scale effect and the like can be avoided, so that the difficult problems in effect evaluation and applicability selection among various AOD vertical correction methods and various data sources are solved.
Owner:INST OF REMOTE SENSING & DIGITAL EARTH CHINESE ACADEMY OF SCI
Road disastrous weather monitoring method and vehicle early-warning method
ActiveCN106918849AImprove time resolutionIncrease coverageRainfall/precipitation gaugesRoad vehicles traffic controlPersonalizationWeather radar
The invention relates to a road disastrous weather monitoring method. Based on design of an existing traffic weather station, Doppler meteorological radar observation data are introduced. By means of characteristics such as large range and high time resolution in the Doppler meteorological radar observation data, defects in existing road weather monitoring are settled, and coverage monitoring for no-monitoring areas without the traffic weather station is realized, thereby effective coverage rate and accuracy in road weather monitoring. The invention further relates to a vehicle early-warning method based on road disastrous weather monitoring. Furthermore a road disaster range is transmitted to drives on the road. In-advance early-warning in short time can be realized. Individualized vehicle condition information is combined with a disastrous weather risk, thereby realizing more accurate service to a vehicle user group, realizing efficient, in-time and accurate transmission of road emergent disastrous weather information to the vehicle drivers, and ensuring high driving safety on the road.
Owner:江苏省气象服务中心
A lightning forecasting method and system
ActiveCN108957595ANowcasting RealizedImprove abilitiesWeather condition predictionRadar observationsObservation data
The application relates to a lightning forecasting method and system. The method comprises the steps of reading the latest electric field station observation data and radar observation data of an electric field station, and establishing a lightning proximity prediction model according to the electric field station observation data and the radar observation data; the establishing of the lightning proximity prediction model comprises the following steps: step a: setting an electric field amplitude threshold and an electric field difference threshold; step b: judging whether the read electric field station observation data reaches the set electric field amplitude threshold or the electric field difference threshold, and if the electric field station observation data reaches the set electric field amplitude threshold or the electric field difference threshold, performing step c; step c: determining whether the radar observation data before the current time reaches the preset threshold, ifthe radar observation data reaches the preset threshold, performing step d; and step d: generating a lightning warning graphic product and issuing lightning warning. The application realizes the beforehand release of thunderstorm early warning, and raises the capability and level of lightning forecast.
Owner:深圳市雅码科技有限公司
Tracking initiation method including radial velocity information for a circular motion target
InactiveCN105044710AExtended Portal TypeHigh feasibilityRadio wave reradiation/reflectionRadar observationsRadar systems
The invention discloses a tracking initiation method including radial velocity information for a circular motion target. The method comprises the following steps: first, based on motion features, establishing a continuous motion equation of the target, and converting the continuous motion equation of the target to a discrete motion equation; secondly, establishing a radar observing model which includes the radial velocity information in a polar coordinate system; thirdly, based on the features of a multiple frequency cw radar as described that the multiple frequency cw radar can not only obtain distance and angle information, but can also obtain velocity information, designing a tracking initiation gate which includes the radial velocity information; finally, configuring a tracing initiation flow chart which includes the radial velocity information. The method herein is applicable to radar systems which can provide velocity information, such as a multi-frequency cw radar system, a pulse Doppler radar system, etc. The method is also applicable to tracking initiation of a horizontal circular motion target, and can increase the effects of tracking initiation. In addition, the method herein is not only applicable to tracking initiation of horizontal circular motion, but is also applicable to other target motion patterns, and has excellent expansibility and value in popularization and application.
Owner:袁俊泉 +2
Method for initiating radar target track based on random forest
ActiveCN107688170AAdaptableRough resolution rulesCharacter and pattern recognitionRadio wave reradiation/reflectionRadar observationsPoor adaptive skills
The invention discloses a method for initiating a radar target track based on random forest, and relates to a method for initiating a radar target track. The method aims at solving the problems of rough rule, poor accuracy, artificial setting of threshold value, and poor suitability to strong clutter environment in the existing visual method and logic method; larger calculation amount, multiple batches of data measuring, longer initiating time, and low target initiating probability on non-linear movement in a correction Hough conversion method and the like. The method specifically comprises the following steps of 1, extracting features from a point trace combination of historical observation data of radar to form a sample set D; sampling D, and forming n training sample collection sets; 2,training a t-th decision tree by the t-th training sample collection set, and forming a random forest combination classifier; 3, in the testing phase, performing data pre-selecting and feature extraction on the point traces of a radar observation area so as to obtain the track initiating result via the classifier. The method is suitable for the field of initiating of radar target tracks.
Owner:HARBIN INST OF TECH
Fractal dimension threshold iteration sparse microwave imaging method based on sparseness estimation
ActiveCN104251991AQuality improvementHigh precisionRadio wave reradiation/reflectionRadar observationsRadar systems
The invention provides a fractal dimension threshold iteration sparse microwave imaging method based on sparseness estimation. The method comprises the following specific steps: step 1, a radar observation model is established by using radar system parameters tested actually, and the sparseness estimation value of a target scene is calculated through the radar observation model; step 2, according to the sparseness estimation value, thresholds corresponding to striped areas of different orthogonal dimension coordinates are set self-adaptively, and the coordinate position of a strong point target is evaluated by using a fractal dimension threshold iteration method; step 3, based on the coordinate position of the strong point target, the back scattering coefficients of the target scene is recovered by using a least squares supported projection method to achieve microwave imaging. The method can obtain radar echo data under the downsampling condition, and high-quality and high-precision microwave images are reconstructed.
Owner:INST OF ELECTRONICS CHINESE ACAD OF SCI
Method for detecting floating targets on sea based on normalized Doppler spectrum
InactiveCN104076350AAdaptableLive UpdateRadio wave reradiation/reflectionRadar observationsDetection threshold
The invention discloses a method for detecting floating targets on the sea based on a normalized Doppler spectrum, and relates to the field of radar target detection. The method includes the steps that firstly, radar echo data are divided into blocks, and divided echo data are acquired; secondly, the normalized Doppler spectrum is calculated for the echo data of a unit to be detected; thirdly, the detection statistical amount is constructed according to the normalized Doppler spectrum; fourthly, a false alarm probability is given, and a detection threshold is acquired through a Monte Carlo experiment; fifthly, whether the targets exist or not is judged according to the detection statistical amount and the detection threshold, if the detection statistical amount is larger than the detection threshold, it is judged that the targets exist, or else it is judged that the targets do not exist. The method mainly solves the problems that in the prior art, detection performance is low when radar observation time is short. The method is adaptive, suitable for different sea states and space-time changes, and capable of effectively detecting the floating targets under the seat clutter background.
Owner:XIDIAN UNIV
Target tracking-before-detecting method based on Gaussian cardinalized probability hypothesis density filter
ActiveCN106526585AReduce complexityImprove tracking accuracyRadio wave reradiation/reflectionRadar observationsCovariance
The invention provides a target tracking-before-detecting method based on Gaussian cardinalized probability hypothesis density filter, comprising the following steps: initializing: letting k represent a k time wherein k starts from one and belongs to a set of 1, 2,...,D; determining Nk targets corresponding to the k time; recording the moving state of the pth target at the k time as what is described in the figure; calculating the likelihood function corresponding to the intensity of the moving state Xk of the Nk targets at the (i,j) position contained in a radar observation area in the k-time Cartesian coordinate system under the moving state of the pth target at the k time; then calculating the average state estimations of the Nk targets at k time and the covariance estimations of the Nk targets at k time; and calculating in sequence the probability pk(Nk) of the target number (Nk) at the k time and the estimated value of the targets Nk contained in the radar observation area Nx X Ny in the k-time Cartesian coordinate system; letting one added to k to obtain the estimated value of target N1 included in the radar observation area Nx X Ny in the Cartesian coordinate system at 1 time to the estimated value of the target number ND included in the radar observation area Nx X Ny in the Cartesian coordinate system at D time.
Owner:AIR FORCE UNIV PLA
Error joint estimation method for GM-EPHD filtering radar system based on ADS-B data
InactiveCN104849702AHigh positioning accuracyImprove estimation performanceWave based measurement systemsRadar observationsKaiman filter
The invention provides an error joint estimation method for a GM-EPHD filtering radar system based on ADS-B data. Firstly, the ADS-B observed values of a target is converted in a rectangular coordinate system with the position of a radar station as a center thereof to establish an ADS-B and radar observation equation of the target. A state transition equation of the target and the radar system error is established in the linear gaussian condition, and the radar system error is expanded to a target state to form an extended state. The gaussian hybrid-probability assumed density filtering on the target state is conducted by utilizing the ADS-B observed values after the coordinate transformation process, so that an accurate estimation on the target state is obtained. After that, the gaussian hybrid-probability assumed density filtering on the target state is conducted on the extended state after the updating of the target state by utilizing radar observation data. Furthermore, the joint estimation of the target state and the radar system error is conducted by a two-step kalman filter. Finally, the fusion estimation result of the radar system error is obtained through the weighted average algorithm. The method is high in estimation accuracy and good in estimation performance.
Owner:CIVIL AVIATION UNIV OF CHINA
Observation method of millimeter wave weather radar
ActiveCN103592648AFlexible settingsStrong control functionRadio wave reradiation/reflectionICT adaptationWeather radarEngineering
The invention discloses an observation method of a millimeter wave weather radar. The observation method of the millimeter wave weather radar comprises the specific steps that (1) a millimeter wave weather radar observation platform is set up, wherein the millimeter wave weather radar observation platform comprises an industrial control computer (1), an observation strategy setting module (2), an observation strategy scheduling module (3), an information acquisition module (4), an antenna controller (5) and a signal processor (6); (2) observation strategy parameters are set by the observation strategy setting module (2); (3) the observation strategy scheduling module (3) has control over the execution sequence of observation strategies, and carries out scheduling on the execution sequence of the observation strategies; (4) the information acquisition module (4) acquires antenna position information and echo processing signals of the millimeter wave weather radar. Therefore, observation of the millimeter wave weather radar is achieved. According to the observation method of the millimeter wave weather radar, setting of observation parameters is comprehensive and flexible, the control function is good, information of a weather object of an omnibearing three-dimensional space can be automatically obtained, weather data are complete, observation efficiency is high, and it is ensured that the requirement for research and application of the weather objects such as cloud is met.
Owner:航天新气象科技有限公司
Slam method and Slam device based on prior information
ActiveCN107607107AHigh precisionConstrained global consistencyNavigation instrumentsSpecial data processing applicationsRadar observationsPattern recognition
The invention provides a Slam method based on prior information. The method includes the steps of: 1) adding an initial pose node, extracting primary feature of initial radar observation, marking keyfeatures, adding a feature node to a map, and calculating the constraint and weight of the feature node and the initial pose node; 2) extending the map by means of observation, the prior information and the key features; 3) when the last frame of radar observation information is added to the map, performing global optimization to obtain a route and a feature map; 4) establishing a raster map of the environment on the basis of a Bayesian filter according to the route, which is obtained through the final optimization, of a movable robot and observation corresponding to every pose. The prior information is introduced through the expandable feature hierarchy, so that the method can adapt different environments and prior information in different types; besides the structural features, the key features are also considered, and the framework and size of the environment are further constrained by means of the extra constraint among the key features, thus reducing accumulated error.
Owner:STANDARD ROBOTS CO LTD
Method for eliminating false target under radar networking
ActiveCN104656070AReduce incidenceImprove target recognition and positioning accuracyWave based measurement systemsInformation processingRadar observations
The invention discloses a method for eliminating a false target under radar networking, and belongs to the technical field of radar target information processing, which is used for solving the problems that when existing multiple networking radars are used for observing the same region, a false target is generated because the precisions of the radars are different and the target position data acquired by the multiple radars are different, and further the correct judgment of the current battlefield situation is affected. According to the key point of the technical scheme, the method comprises the following steps: constructing a universal radar communication protocol mold plate, and acquiring the radar target data by utilizing the communication protocol mold plate; associating target data information; measuring the target data similarity; and integrating the target data after the target data similarity is measured. According to the invention, the false target generation probability is reduced by around 50%, and the false target generation probability under the radar networking condition is reduced. The method is mainly applied to the military radar target information processing process, and also can be extensively applied to the multi-sensor information integration process in the measurement process.
Owner:HARBIN INST OF TECH
Who we serve
- R&D Engineer
- R&D Manager
- IP Professional
Why Patsnap Eureka
- Industry Leading Data Capabilities
- Powerful AI technology
- Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.
© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com