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98results about How to "Offset interference" patented technology
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Uplink multipoint collaboration implementing method combining inter-cell interference coordination
InactiveCN101483873ASimplify the division processGuaranteed CompatibilitySite diversityNetwork planningNonlinear methodsClassification methods
The invention relates to a realization method for the uplink multipoint cooperation (CoMP) combining with inter-cell interference coordination (ICIC), which comprises the following steps: 1) a site measures the SINR of the user to judge whether the user is a marginal user or a central user and distributes the working frequency band of the user based on ICIC frequency band classification method; 2) the user sends data to the cell according to the distributed working frequency band; 3) the site judges whether the site or the business of the user supports CoMP; if CoMP is not supported, the data is extracted by a linear or nonlinear method; if CoMP is supported, step 4) is followed; 4) the cell receives the sent data and processes the data. The method ensures the compatibility of CoMP and ICIC proposals, which can improve the marginal throughput of the cell and the average throughput of the system.
Owner:XIDIAN UNIV
Common station address interference elimination system and method
InactiveCN101453228AOffset interferenceReduce inhibitionTransmissionWireless communicationInterference eliminationTime delays
The invention relates to a system and a method for eliminating common station site interference. The system comprises a first coupler, a transmission unit, an adjustment unit, an offset unit and a detection control unit, wherein the first coupler is used for extracting a signal transmitted by an interference base station as an interference offset signal, and coupling the interference offset signal to the transmission unit; the transmission unit is used for transmitting the interference offset signal to the adjustment unit; the adjustment unit is used for carrying out time delay, amplitude andphase adjustment of the interference offset signal to ensure that the interference offset signal and an interference signal received by a receiver from the interference base station through a wireless path have identical amplitudes and 180-degree phase difference; the offset unit is used for adding the interference offset signal adjusted by the adjustment unit to the interference signal received by the receiver from the interference base station, thereby offsetting the interference signal from the interference base station; and the detection control unit is used for controlling the adjustmentunit to carry out time delay, amplitude and phase adjustment of the interference offset signal according to the interference signal received by the receiver from the interference base station.
Owner:PANASONIC CORP
Composite electromagnetic shield materials and method for preparing same
InactiveCN101704312ALow costImprove shielding effectMagnetic/electric field screeningMetal layered productsMetal coatingAdhesive glue
The invention relates to a composite electromagnetic shield material with a laminated structure. The laminated structure comprises a magnetic material coating, a metal coating, an adhesive glue coating and a plastic protective coating, wherein one side of the metal coating is jointed with the magnetic material coating, the other side of the metal coating is jointed with one side of the adhesive glue coating, and the other side of the adhesive glue coating is jointed with the plastic protective coating. The invention has the advantages that: firstly, the theory of electromagnetic shield shows that the composition of the metal coating and the magnetic material coating can well shield high-frequency and low-frequency interference; secondly, the technology is simple, the cost is low, and the technical requirements of most electromagnetism compatibility engineering can be satisfied through adjusting the thickness of the metal coating, the thickness and magnetic permeability of soft magnetic material and other parameters; and thirdly, the shield material is easy to adhere outside or inside plastic casings of electrical appliances according to requirements of use after tearing off the plastic protective coating on the adhesive glue coating.
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA
Nano self-power-generation bionic flapping-wing air vehicle
InactiveCN106347660AHave diversityReduce weightPiezoelectric/electrostriction/magnetostriction machinesOrnithoptersFlapping wingRechargeable cell
The invention relates to a nano self-power-generation bionic flapping-wing air vehicle. The nano self-power-generation bionic flapping-wing air vehicle comprises nano self-power-generation bionic wings, a nano self-power-generation bionic tail wing, an intelligent controller, rechargeable batteries, sensors, a global positioning system, a signal receiving and transmitting device and a fuselage, wherein each of the nano self-power-generation bionic wings and the nano self-power-generation bionic tail wing comprises multi-joint driving rods; the multi-joint driving rods comprise wing arm front edge multi-joint driving rods, wing arm central pivot multi-joint driving rods and tail multi-joint driving rods; the multi-joint driving rods comprise joint drivers; each joint driver comprises a micro motor, a brake connection part and a pressure sensor module; the nano self-power-generation bionic wings, the nano self-power-generation bionic tail wing, the rechargeable batteries, the sensors, the global positioning system and the signal receiving and transmitting device are all connected with the intelligent controller. The nano self-power-generation bionic flapping-wing air vehicle has extremely important and wide application prospects in both civil and military fields.
Owner:CHINA UNIV OF GEOSCIENCES (WUHAN)
Weld joint tracking detection equipment and method
ActiveCN101927395AImplement trackingEasy to detectArc welding apparatusUsing optical meansButt jointLight spot
The invention discloses weld joint tracking detection equipment, which comprises a structured light generator for generating structured light, a beam expanding lens, a beam shaping device and an imaging device, wherein the beam expanding lens is positioned at the downstream of the structured light generator and is used for expanding beams of the structured light emitted by the structured light generator; the beam shaping device is positioned at the downstream of the beam expanding lens and is used for shaping the expanded beams to form surface structured light with preset shapes, so that light spots of preset shapes are formed on the weld joints; and the imaging device is used for imaging the light spots of the preset shapes on the weld joints. In the weld joint tracking detection equipment, the butt-jointed weld joints are detected and tracked by adopting the light spots imaged by the surface structured light, and narrow weld joints of which the width is less than 1 millimeter can betracked. The invention also provides a weld joint tracking detection method, which adopts the weld joint tracking detection equipment.
Owner:TSINGHUA UNIV
Method and device for notifying and receiving downlink demodulation reference signal initialization configuration parameters
InactiveCN103326758AImprove accuracyAddressed issues with limited split buffsSpatial transmit diversityNetwork data managementRandomizationComputer science
The invention discloses a method and device for notifying and receiving downlink demodulation reference signal initialization configuration parameters. The notifying method is applied to a base station. The downlink demodulation reference signal initialization configuration parameters comprise identifications (IDs) and / or scramble identifications. The notifying method comprises two steps, wherein the first step is that the base station configures N IDs for a terminal according to a high-level signaling exclusive to a user; the second step is that the base station judges whether more than two of the N IDs are identical, and decides to determine the initialization value of a downlink DMRS sequence in one of the following modes according to the judging result; the scramble identification nSCID and the ID used for determining the initialization value of the downlink DMRS sequence are sent to the terminal. By means of the method and device for notifying and receiving the downlink demodulation reference signal initialization configuration parameters, the switchover between dynamic orthogonality and interference randomization of the interference of one UE to other UE can be realized, and therefore the effects of offsetting the interference of users, improving the accuracy of data acceptance and enabling cells to split and gain under the Scenario 4 are achieved.
Owner:ZTE CORP
Crack detection method based on laser scanning thermal imaging
ActiveCN107389732AOffset interferenceImproving the signal-to-noise ratio of crack imagingMaterial flaws investigationSignal-to-noise ratio (imaging)Thermodynamics
The invention discloses a crack detection method based on laser scanning thermal imaging. The method comprises the following steps: scanning a heated sample surface by relative movement of the line laser and the sample; adopting a thermal imager for recording the condition of temperature change of the sample surface in real time; adopting a computer for acquiring the heat signals on all the points of the sample surface according to the temperature distributions at different moments in a thermal image, aligning the time axis of the heat signals and cutting and then adopting an adjacent heat signal comparing method for imaging the cracks. According to the invention, the signal-to-noise ratio of the crack detection can be effectively promoted and tiny cracks on the detected piece surface can be detected.
Owner:CHINA JILIANG UNIV
Single-carrier frequency domain equalization realization method and system
InactiveCN104618282AOffset interferenceReduce computationTransmitter/receiver shaping networksFast Fourier transformCarrier signal
The invention discloses a single-carrier frequency domain equalization realization method and a single-carrier frequency domain equalization realization system. Date frames employed in each step respectively comprise a training sequence part and a data transmission part; the data transmission part is behind the training sequence part and composed of an UW (Ultrasonic Wave) and a data block, and the UW is prior to the data block; the data block comprises multiple continuous FFT (Fast Fourier Transform Algorithm) blocks, any one of FFT blocks is respectively composed of one data and one UW, and the data is prior to the UW; the training sequence part is prior to the data transmission part and composed of the UW and a long PN (Performance number) sequence for frame synchronization detection and channel estimation, the long PN sequence is composed of the integral multiple of the UW, and the length of the long PN sequence is the same as the length of one data in the data block. According to the method and the system, the number of operation is reduced when the high precision is ensured.
Owner:CHINA MERCHANTS CHONGQING COMM RES & DESIGN INST
Balance bicycle steering control method and balance bicycle
InactiveCN106184520AImprove operational reliabilityAchieve steering controlMotorised scootersSteering deviceFoot solesEngineering
The invention discloses a balance car steering control method and a balance car. The balance car includes a car body, and a pedal assembly arranged on the car body, and the pedal assembly includes pressure sensors corresponding to the bipods respectively; The foot pressure difference and the driver's weight; control the steering of the balance car according to the ratio of the pressure difference between the feet and the weight. The invention can realize precise steering without a rotating shaft.
Owner:尚艳燕
Up-conversion device of vector signals based on photoelectric oscillator
ActiveCN107340666AAvoid interferenceOffset interferenceLight demodulationCarrier signalOptical fiber coupler
The invention discloses an up-conversion device of vector signals based on a photoelectric oscillator The device comprises a laser device, a first photoelectric modulator, a first optical fiber coupler, a first optical fiber, a first filter, a first photoelectric detector, a second filter, an optical crossover wavelength division multiplexer, a second photoelectric modulator, a second optical fiber coupler, a second optical fiber and a second photoelectric detector. In comparison with a traditional microwave photon up-conversion system, the device has the advantages that baseband signals do not need to be modulated onto microwave signals and frequency-conversion modulation of the baseband signals are directly conducted on optical carrier waves, so operations are more convenient; and positive and negative first-order sideband beat frequencies of the same channel of optical signals can be used to conduct up-conversion of two folds of a local frequency, most noise disturbance is offset, and a signal to noise ratio is increased.
Owner:ZHEJIANG UNIV
Three terminal type magnetic flow gate sensor
InactiveCN1904629ASimple structureEasy to processMagnetic field measurement using flux-gate principleTemperature coefficientPermalloy
The invention relates to a three-terminal flux gate sensor that is made up of coiling a set of winding on two I shaped frames, and one starting end of the winding is connected to the terminal end of the other winding to form center end to used as the measuring end and feedback end of the sensor. The two other ends of the winding are used as the prompting end. The three terminals are sintered on PCB, and the two I shaped frame winding are cementing to form II shaped frame winding. Coiling 2-4 circles of permalloy to the center of two I shaped frames to make raceway magnetic core, and packaging the II shaped frame magnetic winding and PCB into non magnetic aluminum box. The invention has simple structure, and easy to manufactured. It could counteract the influence of distributed capacitance, interference signal and temperature drifting. The accuracy and resolution of the sensor are improved. And the power consumption and temperature coefficient would be decreased.
Owner:SHANGHAI MARITIME UNIVERSITY
Synchronization frame encoding and decoding method and device
InactiveCN101170400AOffset interferenceImprove reliabilityTime-division multiplexSynchronisation signal speed/phase controlDecoding methodsSynchronous frame
The invention discloses a synchronous frame encoding method, which comprises the following steps: A, a synchronization sequence and an index number of a synchronous frame are generated; B, a check bit is formed in accordance with the generated synchronization sequence and the index number; C, the synchronous frame including the check bit is assembled in accordance with the synchronization sequence, the index number and the check bit and is then transmitted. The invention also discloses a synchronous frame decoding method, a synchronous frame encoder and a synchronous frame decoder. The inventive proposal is able to make the synchronization sequence and the index number of the synchronous frame process certain error correction capability, thereby effectively offsetting the various interference in the wireless communication channel; the invention is able to make the receiver check the error to the synchronous frame, thereby greatly improving the reliability and effectiveness of the communication.
Owner:HUAWEI TECH CO LTD
Uplink transmission method, station, communication system, and management real object
ActiveCN105450330AImprove the probability of correct receptionOffset interferenceError preventionCommunications systemUplink transmission
The invention provides an uplink transmission method, a station, a communication system, and a management real object. The method comprises a step that a station STA generates an uplink frame which comprises RUT (robust uplink transmission) indication information. When the value of the RUT indication information is a first value, it indicates that an associated access point A-AP associated with the station STA and a coordinative access point C-AP in coordinative relation with the associated access point A-AP receive the uplink frame and carry out the RUT processing of the uplink frame; when the value of the RUT indication information is a second value, it just indicates that the associated access point A-AP associated with the station STA receives the uplink frame and carries out the non-RUT processing of the uplink frame. The method also comprises a step that the station STA transmits the uplink frame.
Owner:HUAWEI TECH CO LTD
Earphone capable of automatically adjusting volume and method for automatically adjusting volume of earphone
InactiveCN105657595AGuaranteed listening experienceOffset interferenceHearing device active noise cancellationEarpiece/earphone noise reductionLoudspeakerLow-pitched
The invention provides an earphone capable of automatically adjusting volume and a method for automatically adjusting the volume of the earphone and belongs to the field of earphones. The earphone capable of automatically adjusting the volume comprises an automatic volume adjusting module and a wireless module, wherein the wireless module is connected with audio equipment, and the automatic volume adjusting module is used for automatically acquiring an external noise signal and controlling a loudspeaker of the earphone to change the volume in real time. The method for automatically adjusting the volume of the earphone has the advantages that different voice registers are set, voice register matching is carried out on the external noise signal, the external noise signal is compared with a high pitch threshold and a low pitch threshold of the external noise signal in the range of the voice register, automatic increase and decrease of the volume of the loudspeaker are realized, control is accurate, user experience is better, and popularization is facilitated.
Owner:SHENZHEN SHUYUAN TECH CO LTD
GFDM/CDMA hybrid multiple access wireless access method
InactiveCN108900459AIncreased probability of correct distinctionImprove access efficiency and system capacityCode division multiplexMulti-frequency code systemsCarrier signalCode division multiple access
The invention discloses a GFDM / CDMA hybrid multiple access wireless access method so that the interference between sub carriers of the GFDM can be eliminated. The method is characterized in that a spread slotted ALOHA is introduced in a generalized frequency division multiplexing (GFDM) / code division multiple access (CDMA) hybrid multiple-access wireless access system of a multi-carrier transmitter, so that a problem that the interference is caused between users using adjacent sub carriers is solved. After the user completes time-frequency synchronization of a base station, all users send uplink data with base station arrival times being all time slot starting times randomly; the K sub carriers are employed and each sub carrier is able to carry a GFDM system with the symbol number being Mto number the sub carriers; and when the users send data, PN sequences are added between the adjacent sub carriers to carry out spread spectrum, the same PN1 is used for sub carriers with odd numbers,and the same PN2 s used for sub carriers with even numbers, so that the interference between the non-orthogonal sub carriers is eliminated.
Owner:10TH RES INST OF CETC
Ruike and equalization cascade receiving method under the code division multiple address low band-spreading ratio and its equipment
InactiveCN1367591AHeavy calculationThe amount of calculation does not increase muchTransmission control/equalisingCode division multiplexIt equipmentChannel parameter
A receiving emthod and device of rake and equalizing cascade under the low spread spectrum ratio of code division multiple address is based on the receiving method and device of rake receiving and mutual cascade honycomb. The cascade method and divice not only can carry out consolidated receiving of effective multipass signal but also can counterbalance the interference in between symbols caused by multipath signal and especially good for high speed transmission of CDMA system under low spread spectrum ratio. It includes basically rake receiver and soft exporting equalizer for making rake receiving and estimating channel parameters of multipath fading first, and then to calculate ISI coefficient of interference in between symbols within equivalent time varying according to channel parameter and effective pass position, at least to realize equalizing calculation of soft exporting witte ratio. It is testified by computer simulation test that the high speed data transmission performacne of third generation mobile communication system can be mush improved under the condition of not to increase calculatino quantity mush.
Owner:SOUTHEAST UNIV +1
Dual-optical-path oxynitride analyzer
InactiveCN104330355AReduce distractionsFast response timeMaterial analysis by optical meansNitrogen oxidesInlet valve
The invention relates to the technical field of atmospheric monitoring and in particular relates to a dual-optical-path oxynitride analyzer. The analyzer comprises a reaction unit, an ozone generation unit, a gas inlet valve, a conversion unit, a measuring unit and a light chopping unit, wherein the reaction unit is provided with a first reaction tank and a second reaction tank, which are independent of each other; the light chopping unit comprises a chopper arranged between the reaction unit and the measuring unit. According to the dual-optical-path oxynitride analyzer, the reaction unit is provided with the two reaction tanks, gas switching is avoided, and therefore, the response time is greatly shortened, the interference of a pipeline to a gas to be tested is reduced, the measurement accuracy is improved and the service life of the analyzer is prolonged; as the light chopping unit of the dual-optical-path oxynitride analyzer is provided with the chopper which is switchable between two optical signals generated by the two reaction tanks, the arrangement of two measuring units is not required, and the interference and the fault rate due to two-path detection are avoided; meanwhile, the cost is reduced.
Owner:武汉怡特环保科技有限公司
Weld joint tracking detection equipment and method
ActiveCN101927395BImplement trackingEasy to detectArc welding apparatusUsing optical meansButt jointLight spot
The invention discloses weld joint tracking detection equipment, which comprises a structured light generator for generating structured light, a beam expanding lens, a beam shaping device and an imaging device, wherein the beam expanding lens is positioned at the downstream of the structured light generator and is used for expanding beams of the structured light emitted by the structured light generator; the beam shaping device is positioned at the downstream of the beam expanding lens and is used for shaping the expanded beams to form surface structured light with preset shapes, so that light spots of preset shapes are formed on the weld joints; and the imaging device is used for imaging the light spots of the preset shapes on the weld joints. In the weld joint tracking detection equipment, the butt-jointed weld joints are detected and tracked by adopting the light spots imaged by the surface structured light, and narrow weld joints of which the width is less than 1 millimeter can betracked. The invention also provides a weld joint tracking detection method, which adopts the weld joint tracking detection equipment.
Owner:TSINGHUA UNIV
High-frequency broadband frequency hopping signal generation device and method based on photon technology
ActiveCN113206706ALow costReduce transmission lossElectromagnetic transmittersLocal oscillator signalUp conversion
The invention provides a high-frequency broadband frequency hopping signal generation device based on a photon technology. The device comprises a laser, a low-frequency frequency hopping signal, a dual-polarization quadrature phase shift keying modulator DPQPSKM, a polarization controller, an optical circulator, a polarization beam splitter, a radio frequency local oscillator signal, an optical frequency shift module, an analyzer and a photoelectric detector. An optical modulator is used for carrying out electro-optical modulation on optical carriers and low-frequency frequency hopping signals output by a laser source to generate two paths of polarized orthogonal dual-wavelength optical signals, interference occurs after the two paths of polarized orthogonal dual-wavelength optical signals pass through a polarization controller, two paths of polarized orthogonal single-frequency optical signals are obtained, the two paths of polarized orthogonal single-frequency optical signals enter a Sagnac ring structure in the clockwise / anticlockwise transmission direction respectively, and single-frequency optical signal of the forward input optical frequency shift module is modulated to generate frequency shift; and the signals are polarized and combined by a polarization analyzer and then enter a detector for beat frequency, so that frequency multiplication and up-conversion operations on the low-frequency frequency hopping signals are realized. According to the invention, the working frequency band of the low-frequency frequency hopping signal is improved to a high-frequency domain by using an optical means, the working bandwidth is multiplied, the system control is flexible, and the tuning range is large.
Owner:AIR FORCE UNIV PLA
Novel method for analyzing leaked current of metal oxide lightning arrester
ActiveCN105467209AEliminate the fence effectEliminate Spectral Leakage EffectsSpectral/fourier analysisCurrent/voltage measurementFrequency spectrumFundamental frequency
The invention discloses a novel method for analyzing a leaked current of a metal oxide lightning arrester, and the method comprises the steps: firstly carrying out 10-cycle windowing, meeting the IEC standard, of a discrete sampling value (shown in the description) of a power grid signal; secondly executing nonsynchronous Hanning windowing; thirdly multiplying a frequency spectrum value at a corresponding spectral line k after DFT / FFT transformation by a twiddle phase factor (shown in the description) for two times; fourthly carrying out the superposition of amplitude vectors at frequency points obtained after transformation, so as to obtain the accurate values of the frequency, amplitude and phase parameters of the lightning arrester. The method can eliminate the picket fence effect and inhibit frequency spectrum leakage during fundamental frequency nonsynchronous sampling through the superposition of amplitude vectors at frequency points obtained after twiddle factor transformation, eliminates the impact from instantaneous large disturbances, and avoids errors appearing in a conventional FFT algorithm during nonsynchronous sampling or instantaneous large disturbances.
Owner:ZIYANG POWER SUPPLY COMPANY STATE GRID SICHUAN ELECTRIC POWER +2
Digital phase-locked amplifier combined with ratio operation
ActiveCN110971231AAvoid defectsReduce power consumptionPulse automatic controlHigh level techniquesLow-pass filterHemt circuits
The invention discloses a digital phase-locked amplifier combined with ratio operation and a lock-in amplification method thereof. The phase-locked amplifier comprises an input signal processing module, a reference signal generation module, an analog-to-digital conversion module and a digital processing module, the reference signal generation module outputs two paths of sine reference signals which are orthogonal to each other, and the digital processing module comprises a digital multiplier, a digital low-pass filter and a digital arithmetic unit. A wide signal input range can be achieved inthe signal detection process, the bandwidth requirement for a front-end amplification circuit is effectively lowered, and power consumption is reduced. By adopting ratio operation, the fluctuation gain brought by multiplicative noise in the circuit can be counteracted, so that the signal-to-noise ratio of the circuit is effectively improved. The invention can be widely applied to the field of weak signal measurement.
Owner:SHANGHAI JIAO TONG UNIV
Offshore wind power operation device and balancing device thereof
InactiveCN107856817AImprove securityImprove efficiencyVessel stability improvementMovement controllersElectricityOffshore wind power
The invention provides an offshore wind power operation device and a balancing device thereof. The balancing device comprises a multi-axis parallel robot, a tilt sensor, an acceleration sensor and a controller, wherein the multi-axis parallel robot comprises a static platform, a moving platform, a plurality of telescopic connecting rods and a plurality of driving mechanisms; the plurality of connecting rods are used for connecting the static platform with the moving platform; each of the plurality of driving mechanisms is respectively used for driving the corresponding connecting rod to telescope; the tilt sensor is used for measuring attitude parameters of the moving platform; the acceleration sensor is used for measuring position parameters of the moving platform; the controller is usedfor acquiring the attitude parameters and the position parameters, determining length adjustment values of the connecting rods according to the attitude parameters, the position parameters, attitude given values and position given values and controlling the connecting rods of the driving mechanisms to telescope according to the length adjustment values. The balancing device performs real-time position and attitude adjustment to maximize the offset of wave interference.
Owner:BEIJING ETECHWIN ELECTRIC
Active field compensation type digital ultralow frequency electromagnetic sensor
ActiveCN105629315AHigh local test accuracyAvoid influenceDetection using electromagnetic wavesEngineeringActive compensation
The invention discloses an active field compensation type digital ultralow frequency electromagnetic sensor, consisting of a sensor seal head, an SD card groove, a collection instrument cabin, a cushion block, an induction coil group, a sensor housing, a sensor shielding layer, and a magnetic core rod support. The invention utilizes a high performance CPU as a main controller, realizes the high accuracy data collection under a condition of low frequency and weak signal and stores the collected data into the SD card. The CPU starts up the active compensation system according to the real-time measurement temperature and vibration data in the data collection process, performs real-time automatic compensation on the collected signal, and effectively overcomes the affect on the test data due to the environment temperature and vibration. The invention has advantages of compensating the capability width and digitalized output.
Owner:JILIN UNIV +2
Current control method of cascaded sub-module working condition simulation system suitable for NLC
ActiveCN111965468AReduce manufacturing costOffset interferenceEfficient power electronics conversionElectrical testingCapacitanceCapacitor voltage
The invention provides a current control method of a cascaded converter sub-module working condition simulation system suitable for NLC, and the method is characterized by compensating a feed-forwardvoltage in a current controller to counteract the pulse voltage interference, caused by the nearest level control, of a to-be-measured object port, wherein the feed-forward voltage for compensating isgenerated through the following methods: method 1, calculating the difference value of the numbers of input sub-modules of two sub-module groups to be measured, and multiplying the difference value by the capacitor voltage of a single sub-module so as to generate the feed-forward voltage; and the method 2 comprises the following steps: sampling a voltage signal of a port of a to-be-measured object, carrying out low-pass filtering on the voltage signal, and taking the filtered voltage signal as the feed-forward voltage; and the feed-forward voltage is compensated into the current controller, so that current distortion caused by pulse voltage interference is avoided. Meanwhile, the invention provides a cascaded converter sub-module working condition simulation system and a sub-module test method. According to the invention, the working condition simulation of the cascaded converter sub-module based on nearest level control can be better realized.
Owner:SHANGHAI JIAOTONG UNIV
Antenna unit and multi-input and multi-output antenna system
InactiveCN107146956AOffset leak signalOffset interferenceDifferential interacting antenna combinationsMulti inputElectronic switch
The invention provides a multi-input and multi-output antenna system, which comprises a first antenna unit and a second antenna unit. The first antenna unit includes a first transmitter, a first receiver, a first circulator, a first compensation circuit, a second compensation circuit, a first antenna and a first electronic switch. The second antenna unit comprises a second transmitter, a second receiver, a second circulator, a third compensation circuit, a fourth compensation circuit, a second antenna and a second electronic switch. The first compensation circuit and the third compensation circuit are used for resisting and reducing leakage signals. The second compensation circuit and the fourth compensation circuit are used for resisting and reducing near-field interference signals. The multi-input and multi-output antenna system can effectively resist and reduce the noise.
Owner:NANNING FUGUI PRECISION IND CO LTD
Current detection error compensation method and circuit in a voltage drop type power level circuit
PendingCN108768139AAccurate Current Excessive SignalOffset interferencePower conversion systemsEfficient power electronics conversionZero crossingPower level
The invention provides a current detection error compensation method and circuit in a voltage drop type power level circuit, which samples and offsets a voltage and is fed back to a current sampling module as a feedback signal. The cancellation voltage is used as an input signal to compensate and cancel the interference signal caused by the parasitic inductance on the power MOS device. The cancellation voltage is fed back to the current sampling module as the feedback signal, which can be used as the input signal compensation to offset the interference caused by the parasitic inductance of thepower level circuit, so as to obtain more accurate current zero-crossing detection signals and excessive current signals.
Owner:SICHUAN ENERGY INTERNET RES INST TSINGHUA UNIV
Path tracking device and method for farmland operation machine
ActiveCN106546253AReduce labor intensityImprove efficiency and qualityInstruments for road network navigationClimate change adaptationMicrocomputerPath tracking
The invention relates to a path tracking device and method for a farmland operation machine. The device includes an Android upper computer and a lower computer module which are connected through a Bluetooth module. The lower computer module comprises a single-chip microcomputer, a geomagnetic sensor, a DGPS module, the Bluetooth module, a Zigbee module, a Flash memory and a power module; the lower computer module is used for receiving and storing path information sent by the Android upper computer; a planned path starting point serves as a first approaching point Q, the farmland operation machine is driven to be close to the Q point, after the farmland operation machine reaches the path starting point, a second approaching point of the farmland operation machine is found by drawing a circle in a neighbor region, and by repeating the motion continually, tracking of the whole path is achieved. The device allows the farmland operation machine to conduct accurate tracking on the planned path, the labor intensity of farming personnel in a traditional mode is greatly reduced, and the agricultural production efficiency is improved.
Owner:SHANDONG AGRICULTURAL UNIVERSITY
Anti-interference tracking control design method based on T-S fuzzy interference modeling
PendingCN113126491AOffset interferenceAvoid harmComplex mathematical operationsAdaptive controlAutomatic controlInterference resistance
The invention discloses an anti-interference tracking control design method based on T-S fuzzy interference modeling in the technical field of automatic control. The method comprises the following steps: 1, establishing a system state equation containing external interference; 2, establishing an interference model through a T-S fuzzy model, designing a PI tracking controller, and constructing a composite system; 3, designing a disturbance observer; 4, designing a compound control system based on the disturbance observer and the PI tracking controller; and 5, solving the control gain and the observer gain based on a convex optimization algorithm. The method realizes the effective suppression of system interference and dynamic tracking of system output, and having good robustness and high stability.
Owner:YANGZHOU UNIV
Common station address interference elimination system and method
InactiveCN101453228BOffset interferenceTransmissionWireless communicationInterference eliminationInterference cancelation
Owner:PANASONIC CORP
Vertical rotor system with active vibration suppression function and active vibration suppression method thereof
PendingCN110778604AImprove vibration suppression performanceRealize self-configurationRotating vibration suppressionRotary bearingsMagnetic bearingControl signal
The invention discloses a vertical rotor system with an active vibration suppression function and an active vibration suppression method thereof. The vertical rotor system is composed of a driven rotor main shaft, a bearing box with a spherical hinge support, a variable rigidity and damping electromagnetic bearing, a sensor, a measuring transmitter, a controller and a working section, wherein thedriven rotor main shaft is used for generating rotating mechanical energy to drive the working section to do work, the working section can be arranged at the top end or the bottom end of the driven rotor main shaft according to the working requirement of the rotor system, a bearing in the bearing box is used for supporting a rotor, the spherical hinge support is used for vibration reduction, and the sensor, the measuring transmitter, the controller and the variable rigidity and damping electromagnetic bearing forms an active vibration suppression system which is used for realizing active vibration suppression of the rotor subsystem. By detecting the vibration of the rotor, analyzing the vibration of the rotor to generate a control signal to adjust the rigidity and damping of the electromagnetic bearing, thereby outputting the corresponding damping force, and achieving active suppression of vibration of the vertical rotor system.
Owner:BEIJING UNIV OF CHEM TECH
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