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35results about How to "Good anti-interference characteristics" patented technology
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Beacon arranging and image processing method based on UAN (unmanned aerial vehicle) pose calculation
ActiveCN107202982AReduce configuration requirementsSimple methodImage analysisPicture interpretationMachine visionImaging processing
A beacon arranging and image processing method based on UAN (unmanned aerial vehicle) pose calculation comprises the steps as follows: firstly, machine vision guiding landing of an UAN is designed, under the conditions of guarantee of the image sensitivity and analysis of the field distortion, a beacon structure and arranging method required by vision guiding landing is designed according to a built vision imaging system in combination with poses possibly occurring in the landing process, then, three indexes for measuring algorithm applicability are proposed to evaluate and screen pose solution algorithms for different cooperation beacon configurations according to a designed visual guiding system, and finally, adopted ground cooperation beacons are infrared LEDs which have more stable imaging effect, longer imaging distance and higher imaging precision. The method is simple and feasible and has the low landing field configuration requirement, features can be extracted from near infrared images more conveniently and quickly, the application range of the visual system is enlarged, and all-day and all-weather detection and recognition can be realized; the UAN pose information can be solved precisely.
Owner:徐泽宇 +1
Method for detecting underwater dim small target
ActiveCN106682615AGood anti-interference characteristicsAvoid interferenceCharacter and pattern recognitionSignal-to-noise ratio (imaging)Environmental noise
The invention provides a method for detecting an underwater dim small target, and relates to the field of signal processing. A feature layer information fusion method is used to map the feature quantity to the same high-dimensional space to be classified, and detection is carried out through classification results. In the invention, the chaos theory is used to accurately describe and realize the feature extraction of non-linear components in a target signal and the ambient noise to effectively avoid the interference of stochastic components in the ambient noise. By the use of chaotic features in the signal to detect the signal, the minimum detection signal to noise ratio can significantly be reduced and the detection probability can be improved. A stochastic resonance method is used to convert stochastic noise energy into signal energy, the capability to detect dim small targets is improved, and also the non-linear components contained in the signal can also highlighted. The classification method of the fusion center can be used to separate the false alarm, omission and the like in a single node from correct detection results to further improve the detection probability and improve the effectiveness and reliability of the underwater dim small target detection.
Owner:NORTHWESTERN POLYTECHNICAL UNIV
Integrative monitoring system of automobilism action of driver
InactiveCN101643053AGood anti-jamming characteristicsStrong anti-interferenceNavigation instrumentsElectric/fluid circuitDriver/operatorNetworking cables
The invention relates to the research field of the road traffic safety, which discloses an integrative monitoring system of the automobilism action of a driver. The integrative monitoring system comprises a CAN bus, a server, a microwave radar distance measurement module, an infrared laser scanning module, a braking pedal stroke measurement module, a steering wheel turn angle test module, a vehicle motion state measurement module, a driveway identification module, a driver eye motion measurement module and an environmental monitoring module, wherein the server is hung and connected on the CANbus, and the driver eye motion measurement module and the environmental monitoring module are respectively accessed into the server by network lines.
Owner:CHANGAN UNIV
Load shedding control strategy of bypass system of thermal power generating unit in isolated network mode
ActiveCN110318826AImprove control qualityGood anti-interference characteristicsMachines/enginesSafety/regulatory devicesLoad SheddingControl manner
The invention provides a load shedding control strategy of a bypass system of a thermal power generating unit in an isolated network mode. The strategy involves a control mode conversion module, an override feed-forward calculation module and a steam parameter control module, wherein the control mode conversion module is used for monitoring load shedding signals in real time so as to judge the full-load shedding working condition and the part-load shedding working condition and then generating a conversion instruction, wherein the conversion instruction comprises a quick opening instruction, amanual automatic switching instruction and a steam parameter setting instruction; the override feed-forward calculation module is used for calculating the override quick opening amount and the adjusting feed-forward amount of each adjusting loop of a bypass according to the full-load shedding working condition and the part-load shedding working condition; and the steam parameter control module isused for carrying out controlling according to the obtained conversion instruction, the override quick opening amount and the adjusting feed-forward amount. According to the strategy, the problem offast response of load shedding control of the bypass system of the thermal power generating unit in the isolated network mode is solved, and the quality of steam parameter control is improved.
Owner:国网四川综合能源服务有限公司 +1
Generating and compression method for multi-frequency-scan radar signals
InactiveCN103308892ALow probability of interceptImplementation timeRadio wave reradiation/reflectionFrequency spectrumSignal on
The invention discloses a generating and compression method for multi-frequency-scan radar signals. The generating method for the multi-frequency-scan radar signals is provided based on the idea that power density of signals on a time frequency domain is reduced as mush as possible. A single frequency scan signal circumferential displacement and stacking method is utilized to generate time frequency simultaneous multiplex frequency scan signals, the multi-frequency-scan signals are generated, and frequency-scan signals are multiplexed simultaneously in time and frequency in one single pulse time period. The multi-frequency-scan signals of frequency multiplexing are utilized to conduct matched filtering, subsection accumulation is then conducted to obtain distance resolution in negative proportion with bandwidth and signal to noise ratio of a single compressed frequency-scan signal under same energy condition, and secondary compression of the multi-frequency-scan signals is achieved. The signals generated by the methods have high spectrum efficiency and low intercepted probability, and distance resolution and detection distance of the radar are guaranteed.
Owner:WUHAN UNIV
Production Technology of Frequency Conversion Cable Used in Coal Mine
InactiveCN109166677AReasonable structural designStable arrangementCable/conductor manufactureInterference resistanceFrequency conversion
The invention discloses a production process of a frequency conversion cable for a coal mine, comprising the following steps of: determining a cable structure; 2, respectively produce a power core, acontrol core and a filling core, and then forming that cable into a cable core; 3, squeeze that inner sheath out of the cable core; 4, manufacture a shielding layer by an inn sheath; 5, squeeze that outer sheath out of the shield layer. The cable structure of the invention is reasonable in design and stable in arrangement, and the produced cable has excellent anti-interference characteristics, voltage impulse resistance, wear resistance, tear resistance and flame retardancy, and the cable is flexible and easy to bend, and is particularly suitable for use in coal mine roadways with bad conditions.
Owner:FAR EAST CABLE +2
Speed tracking control method for achieving stable flight of airship according to given speed
ActiveCN106774370AFast control responseGood anti-interference characteristicsAttitude controlPosition/course control in three dimensionsResponse effectMathematical model
The invention discloses a speed tracking control method for achieving a stable flight of an airship according to a given speed. The method comprises the steps of generating a forward flight velocity measurement and speed error signal; forming an error-based nonlinear gain entry; measuring a vertical velocity, a pitch angle and a pitch angle rate and building an adaptive term; designing an airship speed tracking control law; approximately simulating the characteristics of an airship pitching channel according to a mathematic model built by the differential equation of the airship pitching channel; and observing data of various states of the airship and drawing a picture by continuously adjusting control parameters, observing a data curve of a transverse flight speed of the airship and analyzing a response effect of constant-speed tracking control, thereby finally determining a group of airship control parameters, and enabling the speed tracking control of the airship to have satisfied dynamic response performance and steady-state response performance.
Owner:YANTAI NANSHAN UNIV +1
Multiscale compressed sensing progressive coding method of ROI (Region of Interest)
ActiveCN104751495AExcellent anti-interference characteristicsReduce lossesImage codingImage compressionDecomposition
The invention relates to a multiscale compressed sensing progressive coding method of an ROI. The method comprises the steps that ROI detection is carried out on an original image; WBCT decomposition is carried out a detected ROI, a transitional zone and a background, multiscale compressed sensing measurement is carried out on the detected ROI, the transitional zone and the background, and ROI advance coding is carried out on the measured values; and if the ROI is not discovered, WBCT decomposition and multiscale compressed sensing measurement are carried out on the original image, and progressive coding is then carried out. According to the method, the image is compressed in the multiscale compressed sensing technology, so that progressive coding of the image is realized; the method is excellent in anti-interference performance due to compressed sensing measurement; and compared with compressed sensing, multiscale compressed sensing can maintain more information including image texture and edges under the same compression ratio.
Owner:SHENYANG INST OF AUTOMATION - CHINESE ACAD OF SCI
Earphone with an antenna
InactiveCN103248975ASimple structureHigh sensitivityEarpiece/earphone attachmentsEngineeringHeadphones
The utility model provides an earphone with an antenna. The earphone comprises a plug, a signal line and earphones. The plug comprises an insulating stand and a plug terminal extending from one side of the insulating stand. The plug terminal at least includes a signal contact and a common contact. The plug terminal is electrically connected to a first signal line which at least comprises an inner core lead composed of a signal line and a grounding line. An outer coating layer with a function of the antenna and a grounding function is disposed at the periphery of the inner core lead. The other end of the first signal line is electrically connected to a switching circuit board with a housing, a second signal line and the earphones. The outer coating layer with the function of the antenna and the grounding function is arranged at the periphery of the inner core lead inside the first signal line, so that the whole earphone with the antenna is simple in structure and high in sensitivity, and exhibits a better anti-interference property.
Owner:HUAGUO ELECTRONICS DONGGUAN
Dielectric array switch
ActiveCN108398736ANot subject to electromagnetic interferenceUnique photonic bandgap propertiesWaveguide type devicesOptical elementsDielectric cylinderElectromagnetic electron wave
The invention belongs to the technical field of electromagnetic switches, and discloses a dielectric array switch. The switch comprises a pedestal, a medium array composed of M*N dielectric cylindersand arranged on the pedestal and heating components arranged at two sides of the dielectric array; the portion among the dielectric cylinders of the dielectric array is filled with a substance with alow melting point and strong liquidity after melting; when the dielectric array switch works, an incident wave is emitted from the direction parallel to the pedestal to heat the filler; when a heatingtemperature reaches the melting point of the filler, the filler is melted, the filler among the dielectric cylinders is environmental gas, so that dielectric constants of cylinder bodies of the dielectric cylinders are changed, transmissivity of the dielectric array switch to a electromagnetic wave of a certain wave band is changed, and the switch functions that the electromagnetic wave is allowed to pass through or is cut off are achieved; the dielectric array switch can prevent external electromagnetic waves from passing through, cannot be affected by external electromagnetic wave interference, and has good anti-interference performance, is applicable to communication wave bands and infrared wave bands, is extremely wide in application wavelength coverage, has significant switch performance, and is high in stability.
Owner:HUAZHONG UNIV OF SCI & TECH
Integrative monitoring system of automobilism action of driver
InactiveCN101643053BGood anti-interference characteristicsWill not affect normal workNavigation instrumentsElectric/fluid circuitLaser scanningEngineering
The invention relates to the research field of the road traffic safety, which discloses an integrative monitoring system of the automobilism action of a driver. The integrative monitoring system comprises a CAN bus, a server, a microwave radar distance measurement module, an infrared laser scanning module, a braking pedal stroke measurement module, a steering wheel turn angle test module, a vehicle motion state measurement module, a driveway identification module, a driver eye motion measurement module and an environmental monitoring module, wherein the server is hung and connected on the CANbus, and the driver eye motion measurement module and the environmental monitoring module are respectively accessed into the server by network lines.
Owner:CHANGAN UNIV
Impeller-type flowmeter flow high-speed sampling sensor
InactiveCN103604471ALow powerLong detection distanceVolume/mass flow by mechanical effectsRAIDImpeller
The invention provides an impeller-type flowmeter flow high-speed sampling sensor to solve the problem that conventional sampling sensors are short in detecting distance, poor in diamagnetism and inaccurate in measuring. The impeller-type flowmeter flow high-speed sampling sensor mainly comprises a high-speed sampling probe and a sensor controller, a coil, a coil support and a protecting support are arranged in the high-speed sampling probe, and the sensor controller comprises a power-source power supply device, a radio wave generating device, a raid wave receiving device, a sampling recognition device, an edge steep pulse generating device, a sampling signal converting device and a sensor signal outputting device. The impeller-type flowmeter flow high-speed sampling sensor is suitable for various impeller-type flowmeters to realize high-speed measuring, and has the advantages of micro power consumption, wide voltage, good temperature characteristic and voltage resistance, excellent output signal and the like; in addition, the impeller-type flowmeter flow high-speed sampling sensor is free of any resistance on an impeller, long in detecting distance, good in resistance to ferromagnetism and accurate in measuring, and different shells can be chosen for different purposes.
Owner:SHANDONG DAMING SHENGKAI IND CO LTD
A beacon layout and image processing method based on UAV pose calculation
ActiveCN107202982BReduce configuration requirementsSimple methodImage analysisPicture interpretationMachine visionImaging processing
A beacon layout and image processing method based on UAV pose calculation. Firstly, the machine vision-guided landing of UAV is designed. According to the built visual imaging system, the image sensitivity is ensured and the field of view distortion is analyzed. Under certain conditions, combined with the possible poses during the landing process, design the beacon structure and layout method required for the vision-guided landing. Then, according to the designed vision-guided system, for different cooperative beacon configurations, three measures are proposed. The index of algorithm applicability is used to evaluate and screen the pose calculation algorithm. Finally, the ground cooperation beacon used is infrared LED. The imaging effect of infrared LED is more stable, the imaging distance is longer, and the imaging accuracy is higher. This method is simple and easy to implement, has low requirements on the configuration of the landing site, is more convenient and faster to extract features from near-infrared images, expands the scope of application of the vision system, and can detect and identify all-weather and all-weather; Machine attitude information.
Owner:徐泽宇 +1
DLP signal receiving system suitable for laser radar and adaptive adjustment method of DLP signal receiving system
ActiveCN107402385AImprove signal-to-noise ratioGood anti-interference characteristicsWave based measurement systemsLaser transmitterSignal-to-noise ratio (imaging)
The invention discloses a DLP signal receiving system suitable for the laser radar and an adaptive adjustment method of the DLP signal receiving system. A laser emitter emits laser signals outwards through a laser scanning mirror, so laser scanning regions are formed. A DLP signal receiver carries out signal acquisition on scanning points of the laser scanning regions, and comprises multiple DLP micro-mirrors arranged in a matrix manner. The laser reflection signal of each scanning point is tracked and received by more than one DLP micro-mirror in the DLP micro-mirrors arranged in the matrix manner. The laser emitter and the DLP signal receiver are arranged in an integrated manner or in a neighboring manner. The DLP micro-mirrors arranged in the matrix manner are used for synchronously tracking and receiving laser reflection signals of the laser radar scanning regions, deflection of the DLP micro-mirror arrays and synchronization of scanning of the laser radar are controlled, and imaging regions of the scanning target reflection signals are selectively projected to a photoelectric sensor, so the signal to noise ratio for increasing the laser reflection signals of the laser radar scanning regions can be increased and better anti-interference characteristics are achieved simultaneously.
Owner:苏州岭纬智能科技有限公司
Digital communication method based on combination of DSSS dispreading operation and LDPC decoding
InactiveCN105429670AGood anti-interference characteristicsStrong error correction abilityError preventionLine-transmissionComputer hardwareData information
The invention discloses a digital communication method based on combination of DSSS spreading operation and LDPC decoding. The method comprises the following steps that S1) a sending end extracts a data frame that needs sending; S2) the sending end codes the extracted data information in an LDPC coding manner; S3) the sending end spreads the spectrum of the coded data in a DSSS manner; S4) the sending end sends data after spectrum spreading to a receiving end via a power line; and S5) the receiving end processes the received data. To enable LDPC decoding to obtain a more accurate initialization probability, reduce the cost, and prevent memory from processing floating points, related operation is carried out on the received DSSS signals via LDPC encoding and local PN codes after 1-bit A / D conversion, a result serves as input of an LDPC decoder without hard decision, and a final result is output via decoding and soft decision. The communication method has the advantages of high DSSS anti-interference feature, high LDPC error correction capability, simple circuits and low cost.
Owner:DALIAN UNIV OF TECH
Ultra-hysteresis dipole transverse wave source
InactiveCN102736102AThe transmission frequency is adjustableReduce volumeSeismic energy generationHysteresisGeotechnics
The invention relates to the field of environmental geotechnics, and particularly relates to an ultra-hysteresis dipole transverse wave source in the field of engineering geophysical logging. The ultra-hysteresis dipole transverse wave source is characterized by comprising an emitter and a receiver, wherein a sound insulation pipe is arranged between the emitter and the receiver; the shell of the emitter and the shell of the receiver are internally respectively provided with two ultra-hysteresis plates which are made of ultra-hysteresis materials and are consistent in direction and identical in specification; and coils which are wound in the opposite direction and has the same turns are arranged on the two ultra-hysteresis plates. The ultra-hysteresis dipole transverse wave source provided by the invention has the advantages of small volume, wide bandwidth, large transmitting power, favorable anti-interference characteristic, favorable signal repeatability, short aftershock, long penetrating distance and the like, and is convenient for installation and suitable for the operation of the transverse wave logging in the field of the environmental geotechnics. The emission frequency of the ultra-hysteresis dipole transverse wave source can be adjusted according to the external voltage.
Owner:WUHAN JIANGHAI TIANDI TECH
A medium array switch
ActiveCN108398736BUnique photonic bandgap propertiesDeny passageWaveguide type devicesOptical elementsInterference resistanceDielectric cylinder
The invention belongs to the technical field of electromagnetic switches, and discloses a dielectric array switch. The switch comprises a pedestal, a medium array composed of M*N dielectric cylindersand arranged on the pedestal and heating components arranged at two sides of the dielectric array; the portion among the dielectric cylinders of the dielectric array is filled with a substance with alow melting point and strong liquidity after melting; when the dielectric array switch works, an incident wave is emitted from the direction parallel to the pedestal to heat the filler; when a heatingtemperature reaches the melting point of the filler, the filler is melted, the filler among the dielectric cylinders is environmental gas, so that dielectric constants of cylinder bodies of the dielectric cylinders are changed, transmissivity of the dielectric array switch to a electromagnetic wave of a certain wave band is changed, and the switch functions that the electromagnetic wave is allowed to pass through or is cut off are achieved; the dielectric array switch can prevent external electromagnetic waves from passing through, cannot be affected by external electromagnetic wave interference, and has good anti-interference performance, is applicable to communication wave bands and infrared wave bands, is extremely wide in application wavelength coverage, has significant switch performance, and is high in stability.
Owner:HUAZHONG UNIV OF SCI & TECH
The Load Shedding Control System of Thermal Power Unit Bypass System in Isolated Grid Mode
ActiveCN110318826BImprove control qualityGood anti-interference characteristicsMachines/enginesSafety/regulatory devicesLoad rejectionLoad Shedding
The present invention provides a thermal power unit bypass system load rejection control system in the isolated grid mode, including: a control mode conversion module, an override feedforward calculation module, and a steam parameter control module; wherein, the control mode conversion module is used for real-time Monitor the load shedding signal to determine the full load shedding and partial load shedding conditions, and generate conversion instructions, including quick opening instructions, manual and automatic switching instructions, and steam parameter setting instructions; the override feedforward calculation module is used to Calculate the overriding quick opening amount and adjustment feedforward amount of each regulating loop in the bypass under load conditions and part load rejection conditions; the steam parameter control module is used to adjust the overriding quick opening amount and adjust the feedforward amount according to the acquired conversion command to control. The invention solves the problem of quick response of the load shedding control of the thermal power unit bypass system in the isolated grid mode, and improves the steam parameter control quality.
Owner:国网四川综合能源服务有限公司 +1
Novel video cable
InactiveCN103296527AImprove connection stabilityImprove ductilityCoaxial cables/analogue cablesRelieving strain on wire connectionYarnCopper wire
The invention relates to the field of communication and discloses a novel video cable which comprises a cable body and a plug. The cable body comprises a cable core, a shielding layer and an outer sheath, an insulating layer is arranged outside the cable core, a reinforcing head is arranged at the joint of the cable body and the plug, the cable core is a stranded object of teflon and copper wires, the shielding layer comprises a thin rubber layer and a copper-coated aluminum and magnesium wire woven mesh, the thin rubber layer is connected with the insulating layer, and a cotton yarn layer is arranged outside the thin rubber layer and connected with the outer sheath through the copper-coated aluminum and magnesium wire woven mesh. By the above mode, various functions of the novel video cable can be optimized, connection firmness of the cable body and the plug can be improved, and wearing and shedding can be prevented; the teflon is tiny in outer diameter, so that saving of raw materials, compression resistance and high temperature resistance can be realized; the thin rubber layer can improve ductility and tenacity, the cotton yarn layer can improve flexibility, and the copper-coated aluminum and magnesium wire woven mesh can improve resistance to low-frequency super-strong electromagnetic interference.
Owner:周国清
An intensity grading system and method based on partial discharge of electrical equipment
ActiveCN109001604BGood anti-interference characteristicsFeatures to avoid interference with real-time detectionTesting using optic methodsData terminalSignal conditioning
The invention proposes an intensity grading system and method based on partial discharge of electrical equipment. The system of the invention includes multiple optical signal transmission units, multiple signal conditioning units, multiple data acquisition cards and data terminals. The method of the present invention utilizes the switchgear to establish a three-dimensional coordinate system, and the length, width and height of the switchgear coincide with the axes of the three-dimensional coordinate system respectively; the collimating mirror probes in a plurality of optical signal transmission units are divided into multiple groups, and placed symmetrically ; through the corresponding optical signal transmission unit, signal conditioning unit and data acquisition card to collect the real-time voltage digital signal converted from partial discharge radiation ultraviolet light and transmit it to the data terminal; the data terminal counts the number of pulses of the real-time voltage digital signal and performs weighting For calculation, the high-voltage partial discharge source is placed inside the switch cabinet and multiple levels of discharge power are set to construct a pulse array matrix, and the intensity classification of partial discharge is established through the pulse array matrix and multiple levels of discharge power.
Owner:HUBEI UNIV OF TECH
Interference-resistant structure of antenna
An interference-resistant structure of a Wlan antenna comprises an antenna cover, a dielectric plate, a planar slot antenna, a feeding microstrip, a metal bottom plate and a feeding connector.
Owner:陈啸
Adaptive adjustment method for dlp signal receiving system suitable for lidar
ActiveCN107402385BImprove signal-to-noise ratioGood anti-interference characteristicsWave based measurement systemsLaser transmitterAnti jamming
Owner:苏州岭纬智能科技有限公司
A Multi-scale Compressive Sensing Progressive Coding Method Based on Region of Interest Priority
ActiveCN104751495BImplement progressive encodingMeet the needs of anti-interferenceImage codingPattern recognitionMultiscale decomposition
The present invention relates to a multi-scale compressive sensing progressive encoding method with priority of interest region, comprising the following steps: performing ROI detection on an original image; performing WBCT decomposition on the detected ROI, transition zone and background respectively and performing multi-scale compressive sensing measurement, Then ROI-priority encoding is performed on each measured value obtained; if no ROI is detected, WBCT decomposition is performed on the original image and multi-scale compressed sensing measurement is performed, and then progressive encoding is performed. The present invention uses multi-scale compressed sensing technology for image compression, which facilitates the realization of image progressive encoding; the use of compressed sensing measurement also makes the method have excellent anti-interference characteristics; under the same compression ratio, multi-scale compressed sensing can achieve more Preserve image texture, edge and other information.
Owner:SHENYANG INST OF AUTOMATION - CHINESE ACAD OF SCI
A Method for Underwater Weak and Small Target Detection
ActiveCN106682615BGood anti-interference characteristicsAvoid interferenceCharacter and pattern recognitionEnvironmental noiseChaos theory
The invention provides a method for detecting underwater weak and small targets, which relates to the field of signal processing, uses the feature layer information fusion method to map the feature quantity into the same high-dimensional space, realizes classification, and detects through the classification results. The invention uses chaos theory Accurately describe and realize the feature extraction of the target signal and nonlinear components in the environmental noise, effectively avoid the interference of random components in the environmental noise, use the chaotic features in the signal for signal detection, which can significantly reduce the minimum detection signal-to-noise ratio and improve the detection probability. The random resonance method converts random noise energy into signal energy, improves the detection ability of weak targets, and can also highlight the nonlinear components contained in the signal. The classification method of the fusion center can eliminate false alarms and missed detections in a single node. etc. are separated from the correct detection results to further increase the detection probability and improve the effectiveness and reliability of weak and small target detection at sea.
Owner:NORTHWESTERN POLYTECHNICAL UNIV
Digital three-component wave speed probe
InactiveCN101672926BImprove anti-interference abilityLarge test depthSeismic signal receiversSeismic signal transmissionSignal conditioning circuitsEngineering
The invention relates to a digital three-component wave speed probe which comprises a shell, a sensor core, an electromagnetic mechanism and an elastic arm, wherein the elastic arm is matched with the electromagnetic mechanism and is connected with the shell, and the sensor core and the electromagnetic mechanism are arranged in the shell. The invention is also characterized in that a circuit module is also arranged in the shell; the circuit module comprises a power supply circuit, a central processing controller, a signal acquisition circuit and a digital signal transmission circuit; the signal acquisition circuit and the digital signal transmission circuit are respectively connected with the central processing controller; the signal acquisition circuit comprises a signal acquisition interface; the digital signal transmission circuit is provided with a signal transmission interface and a communication port connected with the central processing controller; the signal acquisition circuit comprises an acquisition channel for acquiring vibration signals; and a signal modulating circuit transmits the vibration signals which are converted into digital signals to a signal receiving end of a ground instrument.
Owner:武汉鑫宏泰液压科技有限公司
Underground man-vehicle positioning system based on LoRa technology
InactiveCN112218244AGood anti-interference characteristicsSystem miss rate reductionLocation information based serviceShort range communication serviceEmbedded systemReal-time computing
The invention discloses an underground human-vehicle positioning system based on a LoRa technology. The underground human-vehicle positioning system comprises a server, a positioning base station, a personnel positioning card carried by personnel, and a vehicle positioning card placed on a vehicle, wherein the server is connected with the positioning base stations through the Ethernet, and the positioning base stations are connected with the personnel positioning cards and the vehicle positioning cards through LoRa signals. The LoRa technology relied on by the invention has a good anti-interference characteristic, the missed reading rate of the system is greatly reduced, and the system also has the advantages of wide coverage, low power consumption and the like.
Owner:SANSHANDAO GOLD MINE SHANDONG GOLD MINING LAIZHOU
A miniaturized multi-service wireless mobile ad hoc network system
ActiveCN106535207BImprove bandwidth utilizationGuaranteed reliabilityNetwork topologiesNetwork planningHigh rateData information
The invention provides a miniaturized multiservice wireless mobile ad hoc network system. A physical layer comprises a DSSS module and an OFDM module, wherein the OFDM module provides an OFDM protocol for transmitting service data information with a higher rate requirement, the DSSS module provides a DSSS protocol for transmitting network maintenance and control information of each node and service data information with a lower rate requirement. A link layer employs a TDMA mode to segment time into periodic frames and then segments the frames into DSSS fixation time slot portions, DSSS dynamic time slot portions and OFDM dynamic time slot portions. A network layer provides a multipath route protocol for transmitting all information, employs an active route mode to maintain one-hop neighbor nodes and employs an on-demand route mode to maintain neighbor nodes of more than one hop. The wireless mobile ad hoc network system can simultaneously satisfy a miniaturization transmission requirement and a multiservice transmission requirement.
Owner:SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI +1
Magnetic molecularly imprinted electrochemical sensor and preparation method and application thereof
PendingCN113970581AGood specificityGood anti-interference characteristicsMaterial electrochemical variablesMolecularly imprinted polymerParaffin oils
The invention discloses a magnetic molecularly imprinted electrochemical sensor and a preparation method and application thereof. The preparation method of the magnetic molecularly imprinted electrochemical sensor comprises the following steps of: S1, fully grinding carbon powder, paraffin oil and a methotrexate magnetic molecularly imprinted polymer to obtain homogeneous magnetic molecularly imprinted carbon paste powder; S2, filling a carbon paste electrode with the magnetic molecularly imprinted carbon paste powder prepared in the step S1 as a filler, and polishing the surface of the electrode on smooth weighing paper to obtain a magnetic molecularly imprinted carbon paste electrode; and S3, preparing a magnetic molecularly imprinted electrochemical sensor by taking the magnetic molecularly imprinted carbon paste electrode prepared in the step S2 as a working electrode. The electrochemical sensor prepared by utilizing the preparation method disclosed by the invention has better specific recognition on methotrexate, and also has better anti-interference characteristic on structural analogues of methotrexate, such as trimethoprim, metsulfuron-methyl and folic acid.
Owner:THE AFFILIATED HOSPITAL OF QINGDAO UNIV
A Tag Antenna Solving the Interference Problem of Dense Placement
ActiveCN109086855BGood anti-interference characteristicsImprove universalityRecord carriers used with machinesTag antennaEngineering
Owner:BEIJING INST OF COMP TECH & APPL
A speed tracking control method to realize the airship's stable flight at a given speed
ActiveCN106774370BFast control responseGood anti-interference characteristicsAttitude controlPosition/course control in three dimensionsResponse effectMathematical model
The invention discloses a speed tracking control method for achieving a stable flight of an airship according to a given speed. The method comprises the steps of generating a forward flight velocity measurement and speed error signal; forming an error-based nonlinear gain entry; measuring a vertical velocity, a pitch angle and a pitch angle rate and building an adaptive term; designing an airship speed tracking control law; approximately simulating the characteristics of an airship pitching channel according to a mathematic model built by the differential equation of the airship pitching channel; and observing data of various states of the airship and drawing a picture by continuously adjusting control parameters, observing a data curve of a transverse flight speed of the airship and analyzing a response effect of constant-speed tracking control, thereby finally determining a group of airship control parameters, and enabling the speed tracking control of the airship to have satisfied dynamic response performance and steady-state response performance.
Owner:YANTAI NANSHAN UNIV +1
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