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35results about How to "Reduce measurement complexity" patented technology
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Communication method, base station, and user equipment
ActiveCN103688474AIncrease flexibilityReduce measurement complexitySpatial transmit diversityTransmission monitoringUser equipmentVIT signals
The embodiment of the invention provides a communication method, a base station, and user equipment. The method comprises the steps: forming m wave beams through employing a mode of antenna weighting, wherein the m is a positive integer which is greater than 1; determining the uplink receiving power of each of the m wave beams according to an uplink detection signal of the user equipment (UE); selecting n wave beams from the m wave beams according to an uplink receiving power of each of the m wave beams, wherein n is a positive integer and is less than m; and sending an pilot signal to the UE according to the n wave beams. In the embodiment of the invention, the uplink receiving power of each of the m wave beams is determined according to the uplink detection signal of the user equipment (UE), and n wave beams are selected from the m wave beams to send pilot signal to the UE according to the uplink receiving power of each of the m wave beams, not sending the pilot signal to the UE through all wave beams, thereby improving the flexibility of pilot signal configuration for the UE, and reducing the complexity of the measurement of the pilot signal through the UE.
Owner:HUAWEI TECH CO LTD
Electrochemical bio-sensing test paper, biosensor device and analyte measuring system
InactiveCN102128932AEasy to useReduced measurement timeBiological testingMaterial electrochemical variablesReaction layerAnalyte
The invention discloses analyte measuring electrochemical bio-sensing test paper with a blood volume ratio correcting function, a biosensor device, a system and a method. The test paper comprises a first group of electrodes for detecting the concentration of an analyte and a second group of electrodes for detecting a blood volume ratio concentration, wherein the first group of electrodes and the second group of electrodes correspond to different reaction regions respectively; a reaction layer reacting with a substance to be measured is only covered on the first group of electrodes; and first signals including a direct current signal are supplied to the first group of electrodes and second signals including a fixed-frequency alternating current signal are supplied to the second group of electrodes, so that an analyte concentration and a blood volume ratio which are not corrected are further measured respectively and a more accurate analyte concentration corrected by a blood volume ratio is obtained.
Owner:TAIDOC TECH CORP
Channel state information reference resource configuration method and determination method, base station and terminal
The invention provides a channel state information reference resource configuration method. The channel state information reference resources configuration method comprises the following steps that: a base station configures channel state information reference resources corresponding to a channel state information (CSI) measurement process for a terminal through terminal dedicated high-level signaling; and the channel state information (CSI) measurement process is one of a CSI process, a combination of the CSI process and a sub frame cluster, and a combination of the CSI process and a CSI report. The invention further provides a channel state information reference resource determination method. According to a method for the base station to aperiodically trigger terminal feedback, when the base station aperiodically triggers the terminal feedback, the minimum interval of two times of aperiodic triggering is N millisecond. According to a method for the terminal to aperiodically trigger feedback, when the terminal aperiodically triggers the feedback, the minimum interval of two times of aperiodic feedback triggering execution is N millisecond. The invention also provides a base station and a terminal.
Owner:ZTE CORP
Six-free-degree displacement measurement method of exposure zone on wafer stage
ActiveCN105045042AAccurate six degrees of freedom displacementReduce measurement complexityUsing optical meansPhotomechanical exposure apparatusCoil arrayGrating
A six-free-degree displacement measurement method of an exposure zone on a wafer stage is applied in six-free-degree displacement measurement of the exposure zone on the wafer stage. The wafer stage comprises a coil array and a movement bench. A planar optical grating is fixed below a magnetic steel array of the movement bench, so that a reading head is fixed in the gap of the coil array, wherein a central line of the reading head is coincided with a central line of a lens. A measurement zone is formed by an incident measurement light beam from the reading head on the planar optical grating, wherein the centers of the measurement zone and the exposure zone are positioned at the same vertical line. One part, which is covered by the exposure zone, of the movement bench is approximately considered as a rigid body, when the movement bench is deformed due to movement or vibration, the six-free-degree displacement of the exposure zone is obtained by means of calculation of the six-free-degree displacement, which is measured by the reading head, of the measurement zone, thereby achieving six-free-degree displacement measurement of the exposure zone at any time during movement of the wafer stage. The method can reduce measurement complexity and increase measurement precision, and especially can accurately measure the six-free-degree displacement of the exposure zone at any time even the movement bench his high in flexibility.
Owner:TSINGHUA UNIV +1
Parameter display method and device for electrocardiograms, and terminal equipment and medium
InactiveCN110200623AEasy to moveAutomate calculationDiagnostic recording/measuringSensorsTerminal equipmentSimulation
The invention is suitable for the technical field of medical signal processing, and provides a parameter display method and device for electrocardiograms, and terminal equipment and a medium. The method includes loading at least one pair of measuring lines in an electrocardiogram display interface; receiving a sliding event in the electrocardiogram display interface, and detecting the real-time position of a touch point in the sliding event; moving the measuring lines in the electrocardiogram display interface according to the real-time position of the touch point; and displaying the electrocardiogram parameter value of an electrocardiogram waveform based on the intersection point of the measuring lines and the electrocardiogram waveform during the moving of the measuring lines in real time. In the embodiments, users can accurately select two position points on the electrocardiogram waveform which needs to be measured, so that the measuring accuracy rates of electrocardiogram parameters can be enhanced; and the users can visually read the electrocardiogram parameter values displayed on the electrocardiogram display interface in real time, so that the electrocardiogram parameter values displayed by the electrocardiogram display interface can also be changed in real time as long as the users change touch positions, and thus, measuring efficiency can be enhanced.
Owner:EDAN INSTR
Method and system for dynamically optimizing client queries to read-mostly servers
ActiveUS20160162544A1Reduce measurement complexityDigital data information retrievalDigital data processing detailsQuery optimizationResult set
A system and method of query optimization are disclosed. A complexity measure of a client query received from a client application is compared to a predetermined threshold, which is determined using at least one of system data and query execution data. An optimized query is generated by modifying the client query to reduce the complexity measure of the client query if the complexity measure of the client query exceeds the predetermined threshold. The optimized query is submitted to a server application on a server and a post-processing routine to be applied to the result set is selected.
Owner:DELL PROD LP
Flow metering device and metering method, and measurement and control integrated gate system
ActiveCN108775936AHigh precisionOptimize layoutBarrages/weirsVolume/mass flow measurementSonarUltrasonic sensor
The invention relates to a flow metering device and metering method, and a measurement and control integrated gate system. The device includes a liquid measuring box, an ultrasonic transducer and sonar; the ultrasonic transducer and the sonar are arranged on the liquid measuring box; the ultrasonic transducer is used for obtaining the flow velocity of a liquid; the sonar is used for obtaining thesectional area of liquid flow and flow revision coefficients; and the liquid flow can be obtained according to the flow velocity of the liquid, the sectional area of the liquid flow and the flow revision coefficients. The device can optimize the layout of the ultrasonic transducer, increase sonar measurement sectional areas and the flow revision coefficients, and perform correction on measuring results of the ultrasonic transducer on the basis of conventional measurement and control integrated gate water measuring tanks, and therefore, the precision of flow metering can be significantly enhanced, and the precision can reach up to 99%; and the system can mitigate the work intensity of water distributors and reduce water distribution disputes, and therefore, water distribution management level can be enhanced, water resources in irrigation areas can be fully utilized, and irrigation benefits in the irrigation areas can be increased.
Owner:中国航天系统科学与工程研究院
Channel measurement method and communication device
ActiveCN112054824AReduce measurement complexityGuaranteed Feedback AccuracyPolarisation/directional diversitySignal allocationPrecodingTime delays
The invention provides a channel measurement method and a communication device. The method comprises: a terminal device generates and sends first indication information to a network device, the firstindication information being determined based on received precoding reference signals of P ports so as to indicate Q ports in the P ports; the P ports correspond to P angle time delay pairs, each angle time delay pair comprises an angle vector and a time delay vector, and the pre-coding reference signal of each port in the P ports is obtained by pre-coding the reference signal based on one angle vector and one time delay vector; the Q ports correspond to Q angle time delay pairs in the P angle time delay pairs. The reference signal is pre-coded through the time delay vector, the change of thechannel in the frequency domain can be represented through the linear superposition of a plurality of time delay vectors, and the terminal equipment only needs to feed back the selected time delay vector to the network equipment, and does not need to feed back independently based on each frequency domain unit, so that the feedback overhead can be reduced.
Owner:HUAWEI TECH CO LTD
Method for testing binding power between multi-wall nanotubes
ActiveCN105092794AImprove accuracyHigh precisionMaterial analysisInteraction energyMulti-Walled Nanotube
The invention provides a method for testing binding power between multi-wall nanotubes in order to accurately test the binding power between the two multi-wall nanotubes when the nanotubes are located at the complex positions in space. The method includes the following steps that relative coordinates and absolute coordinates between corresponding points on the two multi-wall nanotubes in different coordinate systems are determined according to the geometric distribution condition of the two multi-wall nanotubes in space; the cohesive energy relational expression between the two multi-wall nanotubes can be calculated according to the Van Der Waals interaction between the two multi-wall nanotubes, and integration is conducted so that the total cohesive energy expression between the two multi-wall nanotubes can be obtained; derivation treatment is carried out on the total cohesive energy expression, so that the expression of the binding power between the two multi-wall nanotubes is obtained; the magnitude of the binding power between the two multi-wall nanotubes is calculated through a binding power formula by means of the given multi-wall nanotube radii and the perpendicular distance and the cross angle between the tubes. The method has the advantages that cost is low and the operation procedure is simple and convenient. Testing complexity is effectively lowered, and meanwhile high accuracy and precision are achieved. The method is suitable for application and popularization.
Owner:JIANGNAN UNIV
Length measurement method and terminal
InactiveCN107436134AImprove the speed of measuring lengthReduce measurement errorUsing optical meansLight beamLength measurement
The embodiment of the invention discloses a length measurement method and a terminal. The method comprises: when the measurement function of a terminal is started and the terminal is located at a first position, the terminal starts a light beam emission instruction; the terminal emits a first light beam according to the light beam emission instruction, and the first light beam and a first plane form an emission included angle; when the first light beam is emitted, the terminal obtains first operation, and the first operation is configured to indicate the terminal to rotate taking a first edge as an axis; when the terminal is rotated from the first operation to a second position based on the first operation, the terminal obtains a rotation angle, and the second position is a position of the first edge of the terminal being overlapped with the first end of an object to be measured and the first light beam reaching the second end of the object to be measured; and the terminal calculates the length of the object to be measured according to the preset angle of the emission included angle, a preset distance and the rotation angle, the length of the object to be measured is a distance from the first end to the second end, and the preset distance is a distance from an arrangement point of a light emission unit on the first plane to the first edge.
Owner:XIAN ZHONGXING NEW SOFTWARE
Ultrasonic probe bandwidth detection method and system based on lens echoes
ActiveCN111812622ASound wave propagation distance is shortEliminate Measurement ConstraintsWave based measurement systemsInfrasonic diagnosticsFrequency spectrumEngineering
The invention discloses an ultrasonic probe bandwidth detection method and system based on lens echo. The method comprises steps of S11, obtaining a narrow pulse waveform generated by a pulse emitter,and storing the narrow pulse waveform; S12, taking the narrow pulse waveform as a transmitted waveform, acquiring a channel signal corresponding to an ultrasonic probe surface lens echo acquired by an oscilloscope, and storing the channel signal; and S13, respectively calculating the frequency spectrums of the narrow pulse waveform and the channel signal, and calculating the pulse response frequency spectrum of the ultrasonic probe according to the calculated frequency spectrums of the narrow pulse waveform and the channel signal to obtain the bandwidth of the ultrasonic probe. The method isadvantaged in that lens echoes generated by mismatching of the probe lens and the air acoustic impedance are used for detecting the bandwidth of the ultrasonic probe, precision of bandwidth measurement of the ultrasonic probe is improved, and complexity of bandwidth measurement of the ultrasonic probe is reduced.
Owner:聚融医疗科技(杭州)有限公司
Measurement method and device for positioning, and storage medium
PendingCN114071500AReduce measurement complexityReduce positioning delayPosition fixationPilot signal allocationReal-time computingBase station
Embodiments of the invention provide a measurement method and device for positioning, and a storage medium. The method comprises the following steps: receiving resource configuration information and measurement constraint information sent by a positioning server, wherein the measurement constraint information is used for indicating how target equipment uses the resource corresponding to the resource configuration information for measurement; and performing resource measurement based on the resource configuration information and the measurement constraint information, and sending a measurement result to the positioning server. According to the embodiments of the application, the measurement constraint information is added to perform positioning measurement limitation, so UE or the base station only measures a reference signal in an effective direction, the measurement complexity of the UE and the base station is reduced, and positioning time delay is also reduced.
Owner:DATANG MOBILE COMM EQUIP CO LTD
Signal measurement method and device, and computer readable storage medium
PendingCN110536313AReduce measurement complexityReduced measurement power consumptionPower managementHigh level techniquesEngineeringUser equipment
Disclosed are a signal measurement method and a device, and a computer readable storage medium, the method comprises: a network side configures a measurement period of a user equipment (UE) for measuring a reference signal (RS) in an activated state and an energy-saving state, or configures a transmission period of the measurement RS in the activated state and the energy-saving state of the UE; the network side configures a transmission window for measuring RS; and the network side sends the configured measurement period or sending period and the transmission window to the UE, sends a wake-upsignal wake up signal to the UE, and sends a measurement RS to the UE according to the sending period and / or the transmission window. The method can reduce the UE measurement complexity, reduce the UEmeasurement power consumption, reduce the power consumption of the base station side, and reduce the resource overhead.
Owner:ZTE CORP
Network interface message, method and system for wireless localization of localization multiple base stations united arrive angle
ActiveCN101437286AImprove positioning efficiencyReduce measurement complexityRadio transmission for post communicationWireless communicationRadio Network ControllerMobile phone
The invention discloses a network interface message and a method and a system for multi-base station and arrival angle combined wireless positioning. The method enables the system to acquire signal arrival angles of a mobile phone signal relative to serving base stations and auxiliary base stations at the same time and acquire estimation of the position of the mobile phone. The invention adopts a technical proposal that the method comprises the following steps: a core network sends a positioning request; a serving radio network controller sends a signal arrival angle measurement request; the serving stations measure the signal arrival angels; the serving base stations report signal arrival angle measurement; the serving radio network controller sends signal arrival angle measurement request to at least one auxiliary base station in a format of a network interface information, wherein the network interface information comprises a measurement indicator, measurement type information and measurement signal configuration information which indicates configuration conditions of the uplink signals of the mobile phone; the auxiliary base stations measure the arrival angles; the auxiliary base stations report the signal arrival angle measurement; the serving radio network controller carries out position calculation; and the serving radio network controller reports the results of the position calculation of the mobile phone. The invention is applied in the field of wireless communication.
Owner:SPREADTRUM COMM (SHANGHAI) CO LTD
Method for measuring three-dimensional angular motion by adopting optical flow
The invention discloses a method for measuring three-dimensional angular motion by adopting optical flow. Three or more than three optical flow sensors with non-coplanar directions are used for strapdown connection with a measured object, and a plurality of continuous two-dimensional image streams in an imaging range are obtained; corresponding optical flow measurement values are calculated according to the obtained two-dimensional image flow and the principle of similar triangles and multiplied by set coefficients to obtain corresponding angular increment proportional expressions on the x axis, the y axis and the z axis, and then the angular increment proportional expressions are converted into products of constant coefficient matrixes and optical flow measurement value matrixes to obtaincorresponding three-dimensional angular increments, and thus the measurement complexity is reduced.
Owner:GUILIN UNIV OF ELECTRONIC TECH
Automatic air volume measuring device
PendingCN114791510AEasy to carryEasy to adjustFluid speed measurement using thermal variablesSpeed/acceleration/shock instrument detailsAir volumeHotline
An automatic air volume measuring device disclosed by the present invention comprises a measurement angle adjusting structure, a configuration height adjusting structure and an air volume sensor, the measurement angle adjusting structure is used for driving the configuration height adjusting structure to perform full circumferential rotation, and the configuration height adjusting structure comprises a derivation driving module and a built-in carrying block. An air volume sensor is arranged on the built-in carrying block, and the pushing and guiding driving module comprises a carrying positioning block, an extending assembling rod, a built-in guiding frame, a second motor, a driving bevel gear, a driven bevel gear, a linkage shaft, a pushing and guiding fork and a lifting connecting rod. Through the cooperation of the measurement angle adjusting structure and the matching height adjusting structure, the device is convenient to carry a standard hot-wire anemometer main body and a matched wind speed measurement structure, is convenient to adjust the angle and height of the air volume to be measured, reduces the measurement complexity, improves the convenience, is small in size, is high in stability, and is convenient to use. And the device is particularly suitable for being mounted on the existing columnar structures such as telegraph poles or fan tower poles and the like.
Owner:HUNAN INST OF METROLOGY & TEST
Measuring method and device
ActiveCN107733540AReduce Feedback OverheadReduce measurement complexitySite diversityTransmission monitoringReal-time computingChannel state information
The invention discloses a measuring method and device. According to the method and the device, the feedback overhead is saved, and meanwhile, a measurement result meets the demand of CoMP. The measuring method comprises the following steps that a first network device sends a restricted channel state information (CSI) measurement instruction to a second network device, wherein the restricted CSI measurement instruction is used for indicating the second network device to perform restricted CSI measurement; and the first network device receives CSI sent by the second network device, wherein the CSI is generated after the CSI measurement is completed according to the CSI measurement instruction.
Owner:HUAWEI TECH CO LTD
A method for measuring the bonding force between multi-walled nanotubes
ActiveCN105092794BImprove accuracyHigh precisionMaterial analysisInteraction energyMulti-Walled Nanotube
The invention provides a method for testing binding power between multi-wall nanotubes in order to accurately test the binding power between the two multi-wall nanotubes when the nanotubes are located at the complex positions in space. The method includes the following steps that relative coordinates and absolute coordinates between corresponding points on the two multi-wall nanotubes in different coordinate systems are determined according to the geometric distribution condition of the two multi-wall nanotubes in space; the cohesive energy relational expression between the two multi-wall nanotubes can be calculated according to the Van Der Waals interaction between the two multi-wall nanotubes, and integration is conducted so that the total cohesive energy expression between the two multi-wall nanotubes can be obtained; derivation treatment is carried out on the total cohesive energy expression, so that the expression of the binding power between the two multi-wall nanotubes is obtained; the magnitude of the binding power between the two multi-wall nanotubes is calculated through a binding power formula by means of the given multi-wall nanotube radii and the perpendicular distance and the cross angle between the tubes. The method has the advantages that cost is low and the operation procedure is simple and convenient. Testing complexity is effectively lowered, and meanwhile high accuracy and precision are achieved. The method is suitable for application and popularization.
Owner:JIANGNAN UNIV
Pressure signal-based dynamic model speed history testing method and system
ActiveCN110146718AImprove measurement efficiencyReduce measurement complexityDevices using fluidsTime changesDynamic models
The invention discloses a pressure signal-based dynamic model speed history testing method and system, which relate to the technical field of dynamic model speed measurement. The method comprises steps: the geometric model of an actual train is reduced to a train model according to a predetermined proportion; a data acquisition system is mounted on the train model, the data acquisition system comprises at least one pressure sensor, when the train model runs, the pressure value of the train model is measured by the pressure sensor mounted on the train model, and according to the change relationship of pressure along with time, a pressure-time change curve is obtained; and after the pressure-time change curve is measured and obtained, the real-time running speed of the train model is calculated. The pressure-time change curve on the train model surface is measured by using the pressure sensor, the real-time running speed of the train model in the entire running process can be calculatedthrough the measured pressure-time change curve, the train model speed history measurement efficiency can be effectively improved, and the measurement complexity is reduced.
Owner:INST OF MECHANICS - CHINESE ACAD OF SCI
Direction-of-arrival measurement device and method based on large-scale antenna array
InactiveCN110412502AReduce measurement complexityReduce the number of antennasDirection findersMeasurement deviceEngineering
The invention discloses a direction-of-arrival measurement device and method based on a large-scale antenna array. The direction-of-arrival measurement device comprises a first receiving antenna, a second receiving antenna, a third receiving antenna and a fourth receiving antenna, wherein the first receiving antenna and the second receiving antenna are spaced transversely, the third receiving antenna and the fourth receiving antenna are spaced longitudinally, and the first receiving antenna, the second receiving antenna, the third receiving antenna and the fourth receiving antenna are installed on a guide rail movement device through a connecting device; the first receiving antenna and the second receiving antenna are both connected with the same first phase detection module, the third receiving antenna and the fourth receiving antenna are connected with the same second phase detection module, and a single-chip microcomputer is connected to the output ends of the first phase detectionmodule and the second phase detection module; a guide rail control unit and an upper computer are further connected to the single-chip microcomputer separately. According to the direction-of-arrival measurement device and method, the large-scale antenna array is simulated through a small number of antennas, and the antenna cost and computation complexity are lowered.
Owner:XIAN UNIV OF SCI & TECH
A method for arranging reference holes
ActiveCN110530326BHigh precisionAccuracy requirements metMeasurement devicesAircraft assemblyMeasuring instrumentEngineering
The steps of the method for arranging reference holes disclosed by the invention are as follows: S1 uses a measuring instrument to measure the deformation of assembled segmented parts, and S2 divides the reference holes into two categories: 1) The reference holes for measuring the assembly position of the parts are used for feedback The actual assembly position of the part; 2) The reference hole for part deformation measurement is used to feed back the deformation of the part; S3 arranges the reference holes on the part according to the error assigned to the hole position correction link: when the measured maximum deformation of the part is , the hole position error assigned to the hole position correction link through the tolerance is , then when the deformation of the part is small and satisfied, only the reference holes are arranged at both ends of the part; when it is satisfied, the reference holes are arranged at both ends of the part, and at Datum holes for measuring part deformation are arranged between the datum holes at both ends. The beneficial effect of the patent of the present invention is that it can accurately reflect the actual assembly situation of the parts to the automatic hole-making system, improve the accuracy of the hole-making holes, ensure that the corrected hole-making holes meet the accuracy requirements, and effectively reduce the number of reference holes. Reduce the complexity of reference hole measurement and improve production efficiency.
Owner:CHENGDU AIRCRAFT INDUSTRY GROUP
Network interface message, method and system for wireless localization of localization multiple base stations united arrive angle
ActiveCN101437286BImprove positioning efficiencyReduce measurement complexityRadio transmission for post communicationWireless communicationRadio Network ControllerMobile phone
The invention discloses a network interface message and a method and a system for multi-base station and arrival angle combined wireless positioning. The method enables the system to acquire signal arrival angles of a mobile phone signal relative to serving base stations and auxiliary base stations at the same time and acquire estimation of the position of the mobile phone. The invention adopts atechnical proposal that the method comprises the following steps: a core network sends a positioning request; a serving radio network controller sends a signal arrival angle measurement request; the serving stations measure the signal arrival angels; the serving base stations report signal arrival angle measurement; the serving radio network controller sends signal arrival angle measurement request to at least one auxiliary base station in a format of a network interface information, wherein the network interface information comprises a measurement indicator, measurement type information and measurement signal configuration information which indicates configuration conditions of the uplink signals of the mobile phone; the auxiliary base stations measure the arrival angles; the auxiliary base stations report the signal arrival angle measurement; the serving radio network controller carries out position calculation; and the serving radio network controller reports the results of the position calculation of the mobile phone. The invention is applied in the field of wireless communication.
Owner:SPREADTRUM COMM (SHANGHAI) CO LTD
A Method for Measuring Three-Dimensional Angular Motion Using Optical Flow
The invention discloses a method for measuring three-dimensional angular motion by using optical flow. Three or more optical flow sensors pointing to different planes are strapped down to the measured object to obtain multiple continuous two-dimensional image flows within the imaging range. , according to the obtained two-dimensional image flow, calculate the corresponding optical flow measurement value according to the similar triangle principle, and multiply it with the set coefficient to obtain the corresponding angular increment on the x-axis, y-axis and z-axis The proportional formula is then converted into the product of the constant coefficient matrix and the optical flow measurement value matrix to obtain the corresponding three-dimensional angle increment, which reduces the measurement complexity.
Owner:GUILIN UNIV OF ELECTRONIC TECH
Flow metering device, metering method, and gate system with integrated metering and control
ActiveCN108775936BHigh precisionOptimize layoutBarrages/weirsVolume/mass flow measurementSonarMeasurement device
Owner:中国航天系统科学与工程研究院
A Three-phase Power Grid Impedance Measurement Method Using Composite Orthogonal Pulse Injection in Frequency Division
ActiveCN109828154BAccurate Impedance ResultsReduce harmonic contentImpedence measurementsGrid impedanceLow frequency band
The invention provides a method for measuring the impedance of a three-phase power grid by frequency-divided composite orthogonal pulse injection, which belongs to the technical field of power generation systems. The method includes the following steps: (1) Determine the grid impedance measurement bandwidth according to the design parameters of the three-phase inverter; (2) Divide the measurement frequency range into low frequency band, middle frequency band and high frequency band; Design an orthogonal pulse sequence, and superimpose the designed pulses on the given d and q axis currents of the three-phase inverter; (4) Sampling the voltage and current of the PCC point during the pulse injection period of each frequency band and using FFT to convert to frequency domain, and calculate the positive and negative sequence grid impedance; (5) combine the results obtained in step (4) by frequency to obtain the three-phase grid impedance measurement results in a wide frequency range. The invention can realize high-precision measurement of grid impedance in a wider frequency range with fewer measurement times, reduce the harmonic content of grid-connected current during pulse injection, and improve power quality.
Owner:NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
A torque control method for switched reluctance motor based on low-cost position sensor
ActiveCN108429504BLow costReduce measurement complexityElectronic commutation motor controlVector control systemsOvervoltageElectric machinery
The invention discloses a low-cost position sensor-based switched reluctance motor torque control method. According to the method, the rotor speed and position information of a switched reluctance motor are estimated through the signals of a low-cost position sensor; flux linkage characteristic curves at special rotor positions are dynamically obtained through voltages, current and position signals; and therefore, and complete flux linkage characteristics can be obtained through analytical calculation; and torque characteristics are obtained through the complete flux linkage characteristics, so that direct instantaneous torque control can be carried out. With the control method adopted, torque ripples can be reduced, system cost can be effectively reduced, characteristic measurement time can be shortened, and measurement complexity can be reduced.
Owner:NORTHWESTERN POLYTECHNICAL UNIV
Method and system for testing velocity history of dynamic model based on pressure signal
ActiveCN110146718BImprove measurement efficiencyReduce measurement complexityDevices using fluidsDynamic modelsClassical mechanics
The invention discloses a pressure signal-based dynamic model speed history testing method and system, which relate to the technical field of dynamic model speed measurement. The method comprises steps: the geometric model of an actual train is reduced to a train model according to a predetermined proportion; a data acquisition system is mounted on the train model, the data acquisition system comprises at least one pressure sensor, when the train model runs, the pressure value of the train model is measured by the pressure sensor mounted on the train model, and according to the change relationship of pressure along with time, a pressure-time change curve is obtained; and after the pressure-time change curve is measured and obtained, the real-time running speed of the train model is calculated. The pressure-time change curve on the train model surface is measured by using the pressure sensor, the real-time running speed of the train model in the entire running process can be calculatedthrough the measured pressure-time change curve, the train model speed history measurement efficiency can be effectively improved, and the measurement complexity is reduced.
Owner:INST OF MECHANICS - CHINESE ACAD OF SCI
Totally-enclosed calibratable magnetic ring impedance measurement clamp and magnetic ring impedance measurement method
PendingCN112798863AEasy CalibrationFirmly connectedResistance/reactance/impedenceMeasurement instrument housingMetallic enclosureParasitic capacitance
The invention provides a totally-enclosed calibratable magnetic ring impedance measurement clamp. The magnetic ring impedance measurement clamp comprises a metal shell, and insulating support pieces and a metal coaxial core wire which are positioned in the metal shell, and the whole clamp is of a coaxial structure; the metal shell is divided into a part A shell and a part B shell; the two ends of the metal shell are respectively provided with an electrical connector; the insulating support pieces are correspondingly divided into a first insulating support piece and a second insulating support piece which are respectively and fixedly arranged in the part A shell and the part B shell, and a space for mounting a to-be-tested magnetic ring is reserved at a position close to the butt joint position of the shell; and the metal coaxial core wire penetrates through the first insulating supporting piece and the second insulating supporting piece and is correspondingly connected with the electrical connectors arranged at the two ends of the metal shell. According to the invention, a totally-enclosed coaxial structure is adopted, so that the influence of high-frequency parasitic capacitance and leakage inductance on a measurement result is avoided; and meanwhile, the coaxial structure is stably limited, so that the accuracy and the consistency of the impedance of the magnetic ring during high-frequency measurement can be improved.
Owner:NORTHWEST INST OF NUCLEAR TECH
A channel measurement method and communication device
ActiveCN112054824BReduce measurement complexityGuaranteed Feedback AccuracyPolarisation/directional diversitySignal allocationPrecodingTerminal equipment
The present application provides a channel measurement method and a communication device. The method includes: the terminal device generates and sends first indication information to the network device, the first indication information is determined based on the received precoding reference signals of P ports, and is used to indicate Q ports among the P ports; The P ports correspond to P angle delay pairs, each angle delay pair includes an angle vector and a delay vector, and the precoding reference signal of each port in the P ports is based on an angle vector and a time delay vector. The delay vector is obtained by precoding the reference signal; the Q ports correspond to the Q angle delay pairs among the P angle delay pairs. The reference signal is precoded through the delay vector, and the change of the channel in the frequency domain can be represented by the linear superposition of multiple delay vectors. The terminal device only needs to feed back the selected delay vector to the network device without having to Based on separate feedback on each frequency domain unit, feedback overhead can be reduced.
Owner:HUAWEI TECH CO LTD
System and method for monitoring and controlling temperature and optical power of optical waveguide device in situ
ActiveCN113639795AImprove accuracyReduce measurement complexityMeasurement devicesTemperatue controlOptical powerEngineering
The invention discloses a system and a method for monitoring and controlling the temperature and the optical power of an optical waveguide device in situ. The system comprises the steps of measuring the admittance variation of an optical waveguide at different frequencies through CLIPP, and simultaneously monitoring the optical power and the temperature of an integrated optical waveguide device in situ by combining with the function relation at different test frequencies; and enabling a feedback control circuit to feed back and control the temperature and the optical power of the integrated optical waveguide device according to the admittance variation obtained by a signal reading circuit. The method comprises the following steps: selecting a plurality of driving frequencies, and respectively fitting a binary function relationship among temperature, optical power and admittance variation; reading the admittance variation of the CLIPP under the driving frequencies, and reversely deducing the temperature and the optical power of the integrated optical waveguide device; using the temperature and the optical power, obtained by the signal reading circuit, of the integrated optical waveguide device, enabling a PID regulator to feed back and adjust the current provided for the TEC by the temperature controller and the output optical power of a laser, and adjusting the temperature and the optical power of the integrated optical waveguide device to set values.
Owner:TIANJIN UNIV
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