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1800 results about "Interference immunity" patented technology
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Interference immunity. The interference immunity describes the desired resistance of an electrical device to externally acting interfering influences. A device is regarded as resistant to interference when it operates undisturbed by a certain level or reference value of an external source of interference.
Interference protection
InactiveUS7239657B1Memory record carrier reading problemsTransmissionInterference resistanceChecksum
Apparatus and a method for enhancing the interference resistance of so-called RFID systems, wherein identification messages delivered from an identification device are longer than the time for which an anticipated interference or disturbance is calculated to continue, and wherein the messages contain redundancy, such as a checksum. The messages are delivered from the identification device repetitively, and are redundancy checked. In the event of any discrepancy in the redundancy check, such as when the checksum is checked against the data content of the message and is found in disagreement, successive messages are checked bit for bit against each other. Any deviations between otherwise previously rejected messages are assumed to be due to external interference and are thus successively substituted until the redundancy check gives an accepted result, such as through the medium of a checksum check according to the so-called CRC method.
Owner:TAGMASTER AB
UWB dual tunnel diode detector for object detection, measurement, or avoidance
InactiveUS6239741B1Baseband system detailsAmplitude-modulated carrier systemsUltra-widebandTunnel diode
A highly sensitive, high-speed dual tunnel diode detector is described for use in Ultra Wideband (UWB) object detection systems, such as a radar. The extended capability of the detector to both extremely short (sub-foot) and long distance (tens of thousands of feet) ranges is unique and permits the application of low power UWB radar to a wide variety of applications including high resolution radar altimetry at altitudes exceeding 10,000 feet and for autonomous on-deck landing operations (e.g., one-foot altitudes), the detection of extremely low radar cross section (RCS) targets for such applications as suspended wire detection for helicopters and other manned and unmanned craft, etc. High noise and interference immunity of the detector permits co-location of a UWB radar sensor with other active systems. The invention has immediate and significant application to all areas, both military and commercial, of precision distance measurement, intrusion detection, targeting, etc. over a wide range of distances.
Owner:ZEBRA TECH CORP
Spread spectrum transceiver module utilizing multiple mode transmission
InactiveUS20040077353A1Guaranteed uptimeMaximizing operational flexibilityPower managementTransmission control/equalisingDigital dataTransceiver
Owner:MAHANY RONALD L
GPS/SINS (global positioning system/strapdown inertial navigation system) combined navigating system with high anti-interference performance and realizing method thereof
InactiveCN102353970AAvoid saturationAvoid blockingSatellite radio beaconingComplex typeElectromagnetic interference
The invention discloses a GPS / SINS (global positioning system / strapdown inertial navigation system) combined navigating system with high anti-interference performance and a realizing method thereof, which belong to the technical field of navigation. The system comprises a GPS array antenna, a radio-frequency front end, an interference inhibiting module, a GPS baseband processing link, an SINS module and a combined navigating unit. The method comprises the following steps: 1, receiving a GPS signal and treating the GPS signal by the radio-frequency front end; 2, detecting high-power electromagnetic interference; 3, regulating an antenna beam in a self-adaptive way and filtering to remove a high-power interference signal; 4, carrying out the navigation resolution and the information fusion of a GPS and an SINS; and 5, obtaining an auxiliary parameter. The system and the realizing method have favorable dynamic tracking capability and anti-interference performance; the high-power interference signal can be effectively prevented from causing the saturation and the jamming of a GSP radio-frequency front end; and the robustness performance of the navigating system for dealing with a complicated interference environment is improved.
Owner:BEIHANG UNIV
Smart antenna CDMA wireless communication system
InactiveUS6980527B1Increase capacityImprove performanceSynchronisation arrangementSpatial transmit diversityFir systemDownlink beamforming
A TDD antenna array S-CDMA system for increasing the capacity and quality of a wireless communications is disclosed. By simultaneous exploiting the spatial and code diversities, high performance communications between a plurality of remote terminals and a base station is achieved without sacrificing system flexibility and robustness. The time-division-duplex mode together with the inherent interference immunity of S-CDMA signals allow the spatial diversity to be exploited using simple and robust beamforming rather than demanding nulling. Measurements from an array of receiving antennas at the base station are utilized to estimate spatial signatures, timing offsets, transmission powers and other propagation parameters associated with a plurality of S-CDMA terminals. Such information is then used for system synchronization, downlink beamforming, as well as handoff management. In an examplary embodiment, the aforementioned processing is accomplished with minimum computations, thereby allowing the disclosed system to be applicable to a rapidly varying environment. Among many other inherent benefits of the present invention are large capacity and power efficiency, strong interference / fading resistance, robustness power control, and easy hand-off.
Owner:BEIJING XINWEI TELECOM TECH
GPS access system and method
ActiveUS7042392B2Improve anti-clogging performanceInstruments for road network navigationPosition fixationGps receiverLow earth orbit
This invention describes a means for acquiring GPS P / Y code under jamming conditions. It improves jam resistance by augmenting a component of the GPS signal with one from a different satellite system, such as a low earth orbiting (LEO) satellite. The preferred embodiment of this invention employs the Iridium LEO satellite constellation broadcasting in a 10 MHz wide band about 1,621 MHz. A low-cost, integrated Iridium receiver coupled to the GPS receiver employs a single antenna that is capable of receiving both the GPS and Iridium signals together.
Owner:THE BOEING CO
Video processor for endoscopy
InactiveUS20050018042A1Improve immunityEndoscopesColor television detailsFlexible endoscopeEndoscopic camera
A video processor for endoscopic camera or for videoendoscopic probe associated with a color video sensor, the video processor comprising: a signal preprocessing circuit designed to be remotely connected to the video sensor through an electrical link without any intermediate connection device, the preprocessing circuit comprising a first signal processor for generating from image signals output by the video sensor raw video signals comprising a brightness signal and a color signal, these signals being not usable directly because they are phase shifted and are noisy due to synchronization residues, and a synchronizing circuit for synchronizing the video sensor and the first signal processor; and a remote auxiliary circuit comprising a second signal processor connected to the first signal processor through a low impedance electrical link providing good immunity to interference, the second signal processor generating from said raw video brightness and color signals at least one useful video signal according to an international video standard.
Owner:TOKENDO
Method and system for orthogonal modulation of power signals
ActiveCN105067880AImprove accuracyImprove anti-harmonicCurrent/voltage measurementVoltage-current phase angleLower limitFrequency vector
The invention discloses a method and a system for orthogonal modulation of power signals. The method comprises the following steps: acquiring an initial sequence length and an initial sequence according to a frequency lower limit, a preset sampling frequency and an initially set integer signal cycle number of a power signal; acquiring a reference frequency according to the initial sequence, and further acquiring a unit cycle sequence length and a preset sequence length; acquiring first forward and reverse sequences according to a preset sequence starting point and the preset sequence length; generating first real-frequency and imaginary-frequency vector sequences and second real-frequency and imaginary-frequency vector sequences according to the first forward and reverse sequences; converting obtained first and second phases into a first forward sequence average initial phase; obtaining a new preset sequence starting point according to the average initial phase; and obtaining a cosine function modulation sequence and a sine function modulation sequence according to second forward and reverse sequences obtained from the initial sequence. By adopting the method and the system of the invention, an orthogonal modulation sequence with consistent amplitude height can be obtained, and the accuracy and anti-jamming performance of sinusoidal parameter calculation are improved.
Owner:ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
AC. frequency monitoring method
ActiveCN1815248APrecise positioningEliminate harmonicsFrequency to pulse train conversionAlternating currentSmall data
The method includes steps: sampling AC current to be monitored; based on sampled values, looking up crossover points of the sampled waveform; calculating period T of AC current to be monitored based on crossover points; calculating frequency of AC current monitored. Crossover points are searched through software directly so as to reduce hardware spending. Averaging results of multiple times of calculation obtains final outcome in high precision. Anti-interference ability is high since questionable data including too large and too small data are thrown off. Advantages are: simple and reasonable, accurate and reliable data, and high practicability.
Owner:VERTIV CORP
Method and system for automatically testing anti-interference performance of Beidou receiver
The invention provides a method and a system for automatically testing the anti-interference performance of a Beidou receiver. The method comprises the following steps: a satellite signal and interference signal simulation source receives setting parameters transmitted by an upper computer, simulates a motion track and state of a user and generates a Beidou satellite navigation signal and various interference intermediate frequency digital signals; the generated Beidou satellite signal and multiple interference signals are transmitted from different positions and directions through antennas through digital / analog (AD), up-conversion and power regulation; a tested receiver is arranged on a rotating platform and rotates along the rotating platform; and the receiver simultaneously receives the satellite signal and multiple interference signals, finishes anti-interference processing, signal processing and navigation calculation of the signals, outputs corresponding positioning results in different interference modes and outputs the results to the upper computer, and the upper computer finishes the anti-interference performance evaluation of the receiver and outputs the evaluation result. The anti-interference capacity of the receiver in the time domain and the frequency domain can be tested, and the anti-interference capacity of the receiver in the space domain can be tested.
Owner:GUILIN UNIV OF ELECTRONIC TECH
Video fire hazard smoke detecting method based on color saturation degree and movement mode
InactiveCN101441771AAccurate detectionImprove anti-interference abilityImage analysisCharacter and pattern recognitionVideo imageFalse alarm
The invention discloses a method for detecting fire disaster smog by video on the basis of color saturation and motion mode, which comprises the following steps: firstly, extracting a foreground motion block from a video image acquired by a monitoring camera through a difference method; secondly, detecting the color saturation of the foreground motion block, estimating the direction of the motion block, and calculating the cumulant and the main moving direction of the motion block; and thirdly, calculating the color saturation detection percentage of each region, the average cumulant and the main moving direction ratio to form a characteristic vector, and adopting a Bayesian classifier to judge whether the smog is the fire disaster smog. The detection of the color saturation reflects a rough color distribution of the smog and eliminates a large amount of foreground interfering objects with glowing colors. The color detection in a blocking mode further improves the anti-interference performance of a system. The cumulant shows the characteristic of continuous movement nearby a smoldering point of the smog, and has very good anti-interference performance for a non-reciprocating object. The comprehensive utilization of the color saturation detection percentage, the average cumulant and the main movement ratio can greatly reduce the rate of false alarm for the system.
Owner:UNIV OF SCI & TECH OF CHINA
Train unmanned system and method
ActiveCN103010230AReal-time reflection analysisEasy to analyzeLocomotivesDriver/operatorInterference resistance
The invention discloses a train unmanned system and a train unmanned method, belonging to the field of traffic control. The system comprises a sensor, an automatic train protecting system connected with the sensor, a train-mounted recording system connected with the automatic train protecting system, an automatic train driving system connected with the automatic train protecting system, and a man-machine interaction system connected with the automatic train protecting system. By utilizing the system and the method, the precise control on the unmanned operation process of a train is realized, misoperation caused by artificial factors is reduced, the interference resistance is good, the working intensity of drivers is reduced, the security in train operation is improved, the departure interval of trains is shortened, and the operation efficiency of train routes is improved.
Owner:TRAFFIC CONTROL TECH CO LTD
Spread spectrum transceiver module utilizing multiple mode transmission
InactiveUS20040077352A1Guaranteed uptimeMaximizing operational flexibilityPower managementTransmission control/equalisingDigital dataTransceiver
Owner:AVAGO TECH INT SALES PTE LTD
Sliding-mode control method of permanent magnet synchronous motor based on reaching law and disturbance observation compensation
ActiveCN109450320AEliminate chatterImprove anti-interference abilityElectronic commutation motor controlVector control systemsControl systemPermanent magnet synchronous motor
The invention provides a sliding-mode control method of a permanent magnet synchronous motor based on reaching law and disturbance observation compensation. A new reaching law algorithm is designed, and applicable in design of a speed controller in a sliding-mode variable structure; simultaneously, a saturation function is used in a disturbance observer control law, and used for improving a disturbance observer; a value observed by the disturbance observer is compensated in the speed controller; and therefore, a new control strategy is formed. The new control method is applicable in a vector control system of the permanent magnet synchronous motor; a current-speed double-closed-ring control structure is adopted; for buffeting and anti-interference problems in the sliding-mode control, an integral sliding-mode surface and a new reaching law are added based on the conventional sliding-mode speed controller; simultaneously, the disturbance observer is added; disturbance due to load changeis effectively inhibited; the responsiveness of the system is improved; buffeting of the system is reduced; and the anti-interference performance and the robustness of the system in a complex environment are obviously improved.
Owner:ZHEJIANG SCI-TECH UNIV
Efficient OFDM communications with interference immunity
ActiveUS7061854B2Increase data rateImprove anti-interference abilityTime-division multiplexMulti-frequency code systemsFrequency reuseQuadrature modulation
The present invention relates to employing OFDM modulation in combination with spatial diversity and space-time block coding to provide high data rates and exceptional interference immunity. For transmission, quadrature modulated data is encoded in space and time to create individual series of encoded symbols. Each of these series of encoded symbols is subjected to a type of inverse Fourier Transform in corresponding transmission paths. In each transmission path, cyclic extensions may be appended to the resultant symbols, which are subsequently converted to an analog format, modulated, amplified, and transmitted from one of multiple antennas. Preferably, such communications are implemented from base stations to mobile terminals in an environment where the frequency reuse factor is approximately one and the base stations are synchronized to a common clock signal.
Owner:APPLE INC
Method for calibrating phase of DQS (bidirectional data strobe) delay for DDR (double data rate) controller and apparatus thereof
ActiveCN102347081AImprove stabilityImprove anti-interference abilityStatic storageDouble data rateScreening method
The invention discloses a phase calibration method of the DQS delay for a DDR controller and an apparatus thereof. The method comprises the following steps: 1, sampling DDR data DQ according to trigger signals after different grade delays of a DQS signal; 2, comparing the data DQ acquired by sampling with a preset self-check datum in byte, and acquiring a minimum boundary delay parameter and a maximum boundary delay parameter through delaying for two beats; 3, endowing a mean value of the minimum boundary delay parameter and the maximum boundary delay parameter to a DQS selection signal; and 4, delaying the DQS signal according to the output clock of the DQS selection signal to obtain a DQS signal at the center of an effective datum window. According to the invention, the phase calibration of the DQS delay is realized through adopting a delay parameter determination unit and hardware in a delay parameter output circuit, and the delayed DQS can accurately fall on the center of the effective datum window through a datum screening method with the delay parameter determination unit, thereby the stability, the accuracy and the interference immunity of datum sampling are enhanced.
Owner:LEADCORE TECH
Living creature characteristic recognition system
InactiveCN101483652AOvercome limitationsReduce computing burdenUser identity/authority verificationCharacter and pattern recognitionFault toleranceNetwork structure
The invention discloses a biological characteristic identifying system. By adopting a double-mode identifying method, complementarity and pertinency laws between characteristics of multiple living things such as face of human being, voice, fingerprint and the like, limitation of single mode biological characteristic identifying can be avoided effectively, and the system based on a client / server network structure model for biological characteristic identifying reduces the network transmission data amount effectively and reduces the heavy burden of server operation by utilizing a limited bandwidth, and the system has advantages of fault tolerance, extendibility, interference immunity, robustness and environment adaptability.
Owner:WUYI UNIV
CT slip-ring system based on optical fibre data-transmission
ActiveCN1989905AImprove anti-interference abilityOvercoming problems such as susceptibility to interference from external electromagnetic fieldsMaterial analysis using wave/particle radiationComputerised tomographsData acquisitionInstability
A CT slip-ring system based on optical fibre data transmission applies to the CT system which consists of stationary part and rotating part scanning rotary in said stationary part. It transmits the data from collected from data collect system to external part of rotating part using non-contact optical signals, then transmits the signals to image reconstruction system to reconstructing images after light / electricity conversion. Die to the invention uses the CT slip-ring system based on optical fibre to transmitting data, the interference immunity is strong, it overcomes the problems of data signal reliability decreasing lead by instability of contact resistance when contact-devices transmit data signals and the interference of external electromagnetic field is easier when non-contact wireless capacity coupling transmits data signals and other issues, and meets the requirement of high speed and low error code rate of CT system data transmitting.
Owner:SIEMENS SHANGHAI MEDICAL EQUIP LTD
Laser radar interference immunity enhancing method and system
ActiveCN107728156AGuaranteed reliabilityIncrease refresh rateElectromagnetic wave reradiationWhole bodyOptoelectronics
The invention provides a laser radar interference immunity enhancing method comprising the following steps: carrying out non-continuous multiple scanning for a random single target point, and carryinglaser fast coding for each time scanned laser signal. The multiple measuring behaviors aiming at each target point are non-continuous under fast scanning conditions, thus ensuring the measuring result high refresh rate and reliability; the laser fast coding is to convert the pulse signals in a single pulse period of the existing pulse laser into continuous and / or discrete subpulses with at leasttwo different pulse intensities and / or pulse widths; a series of subpulses as a whole body in the single pulse period can form a detection signal unit of the single target point emitted by the laser radar. The fast coding method is applied to each measuring time of the single target multiple measures, thus further enhancing the laser radar measuring reliability in each time, reducing the single target measuring frequency on said basis, and further improving the measuring result refresh rate.
Owner:XI AN ZHISENSOR TECH CO LTD
Digital electronic detonator chip based on double-wire bus and control method
ActiveCN109696097AImprove Clock Frequency AccuracyStandardize the control processBlastingDetonatorCommunications security
The invention relates to a digital electronic detonator chip based on a double-wire bus and a control method. The chip adopts the non-polar and one-leader-multiple-follower half-duplex type double-wire bus with communication and power supply functions, and communication of an amplitude and pulse width modulation modes is supported; during pulse width modulation communication, a downlink communication standard pulse width value can be configured according to needs, and a uplink communication standard pulse width value is fixed; the chip comprises all the function modules for completing the detonation operation and a communication instruction set, a charging voltage value can be externally configured; the chip control method is composed of 'detonator chip information injection and detonatorchip on-site detonation'; and through the mode, the digital electronic detonator chip and the control method can meet requirements and practical application demands of the latest Chinese public security industry standard, namely the 'Industrial Electronic Detonator Information Management General Rule(GA1531-2018) ', the anti-interference performance and the communication safety reliability are improved, the application scene is expanded, the configurability and the detonation safety of the chip are improved, the control process is standardized, improper operation is avoided, and the comprehensive cost is reduced.
Owner:华夏世昌(北京)科技有限公司
Multiple-input-multiple-output radar waveform design method
ActiveCN104898113AEasy to detectImprove efficiencyRadio wave reradiation/reflectionFrequency spectrumMultiple input
A multiple-input-multiple-output radar waveform design method belongs to the radar communication technical field, and aims to provide a design method with lower related sidelobe and frequency spectrum inhibition depth, high efficiency, less consumption, high robustness, and excellent time frequency anti-interference performance; the method comprises the following steps: pre-evaluating an autocorrelation sidelobe inhibition fuzzy region according to a relative position between a strong scatterer and a to be measured object in a radar scene, thus forming a corresponding object function; analyzing MIMO radar waveform orthogonality constraint so as to form the object function satisfying the orthogonality constraint; pre-evaluating a frequency domain interference fuzzy frequency band zone according to scene prior information, thus forming the corresponding object function; forming a constant modulus phase coding waveform constrained condition; forming a loose alternative projection algorithm framework; solving a waveform design according to the loose alternative projection algorithm framework, thus providing three waveform optimization output modes. The loose alternative projection constant modulus waveform coding design enables the MIMO radar to have batter detection performance.
Owner:HARBIN INST OF TECH +1
Anti-jamming array antenna
InactiveUS6124828AReduce processing loadRadio wave direction/deviation determination systemsCommunication jammingAnti jammingPhase shifted
This array antenna with anti-jamming in reception for radioelectrical or ultrasound waves is provided with radiating elements fitted out individually or in groups with amplitude-controlled and phase-controlled passive or active modules enabling aiming at transmission as well as at reception by analog beam-forming. It possesses a reception anti-jamming circuit carrying out successively two reduced, adaptive computational beam-forming operations, one in elevation which is performed on a grouping, in horizontal alignments, of the reception signals of the radiating elements and working on the reception signals by modifying the settings of the controlled modules and the other in relative bearing, performed on a grouping, in vertical alignments, of the signals of the radiating elements that which it phase-shifts and adds up to form a reception channel for the total antenna. The reception anti-jamming thus obtained has performance characteristics comparable to those that would result from a full adaptive beam-forming operation. At the same time, it requires a far smaller volume of processing.
Owner:THOMSON CSF SA
A port field data acquisition, transmission and issuance system based on Zig Bee technology
InactiveCN101216986ASolve field workResolution statusTransmission systemsData switching by path configurationWeb serviceData acquisition
A port on-site data acquiring, transmitting, sending and issuring system based on zigbee technology in the remote monitoring and controlling field of electromechanical equipment, comprises a wireless sensing network and a remote data server, wherein the wireless sensing network is distributed in a port working field, and can acquire working state data of the port field, collect the intra-network acquired data in a zigbee wireless manner, pack the collected data, and transmit to the remote data server via wired enterprise in-house network based on a transmission control protocol and an internetwork protocol. The remote data server can receive the data based on the transmission control protocol and the internetwork protocol, resolve the data according to the packed data transmission format, store the data in a database, and issue the data in a web service mode. The invention provides data support for monitoring application program development, failure pre-warning and equipment maintenance. In addition, the low-cost zigbee technology can reduce system complexity, and has good anti-interference performance, expandability and practicability.
Owner:SHANGHAI JIAO TONG UNIV
Method and device of remote underwater acoustic communication
InactiveCN102122993AImprove real-time performanceIncrease success rateTransmissionSuccessful transmissionBuoy
The invention discloses a method and a device of remote uderwater acoustic communication. The device comprises more than one underwater communication nodes and more than one abovewater communication buoys which are responsible for communication with more than one underwater communication nodes within a set distance range through an underwater acoustic channel; and the communication connection is carried out between the abovewater communication buoys through a land wireless channel. In the method, the multi-frequency band combination is adopted to sent data in parallel, and the remote communication is realized by uniting the communication buoys; in the remote communication, a three-time handshake protocol in the carrier sense multiple access (CSMA) needs not to be used in the communicationbetween the underwater communication nodes and the buoys, while a channel can be directly monitored in a full frequency range; the data are synchronously sent to the abovewater communication buoys inparallel on each subchannel on the monitored idle channel by utilizing a frequency modulation method; and the data is transmitted by the abovewater communication buoys through a radio wave manner. Bythe method and device provided by the invention, one-time successful transmission probability of the two parties of the communication can be improved, and the anti-interference performance of a system is enhanced.
Owner:SOUTH CHINA UNIV OF TECH
Heartbeat frequency detection algorithm of non-contact vital sign detection system
InactiveCN105232026AEfficient extractionAccurate heart rate informationDiagnostic recording/measuringSensorsHuman bodyBandpass filtering
The invention provides a heartbeat frequency detection algorithm of a non-contact vital sign detection system; the steps are: respectively doing bandpass filtering for I and Q two way signals outputted by a continuous wave doppler radar; using a center estimate algorithm to carry out useful dc component recovery; using a complete cluster experience modal decomposition algorithm to separate a heartbeat signal from a human body jitter signal, a breathing signal and environment interference noises; resolving a Hilbert marginal spectrum of each decomposition signal and doing peak value detection; finding out the Hilbert marginal spectrum corresponding to the heartbeat signal according to a marginal spectrum peak position and energy concentration degree close to the spectrum peak; obtaining heartbeat frequency information according to the spectrum peak position. The heartbeat frequency detection algorithm can effectively extract the heartbeat signal under unstable human body and large environment interference noises, thus obtaining accurate heartbeat frequency information, improving anti-interference property of the non-contact vital sign detection system, and satisfying heartbeat frequency detection accuracy demands of medical affairs personnel.
Owner:WUXI NANLIGONG TECH DEV
Realization method of fast frequency hopping communication
InactiveCN102651655AShort synchronization timeLow probability of out of syncTransmissionComputer scienceError correcting
The invention relates to a realization method of fast frequency hopping communication. The method is based on the frame synchronization technology, synchronization information is contained in protocol frames, the confirmation is carried for three times to ensure that the normal and stable synchronization is built between a host machine and a sub machine, and further, the synchronization information enters the fast frequency hopping communication process. Two kinds of frames: protocol frames and data frames are used in the communication process. In the synchronization building and frequency hopping communication processes, the protocol frames and the data frames are respectively subjected to interweaving coding with higher error correcting and checking capability and Reed-Solomon (RS) coding (Reed-Solomon is a code invented by IrvingStoyReed and GustaveSolomon who are American mathematicians and engineers), the transmission reliability is ensured, and the anti-interference capability is improved. During the frequency hopping communication, chaos sequences generated based on logistic mapping (a logic mapping provided by PierreFran oisVerhulst) are adopted as frequency hopping patterns, so the randomness of the frequency hopping frequency is enhanced, and the anti-interference performance and the detection resistance performance of a frequency hopping radio station are improved.
Owner:BEIJING UNIV OF CHEM TECH
High potential direct current (DC) voltage energy-taking power supply
ActiveCN102097948AGuarantee working reliabilityGuarantee power supply reliabilityDc-dc conversionElectric variable regulationEngineeringGalvanic isolation
The invention provides a high potential direct current (DC) voltage energy-taking power supply which is good in electrical isolation performance, and is capable of meeting the requirement of power supply of a high potential electronic circuit and stably working under the condition of wider DC input voltage range; and the DC voltage energy-taking power supply is rapid in starting speed so as to maintain stable rated output under the condition of lower DC voltage input, is good in anti-interference performance so as to be capable of normally working in the severe electromagnetic environment and is small in volume so as to meet the compact design of a device.
Owner:CHINA EPRI SCIENCE & TECHNOLOGY CO LTD +2
Integrated desk-type signal simulation platform for satellite navigation anti-interference test, and application method for integrated desk-type signal simulation platform
InactiveCN106646540AAnti-interference is simple and effectiveSimple and effective test evaluationSatellite radio beaconingObservation dataTest requirements
The invention discloses an integrated desk-type signal simulation platform for a satellite navigation anti-interference test, and the platform comprises a control module which is used for setting scene parameters according to different performance test requirements, generating a navigation message and observation data according to a navigation algorithm, and transmitting the generated data and interference signal parameters to an FPGA; and a signal generation module which is used for generating a navigation signal and an interference signal. The platform is characterized in that, compared with the prior art, the platform achieves the simple and effective testing and evaluation of anti-interference performances of navigation receiving equipment; the platform controls a signal simulation source to generate the satellite navigation signal and the interference signal; the receiving equipment decodes the received mixed signal, and transmits the positioning speed measurement information to the control module for the evaluation of anti-interference performances.
Owner:TRANSCOM INSTR
Control device of digital electric steering engine and control method
InactiveCN103231798AEasy to controlHigh steady state accuracyWith power amplificationControl signalCurrent sensor
The invention provides a control device of a digital electric steering engine and a control method. The control method comprises the steps that a steering surface deflection angle given signal is subjected to voltage transformation, filtering and amplitude limiting processing by a signal conditioning circuit, and sent to a controller DSP (Digital Signal Processor) by AD (Analogue-to-Digital) conversion; the DSP outputs a digital control signal; the digital control signal is subjected to digital isolation and then sent to a driving circuit to be converted into a power control signal; a brushless DC (Direct Current) motor is controlled to operate by controlling a main power circuit, and drives a steering surface to deflect through a transmission gear set to follow the steering surface deflection angle given signal; the bus current of the brushless DC motor is sampled by a current sensor and fed back to the DSP; an angle sensor connected with the transmission gear set feeds back a current deflection angle of the steering surface in real time and sends the current deflection angle to the DPS. The control device and the control method effectively accelerate frequency response of a brushless DC electric steering engine, and improve the interference immunity of a system.
Owner:NORTHWESTERN POLYTECHNICAL UNIV
Anti-interference attitude control method for four-rotor unmanned aerial vehicle
ActiveCN107491081AAttitude control is fast and stableImprove anti-interference abilityAttitude controlRadial basis function neuralAttitude control
Through designing a radial basis function neural network compensator to estimate coupling between channels, a model uncertainty part and external interference, a pole-placement method is used to determine a gain initial value of a fractional order proportional differential controller, the control performance is further improved by the fine adjustment of a fractional order differential order number, the flexibility of a system is enhanced, finally a feedback linearization controller is designed to obtain a control amount, and the stable attitude control with strong anti-interference for a four-rotor unmanned aerial vehicle is realized. The invention has the advantages that an unmodeled part of the system, the coupling effect between the channels and the external interference are considered, and the universality of an attitude control method is improved. Through designing a radial basis function neural network estimator to estimate the unmodeled part of the system, the coupling effect between the channels and the external interference for compensation, the system has good anti-interference ability. On the basis of traditional proportional differential control, fractional order differential is introduced to improve the control performance and flexibility of the system.
Owner:NORTHWESTERN POLYTECHNICAL UNIV
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