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364results about How to "Improve observation accuracy" patented technology
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Reference image display method for ultrasonography and ultrasonograph
ActiveUS20070010743A1Increased freedom of settingImprove comparison accuracyUltrasonic/sonic/infrasonic diagnosticsImage enhancementReference imageTomographic image
An ultrasonic image 105, 106 is captured by an ultrasonic probe 104. A reference image 111 is obtained by extracting a tomographic image corresponding to the scan plane of the ultrasonic image from volume image data that is pre-obtained by a diagnostic imaging apparatus 102 and that is stored in a volume-data storing unit 107. The ultrasonic image and the reference image 111 are displayed on the same screen 114. In this case, of the reference image, a portion corresponding to the view area of the ultrasonic image is extracted and the resulting reference image having the same region as the ultrasonic image is displayed as a fan-shaped image.
Owner:FUJIFILM HEALTHCARE CORP
Method for disturbance compensation based on sliding mode disturbance observer for spacecraft with large flexible appendage
ActiveUS9694918B1Improve observation accuracyStrong robustnessCosmonautic vehiclesDigital data processing detailsCompound aControl system
The present invention provides a method for disturbance compensation based on a sliding mode disturbance observer for a spacecraft with a large flexible appendage, comprising steps of: a) building a spacecraft attitude control system; b) constructing an external system, the external system being incorporated with an uncertain portion of a damping matrix of a flexible appendage of the spacecraft; the external system being incorporated with an uncertain portion of a rigidity matrix of the flexible appendage of the spacecraft and describing a sum of flexible vibration and environmental disturbance; c) configuring a sliding mode disturbance observer for estimating the value of the sum of flexible vibration and environmental disturbance; d) compounding a nominal controller with the sliding mode disturbance observer in step c) to obtain a compound controller; the compound controller compensating for the sum of flexible vibration and environmental disturbance.
Owner:BEIHANG UNIV
Omnibearing vision sensor with no dead angle
InactiveCN101004538AResolve interferenceSolve the dead angle problemTelevision system detailsColor television detailsTransducerVision sensor
An omnibearing visual transducer of blind angle free type is prepared for setting catadioptric lens at top of transparent external cover, arranging an opening at bottom center of said external cover, setting said transparent external cover on support frame, arranging video camera head on focus point of catadioptric lens and setting said catadioptric lens and transparent external cover as well as video camera head to be on the same axle coaxially.
Owner:汤一平
Multiple points settlement observation method and device therefor
InactiveCN101016733AMonitoring layer settlementLow costBarrages/weirsRoadwaysMultiple pointObservation method
The invention discloses a method for checking artificial embankment body and foundation sink. The method comprises that embedding a deep sink detector and a shallow sink detector with hollow tubular structures in each checking layer along one normal line at object position in the artificial embankment body, and leading measuring device or measuring medium into a measuring channel formed by the shallow sink detector and a connecting tube, to measure the position change of the shallow sink detector and measure the height strike of the upper end of the connecting tube to find out the sink of each checking layer.
Owner:NORTHWEST RES INST CO LTD OF C R E C
Fusion method and device of multisource sea surface wind field
ActiveCN105975763AImprove observation accuracySpecial data processing applicationsInformaticsNumerical weather predictionSystems research
The invention provides a fusion method and device of a multisource sea surface wind field. The fusion method comprises the following steps: obtaining multisource sea surface wind field data which comprises sea surface wind field data and / or multiple pieces of reanalysis meteorological sea surface wind field data collected by a plurality of satellite borne microwave remote sensors; according to a preset temporal-spatial resolution, independently carrying out meshing processing on the sea surface wind field data obtained by each satellite borne microwave remote sensor to obtain multiple pieces of corresponding sea surface wind field data with the equal longitude and latitude; and utilizing a temporal-spatial interpolation algorithm to carry out interpolation calculation on all sea surface wind field data with the equal longitude and latitude to obtain fusion sea surface wind field data. The fusion method can perform the advantage of the cooperative observation of a multisource satellite, can effectively improve the coverage range and the temporal-spatial resolution of the sea surface wind field data through the fusion sea surface wind field data constructed by the fusion of satellite remote sensing wind field data and / or reanalysis meteorological sea surface wind field data on a premise that meso-and micro-scale characteristic information can be kept, and can better meet the requirements of numerical weather prediction, marine forecasting research and marine meso-and micro-scale system research.
Owner:NAT SATELLITE OCEAN APPL SERVICE +1
Method for observing rotary speed of induction motor of Kalman filter with index fading factor
InactiveCN102176653AReduce mistakesReduce distractionsElectronic commutation motor controlVector control systemsKaiman filterState variable
The invention provides a method for observing a rotary speed of am induction motor of a Kalman filter with index fading factor, belonging to the field of drive control of motors. The method solves the problem that the observing result of state variable is influenced because the matrix error of the noise covariance is great in the standard Kalman filter EKF (Extended Kalman Filter) algorithm which is used for observing the rotary speed of the induction motor in the prior art. In the invention, the method realizes the rotary speed observation on the basis of a rotary speed observer and the Kalman filter is utilized in the rotary speed observer to carrying out error predication; the index fading factor lambda (K+1) is introduced into an error covariance matrix predictive equation of the Kalman filter in the process of realizing the rotary speed observation by operating the rotary speed observer; and the error covariance matrix predictive equation is shown in the specification. The method provided by the invention is suitable for observing the rotary speed of the induction motor.
Owner:HARBIN INST OF TECH
Flight path fusion method
InactiveCN102322861AReduce the impact of fusionReliable trackingNavigational calculation instrumentsDistance matrixEngineering
The invention belongs to the technical field of multisource information fusion, and discloses a flight path fusion method. The flight path fusion method comprises the following steps of: establishing a relative distance matrix between data by using observation information of a plurality of sensors; computing a support threshold function to obtain a support threshold matrix, establishing an equation set, and solving a weighting factor; multiplying the weighting factor with a corresponding observed value, obtaining corresponding filter values respectively through filtering, and adding all obtained filter values to obtain a filter fusion value with an observation coefficient; and updating an estimated value of target state step by step by using Kalman filtering, wherein the filter fusion value serves as a state updating input value. In the invention, as the filter fusion of the observation coefficient is carried out through the observation information of the plurality of sensors, influence on the fusion of flight paths due to the uncertainty of the observation information is reduced under the condition that data processing complexity is not increased; and correlation of the observation information is taken into consideration during the filter fusion of the observation coefficient, so that observation accuracy is increased, and the reliable tracking of a target is obtained.
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA
Beidou plus GPS dual-pattern single point positioning method
InactiveCN108594275AIncrease the number ofLots of redundant informationSatellite radio beaconingObservation dataEphemeris
The invention discloses a Beidou plus GPS dual-pattern single point positioning method. The method is characterized by comprising the following steps of 1, obtaining observation data and navigation data of each epoch; 2, extracting pseudo-range measurement values, time information and ephemeris parameters; 3, determining the position (Xs, Ys, Zs) of each satellite in a WGS-84 earth centered earthfixed coordinate system; 4, obtaining the distance between each satellite and the earth; 5, obtaining measurement error variances sigma2 of the pseudo-range measurement values and conducting weightingon the pseudo-range measurement values; 6, obtaining a pseudo-range residual error y and a coefficient matrix H of an observation equation y=H delta x+v; 7, obtaining the position of a receiving machine and satellite elevation angles which are figured out by means of k-th iteration; 8, judging whether or not an iteration end condition is satisfied and deciding whether or not the iteration processcan be continued. The method has the advantages of being high in operability, convenient to use and accurate in positioning; by means of the method, the horizontal precision for positioning can reach2 meters, and the vertical precision for positioning can reach 3 meters.
Owner:GUILIN UNIV OF ELECTRONIC TECH
Large flexible spacecraft interference compensation method based on sliding mode disturbance observer
ActiveCN106406086AImprove observation accuracyImprove robustnessCosmonautic vehiclesCosmonautic partsSpacecraft attitude controlFlexible spacecraft
Owner:BEIHANG UNIV
Image sensor
InactiveUS20070045517A1Good colorFound out highly accuratelyTelevision system detailsRadiation pyrometryLength waveLight filter
In an embodiment example of the present invention, an image sensor comprises a filter used for an extraction of a specific color component of an incident light, a light receiving element which observes the incident light via the filter, a compensating filter having a transmission restraining characteristic in a visible light wavelength range and a transmission characteristic in a wavelength range on a longer wavelength out of the visible light wavelength range, and a compensating light receiving element which observes the incident light via the compensating filter for compensating an observation result by the light receiving element.
Owner:TOPPAN PRINTING CO LTD
Cloud chamber for atmospheric ice nucleus activation counting and cloud chamber system
InactiveCN102645680AImprove observation accuracyHigh precisionIndividual particle analysisTemperature controlInlet valve
Owner:NANJING UNIV OF INFORMATION SCI & TECH
Torque closed-loop control method of interior permanent magnet synchronous motor driving system for automobile
ActiveCN108551287AHigh control precisionImprove operational efficiencyElectronic commutation motor controlVector control systemsLoop controlClosed loop
The invention provides a torque closed-loop control method of an interior permanent magnet synchronous motor driving system for an automobile. The torque closed-loop control method combines a maximumtorque to current ratio algorithm with dual current loop flux-weakening control, utilizes an invented torque observer, corrects a set value of a quadrature axis current in real time by means of a torque closed loop PI adjuster, ensures that the motor output torque can track a torque instruction quickly and precisely in the case of errors in motor parameters, and further realizes high-precision torque closed-loop control of the driving system. The torque closed-loop control method has the advantages of clear principle and simple calculation, can be widely applied to interior permanent magnet synchronous motor driving systems for automobiles, can be popularized to the servo control of permanent magnet synchronous motor in other fields, and has high theoretical significance and engineering application value.
Owner:NAVAL UNIV OF ENG PLA
Omnibearing vision device
InactiveCN1878297AAvoid light saturationImprove observation accuracyColor signal processing circuitsClosed circuit television systemsOmnidirectional antennaComputer graphics (images)
The invention relates to an omnidirectional video device, which comprise an omnidirectional camera, a microprocessor, a memory, and a display. Wherein, the omnidirectional camera is formed by reflective element, lens, and camera element; the reflective element comprises hyperbola mirror; the CCD camera element is at the virtual focus of hyperbola mirror; the lens is between the CCD camera element and the hyperbola mirror; the camera element, via video input interface, is connected to the microprocessor; the display is connected to the video output interface of microprocessor; the microprocessor comprises an image collecting module, an image storage module, an image pretreatment module for removing noise and smoothening the collected image, an image initialization module, an image expanding processing module for using geometry conversation to unfold the round omnidirectional image obtained by CCD camera element into rectangle cylinder omnidirectional image, and an image output module. The invention can obtain real-time omnidirectional image in high accuracy, without torsion.
Owner:ZHEJIANG UNIV OF TECH
Observing device and fluorescent light observing device
An image can be captured with a high resolution to improve an observing accuracy without excessively reducing a numeric aperture despite a smaller magnification. A microscope observing device comprising a light source for applying an exciting light or a lighting light to a specimen placed on a stage, an object lens disposed oppositely on the stage to magnify a fluorescent light or a reflection light from the specimen, an imaging lens for forming an image on the specimen magnified by the object lens, and an imaging means for picking up the image on the specimen formed by the imaging lens, wherein a mechanism for switching object lenses is provided along with a plurality of object lenses with different magnifications, and a mechanism for switching imaging lenses (5a, 5b) is provided along with a plurality of imaging lenses with different magnifications.
Owner:OLYMPUS CORP
Three-dimensional observation device for scouring terrain
InactiveCN101975570AAccurate collectionImprove observation efficiencySurveying instrumentsPicture taking arrangementsTerrainImage calibration
The invention relates to a three-dimensional observation device for scouring terrain, belonging to the field of terrain measurement and comprising a full-plane laser projector, an image collection device, a terrain image calibration device, a host lifting device, a fixed support structure and a power supply system, wherein the full-plane laser projector comprises a slot-shaped line type laser die set, a die set micro-adjusting bracket, a baffle board, a cover board, a laser distance meter and a universal joint; the terrain image calibration device comprises a spot type laser die set and a fixed supporting board; the image collection device comprises a computer, a digital camera, a camera gravity positioning box and a universal joint; the respective horizontal angle of the full-plane laser projector and the digital camera is automatically adjusted through the universal joint under the self-weight action so that the full-plane laser is in parallel to a horizontal plane; the principal optical axis of the camera is perpendicular to the horizontal plane; and the host lifting device controls the lifting of the full-plane laser projector in a step pitch setting mode. The integral set of the system has higher observation efficiency and precision, and is suitable for the research on the aspect of terrain three-dimensional analysis in a river model test.
Owner:DALIAN UNIV OF TECH
Optimized permanent magnet synchronous motor sensorless control method
InactiveCN110572091AImprove filtering performanceImprove observation accuracyVector control systemsDynamo-electric converter controlPermanent magnet synchronous motorElectromotive force
The invention discloses an optimized permanent magnet synchronous motor sensorless control method, which comprises the following steps: Clark coordinate transformation is performed on a three-phase current and a three-phase voltage acquired by a sensor to obtain a voltage and a current under a two-phase static coordinate system, and the voltage under the two-phase static coordinate system is inputto a sliding mode current observer to obtain an observed current; the difference between the observed current and an actual current is input to a back electromotive force observer based on a saturation function to obtain an estimated initial value of back electromotive force, and the sliding mode gain ksmo in the back electromotive force observer based on a saturation function is adjusted by adopting a variable universe fuzzy control algorithm; the estimated initial value of back electromotive force is filtered through a variable cut-off frequency filter to obtain a smooth estimated value ofback electromotive force; and variable lag compensation design is performed on the rotor position after filtering, and the rotor speed and the rotor position value of the motor are calculated. The buffeting phenomenon can be weakened, the rotor speed and position information estimation precision can be improved, and good dynamic characteristic is achieved.
Owner:HUBEI UNIV OF ARTS & SCI
Medium wave infrared continuous zooming optical system with high zoom ratio
ActiveCN103389570ACompact structureImprove detection distanceOptical elementsOphthalmologyImaging quality
The invention relates to a medium wave infrared continuous zooming optical system with high zoom ratio, belongs to the technical field of optic lens, and aims to solve the existent problems of long zooming stroke, large F value and more lens in the prior art. The system comprises a front fixing group, a lens A of a time changing group, a lens C of a compensation group, a lens B of the time changing group, a lens D of the compensation group, a back fixing group, a secondary image formation group and a probe, coaxially arranged from left to right in sequence, wherein the continuous zooming of the system is realized through the axial movement of the time changing group and the compensation group. Through adopting the structure that the lens A and the lens B of the time changing group and the lens C and the lens D of the compensation group are arranged in a crossing manner to move, the continuous zooming is realized, the zooming stroke is short, the curve is smooth, 100% cold light stop efficiency is satisfied, the F value is constant to be 2, the continuous zooming can be carried out within the range of 10 mm to 300 mm of focal distance, and the image formation quality is sound in the whole focal distance range.
Owner:长春长光睿视光电技术有限责任公司
Dual-polarized X-wave band radar ocean wave parameter measurement system
InactiveCN101639536AImprove observation accuracyExcellent observation accuracyRadio wave reradiation/reflectionRadarWave parameter
The invention discloses a dual-polarized X-wave band radar ocean wave parameter measurement system, comprising a radar, wherein the radar consists of a radar host and a dual-polarized antenna which isconnected with the radar host in a communicated manner; the radar host is connected with a data acquisition module of a computer; the data acquisition module converts video signal output by the radarinto digital signal and stores the digital signal in a memory unit of the computer; the computer is connected with a polarized switching control module by an I / O interface and is connected with the dual-polarized antenna by the polarized switching control module in a control manner; one end of the dual-polarized antenna is connected with the radar host in a communicated manner, and the other endthereof is connected with the polarized switching control module. The system can provide off-shore area ocean wave parameter information for all day in real time accurately, with the characteristics of security and non-easy lost, low maintenance cost, stable and reliable work, simple and easy operation, and can observe for a long term, therefore, the invention has good application value and marketprospects.
Owner:INST OF OCEANOLOGY - CHINESE ACAD OF SCI
All-zone couple source frequency domain magnetic depth measuring method and device
ActiveCN101261327AReduce workloadReduce the number of timesElectric/magnetic detectionAcoustic wave reradiationWave formMultiple frequency
The invention discloses a whole-zone electric coupling source frequency domain magnetic sounding method and a device thereof; the magnetic sounding method comprises the following steps: (1) a transmission power source (generating set) is arranged, the transmission power source is connected with a multiple frequency current transmission machine and the multiple frequency current transmission machine is connected with two current-supply electrodes A and B; (2) a transmission-reception distance r is selected, a reception magnetic probe is arranged and is connected with a reception machine; (3) the transmission power source, the multiple frequency current transmission machine and the reception machine are started, the multiple frequency current transmission machine transmits the current of designated wave form, voltage, volume as well as frequency to the underground via the current-supply electrodes A and B, the reception machine measures the magnetic field responses of each frequency component from the underground simultaneously, the relevant parameters are automatically stored into a memory and the apparent resistivity of near zone, far zone and medium zone can be automatically calculated respectively according to relevant formulas, automatically drawn out and stored. The invention also comprises the corresponding devices. The whole-zone electric coupling source frequency domain magnetic sounding method is suitable to be used for underground electrical distribution observation in the whole zone (including the near zone, the medium zone and the far zone), used for investigating underground geological structure and mineral product distribution or solving other engineering, hydrological as well as environmental geological problems, and has high observation efficiency, high accuracy and simple equipment.
Owner:湖南继善高科技有限公司
Down-hole all-directional tidal observation system
ActiveCN101201411AReliable observational dataPrecise and continuous observation dataTransmission systemsThermometers using electric/magnetic elementsObservation dataOmni directional
The invention discloses an omni-directional tide observation system under the well, which relates to a tide observation system. In the invention, a system mainframe box (B) on the ground (A) is connected with an instrument body (E) which is arranged in a protecting pipe (D) of a drilling well through the transmission cable (C). The structure of the interior of instrument body (E) comprises a hoisting hole (1), a pressing spring (3), a supporting pole (4), a location device (5), a ball head joint (6), a circuit unit, a gravimeter (9), a clinometer (11), a primary leveling device (12) and a precise leveling device (13), which are connected in turn from top to bottom. The invention integrates the gravity instrument with the clinometers, which is put under the well; the gravity solid tide in the upright direction and the horizontal solid tide in two directions can be observed synchronously at the same time and place; the invention provides reliable, precise and continuous observation data; the invention can also be used in a general cave with the qualification of a triangle base.
Owner:INST OF EARTHQUAKE CHINA EARTHQUAKE ADMINISTRATION
MIMO-SAR imaging method and device based on arc-shaped array antenna
ActiveCN104280735ATroubleshooting Imaging Processing IssuesHigh precisionSpecial data processing applicationsRadio wave reradiation/reflectionImaging processingMicrowave signals
The invention discloses an MIMO-SAR imaging method and device based on an arc-shaped array antenna. The method includes the steps that echo signals received by the arc-shaped array antenna are sampled, wherein the echo signals are formed by reflecting microwave signals transmitted by the arc-shaped array antenna through an observation scene; according to a sampling angle interval, the received echo signals are sorted, and arc-shaped array imaging data are acquired; distance direction inverse Fourier transformation is conducted on the arc-shaped array imaging data, and then distance compressed signals are acquired; deramping and residual video phase compensation are conducted on the distance compressed signals; distance direction Fourier transformation is conducted on the signals obtained after deramping and residual video phase compensation, and then distance wave number field signals are acquired; filtering and coherence stack imaging processing are conducted on the distance wave number field signals, and then image pixel values are acquired; based on the image pixel values, images are generated. Thus, the microwave imaging region range can be expanded, and effective imaging processing can be conducted on the arc-shaped array antenna signals.
Owner:INNER MONGOLIA UNIV OF TECH
Method and device for field observation of soil layer frost heaving of high speed railway in seasonal frozen soil region
ActiveCN104929098APrecise calculation of frost heaveCalculation of frost heaveIn situ soil foundationSoil scienceGelisol
The invention relates to a method and device for field observation of soil layer frost heaving of a high speed railway in a seasonal frozen soil region. An optical instrument used for observing seasonal frozen soil layer frost heaving amount cannot be used for observing the frost heaving amount of all layered soil in the freezing depth, precision is hard to meet, and professional instruments and observation technicians are needed for observation. The device is buried in a seasonal frozen soil layer and comprises a round-sheet-shaped lower anchor disc and a round-sheet-shaped upper anchor disc. A vertical measuring bar displacement meter is connected to the center of the lower anchor disc and the center of the upper anchor disc, and the measuring bar displacement meter is connected with a reading instrument arranged outside filled soil above the upper anchor disc through a transmission cable. Frost heaving deformation of the seasonal frozen soil layer drives the upper anchor disc and the lower anchor disc to move, and the measuring bar displacement meter is used for observing the variable quantity of the distance between the upper anchor disc and the lower anchor disc to reflect the frost heaving amount of the seasonal frozen soil layer. By means of the method and device, the total frost heaving amount of the seasonal frozen soil layer can be observed, and the frost heaving amount of all layered soil can be observed by setting devices of different lengths; the displacement meter is high in observation precision and efficiency, and automation of observation of frost heaving deformation can be achieved.
Owner:CHINA RAILWAY FIRST SURVEY & DESIGN INST GRP
Underneath pass existing railway bridge and culvert jacking horizontal guiding and deviation correcting system
ActiveCN104878701AWith automatic aiming functionAvoid manual aiming errorsBridge erection/assemblyLaser targetSynchronous control
The invention provides an underneath pass existing railway bridge and culvert jacking horizontal guiding and deviation correcting system which comprises a rearview prism, a laser target unit, a laser total station, a synchronous controller, a hydraulic jacking system and a main control computer. The initial posture and a theoretical design axis of a jacking bridge and culvert are determined through rearview orientation; the laser total station conducts tracking measurement on a target prism; the main control computer analyzes collected data and determines the real-time posture of the jacking bridge and culvert. When the horizontal deviation of the jacking bridge and culvert reaches an early warning value, the main control computer sends out a command, and deviation is corrected by adjusting the hydraulic jacking system. The underneath pass existing railway bridge and culvert jacking horizontal guiding and deviation correcting system is a laser guide and deviation correcting system and comprehensively utilizes the surveying and mapping technology, the laser sensing technology, the computer technology and the mechanical-electronic technology to guide jacking construction of the bridge and culvert, an advanced technological tool and an operation means are provided for mechanical construction of jacking of the bridge and culvert, the traditional operation mode is greatly changed, and favorable conditions are created for modern, automatic and digital development of measurement.
Owner:SOUTHEAST UNIV
Device and method for building trench slope gravity erosion process field test
InactiveCN103487567AReduce transportationEasy to transportEarth material testingField testsSpray nozzle
The invention discloses a device and method for building a trench slope gravity erosion process field test. The device comprises an outdoor test room, trench slope geography, a rainfall simulation device and a gravity erosion observation device. The outdoor test room comprises an outdoor test room body capable of being assembled and a movable rainproof observation room body placed inside the outdoor test room body. The trench slope geography is a generalization slope cut in a field according to typical geomorphic features of a studied area. The generalization slope is separated from the surrounding through steel sheet pile side walls. The rainfall simulation device comprises components including a three-barrel pressure-stabilizing water feeder, a movable assembling multi-micro-spraying-nozzle combined type rainfall device, a water collecting groove and the like. The gravity erosion observation device comprises a geography instrument main machine, a movable assembling slumping face observation support and a sight line calibrator. According to the device and method for building the trench slope gravity erosion process field test, a good observation environment is created for observation of a geography instrument through the test room, the main building components are all assembling movable facilities, the simulation and observation devices can not be disturbed, and observation accuracy is guaranteed.
Owner:DALIAN UNIV OF TECH
Microwave signal transmitting-receiving system, method and imaging system for MIMO-SAR imaging
ActiveCN104267400AAvoiding problems with beamwidth constraintsImprove securityRadio wave reradiation/reflectionMicrowave signalsEcho signal
The invention discloses a microwave signal transmitting-receiving system, method and imaging system for MIMO-SAR imaging. The transmitting-receiving system comprises an MIMO transmitting-receiving module used for generating and transmitting microwave signals, an arc array antenna and a microwave switching network, wherein the arc array antenna comprises an arc transmitting array antenna body and an arc receiving array antenna body, and the microwave switching network receives the microwave signals from the MIMO transmitting-receiving module, selects independent transmitting antenna array elements going to radiate the microwave signals from the arc transmitting array antenna body, and transmits the microwave signals to the selected independent transmitting antenna array elements. The microwave switching network further selects independent receiving antenna array elements going to receive echo signals from the arc receiving array antenna body, receives the echo signals from the selected independent receiving antenna array elements, and transmits the echo signals to the MIMO transmitting-receiving module. The MIMO transmitting-receiving module further receives the echo signals, and processes the echo signals so that digital echo signals can be formed. Accordingly, imaging observation in a large field range can be achieved.
Owner:INNER MONGOLIA UNIV OF TECH
Anti-interference optimal power tracking control method of interfered wind driven generator system
ActiveCN105156271AReduce the burden of estimationImprove estimation accuracyWind motor controlMachines/enginesWind drivenControl vector
The invention discloses an anti-interference optimal power tracking control method of an interfered wind driven generator system. According to the method, for strong interference and uncertainty existing in a permanent synchronous wind driven generator system, based on vector control, system identification and a combined tracking control method of a self-adaptation expansion state observer and model prediction optimal control are adopted, namely, according to measured actual rotation speed of a permanent synchronous wind driven generator and measured current information, partial model information and the interference value observed by the self-adaptation expansion state observer are identified and introduced into a prediction model. In this way, a combined prediction model containing interference information and uncertainty is obtained and more ideal and accurate for the wind driven generator system, model prediction optimal control exerts closed-loop adjusting capacity easily, and while a closed-loop system restrains external interference of the wind driven generator, an optimized high-performance power tracking result can be obtained.
Owner:YANGZHOU UNIV
Sensorless control method for permanent magnet synchronous motor based on sliding mode observer
InactiveCN108599645AImprove dynamic performanceReduce chatteringElectronic commutation motor controlVector control systemsMathematical modelPermanent magnet synchronous motor
The invention discloses a sensorless control method for a permanent magnet synchronous motor based on a sliding mode observer, which specifically comprises the following steps: firstly, according to amathematical model of a surface-mount permanent magnet synchronous motor in a two-phase stationary coordinate system, using an observation error of stator current as a sliding mode surface to write asliding mode current observer equation; then, carrying out the stability analysis of the sliding mode current observer equation; based on the sliding mode current observer, constructing a back electromotive force observer equation on the basis of a back electromotive force model for separating a back electromotive force signal and then estimating the rotor position and rotational speed, and carrying out the stability analysis of the back electromotive force observer equation; secondly, based on the sliding mode current observer, identifying the stator resistance of the motor; and finally, adjusting the feedback gain in real time according to the running speed of the motor. The sensorless control method for the permanent magnet synchronous motor based on the sliding mode observer in the invention solves the problem that the chattering phenomenon of the observation signal in the sliding mode observer existing in the prior art is big, low-pass filtering and rotor angle compensation are required, and the observation precision is not high.
Owner:XIAN UNIV OF TECH
Couple source frequency domain electric sounding method and apparatus suitable for quasi far zone
ActiveCN101216566AImprove ergonomicsHigh precisionElectric/magnetic detectionAcoustic wave reradiationTransmitted powerEngineering
The invention relates to an electric dipole frequency domain electrical sounding method and a device suitable for quasi far field. The method comprises the following steps of : arranging transmission of power supply in a specified exploration region; transmitting power generated by the power supply to a multi-frequency current transmitter, which generates a current containing n main frequency components and transmits the current to the ground through a transmitting electrode; arranging receiving electrodes in a selected transmitting-receiving distance and measuring the transmitting-receiving distance r; transmitting ground-generated voltage response containing electric distribution information into a multi-frequency voltage receiver through a receiving electrode, measuring the voltage response containing n main frequency components from the ground by the receiver through the receiving electrode, d by the invention, etc. The invention also includes a relevant device. The invention has the advantages of simple instrument equipment and easy measurement procedure, and requires no measurement for quasi far field. The invention is suitable for sounding underground geological structure, mineral distribution, etc. in quasi far field.
Owner:湖南继善高科技有限公司
Permanent-magnet spherical motor rotor self-adapting control system based on dynamic friction compensation
ActiveCN103780188AReduce complexityLow hardware requirementsElectronic commutation motor controlVector control systemsControl systemState observer
The invention discloses a permanent-magnet spherical motor rotor self-adapting control system based on dynamic friction compensation. The system is characterized in that a permanent-magnet spherical motor rotor servers as a controlled object, and the control system is set to comprise a parameter self-adaptation adjustment module, a dynamic friction state observation module, a dynamic friction feedforward compensation module and a calculation moment module. The parameter self-adaptation adjustment module obtains adjustment parameters of the calculation moment module and the dynamic friction feedborward compensation module by real-time calculation achieved in a self-adaptation algorithm. The dynamic friction state observation module is composed of two state observers with two different dynamic items and is used for calculating state quantity estimation value in a dynamic friction model in real time. The dynamic friction feedforward compensation module calculates in real time to obtain a friction compensation moment tfc. The calculation moment module calculates to obtain a main control moment tc. The total control moment t of the controlled object is set to be t=tfc+tc. According to the control system, dynamic friction compensation of the permanent-magnet spherical motor rotor is achieved, and accordingly control precision is improved, and starting moment is reduced.
Owner:ANHUI UNIVERSITY
Ocean salinity satellite based on joint detection of multiple remote sensors
ActiveCN107300561AImprove observation accuracyImprove inversion accuracy and data application capabilitiesMaterial analysis using microwave meansPhysicsObservation data
The invention provides an ocean salinity satellite based on joint detection of multiple remote sensors, Moreover, the multiple remote sensors are arranged to detect the ocean salinity synchronously, and the multiple remote sensors are arranged on a platform of an ocean salinity detection remote sensing satellite, and at least comprise an L wave band two-dimensional synthetic aperture microwave radiometer, an L wave band one-dimensional synthetic aperture microwave radiometer, an L wave band digital beam forming scatterometer, a C wave band microwave radiometer, a Ku wave band microwave radiometer, and a K wave band microwave radiometer. Therefore, the means of joint observation and reversed return observation is adopted, the combination of high resolution and high stability is completed, and the ocean salinity satellite also has the capability of accurately adjusting the brightness temperature of an L wave band through the reversed return observation data. At the same time, a plurality of frequency bands of a one-dimensional synthetic aperture and the scatterometer share a same cylindrical reflector antenna, so that the complexity of a system is reduced.
Owner:BEIJING INST OF SPACECRAFT SYST ENG
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