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88 results about "Time inversion" patented technology
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Inversion time. An MRI term for the time period between the 180° inversion pulse and the 90° excitation pulse in an inversion recovery pulse sequence.
Efficient Method Based on the Electromagnetic Time Reversal to Locate Faults in Power Network
ActiveUS20140300370A1Fault location by conductor typesInformation technology support systemElectrical conductorObservation point
A time reversal process for determining a fault location in an electrical power network comprising multi-conductor lines, comprises measuring at an observation point located anywhere along one of the multi-conductor lines, for each of the conductors of the multi-conductor line, respectively a fault-originated electromagnetic transient signal; defining a set of guessed fault locations each having a different determined location in the electrical power network, and each of the guessed fault locations is attributed a same arbitrary fault impedance; defining a network model for the electrical power network, based on its topology and multi-conductor lines electrical parameters capable of reproducing in the network model the electromagnetic traveling waves; and computing for each conductor a time inversion of the measured fault-originated electromagnetic transients signal. The time reversal process method further comprises, as detailed herein, back-injecting a computed time inversion; calculating fault current signal energy; and identifying the fault location.
Owner:ECOLE POLYTECHNIQUE FEDERALE DE LAUSANNE (EPFL)
Electromagnetic-signal-time-inversion-based fault point positioning method for transmission line
ActiveCN108693444ALow costReduce the impact of noiseFault location by conductor typesFault location by pulse reflection methodsObservation pointEngineering
The invention relates to an electromagnetic-signal-time-inversion-based fault point positioning method for a transmission line. On the basis of an electromagnetic time inversion principle, a single observation point is set at any terminal in a power distribution network and a fault high-frequency transient signal within a limited period of time is measured and recorded; and time inverted sequenceprocessing is carried out on the measured signal, the processed signal is injected into a power distribution network simulation calculation model at an observation point, norm values at different guess positions in the power distribution network are calculated, and a fault position is determined by searching for a maximum peak value and a maximum energy root value. According to the method different form the traditional traveling wave determining method and impedance method, a power distribution network with a complex topological structure can be covered by one observation point without being affected by the fault impedance; and the excellent anti-noise performance is realized. The electromagnetic-signal-time-inversion-based fault point positioning method has the great practical value in fault positioning of the transmission line.
Owner:XI AN JIAOTONG UNIV
Application Method of Online Charging System in Arrears Risk Control System
An application method of On-line Charging System in Arrears Risk Control System: 1) The subsystem of OCS, Mediation, communicates with CC Client, receives a credit control request raised by the CC Client and processes with a fault-tolerant management. 2) The Credit Control analyses call request, identifies a type of service and request, selects necessary service transaction logic, and judges an authorized quota of the service, after receiving the quota, the Credit Control requests for real time forward modeling from the Rating. 3) After receiving a price of the service, the Credit Control requests real time inversion from the Rating and meanwhile transfers the price to the Rating. 4) The Rating requests account comparison from the Account after receiving the price. 5) The Account compares the price with a customer's account information to make decision of subsistence lock, if there is enough balance in the account, then the fee of the price will be deducted from the balance and then locked. 6) The Account returns the account information of the compared result. 7) The Rating inverses the authorization amount according to the compared result returned by the Account, and send back to the Credit Control. 8) The Credit Control constructs a service relevant responding package according to the authorization amount, and sends the responding package to the Mediation to complete the OCS processing flow.
Owner:LINKAGE TECH GROUP +1
Simultaneous relaxation time inversion
ActiveUS20110025324A1Electric/magnetic detection for well-loggingMeasurements using NMR imaging systemsNMR - Nuclear magnetic resonanceI e ratio
In some embodiments, apparatus and systems, as well as methods, may operate to acquire fluid signature data representing a plurality of nuclear magnetic resonance echo trains associated with fluids in a material, to simultaneously invert a plurality of relaxation time models to provide inverted results, and to determine fluid properties using the inverted results. The relaxation time models may be associated with the fluids using the fluid signature data after constraining ratios of T1 relaxation times to T2 relaxation times.
Owner:HALLIBURTON ENERGY SERVICES INC
Resistivity real-time imaging monitoring method and system for water-bursting geological disaster in construction period of underground engineering
InactiveCN102495428ATimely warningIntuitive evaluation of water inrush statusElectric/magnetic detectionAcoustic wave reradiationData acquisitionTime dynamics
The invention discloses a resistivity real-time imaging monitoring method and a resistivity real-time imaging monitoring system for a water-bursting geological disaster in a construction period of underground engineering. The method comprises a data acquisition method, a data transmission method, a data real-time inversion and imaging method and a catastrophe premonition identification and early warning method. The invention also relates to the resistivity real-time imaging monitoring system for the water-bursting geological disaster in the construction period of the underground engineering. The system consists of a data acquisition subsystem, a data transmission subsystem, a data processing (data real-time inversion and imaging) subsystem and an early warning subsystem. The invention has the advantages that: data are acquired, transmitted, inverted and imaged in real time; a real-time dynamic image of crack generation, expansion and penetration can be effectively obtained; information such as the generation position and formation process of main cracks and burst water seepage channels is obtained; a series of premonition information can be successfully obtained; and geological disasters can be forecast and timely warned.
Owner:SHANDONG UNIV
Laser methane concentration measuring method based on double-spectrum absorption line and waveform matching
InactiveCN105044026ACancel noiseEliminate distractionsColor/spectral properties measurementsLength waveGas concentration
The invention discloses a laser methane concentration measuring method based on double-spectrum absorption line and waveform matching. A semiconductor laser performs wavelength linear scanning and covering on two specified absorption lines, laser passing through a gas to be measured is subjected to processing such as narrow-band band-pass filtering and high-speed acquisition by a receiving circuit and then subjected to waveform matching with a reference absorption line, various noises and interference removal and an actual absorption line retaining, and finally, real-time inversion of the concentration of the gas to be measured is carried out by adopting a double-spectrum absorption line concentration inversion algorithm. The laser methane concentration measuring method disclosed by the invention solves the contradiction widely existing in the conventional application of a laser absorption spectrum technology in gas concentration measurement that measurement range and minimum detection limit are difficult to consider, expands the concentration measurement range while ensuring the minimum detection limit of laser methane concentration measurement, solves the problem of concentration misinformation of a measuring system caused by optical and electrical interference, and ensures the measurement accuracy.
Owner:安徽中科瀚海光电技术发展有限公司
Mine water damage microseismic monitoring time-space cluster analysis method
InactiveCN107203003ARealize continuous real-time inversionImprove intelligent early warning capabilitiesWater resource assessmentSeismic signal processingTime domainWater resources
Owner:HEBEI COAL SCI RES INST
Ultrasonic transcranial focusing method
ActiveCN104545919AImprove accuracyImprove treatment efficiencyUltrasound therapyComputerised tomographsUltrasonic sensorSonification
The invention provides an ultrasonic transcranial focusing method. The utrasonic transcranial focusing method comprises obtaining a skull image of a patient and reestablishing a three-dimensional digital model of a skull of the patient; guiding the three-dimensional digital model of the skull into a three-dimensional printer to obtain a corresponding skull entity model; performing time inversion on the skull entity model to obtain an ultrasonic transcranial focusing emission sequence. Accordingly, the entity model of the skull of the patient is accurately copied by a three-dimensional printing technology, the personalized ultrasonic transcranial focusing emission sequence is established outside the body of the patient by a time inversion method, and accordingly the accurate focusing is implemented and the accuracy, the treatment efficiency and the safety of the utrasonic deep brain stimulation can be effectively improved.
Owner:GREEN VALLEY BRAINTECH SHENZHEN MEDICAL TECH CO LTD
Target location method in specific environment and based on active radio frequency identification device (RFID) and system thereof
The invention discloses a target location method in specific environment and based on an active radio frequency identification device (RFID) and a system thereof, which adopt the mode of time inversion, are capable of conducting real-time high-accuracy location on an active RFID label on the premise that indoor environment is not modified, conduct simulation of the communication process of electromagnetic wave after the time inversion in a simulation environment, determine the position of a target to be located by reading peak value of energy of an electromagnetic field, and overcome the shortcoming that the traditional location accuracy relies on complexity of environment. The time inversion process is not finished on the target to be located, so that complexity and cost of the target to be located are reduced. A real transmitter is not required, so that complexity and cost of a signal processing mechanism are reduced. The simulation environment built in the signal processing mechanism corresponds to the real specific environment, and the multi-diameter and multi-scattering conditions can all be fully utilized in the time inversion process. Compared with the prior location mode, the method and the system reduce arrangement number of fixed antenna and reduce system cost.
Owner:KUNCHEN TECH CO LTD
Precoding technique in massive MIMO network based on time inversion
InactiveCN109120320AReduce distractionsImprove signal-to-interference ratioRadio transmissionTransmitter/receiver shaping networksZero-forcing precodingEngineering
The invention relates to a precoding technique in a massive MIMO network based on time inversion, specifically relates to the fusion and improvement of the time inversion technique and the precoding technique in the massive MIMO network, and achieves the purpose of interference inhibition. The channel optimization of the technique is performed on the basis of the time inversion technique, and thetechnique achieves the energy gathering through the spatiotemporal focusing of the time inversion technique. The improvement is achieved on the basis of the zero-forcing precoding technique, and the technique reduces the inter-user interference and co-channel interference in the massive MIMO network through the zero-forcing precoding technique in a multi-path environment, thereby achieving the interference inhibition. A receiving end antenna can obtain the channel state information of a multi-path channel at a base station antenna end through the channel detection, and the up-sampling is performed on the base station antenna so as to reduce the signal transmission rate. The inter-user interference and co-channel interference are reduced under the condition of the multi-path channel throughthe zero-forcing precoding technique, so the technique provided by the invention can enable the mean bit error rate to be reduced, and remarkably improves the SINR (Signal to Interference plus NoiseRatio) and the achievable rate of the massive MIMO system.
Owner:CHONGQING UNIV OF POSTS & TELECOMM
A wireless common-source wireless energy transmission method and system
ActiveCN109038861ATroubleshoot wireless sync issuesStable phase differenceCircuit arrangementsStable phaseTransmit array
The invention discloses a wireless common-source wireless energy transmission method and system. The system consists of a wireless common source device, N TR energy transmission devices, and M users,wherein M and N are positive integers. The method comprises the following steps: the wireless common-source device radiates a single-frequency common-source signal to the surrounding space through a transmitting antenna of the wireless common-source device; The N TR energy transmission devices receive the common source signals through their own receiving antennas, and generate N TR energy transmission signals with specific amplitudes and phases through phase shifting and amplification operations. The N TR energy transmission devices simultaneously radiate the N TR energy transmission signals through their own transmitting antennas to generate a required single-point or multi-point focusing field to charge one or more of the M subscribers. The N TR energy transmission devices simultaneouslyradiate the N TR energy transmission signals through their own transmitting antennas to generate a single-point or multi-point focusing field to charge one or more of the M subscribers. The N TR energy transmission devices have no source, share the same radio source, and can maintain stable phase difference between each other. Therefore, the technical scheme of the invention can be used for solving the wireless synchronization problem between a plurality of spatially separated time inversion TR transmitting array elements.
Owner:深圳市宇能无线技术有限公司
Magnetotelluric synchronizing detection and real-time inversion method and system
ActiveCN108107478AImprove work efficiencyImproving Observational Data QualitySeismology for water-loggingDetection using electromagnetic wavesMeasurement pointObservation data
The present invention discloses a magnetotelluric synchronizing detection and real-time inversion method and system. The system comprises a detection inversion host (M) with a wireless networking function and N<2>-1 detection inversion extensions (Si) with wireless communication functions, wherein the distance between each two detection inversion extensions is D, i=1, 2, ..., N<2>-1, and N is an odd number. The detection inversion host is used for collection of magnetic field signals and electric field signals of measurement points, wireless networking and cooperation, synchronizing detectionand real-time inversion control of the detection inversion extensions in a detection area, and the detection inversion extensions are used for synchronizing collection of electric field signals of themeasurement points and real-time inversion of detection data of the measurement points under the cooperative control of the detection inversion host. The detection inversion host and the detection inversion extensions synchronously perform detection and inversion in real time to avoid that a time-space factor influences improvement of observation data quality while improving the work efficiency,and therefore the magnetotelluric synchronizing detection and real-time inversion method and system can be widely used in fields of underground mineral resource detection, construction detection of the earth's crust and the upper mantle and the like.
Owner:HUNAN UNIV OF SCI & TECH
Spatial multiplexing TR equalizer design based on SIMO-UWB system
InactiveCN108449293AReduce complexityGuaranteed reliabilityTransmitter/receiver shaping networksChannel parameterEngineering
The present invention relates to the technical field of wireless communications, in particular to a spatial multiplexing TR equalizer design based on a SIMO-UWB system, which comprises that a transmitting end transmits a detected signal; a receiving end estimates a channel type according to a channel state; according to different channel types, a channel transmission model is established, and channel parameters are estimated; the estimated channel parameters are fed back to the transmitting end and a time inversion mirror by the receiving end; the equalizer is designed by using the space-timefocusing characteristic of the time inversion technology; power control is carried out on the equalizer, and TR pre-filter cascade is used for the SIMO-UWB system. According to the equalizer design inthe invention, multi-code stream interference and inter-symbol interference in the SIMO-UWB system are reduced under the premise of ensuring normal communication of the system, the system complexityis reduced, and the performance of the system is greatly improved.
Owner:CHONGQING UNIV OF POSTS & TELECOMM
Efficient method based on the electromagnetic time reversal to locate faults in power network
ActiveUS9465067B2Fault location by conductor typesInformation technology support systemElectricityElectrical conductor
A time reversal process for determining a fault location in an electrical power network comprising multi-conductor lines, comprises measuring at an observation point located anywhere along one of the multi-conductor lines, for each of the conductors of the multi-conductor line, respectively a fault-originated electromagnetic transient signal; defining a set of guessed fault locations each having a different determined location in the electrical power network, and each of the guessed fault locations is attributed a same arbitrary fault impedance; defining a network model for the electrical power network, based on its topology and multi-conductor lines electrical parameters capable of reproducing in the network model the electromagnetic traveling waves; and computing for each conductor a time inversion of the measured fault-originated electromagnetic transients signal. The time reversal process method further comprises, as detailed herein, back-injecting a computed time inversion; calculating fault current signal energy; and identifying the fault location.
Owner:ECOLE POLYTECHNIQUE FEDERALE DE LAUSANNE (EPFL)
Method for investigating failure connection of engineering structure by signal focus
ActiveCN101000325AEasy extractionHigh sensitivityAnalysing solids using sonic/ultrasonic/infrasonic wavesProcessing detected response signalElectricityAudio power amplifier
The invention discloses a method used signal focalizing to monitor engineering structure connecting failure. It includes the following steps: collecting structure response signal; time inversion processing; sensing signal focalizing; characteristic parameter extracting and structure health identifying. It can increase sensitivity for the structure connecting failure monitoring method based on acoustic excitation, be good for the practicality of the technique, and actualized method.
Owner:NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
Conductivity image reconstructing method for magneto-thermoacoustic coupled tomography
A conductivity image reconstructing method for magneto-thermoacoustic coupled tomography includes: acquiring a thermoacoustic source distribution of a conductive object by means of time inversion according to an electromagnetic ultrasonic signal received, and performing reconstruction according to the thermoacoustic source distribution to obtain a conductivity distribution of the conductive object. Specially, the method includes: acquiring a thermoacoustic source on a certain level by means of time inversion, acquiring a thermoacoustic source of the conductive object by means of interpolation, performing calculation by means of Biot-Savart's law according to excitation current to obtain a spatial component A1 of primary magnetic vector potential, subjecting the conductive object to spatial discretization, giving an initial value [Sigma]<0> of conductivity, according to the theorem of current continuity, solving a spatial component [Phi] <1> of scalar potential with the initial value [Sigma]<0> and the spatial component A1, substituting the spatial component [Phi]<1> of the scalar potential to a relation which the thermoacoustic source and conductivity meet so as to obtain updated conductivity [Sigma]<1>, replacing the initial value [Sigma]<0> with the updated conductivity [Sigma]<1>, repeating the process above, and stopping iteration until a relative error of the conductivity meets an equation: Sigma=||([Sigma]1-[Sigma]0) / [Sigma]0||2<=Sigma0.
Owner:INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
Multi-antenna diversity receiving method and device based on time inversion
InactiveCN102404039AImprove signal to noise ratioAchieving multipath diversitySpatial transmit diversityChannel parameterDiversity scheme
The invention discloses a multi-antenna diversity receiving method and device based on time inversion. The method comprises the following steps of: firstly, carrying out down-conversion treatment on radio frequency signals received by antennas respectively to obtain multiple unrelated compound baseband signals; next, carrying out channel evaluation respectively according to the obtained compound baseband signals to obtain independent transmission channel parameters of receiving antennas; then, working out time inversion conjugate formulae of channels according to the evaluated channel parameters; and then, carrying out convolution operation on the compound baseband signals received by the antennas and the time inversion conjugate formulae of corresponding transmission channels respectively; finally, processing the convolution result by an equal gain combination method to obtain a final multi-antenna diversity result. According to the method and device disclosed by the invention, the signal-to-noise ratio of the received signal can be increased, combination and balance strategies are simplified, and the performance of the wireless communication system is improved.
Owner:GUILIN UNIV OF ELECTRONIC TECH
Simultaneous relaxation time inversion
ActiveUS8395384B2Electric/magnetic detection for well-loggingAnalysis using nuclear magnetic resonanceNMR - Nuclear magnetic resonanceEnvironmental geology
In some embodiments, apparatus and systems, as well as methods, may operate to acquire fluid signature data representing a plurality of nuclear magnetic resonance echo trains associated with fluids in a material, to simultaneously invert a plurality of relaxation time models to provide inverted results, and to determine fluid properties using the inverted results. The relaxation time models may be associated with the fluids using the fluid signature data after constraining ratios of T1 relaxation times to T2 relaxation times.
Owner:HALLIBURTON ENERGY SERVICES INC
Real-time inversion analysis method of concrete dam block surface heat emission coefficient
ActiveCN110055927AReduce the numberRealize automatic inversionBarrages/weirsHydraulic engineering apparatusTemperature controlFinite element method
The invention provides a real-time inversion analysis method of concrete dam block surface heat emission coefficient. The real-time inversion analysis method monitors climatic conditions around a damblock, dam block surface temperature and a temperature inside the dam block in real time; temperature variation parameters inside the dam body are calculated by a direct solution method, by combiningwith shape parameters and material thermodynamic and mechanical parameters of the dam body, an interpolation and iteration method is used for inversely analyzing and determining the dam block surfaceheat emission coefficient based on a finite element method, temperature control and cracking prevention can be carried out better, and the accuracy and calculation efficiency are higher.
Owner:CHINA INST OF WATER RESOURCES & HYDROPOWER RES +1
Device for performing synchronous focusing shaping on distorted femtosecond laser pulse and control method
InactiveCN110048293ASolve dispersionAchieve spatial resolutionLaser detailsOptical elementsTime distortionBeam splitter
The invention relates to a method for performing focusing shaping control on a distorted femtosecond laser pulse. The method is characterized in that an optical inverse diffusion algorithm is writtenaccording to a time inversion principle; a phase shift holographic algorithm is written according to a holographic interference principle; light beams output from a laser 1 are incident on a beam splitter 2 and are divided into two parts, one part entering a sample light path 3.1-8 and the other part entering a reference light path 3.2-8. The light beams in the reference light path 3.2-8 are reflected onto an isosceles prism 10 by a second mirror 3.2 and a third mirror 3.3, the light beams are reflected to a fourth mirror 3.4 by the isosceles prism 10, and the light beams are reflected by thefourth mirror 3.4 and then input to a two-dimensional spectrometer 8. According to the method in the invention, the spatial freedom of the wave-front in a spatial light modulator is controlled by running the optical inverse diffusion algorithm through a computer, thereby realizing simultaneous focusing shaping control on the spatial distortion and time distortion of the femtosecond laser pulse.
Owner:HARBIN INST OF TECH AT WEIHAI
Time inversion transformation method and system for electromagnetic signal
InactiveCN104777519AApply real-time inversion transformationThe process is simple and convenientElectric/magnetic detectionAcoustic wave reradiationTime domainEngineering
The invention discloses a time inversion transformation method and a time inversion transformation system for an electromagnetic signal, and relates to the technical field of microwaves. The time inversion transformation system comprises two leaky-wave apparatuses and two Rotman lenses and completes the time inversion of a signal waveform by two Fourier transforms, and the process is simple. The time inversion transformation system is implemented by a microwave passive device, is simple in circuit principle, compact in structure and easy to implement. The number of input and output terminals of the Rotman lenses can be adjusted so as to meet the requirements on different accuracies of the inversion transformation of a time domain signal. The leaky-wave apparatuses can convert the time domain signal into an air domain signal, and a high-speed microwave switch ensures the accuracy of signal inversion transmission of the whole system. The time inversion transformation method and the time inversion transformation system for the electromagnetic signal can implement the high-speed, high-efficiency and real-time inversion transformation of the microwave signal, and can be applied to a time inversion electromagnetic application system.
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA
Autonomous dynamic wireless electric energy receiving device and method based on time inversion
ActiveCN110120711AImprove transmission efficiencyEliminate channel differencesBatteries circuit arrangementsElectric powerTransmission channelComputer terminal
The invention discloses an autonomous dynamic wireless power receiving device and method based on time inversion, and belongs to the technical field of wireless power transmission. According to the invention, the device achieves the uplink and downlink isolation of an energy transmission request signal and a time inversion return signal by using a transceiving isolation module, and achieves the transmission of the energy transmission request signal and the receiving of a time inversion return signal are transmitted through the same port of the same antenna, thereby eliminating the channel difference between the transmission process of the energy transmission request signal and the return process of the time inversion signal, and improving the wireless energy transmission efficiency. According to the invention, the device can control the starting stage, the stable transmission stage and the terminating stage of wireless electric energy transmission and the re-transmission of electric energy due to the movement of the receiving device and the change of transmission channel parameters, and achieves the purpose that a mobile receiving terminal autonomously completes the whole process of inversion of wireless electric energy receiving. According to the invention, the device can achieve the high-efficiency, movable and manual intervention-free autonomous time inversion wireless electric energy receiving.
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA
Same-time same-frequency duplex electromagnetic communication method based on time reversal
InactiveCN106253939AReduce complexitySuppression of self-jamming signalsLine-faulsts/interference reductionDuplex signal operationSelf interferenceSystem capacity
The invention discloses a same-time same-frequency duplex electromagnetic communication method based on time reversal, relating to the technical field of microwave. The time-space focusing and super-resolution focusing properties of time reversal electromagnetic wave are used, only through the separation of a sub wavelength interval of the receiving and transmitting ends of two communication parties, the effective inhibition of self interference signals of the receiving and transmitting ends of a same communication party can be realized. At the same time, since the time inversion technology is used, even the interval between antenna units is in a sub wavelength state, the corresponding receiving and transmitting channels are still independent, thus according to the method provided by the invention, the communication module complexity can be reduced, the communication rate can be increased, and the system capacity is increased.
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA
Monitoring and early warning system for comprehensive pipe gallery
InactiveCN110397080AReal-timeRealize early warningArtificial islandsUnderwater structuresEarly warning systemIntelligence analysis
The invention provides a monitoring and early warning system for a comprehensive pipe gallery. An intelligent sensing original part and monitoring equipment are arranged in the comprehensive pipe gallery. The monitoring and early warning system for the comprehensive pipe gallery comprises a data and information module, a numerical value calculating module, an artificial intelligence analyzing module and a monitoring and early warning module, wherein the data and information module is used for collecting and sorting data acquired by the intelligent sensing original part and the monitoring equipment; the numerical value calculating module is used for carrying out real-time inversion analysis on the data; the artificial intelligence analysis module is used for intelligently analyzing characteristics and rules of the data acquired by the intelligent sensing original part and the monitoring equipment; and the monitoring and early warning module is used for carrying out safety analysis on the comprehensive pipe gallery, establishing a pipe gallery safety evaluation model, and providing safety evaluation and health diagnosis reports. According to the monitoring and early warning system for the comprehensive pipe gallery, the artificial intelligence analysis module is utilized to carry out intelligent analysis, the numerical value calculating module is used to carry out real-time inversion analysis on the data, and thus, real-time diagnosis and early warning on the health state of the comprehensive pipe gallery are realized.
Owner:深圳市大源装饰有限公司
High-efficiency and high-power microwave space power synthesis method
InactiveCN106684573ARelieve painImprove power combining efficiencyAntenna arraysCoupling devicesMicrowaveSynthesis methods
The invention discloses a high-efficiency and high-power microwave space power synthesis method. According to the method, power synthesis of wave beams radiated by a plurality of antennas is performed in the space. The method includes the following steps that: 1) a time inversion antenna array is set at one side of a detection area, one antenna unit is arbitrarily selected to emit weak signals to detect a non-cooperative target, the main emission direction of each antenna is determined according to echoes, and the physical direction of the antenna unit is adjusted according to the main emission direction so as to be consistent with the main emission direction, and a space-frequency multi-state response matrix is built, and time inversion signals corresponding to the target are obtained; and 2) the time inversion antenna array increases power to transmit the time inversion signals obtained in the step 1) and focuses the time inversion signals at the location of the target. According to the high-efficiency and high-power microwave space power synthesis method of the invention, the time inversion algorithm is adopted to realize spatial power synthesis, and therefore, the efficiency of power synthesis is improved, and an adaptive focusing ability can be realized; and non-cooperative target detection and spatial power synthesis are integrated, and therefore, and high-power microwave space power synthesis is efficiently achieved.
Owner:SOUTHWEST JIAOTONG UNIV
Microseismic damage reconstruction-based mining-induced stress evaluation method
ActiveCN110118991AThe physical and mechanical significance is obviousCalculations are clearForce measurementSeismic signal processingStress distributionEngineering
The invention relates to a microseismic damage reconstruction based mining-induced stress evaluation method, and is suitable for use in the field of microseismic monitoring in the field of mine safety. The method specifically comprises the steps of carrying out grid partition on an evaluation area; calculating cumulative deformation energy Epsilon Ei and a microseismic event number or a coal rockloading time Delta ti of each grid node by adoption of an accumulation method; finding out a maximum cumulative deformation energy value max {Epsilon Ei} of the evaluation area and calculating averagecumulative deformation energy Epsilon F; and obtaining mining-induced stress distribution on the basis of calculating damage parameter D distribution. The method has obvious physical and mechanical significance, has involved parameters which are clear and strong in universality and operability, is suitable for programming, has good application feasibility, and can realize approximate real-time inversion of mining-induced stress in coal seam mining processes.
Owner:CHINA UNIV OF MINING & TECH
Lesion area imaging system and method
InactiveCN104101877AImprove signal-to-noise ratioReduce weakeningDiagnostic recording/measuringSensorsSignal-to-noise ratio (imaging)Imaging processing
The invention relates to a lesion area imaging system and method. The system comprises a signal source module, a transmitting antenna array module, a receiving antenna array module, a signal control module and an image processing module. The signal source module is used for generating a pulse signal. The transmitting antenna array module is used for transmitting the pulse signal to a lesion area. The receiving antenna array module is used for receiving a first echo signal which is generated for the pulse signal. The signal control module is used for carrying out time inversion on the first echo signal to acquire an inversion signal. The transmitting antenna array module is further used for transmitting the inversion signal to the lesion area. The receiving antenna array module is further used for receiving a second echo signal which is generated for the inversion signal. The signal control module is further used for extracting target information in the second echo signal. The image processing module is used for carrying out imaging according to the target information. The signal-to-noise ratio is improved, and the image quality is improved.
Owner:SHENZHEN INST OF ADVANCED TECH
Method for generating non-diffraction Bessel wave based on time inversion
ActiveCN109586033AHigh precisionOvercoming the Difficulty of Time Reversal OperationCircuit arrangementsAntennasMicrowaveWave field
The invention discloses a method for generating a non-diffraction Bessel wave based on time inversion and relates to the field of electromagnetic beamforming. The method comprises a step 1 of selecting a cross section as an initial wave emission surface according to the electric field and magnetic field distribution of the Bessel wave, obtaining the initial wave emission surface field distributionand calculating the maximum non-diffraction distance of the initial wave according to the field distribution; a step 2 of emitting the initial wave to propagate the initial wave in a free space, andintercepting an electric field at the maximum non-diffraction distance to obtain electric field values at various positions of the initial wave emission surface; and a step 3 of performing, after theelectric field value of the initial wave emission surface is discretized, a time inversion operation to obtain an inversion Bessel wave, emitting the inversion Bessel wave to propagate the inversion Bessel wave in the same free space and to generate a non-diffraction Bessel wave. The method solves the problem that the existing non-diffraction distance of the Bessel wave generated in the microwavefrequency band is short, and achieves an effect of greatly increasing the non-diffraction distance of the Bessel wave field.
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA
Acquiring contrast-enhanced, T1-weighted, cine magnetic resonance images
InactiveCN1692880ADecrease in the number of closed interestShorten the timeOther printing matterMagnetic property measurementsInversion recoveryCardiac cycle
A method of magnetic resonance imaging of an anatomical site subject to a motion cycle (e.g., the heart during a cardiac cycle), comprising: administering a magnetic resonance contrast agent; waiting for a period of time until the contrast agent is effective to cause a selected portion of the anatomical site (e.g., dead heart tissue) has a different T1 recovery rate than other parts (normal heart tissue); give multiple time-spaced inversion recovery pulses; follow inversion recovery pulses in time spaced by known time intervals Acquire image data at data acquisition time; vary the time at which an inversion recovery pulse is given within a motion cycle so that the relevant data acquisition time is at multiple phases of the motion cycle; process image data acquired at a certain phase of the motion cycle to produce an at least a portion of the image frames of the phase; and performing the processing on a plurality of phases of the motion cycle to generate a plurality of image frames corresponding to the plurality of phases.
Owner:SIEMENS MEDICAL SOLUTIONS USA INC +2
Time-inversion super-resolution pipeline leakage monitoring method
ActiveCN108120573ALow costHigh-resolutionFluid-tightness measurement using electric meansTime domainImage resolution
The invention discloses a time-inversion super-resolution pipeline leakage monitoring method. Compared with the prior art, the invention has the advantages as follows: in allusion to the defect that ametamaterial component is required to be used near a signal source for achieving super-resolution imaging positioning in a conventional scheme, a time-inversion super-resolution time domain adjustment function is provided and designed, and through adjustment of the function, the resolution can be increased and a resolution diffraction limit can be broken through. By the time-inversion super-resolution pipeline leakage monitoring method, super-resolution is achieved by an algorithm and the metamaterial component is not required to be used, so that the time-inversion super-resolution pipeline leakage monitoring method has higher practicality and lower cost than the conventional time-reversion super-resolution imaging positioning scheme. Therefore, by using the novel technology, low-cost andsuperhigh-resolution leakage monitoring of a long-distance gas pipeline can be achieved.
Owner:DONGGUAN UNIV OF TECH
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