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41results about How to "Increase the carrier frequency" patented technology
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Noise correlation radar devices and methods for detecting targets with noise correlation radar
InactiveUS8035551B1Instantaneous band widthIncrease the carrier frequencyRadio wave reradiation/reflectionRadar systemsFrequency modulation
A pulsed compression noise correlation radar uses noise modulation and pulse compression technology to scramble recognizable transmit signal characteristics and reduce transmit energy. The pulsed noise correlation radar advantageously uses pulse compression technology, a pulsed linear frequency modulated noise correlation mixer, and a new and innovative noise fused waveform to automatically correlate the pulsed linear frequency modulated (LFM) noise waveform with the received signal. The pulsed noise correlation radar apparatus and system now make it possible to effectively reduce transmitting power, preserve high band widths through oversampling in the receiver, and achieve multi-channel array frequency diversity. A secure pulsed compression noise correlation radar system and methods for undetected target detection with pulsed noise correlation radar and a pulsed LFM fused noise waveform are also provided.
Owner:ARMY US SEC THE
Carrier synchronization method and device for parallel power generation of many inverters
InactiveCN106981883APromote circulationShorten the carrier cycleSingle network parallel feeding arrangementsCarrier signalPower inverter
The invention creates the field of new energy power generation, and particularly relates to a carrier synchronization method for parallel power generation of many inverters. A carrier frequency of an inverter C1 is same as carrier frequencies of other inverters, the carrier period is shortened, namely, the carrier frequency of the inverter C1 is increased if a carrier output from the inverter C1 lags behind a power grid waveform in a phase, and the carrier period is prolonged, namely, the carrier frequency is slowed if the carrier output from the inverter C1 is ahead of the power grid waveform in the phase. Compared with the prior art, the method has the advantage that carrier synchronization between two inverters can also be achieved without additionally arranging a traditional complicated master-slave control architecture, and circulation between two inverters is improved. The method created by the invention can be implemented by building a functional module and combining a functional module architecture and by a computer program stored in a computer readable storage medium.
Owner:EAST GRP CO LTD
Power conversion device and method for controlling thereof
ActiveUS20110292700A1Highly compactImprove efficiencyElectronic commutation motor controlAC motor controlLower limitElectrical conductor
In a power conversion device that includes a PWM converting means for generating a PWM pulse by comparing three-phase voltage commands with a triangular wave carrier signal, a power converter for converting between a DC voltage and a three-phase AC voltage by driving a switching element according to the PWM pulse, a current detecting means for detecting a pulsed current flowing through a DC bus conductor of a main circuit, and a voltage command correcting means for correcting three-phase voltage commands, which corrects the three-phase voltage commands so that a line voltage value between the maximum phase and an intermediate phase and a line voltage value between the intermediate phase and the minimum phase are each equal to or larger than a predetermined value, the maximum phase, intermediate phase, and minimum phase being determined in correspondence to momentary values of the three-phase voltage commands arranged in descending order, if the voltage command is outside an allowable upper limit or lower limit, not only the voltage command for the maximum phase and / or the minimum phase but also the voltage command for the intermediate phase are corrected.Accordingly, the inability to detect a current due to a restriction imposed by an upper limit or a lower limit for an output voltage is eliminated, and highly precise control of the power conversion device is achieved independently of the situation.
Owner:HITACHI IND EQUIP SYST CO LTD
SVPWM (Space Vector Pulse Width Modulation) control method for Z-source inverter
InactiveCN102969921AReduce switching timesSmall rippleDc-ac conversion without reversalZ-source inverterEngineering
The invention relates to an SVPWM (Space Vector Pulse Width Modulation) control method for a Z-source inverter, belongs to the technical field of inverter control and solves the problem of generation of a larger inductive current ripple caused by the existing SVPWM control method for the Z-source inverter. The states of three switching tubes of an upper bridge arm are represented by eight vectors, and the eight vectors divide a control interval into six sectors. For taking the third (III) sector as an example, the vectors taking actions in Ts in each SVPWM period are allocated sequentially from left to right as 111, 110, 100, 000, 000, 100, 110 and 111, wherein the total acting time of a traditional zero vector is set as T0; the total acting time of a direct-through zero vector is set as t0 which is greater than 0 and less than or equal to T0; and the total acting time t0 of the direct-through zero vector is divided into four sections inserted between the acting times of the traditional zero vector and an adjacent effective vector, thereby realizing SVPWM control of the Z-source inverter. The SVPWM control method is suitable for the SVPWM control of the Z-source inverter.
Owner:HARBIN INST OF TECH
Motor driver and method of controlling the same
ActiveUS8581533B2Increase the carrier frequencyTorque ripple controlCommutation monitoringMotor drivePermanent magnet motor
A controller controls switching of IGBT devices of an inverter according to the desired output of the permanent magnet motor. The controller includes: a magnet temperature detection device that detects the magnet temperature of the permanent magnet motor based on the output of a temperature sensor; a setting device that sets a threshold value of the magnet temperature corresponding to the desired output of the permanent magnet motor, based on a predetermined relation between the output from the permanent magnet motor and a critical temperature, up to which demagnetization in the permanent magnet motor is not caused; and a carrier frequency control device that, when the magnet temperature detected by the magnet temperature detection device exceeds the threshold value, changes the carrier frequency, at which the IGBT devices are switched, such that a ripple current superimposed on a motor current that flows through the permanent magnet motor is reduced.
Owner:DENSO CORP
Carrier phase shifted pulse width modulation type digital power amplifier and power amplification method
PendingCN106160677ASimple structureEasy to expand and maintainAmplifier modifications to reduce non-linear distortionAmplifier with semiconductor-devices/discharge-tubesControl signalPhase difference
The invention discloses a carrier phase shifted pulse width modulation type digital power amplifier and a power amplification method. The digital power amplifier comprises a digital power amplification controller, a drive circuit module, a power amplification main circuit and a filter module; the digital power amplification controller receives externally input analog audio signals and switching signals to digitalize the analog audio signals and performs PWM (pulse width modulation) on the digitized analog audio signals and 2m digital triangular carriers having a sequential phase difference of Pi / m to generate 2m sets of PWM control signals identical in frequency and proportional to input audio amplitude in terms of duty ratio; the power amplification main circuit is connected with the 2m sets of PWM control signals output by the digital power amplification controller via the drive circuit module so as to amplify and synthesize PWM control signal power, high-power analog audio signals are generated via an LC passive low-pass filter to drive a terminal load. The carrier phase shifted pulse width modulation type digital power amplifier and the power amplification method enables effectively improved output power and reliability of digital power amplification and reduced distortion.
Owner:CHANGSHA XIANGJI HAIDUN TECH CO LTD +1
An agile multi-mode multi-channel transceiver based on sdr
The invention discloses an SDR-based agile multi-mode multi-channel transceiver. The SDR-based agile multi-mode multi-channel transceiver includes a host computer, a display unit, a PCI bus data transceiver unit, an FPGA digital signal generation and reception demodulation analysis module, and an agile multi-mode multi-channel transceiver module. Among them, the FPGA digital signal generation and reception demodulation analysis module is used to realize multi-mode and multi-style signal generation and reception demodulation analysis functions, and the agile multi-mode multi-channel transceiver module is used to realize multi-signal mode and multi-communication style signal multi-channel RF transceiver function. The device in the present invention can support wireless communication signal sending and receiving scenarios such as general-purpose software-defined radio applications, MIMO radio, and wireless communication base stations, and has high integration, high consistency, high carrier frequency and bandwidth, multiple signal communication styles, and multiple signal formats. Support multi-input multi-output and other advantages.
Owner:CHINA ELECTRONIS TECH INSTR CO LTD
Laser unified measurement and control method
InactiveCN109639351ABandwidthIncrease the carrier frequencySynchronisation by photonic/optical meansSatellite communication transmissionEngineeringCommunication link
The invention belongs to the field of protection of a new system for spaceflight measurement and control, and relates to a laser unified measurement and control method. High-speed data transmission, remote control and telemetering, distance measurement and speed measurement, and time-frequency transmission are achieved by using a laser link, the laser unified measurement and control method comprises a laser link transmission frame format design for implementing a new measurement and control system, and based on the distance, speed and clock difference measurement of a two-way laser communication link, transmission frame capture and "measurement frame" identification, a "measurement frame" arrival time is accurately measured. Therefore, by adoption of the laser unified measurement and control method provided by the invention, high-speed data transmission, remote control and telemetering, high-precision distance measurement and speed measurement, and time-frequency transmission can be achieved by using two-way laser link integration, the information transmission rate, the measurement rail precision, the time-frequency transmission precision and the anti-interception / anti-interferenceability of a spaceflight measurement and control system can be greatly improved, and the volume, the weight and the power consumption of a satellite borne terminal is greatly reduced, so that the laser unified measurement and control method has a broad application prospect.
Owner:NO 63921 UNIT OF PLA
Double-edge triggering high-speed digital-to-analog converter
ActiveCN101917194AWide signal bandwidthIncrease the carrier frequencyAnalogue-digital convertersDigital analog converterClock rate
The invention relates to a digital-to-analog converter, in particular to a double-edge triggering high-speed digital-to-analog converter, belonging to the field of integrated circuits. The double-edge triggering high-speed digital-to-analog converter comprises a clock circuit, a data multiplexer, a gating unit and a current helm unit. The clock circuit is used for generating clock signals; the data multiplexer is used for converting each path of input data into two paths of complementary data; the gating unit is used for carrying out logic operation on the data generated by the data multiplexer and the clock signals to generate control signals; and the current helm unit has an input end connected with the gating unit and is used for receiving control signals and outputting differential current analog signals. Compared with the traditional single-edge triggering DAC Digital-to-Analog Converter), the double-edge triggering DAC sends out data half an hour before or after the DAC conversion clock so as to convert data twice in a clock period, and can obtain twice effective sampling rate of the traditional single-edge triggering DAC at the same clock rate so as to provide users with wider signal bandwidth or higher carrier frequency.
Owner:苏州云芯微电子科技有限公司
System and method of power line carrier communication
InactiveCN106533506AEasy wiringFast communicationPower distribution line transmissionElectric power transmissionSignal on
The invention provides a system and a method of power line carrier communication. The system for power line carrier communication comprises a sensor, a transmitting device, a receiving device and a microprocessor, wherein the sensor is connected onto the transmitting device for acquiring environmental information and generating sensing signals; the transmitting device is arranged at one end of the power line for loading the sensing signals to the power line in a condition of power transmission by the power line; the receiving device is arranged at the other end of the power line for detecting sensing signals on the power line; and the microprocessor is connected with the receiving device for analyzing and processing the sensing signals. Through the technical scheme of the invention, a signal line needed by sensor communication and the power line can be combined, the signal transmission efficiency can be improved through a carrier frequency adjustment mode, the number of serial communication lines is reduced and the communication speed is enhanced.
Owner:HANDAN MIDEA REFRIGERATION EQUIP
Recovery method of coherent carrier wave and timing of burst mode GMSK
InactiveCN105407067AImprove estimation accuracyPhase Error Accuracy ImprovementMultiple carrier systemsCarrier signalEngineering
The invention discloses a recovery method of a coherent carrier wave and timing of burst mode GMSK. The recovery method comprises alternatively performing forward operation and reverse operation on same GMSK signals in a square loop feedback loop of a receiving machine. The square loop feedback loop comprises a phase error detection module, a loop filter and a numerically controlled oscillator which are successively connected; an output of the numerically controlled oscillator is further connected with the phase error detection module; and the forward operation is operation performed on a GMSK signal flow arranged according to a receiving time sequence, and the reverse operation is operation performed on the GMSK signal flow arranged according to a receiving time inverted sequence. A real value is gradually approached through the forward operation and the reverse operation, which are alternatively performed on limited-length burst packet data, in the method, and then estimation precision of a frequency of a carrier wave and estimation precision of a phase of the carrier wave are improved. The method is used in an AIS receiving machine, can improve recovery performance of a carrier wave and timing of a signal, can improve receiving performance and can simplify structure of the receiving machine.
Owner:WUHAN UNIV
Method and apparatus for searching carrier frequencies
InactiveUS20130315082A1Improve precisionLower complexityError preventionTransmission systemsFrequency bandFrequency interval
A method and apparatus for searching carrier frequencies (CFs) including determining all CFs to be measured within a frequency band according to a predetermined frequency interval; selecting part of the CFs as Sampling Measurement CFs (SMCFs) according to a predetermined band search step, and for each of the SMCFs, calculating initial peak to average ratio (PAR) of the SMCFs; weighting the initial PAR of each of the SMCFs by using initial PARs of SMCFs left and right neighboring each of the SMCFs, to obtain a determined PAR of each of the SMCFs; ordering the determined PARs of all the SMCFs, and selecting, in a descending order of the determined PARs, a predetermined number of SMCFs and frequencies to be measured left and right neighboring the selected SMCFs as a search result.
Owner:FUJITSU LTD
Method and device for generating X-frequency band one-way ranging signals for deep space exploration
ActiveCN104914414AWide frequency rangeSimplify the scaleWave based measurement systemsElectric pulse generator circuitsSidetoneLow-pass filter
The invention provides a method and a device for generating X-frequency band one-way ranging signals for deep space exploration. The method provided by the invention can generate one-way ranging sidetone signals in the X-frequency band. The device provided by the invention comprises simulation devices such as a crystal oscillator, a frequency divider, a low-pass filter, a frequency multiplier, a phase shifter and the like, and turn-off of DOR (Differential One-way Ranging) sidetone signals can be controlled through an instruction. The crystal oscillator generates initial reference signals, one path of the initial reference signals are inputted into the frequency multiplier after power division, the frequency multiplier generates X-frequency band carriers, another path of the initial reference signals are inputted into a divide-by-two frequency divider, a left path of the initial reference signals are inputted into a divide-by-ten frequency divider, and two paths of DOR sidetone signals are generated respectively. Phase modulation is carried out on the two paths of DOR sidetone signals in the X-frequency band, and the two paths of DOR sidetone signals are outputted after being amplified and isolated. Divide-by-two frequency division and divide-by-ten frequency division are completed by a decimal counter. The X-frequency band one-way ranging signals generated by using the method provided by the invention can complete a function of accurate ranging for a deep space probe by being matched with relevant ground station equipment, thereby being applicable to the fields of lunar exploration, Mars exploration and the like.
Owner:SHANGHAI SPACEFLIGHT INST OF TT&C & TELECOMM
Method and apparatus for generating and transmitting WDM MWOF signals
ActiveUS7668463B2Easy to useIncrease the carrier frequencyRadio transmissionOptical multiplexTelecommunicationsWireless data
The present invention includes method and apparatus for converting optical signals to MWOF signals for transmission to wireless data, audio and / or video terminals in the W-band. Advantageously, there is no need to maintain expensive and complex remote stations because a centralized station performs all the complex processing.
Owner:ALCATEL-LUCENT USA INC
Ground user navigation and positioning method based on Beidou Ka inter-satellite link signal
ActiveCN108897027AMake up for usability issuesEnsure navigation safetySatellite radio beaconingNavigation safetyMarine navigation
The invention provides a ground user navigation and positioning method based on a Beidou Ka inter-satellite link signal. The method comprises that it is supposed that between epochs k-1 and k (k=1, 2,3...), a user in an area with a Beidou inter-satellite signal reception terminal in the ground generate inter-satellite link unidirectional range finding values with N different Beidou satellites indifferent time, and N range finding equations are obtained; (2) user positions in the range finding equations are reduced to time Tk in a unified way by using a receiver clock model and inertial navigation information; and (3) on the basis of time synchronization of range finding values, the ground user estimates the positions of himself / herself in real time in a Kalman filtering positioning algorithm. Thus, interference and cheating sources aimed at the L-frequency-band navigation signals can be avoided, possible problems caused by failure of the L-frequency-band navigation signals are solvedto certain extent, and the navigation safety of a key area in the special scene is ensured.
Owner:WENZHOU UNIVERSITY
SVPWM modulation method, device and system
ActiveCN110768605AReduce running timeIncrease the carrier frequencyAC motor controlOvervoltageVoltage vector
The invention provides an SVPWM modulation method, device and system. The SVPWM modulation method comprises the following steps: judging a sector where a voltage vector of a three-phase motor is located by adopting voltages Ualpha_n and Ubeta_n, wherein the voltages Ualpha_n and Ubeta_n are obtained by performing per-unit processing on voltages U<alpha> and U<beta> in a two-phase static coordinatesystem through a bus voltage; judging the action time of each phase of the voltage vector in each sector through the voltage Ualpha_n and the voltage Ubeta_n; and calculating the duty ratio of each phase of the voltage vector in PWM according to the action time of each phase of the voltage vector to obtain a PWM wave for controlling the three-phase motor. According to the SVPWM modulation methodprovided by the invention, the on-time of each phase in the three-phase PWM wave can be directly calculated, there is no need to calculate the on-time Tk and T<k+1> corresponding to two adjacent basicvectors Vk and V<k+1> and the switching time T0 corresponding to a zero vector in the sector region and then carry out time distribution and reconstruction, and therefore, the operation time of the SVPWM algorithm is greatly reduced.
Owner:CHINA FIRST AUTOMOBILE
Bidirectional wireless electromagnetic transmission device and method for well-ground signals of cased well
PendingCN114526064AThe received signal has a large amplitudeIncrease the carrier frequencyConstructionsHigh level techniquesPhysicsCarrier signal
The invention discloses a cased well ground signal bidirectional wireless electromagnetic transmission device and a cased well ground signal bidirectional wireless electromagnetic transmission method, and belongs to the technical field of oil-gas field development. When underground data are uploaded, an upper short section I serves as an electromagnetic signal receiving short section, and a lower short section II serves as an electromagnetic signal transmitting short section; when the TM wave transmitting antenna in the short section II generates an alternating magnetic field in the magnetic core through alternating current, the magnetic core on the short section I of the electromagnetic signal receiving short section can capture the current signal so as to upload the signal; similarly, when ground data is downloaded, the short section II serves as an electromagnetic signal receiving short section, the short section I serves as an electromagnetic signal transmitting short section, and when the TM wave transmitting antenna in the short section I generates an alternating magnetic field in the magnetic core through alternating current, current signals are captured in the short section II to complete signal downloading and bidirectional signal transmission between the short section I and the short section II. Compared with the prior art, under the condition of the same transmission distance, the received signal amplitude is larger, and the carrier frequency is higher.
Owner:SOUTHWEST PETROLEUM UNIV
Double-edge triggering high-speed digital-to-analog converter
ActiveCN101917194BWide signal bandwidthIncrease the carrier frequencyAnalogue-digital convertersDigital analog converterClock rate
The invention relates to a digital-to-analog converter, in particular to a double-edge triggering high-speed digital-to-analog converter, belonging to the field of integrated circuits. The double-edge triggering high-speed digital-to-analog converter comprises a clock circuit, a data multiplexer, a gating unit and a current helm unit. The clock circuit is used for generating clock signals; the data multiplexer is used for converting each path of input data into two paths of complementary data; the gating unit is used for carrying out logic operation on the data generated by the data multiplexer and the clock signals to generate control signals; and the current helm unit has an input end connected with the gating unit and is used for receiving control signals and outputting differential current analog signals. Compared with the traditional single-edge triggering DAC Digital-to-Analog Converter), the double-edge triggering DAC sends out data half an hour before or after the DAC conversion clock so as to convert data twice in a clock period, and can obtain twice effective sampling rate of the traditional single-edge triggering DAC at the same clock rate so as to provide users with wider signal bandwidth or higher carrier frequency.
Owner:苏州云芯微电子科技有限公司
Tunnel leaky cable communication system
ActiveCN112600595AIncrease the carrier frequencyTransmission loss will not increaseParticular environment based servicesRadio transmissionCommunications systemIntermediate frequency
The invention relates to the technical field of mobile communication, and discloses a tunnel leaky cable communication system, i.e., main unit equipment for outputting a multi-channel intermediate frequency modulation signal at an information source part, then the intermediate frequency modulation signal is transmitted by utilizing a leaky cable and is radiated to a space in a tunnel, and the intermediate frequency modulation signal is converted into a multi-channel radio frequency carrier signal at a target working frequency higher than the cut-off frequency of the leaky cable by using vehicle-mounted relay unit equipment arranged on a carriage body of a running train carriage in a tunnel, and the multi-channel radio frequency carrier signal covers the interior of the carriage, so that anovel leaky cable supporting higher cut-off frequency does not need to be redeployed, the deployment cost, the construction cost and the difficulty of a mobile communication signal (especially a 5G signal) leaky cable coverage scheme with relatively high carrier frequency are greatly reduced, and multi-channel communication is supported; and on the other hand, the cooperative base station is adopted to perform system synchronization and equipment management on the vehicle-mounted relay unit equipment, so that the working robustness of the vehicle-mounted relay unit equipment is ensured.
Owner:北京凯博无线科技有限公司
Air conditioner emergency ventilation power supply circuit system
InactiveCN112039337AImplement storageAchieve fixAc-dc conversionDc-dc conversionControl engineeringReal time display
The invention belongs to the field of air conditioner power supply circuits, particularly relates to an air conditioner emergency ventilation power supply circuit system, and solves the problems thatan air conditioner emergency ventilation power supply has no real-time display fault window, is low in adjustability, does not have fault self-diagnosis and self-repair capabilities, is poor in faultstorage and analysis and is low in fan load damping adaptability, and that the output voltage is greatly influenced by the input voltage, the output wind power is unstable and the like. The air conditioner emergency ventilation power supply circuit system comprises a control module, an input module, an output module and a boosting module, the control module comprises a DSP micro control panel andan I / O driving board, and pins are arranged on the I / O driving board and are connected with sensors. A power supply of the invention is convenient for observing the operation condition of the air conditioner emergency ventilation power supply and adjusting the output voltage and frequency, convenient for diagnosing, analyzing, processing and storing faults, and convenient for adapting to change offan load damping and input voltage. The power supply circuit system is suitable for emergency power supply of the train air conditioner emergency ventilation power supply.
Owner:重庆中车四方所科技有限公司
PFC circuit control method and device, computer readable storage medium and controller
ActiveCN112636579ASmall amount of calculationIncrease the carrier frequencyAC motor controlEfficient power electronics conversionCarrier signalInductor
The invention discloses a PFC circuit control method and device, a computer readable storage medium and a controller. The control method comprises the following steps: acquiring an AD sampling value required for controlling the PFC circuit; carrying out reconstruction filtering on the obtained AD sampling value every other at least two carrier periods to obtain a corresponding calculation parameter, and calculating a duty ratio according to the calculation parameter so as to multiplex the duty ratio in the at least two carrier periods; and controlling the PFC circuit according to the multiplexed duty ratio. The duty ratio is calculated every other at least two carrier periods, and the duty ratio is multiplexed, so that the calculated amount of the controller can be effectively reduced, the carrier frequency of the PFC circuit is improved, meanwhile, the controller with high operational capability does not need to be replaced, and the cost is favorably controlled; as the carrier frequency of the PFC circuit is improved, the inductance value and size of the inductor can be further reduced, the power density of the controller is improved, and inductor heating is reduced.
Owner:FOSHAN SHUNDE MIDEA ELECTRONICS TECH CO LTD +1
System and method for positioning information by Internet of Things
PendingCN109737969ARealize positioning information digitizationAvoid mutual interferenceNavigational calculation instrumentsHigh level techniquesElectronic mapInternet of Things
The invention discloses a system and a method for positioning information by the Internet of Things. The system comprises geographic information nodes and a positioning node, wherein the geographic information nodes are distributed in a set area according to a set rule, each geographic information node emits an optical signal with a unique ID (Identity) code to a set direction, and optical signalsemitted by all geographic information nodes do not mutually interfere; the ID code of each geographic information node corresponds to a position coordinate on an electronic map in the set area one byone; and the positioning node matches a position coordinate in the electronic map according to the received ID code. The system has the beneficial effects that the real-time accurate positioning of personnel / equipment / articles in a building can be realized by low cost, and positioning information datamation is realized. The system is cooperated with other intelligent equipment, and beneficial help can be provided for other systems or schemes which need to be positioned in real time.
Owner:孔祥明
Electromagnetic switching-valve position detection system
ActiveCN112105857AImprove responsivenessIncrease the voltage of the carrier componentOperating means/releasing devices for valvesElectric/magnetic position measurementsVoltage amplitudeSignal on
This electromagnetic switching-valve position detection system is provided with: a current control circuit that obtains a smoothed direct current by smoothing a current from a power source via a rectifier bridge diode and a primary-side smoothing capacitor, that transmits the direct current to the secondary side by a switching transformer as an alternating current of pulse waves from a switching element where switching is controlled in accordance with a pulse signal from a pulse signal generation device, and that outputs same as a direct current that has been smoothed via a secondary-side diode and a secondary-side capacitor; a carrier wave generation device for superimposing high-frequency carrier waves for position detection onto signal waves of a current command; and a detection unit for extracting a frequency component of the carrier waves from a voltage feedback signal of a solenoid, and detecting a voltage amplitude thereof to obtain an amplitude signal. A control unit further comprises: a position determination unit for determining a valve spool position on the basis of the amplitude signal and preset criterion reference values corresponding to respective valve spool positions, and outputting a determination signal; and a determination circuit for outputting a valve position signal on the basis of the determination signal.
Owner:YUKEN KOGYO
A tunnel leaky cable communication system
ActiveCN112600595BIncrease the carrier frequencyTransmission loss will not increaseParticular environment based servicesRadio transmissionCommunications systemIntermediate frequency
The invention relates to the technical field of mobile communication, and discloses a tunnel leaky cable communication system, that is, a main unit device that outputs a multi-channel intermediate frequency modulation signal in the source part, and then uses the leaky cable to transmit the intermediate frequency modulation signal and radiates to Space in the tunnel, and then use the vehicle-mounted relay unit equipment placed on the car body of the train running in the tunnel to convert the intermediate frequency modulation signal into a multi-channel radio frequency carrier signal at a target operating frequency higher than the cut-off frequency of the leaky cable, covering To the interior of the carriage, not only does it not need to redeploy new leaky cables that support higher cut-off frequencies, it greatly reduces the deployment cost, construction cost and difficulty of leaky cable coverage solutions for mobile communication signals with higher carrier frequencies (especially 5G signals), and supports Multi-channel communication; on the other hand, the system synchronization and equipment management of the on-board relay unit equipment are carried out by using cooperative base stations, which ensures the robustness of the on-board relay unit equipment.
Owner:北京凯博无线科技有限公司
Ground user navigation and positioning method based on Beidou ka inter-satellite link signal
ActiveCN108897027BMake up for usability issuesEnsure navigation safetySatellite radio beaconingEngineeringNavigation safety
Owner:WENZHOU UNIVERSITY
A kind of svpwm modulation method, device and system
ActiveCN110768605BReduce running timeIncrease the carrier frequencyAC motor controlOvervoltageVoltage vector
The invention provides a SVPWM modulation method, device and system. Wherein the SVPWM modulation method includes the steps: using the voltage U α_n , U β_n Determine the sector where the voltage vector of the three-phase motor is located, in which the voltage U in the two-phase stationary coordinate system is affected by the bus voltage α , U β Perform per unitization to get the voltage U α_n , U β_n ;Through the voltage U α_n , U β_n , determine the action time of each phase of the voltage vector in each sector; calculate the duty cycle of each phase of the voltage vector in PWM according to the action time of each phase of the voltage vector, and obtain the PWM wave for controlling the three-phase motor. The SVPWM modulation method proposed by the present invention can directly calculate the conduction time of each phase in the three-phase PWM wave, without first calculating the conduction time Tk and Tk corresponding to the two adjacent basic vectors Vk and Vk+1 in the sector area. Tk+1 and the switching time T0 corresponding to the zero vector, and then time allocation and reconstruction, greatly reduce the running time of the SVPWM algorithm.
Owner:CHINA FIRST AUTOMOBILE
Broadband LFM Continuous Millimeter Wave Signal Emitter for UAV Line Inspection and Obstacle Avoidance Radar
ActiveCN104062637BReduce phase noiseImprove stabilityRadio wave reradiation/reflectionLow-pass filterFrequency multiplier
Owner:STATE GRID INTELLIGENCE TECH CO LTD
Method for operating brake of motor vehicle, vehicle control device and vehicle
ActiveCN110290987ASimplify the transfer processEasy detectionBrake action initiationsBrake pressureControl equipment
The invention relates to a method for operating a brake of a motor vehicle with at least one electronic brake signal generator, in particular at least one brake pedal, and a brake control device for actuating the brake on the basis of a brake signal of the brake signal generator, wherein the brake signal is transmitted to the brake control device. The method according to the invention is characterised in that the actuation of the brake signal generator and the brake pressure value are transmitted to the brake control device as a brake signal. Finally, the invention relates to a vehicle control device and a vehicle for carrying out the method according to the invention.
Owner:WABCO EURO BVBA SPRL
Method and system for keeping reverse logic channel consistent
InactiveCN101835228AIncrease the carrier frequencyConnection managementAccess networkEmbedded system
The invention discloses a method for keeping a reverse logic channel consistent, comprising the following steps of: transmitting a corresponding relationship of a reverse channel allocated for an AN (Access Network) and the reverse logic channel to a target AN by a source AN when an access terminal (AT) accesses among ANs and allocating a corresponding reverse logic channel for a newly-added reverse channel according to the corresponding relationship of the received reverse channel and the reverse logic channel when the newly-added reverse channel exists in the target AN. The invention also discloses a system for keeping the reverse logic channel consistent, which ensures that information of the reverse logic channel in the target AN keeps consistent with that of the source AN during AN switch, thereby ensuring that the reverse logic channel allocated by the target AN for newly-added reverse channel cannot be conflicted with the allocated reverse logic channel.
Owner:ZTE CORP
A method and device for generating X-band unidirectional ranging signals for deep space exploration
ActiveCN104914414BWide frequency rangeSimplify the scaleWave based measurement systemsElectric pulse generator circuitsLow-pass filterFrequency multiplier
The invention provides a method and a device for generating X-frequency band one-way ranging signals for deep space exploration. The method provided by the invention can generate one-way ranging sidetone signals in the X-frequency band. The device provided by the invention comprises simulation devices such as a crystal oscillator, a frequency divider, a low-pass filter, a frequency multiplier, a phase shifter and the like, and turn-off of DOR (Differential One-way Ranging) sidetone signals can be controlled through an instruction. The crystal oscillator generates initial reference signals, one path of the initial reference signals are inputted into the frequency multiplier after power division, the frequency multiplier generates X-frequency band carriers, another path of the initial reference signals are inputted into a divide-by-two frequency divider, a left path of the initial reference signals are inputted into a divide-by-ten frequency divider, and two paths of DOR sidetone signals are generated respectively. Phase modulation is carried out on the two paths of DOR sidetone signals in the X-frequency band, and the two paths of DOR sidetone signals are outputted after being amplified and isolated. Divide-by-two frequency division and divide-by-ten frequency division are completed by a decimal counter. The X-frequency band one-way ranging signals generated by using the method provided by the invention can complete a function of accurate ranging for a deep space probe by being matched with relevant ground station equipment, thereby being applicable to the fields of lunar exploration, Mars exploration and the like.
Owner:SHANGHAI SPACEFLIGHT INST OF TT&C & TELECOMM
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