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32results about How to "Improve sensitivity performance" patented technology
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Coherent optical receiver system and method for detecting phase modulated signals
InactiveUS20110150504A1Avoiding complex and high speedImprove sensitivity performanceElectromagnetic receiversCarrier signalPhase-shift keying
One aspect of the invention is a homodyne coherent receiver, suitable for high speed phase shift keying (PSK), the receiver comprising a receiver for receiving an incoming signal having a carrier-less modulation format, a signal conditioning sub-system that generates a carrier component from the incoming signal, and an optical injection phase locked loop (OIPLL) that phase locks the generated carrier component of the incoming signal. Embodiments of the invention may enable DSP free detection of optical PSK signals, which may be required in next generation fiber transmission systems and in optical constellation analyzer systems. In addition, embodiments of the invention may provide improved receiver sensitivity performance comparing to prior art systems using direct detection schemes. Also, embodiments of the invention may be advantageous in terms of cost and energy efficiency.
Owner:UNIV COLLEGE CORK NAT UNIV OF IRELAND CORK
Method for fabricating novel high-performance field-effect transistor biosensor based on conductive polymer nanomaterials functionalized with anti-VEGF adapter
ActiveUS8138005B2Improve performanceImprove sensitivity performanceNanotechMaterial analysis by electric/magnetic meansTransistor arrayAptamer
Disclosed is a method for fabricating a high-performance field-effect transistor biosensor for diagnosing cancers using micro conductive polymer nanomaterials funtionalized with anti-VEGF aptamer. Disclosed is a high-sensitivity field-effect transistor biosensor for diagnosing cancers using a micro conductive polymer nanomaterial transistor array including a micro polymer nanomaterial transistor array including a channel region provided with a metal source electrode, a metal drain electrode, a gate and micro polymer nanomaterials, and an anti-VEGF aptamer covalently bound to the surface of the micro polymer nanomaterials constituting the channel region of the micro polymer nanomaterials transistor array, to target VEGF (Vascular endothelial growth factor).
Owner:SEOUL NAT UNIV R&DB FOUND
GNSS signal capturing and tracking method and system based on dual-polarized antenna
The invention discloses a GNSS signal capturing and tracking method and system based on a dual-polarized antenna. The GNSS signal capturing method comprises the steps of receiving RHCP signals and LHCP signals through the RHCP antenna part and the LHCP antenna part respectively, capturing satellite signals based on the RHCP signals, extracting the serial numbers of non-captured satellites, prolonging the integral time, capturing signals of the non-captured satellites based on the RHCP signals and the LHCP signals, and capturing the signals of the same satellite or the signals of the different satellites respectively and synchronously based on the RHCP signals and the LHCP signals respectively. According to the GNSS signal capturing and tracking method and system based on the dual-polarized antenna, the direct signals and the echoed signals are synchronously received, and the satellite signals are processed and positioning is carried out based on the direct signals and the echoed signals. By adopting the GNSS signal capturing and tracking method and system based on the dual-polarized antenna, under the conditions of serious multi-path fading and poor signal environments, the sensitivity of a GNSS receiver can be improved under weak signal environments and complex signal environments such as cities and rooms.
Owner:WUHAN UNIV
Energetic type metal-organic framework material and preparation method thereof
InactiveCN104211736AIncrease energy densityConcentrated release of energyCobalt organic compoundsRoom temperatureCoordination complex
The invention discloses an energetic type metal-organic framework material and a preparation method thereof. The complex consists of five metal ions Co(II), four 2,2'- binitro-4, 4'-biphenyldicarboxylic acid ligands, six coordinated water, two hydroxyls and sixteen crystal water. The preparation method for the energetic type metal-organic framework material comprises the following steps: adding the ligands into H2O, regulating the pH by use of LiOH, then, adding Co(NO3)2.6H2O, sufficiently stirring, placing into a stainless steel reaction kettle with a polytetrafluoroethylene lining; heating the stainless steel reaction kettle to 150 DEG C in a programmed manner and keeping the temperature for 48 hours, cooling the stainless steel reaction kettle to the room temperature in the programmed manner, leaving purple pink cubic crystal particles on the lining wall, filtering, washing and drying in the air to obtain the complex. The brisance and the work capability of the energetic material prepared by the preparation method are improved.
Owner:INNER MONGOLIA UNIV OF TECH
Method for measuring 9-hydroxy fluorine based on electrochemistry hairpin DNA biosensor
InactiveCN102680549AHigh affinityHighly ordered structureMaterial electrochemical variablesSulfurImmobilized DNA
The invention belongs to the technical field of electrochemistry detection and chemical sensors for detecting 9-hydroxy fluorine based on a hairpin DNA modified gold electrode sensor, and relates to preparation of a hairpin DNA modified gold electrode capble of having electrochemical response to 9-hydroxy fluorine and detection on the 9-hydroxy fluorine with the electrode. Specifically, the synthetic sulfhydryl modified hairpin DNA is used as a raw material, the hairpin DNA is self-assembled to the surface of the gold electrode by the Au-S bond interaction to prepare the DNA modified electrode. The immobilized DNA electrode has high response to the 9-hydroxy fluorine, and the detection on the 9-hydroxy fluorine can be carried out according to the change of response of the electrochemistry to the impedance. The DNA sensor has the advantages of mild preparation condition, simplicity in operation, good stability and high sensitivity.
Owner:BEIJING NORMAL UNIVERSITY
Speaker module
ActiveUS20170303033A1Improve sensitivity performanceSimple structureLoudspeaker transducer fixingCircuit lead arrangements/reliefLoudspeakerEngineering
A speaker module comprising a module housing is disclosed. A speaker unit is accommodated within the module housing. A sound hole of the module is located at a side of the speaker unit. The speaker unit divides a cavity of the entire module into two cavities, namely a front acoustic cavity and a rear acoustic cavity. The front acoustic cavity is in communication with the sound hole. A sound-absorbing cotton is provided in the front acoustic cavity. The sound-absorbing cotton is fixed on the module housing, and is arranged to avoid a vibration space of a diaphragm of the speaker unit. The present invention effectively improves the performance of a sensitivity curve of the module at high frequencies without modifying the structure of the front acoustic cavity, thus not only increasing the acoustic performance of the module, but also simplifying the structure of the front acoustic cavity of the module.
Owner:GOERTEK INC
Active matching thickness mould pressing electropneumatic coupling ultrasonic transducer
InactiveCN106311584AImprove sensitivity performanceMechanical vibrations separationSheet structureUltrasound
The invention provides an active matching thickness mould pressing electropneumatic coupling ultrasonic transducer. The active matching thickness mould pressing electropneumatic coupling ultrasonic transducer comprises a piezoelectric plate (1), a first matching layer (2), a second matching layer (3), a transducer shell (4), a first joint (5) and a second joint (6); the piezoelectric plate (1), the first matching layer (2) and the second matching layer (3) are sequentially arranged in the transducer shell (4) in the emission direction of ultrasonic signals, the first matching layer (2) is of a round sheet structure made of microhole foaming materials, the second matching layer (3) is of a round sheet structure made of a polarization multi-hole PVDF thin film, the second matching layer (3) is communicated with the second joint (6) through a wire, and the diameter of the first matching layer (2) and the diameter of the second matching layer (3) are the same with that of the piezoelectric plate (1). According to the transducer, an active matching layer material is introduced, transmission sound waves can be actively amplified, and the sensitivity can be improved.
Owner:INST OF ACOUSTICS CHINESE ACAD OF SCI
Method for fabricating novel high-performance field-effect transistor biosensor based on conductive polymer nanomaterials functionalized with Anti-vegf adapter
ActiveUS20110237012A1Reduce trafficReduce formation of holeNanotechMaterial analysis by electric/magnetic meansAptamerTransistor array
Disclosed is a method for fabricating a high-performance field-effect transistor biosensor for diagnosing cancers using micro conductive polymer nanomaterials funtionalized with anti-VEGF aptamer. Disclosed is a high-sensitivity field-effect transistor biosensor for diagnosing cancers using a micro conductive polymer nanomaterial transistor array including a micro polymer nanomaterial transistor array including a channel region provided with a metal source electrode, a metal drain electrode, a gate and micro polymer nanomaterials, and an anti-VEGF aptamer covalently bound to the surface of the micro polymer nanomaterials constituting the channel region of the micro polymer nanomaterials transistor array, to target VEGF (Vascular endothelial growth factor).
Owner:SEOUL NAT UNIV R&DB FOUND
Method and device for eliminating harmonic interference
ActiveCN107222226ASolve the problem of convergenceSolve the problem of needing to wait for parameters to convergeTransmissionHarmonic phaseHarmonic interference
The invention provides a method for eliminating harmonic interference. The comprises the steps of determining a harmonic shifting amount which is a difference between a harmonic interference frequency point and a central frequency point of a receiving signal; determining the harmonic amplitude and the harmonic phase of a harmonic interference signal included in the receiving signal according to the receiving signal and the harmonic shifting amount; determining the harmonic interference signal according to the harmonic amplitude and the harmonic phase; and subtracting the harmonic interference signal from the receiving signal, thus eliminating the harmonic interference signal in the receiving signal. Therefore, according to the method provided by the invention, interference to the receiving signal caused by the harmonic signal is effectively solved, and the sensitivity performance of a receiver is improved, so that the performance of the receiver is not influenced by the strength of the harmonic signal, and the receiver has high robustness.
Owner:HUAWEI TECH CO LTD
Method for detecting 1,8-diaminonaphthalene based on electrochemical DNA biosensor
InactiveCN102692435AIncreased sensitivityImprove stabilityMaterial electrochemical variablesElectrochemical responseSulfur
Disclosed is a method for detecting 1,8-diaminonaphthalene based on an electrochemical DNA biosensor. The invention belongs to the technical field of electrochemical detection and chemical sensors for detecting 1,8-diaminonaphthalene based on a gold electrode modified by hairpin DNA, and relates to preparation of the gold electrode modified by hairpin DNA which has an electrochemical response to the 1,8-diaminonaphthalene and detection of the 1,8-diaminonaphthalene by adopting the electrode. Specifically, the preparation of the gold electrode comprises using hairpin DNA modified by dithio as a raw material, and self-assembling on the gold electrode surface through the action of gold-sulfur bonds to prepare the electrode modified by the hairpin DNA. Changes in impedance of a DNA film are caused by interaction between the electrode modified by the hairpin DNA and the 1,8-diaminonaphthalene, and detection of 1,8-diaminonaphthalene can be carried out according to responded changes in the impedance. A method for preparing the DNA biosensor of the invention has the advantages of mild conditions, simplicity and convenience, good stability, high sensitivity and simple operation.
Owner:BEIJING NORMAL UNIVERSITY
Radio frequency system, antenna switching method and client front-end equipment
ActiveCN112468178AReduce the number of switching stagesImprove communication performanceTransmissionHigh level techniquesTransceiverRadio frequency signal
The invention relates to a radio frequency system, an antenna switching method and client front-end equipment, and the radio frequency system comprises a receiving module which is used for receiving and processing a radio frequency signal; M antennas, wherein each antenna of the M antennas and the receiving module are connected with the radio frequency transceiver, the M antennas are configured with M ports, and the M antennas are connected with the M ports in a one-to-one correspondence manner through the receiving module to form a preset receiving transmission path of each antenna; configuration information of a preset receiving transmission path is stored in the radio frequency transceiver, the radio frequency transceiver is further used for determining a target transceiving antenna group according to the radio frequency signal received by each port, the target transceiving antenna group comprises N antennas, wherein N is greater than or equal to 2 and less than M. According to theinvention, the insertion loss of a radio frequency front-end circuit in a radio frequency system can be reduced, the sensitivity performance is improved, and the communication performance of the radiofrequency system is further improved.
Owner:GUANGDONG OPPO MOBILE TELECOMM CORP LTD
Fluorescent probe for monitoring apoptosis as well as preparation method and application of fluorescent probe
ActiveCN111793673AImprove sensitivity performanceImprove stabilityCompound screeningApoptosis detectionBiophysicsFluoProbes
The invention discloses a fluorescent probe for monitoring apoptosis as well as a preparation method and application of the fluorescent probe. The fluorescent probe comprises a DNA tetrahedral nucleicacid framework nanostructure with three probe binding arms, a Cy3-modified DNA single chain as a positioning probe, a cytochrome c probe and a telomerase probe, the positioning probe, the cytochromec probe and the telomerase probe are combined with three probe combination arms of the DNA tetrahedron nucleic acid framework nano structure through nucleic acid complementary hybridization, the cytochrome c probe comprises a cytochrome c aptamer chain and a hybrid double chain of a cytochrome c capture chain, and the telomerase probe comprises a telomerase capture chain, a telomerase template chain and a hybrid double chain of a telomerase dye chain. The DNA tetrahedron nucleic acid framework type cell apoptosis whole-process monitoring fluorescence probe has the characteristics of high sensitivity, good stability, strong selectivity and low toxicity, and shows good application performance in the aspects of cell apoptosis monitoring, drug evaluation and screening and the like.
Owner:NANJING UNIV OF POSTS & TELECOMM
Wireless communication method and apparatus
ActiveCN108023850AImprove sensitivity performanceLower latencyMulti-frequency code systemsDigital feedbackData stream
The invention, which is applicable to the field of the communication technology, provides a wireless communication method and apparatus. The method comprises: a to-be-modulated data bit stream is modulated at a transmitting terminal to obtain a first complex signal corresponding to the data bit stream, a pseudo-random sequence is generated based on the data bit stream, and the pseudo-random sequence is modulated to obtain a second complex signal corresponding to the pseudo-random sequence; the first complex signal and the second complex signal are combined to form a physical frame; and then the physical frame is processed to obtain an analog signal and the analog signal is transmitted to a receiving terminal. The structure of the physical frame is simplified, so that the data redundancy ofthe data stream in the modulation process is reduced. The second complex signal is determined at the receiving terminal by a quick synchronous capturing method, digital feedback loop carrier recoveryis carried out on the first complex signal, and then channel error correction and decoding are carried out to obtain a demodulated data bit stream, so that the receiving and processing delay costs are lowered and the data throughput rate of the system and the flexibility of the data receiving are improved effectively.
Owner:SHENZHEN RENERGY TECH
Actinic ray-sensitive or radiation-sensitive resin composition, actinic ray-sensitive or radiation-sensitive film, mask blank including actinic ray-sensitive or radiation-sensitive film, pattern forming method, and method for manufacturing electronic device
ActiveUS20170351176A1Excellent collapse performanceHigh resolution performancePhotomechanical coating apparatusPhotomechanical exposure apparatusActinic RaysHydroxy group
Provided are an actinic ray-sensitive or radiation-sensitive resin composition including a compound (A) whose dissolution rate in an alkali developer decreases by the action of an acid, a resin (B) having a group that decomposes by the action of an alkali developer to increase the solubility in the alkali developer and having at least one of a fluorine atom or a silicon atom, and a resin (C) having a phenolic hydroxyl group, different from the resin (B), an actinic ray-sensitive or radiation-sensitive film and a mask blank, each formed using the actinic ray-sensitive or radiation-sensitive resin composition, a pattern forming method using the actinic ray-sensitive or radiation-sensitive resin composition, and a method for manufacturing an electronic device.
Owner:FUJIFILM CORP
Imaging members with ionic multifunctional epoxy compounds
InactiveUS6841335B2Improved background sensitivity performanceReduce fillingRadiation applicationsSemiconductor/solid-state device manufacturingIonPhenyl group
An imaging member, such as a negative-working printing plate or on-press cylinder, can be prepared using a hydrophilic imaging layer comprising a hydrophilic heat-sensitive polymer containing a crosslinking agent comprising ionic groups and epoxy groups. This polymer may comprise quaternary ammonium carboxylate groups which may include at least one substituted-alkylene(C1-C3)-phenyl group. The imaging member also includes an infrared radiation sensitive material to provide added sensitivity to heat that can be supplied by laser irradiation in the IR region. The heat-sensitive polymer may be “switchable” in response to heat, and provides a lithographic image without wet processing.
Owner:KODAK POLYCHROME GRAPHICS
Speaker module
ActiveUS10158937B2High sensitivityImprove performanceLoudspeaker transducer fixingCircuit lead arrangements/reliefEngineeringLoudspeaker
A speaker module comprising a module housing is disclosed. A speaker unit is accommodated within the module housing. A sound hole of the module is located at a side of the speaker unit. The speaker unit divides a cavity of the entire module into two cavities, namely a front acoustic cavity and a rear acoustic cavity. The front acoustic cavity is in communication with the sound hole. A sound-absorbing cotton is provided in the front acoustic cavity. The sound-absorbing cotton is fixed on the module housing, and is arranged to avoid a vibration space of a diaphragm of the speaker unit. The present invention effectively improves the performance of a sensitivity curve of the module at high frequencies without modifying the structure of the front acoustic cavity, thus not only increasing the acoustic performance of the module, but also simplifying the structure of the front acoustic cavity of the module.
Owner:GOERTEK INC
Zinc-aluminum ion recognition fluorescent probe as well as preparation method and application thereof
ActiveCN113402417AImprove sensitivity performanceStrong specificityHydrazide preparationHydrazone preparationProstate cancerOncology
The invention provides a zinc-aluminum ion recognition fluorescent probe as well as a preparation method and application thereof. The molecule of the fluorescent probe contains a Schiff base structure and three benzyl groups. The zinc-aluminum ion fluorescent probe provided by the invention has the characteristics of double mechanisms, double response, high sensitivity, high specificity, no influence of other metal ions, easiness in cellular uptake, low cytotoxicity and the like. The probe is applied to peripheral blood of a prostate cancer patient, the zinc content in serum can be quantitatively detected, and valuable information is provided for diagnosis of a suspected prostate cancer patient. The probe is combined with prostate cancer serum PSA detection, so that the diagnosis accuracy of prostate cancer can be effectively improved, puncture diagnosis requirements of patients with serum PSA in a gray range are avoided, and excessive diagnosis and excessive treatment are avoided.
Owner:RUIJIN HOSPITAL AFFILIATED TO SHANGHAI JIAO TONG UNIV SCHOOL OF MEDICINE
Method and device for eliminating harmonic interference
ActiveCN107222226BAvoid interferenceImprove sensitivity performanceTransmissionHarmonic phaseHarmonic interference
The invention provides a method for eliminating harmonic interference. The comprises the steps of determining a harmonic shifting amount which is a difference between a harmonic interference frequency point and a central frequency point of a receiving signal; determining the harmonic amplitude and the harmonic phase of a harmonic interference signal included in the receiving signal according to the receiving signal and the harmonic shifting amount; determining the harmonic interference signal according to the harmonic amplitude and the harmonic phase; and subtracting the harmonic interference signal from the receiving signal, thus eliminating the harmonic interference signal in the receiving signal. Therefore, according to the method provided by the invention, interference to the receiving signal caused by the harmonic signal is effectively solved, and the sensitivity performance of a receiver is improved, so that the performance of the receiver is not influenced by the strength of the harmonic signal, and the receiver has high robustness.
Owner:HUAWEI TECH CO LTD
RFID high frequency antenna based on transparent flexible substrate and preparation process thereof
ActiveCN110808448AReduce line widthGuaranteed long-range identification characteristicsAntenna supports/mountingsRadiating elements structural formsEtchingHemt circuits
The invention discloses an RFID high frequency antenna based on a transparent flexible substrate and a preparation process thereof, belongs to the technical field of electronic labels, and solves theproblems of low transparency, poor directional radiation, complex process and low product quality of the RFID antenna in the prior art. The RFID high frequency antenna comprises an insulating transparent substrate layer and an antenna radiation structure. The antenna radiation structure is arranged on the surface of the substrate layer. The antenna radiation structure comprises a conductive pattern unit, a circuit connection unit and a positioning arm. The conductive pattern unit comprises a first substructure, a second substructure and a third substructure. The line width of the conductive pattern unit is small and the antenna is enabled to be transparent as a whole by cooperating with the transparent flexible substrate. The end partss of the first substructure and the second substructureare disconnected to realize directional radiation and reduce mutual coupling interference. The antenna is prepared by using the unique way of connecting the conductive pattern unit and the circuit connecting unit in the same plane and combining the processes of single-side printing and single-side etching so that the antenna preparation is simplified and the material consumption is reduced.
Owner:元彰精密科技(扬州)有限公司
A combination of biomarkers for diagnosing of diabetic retinopathy and use thereof
PendingUS20220146531A1Improve diagnostic performanceImprove sensitivity performanceMicrobiological testing/measurementDisease diagnosisDiabetic retinopathyClinical information
The present invention relates to a combination of biomarkers for diagnosing diabetic retinopathy and a use thereof, and more specifically to a combination of biomarkers for diagnosing diabetic retinopathy which is composed of two or more blood biomarkers specific for the diagnosis of diabetic retinopathy with increased diagnostic performance. In addition, the present invention relates to a composition for diagnosing diabetic retinopathy, a diagnostic kit and a method for providing information necessary for the diagnosis of diabetic retinopathy, using the combination of biomarkers. The combination of biomarkers for diagnosing diabetic retinopathy according to the present invention was confirmed to exhibit excellent sensitivity and diagnostic performance compared to other biomarker combinations, and it was also confirmed to exhibit high diagnostic capacity in early diabetic retinopathy when the protein quantitative values of the combination of biomarkers and the basic clinical information were combined and analyzed.
Owner:RETI MARK CO LTD
A kind of RFID high-frequency antenna based on transparent flexible substrate and its preparation process
ActiveCN110808448BReduce line widthGuaranteed long-range identification characteristicsAntenna supports/mountingsRadiating elements structural formsEtchingElectronic tagging
The invention discloses an RFID high-frequency antenna based on a transparent flexible substrate and a preparation process, which belongs to the technical field of electronic tags, and solves the problems of low transparency, poor directional radiation, complicated process and low product quality of the RFID antenna in the prior art. It includes an insulating transparent substrate layer and an antenna radiation structure. The antenna radiation structure is arranged on the surface of the substrate layer. The antenna radiation structure includes a conductive pattern unit, a circuit connection unit and a positioning arm. The conductive pattern unit includes a first substructure, a second substructure and third substructure. In the present invention, the line width of the conductive pattern unit is small, and the transparent and soft base material is used to make the antenna transparent as a whole. The ends of the first substructure and the second substructure are disconnected to realize directional radiation and reduce mutual coupling interference. The unique way of connecting with the circuit connection unit on the same plane, combined with the single-side printing and single-side etching process to prepare the antenna, simplifies the preparation of the antenna and reduces the material consumption.
Owner:元彰精密科技(扬州)有限公司
Preparation method of small fragment bmg antibody and β2-microglobulin detection kit
ActiveCN106324251BImprove stabilityStrong specificityColor/spectral properties measurementsBiological testingAntigenSmall fragment
The invention provides a preparation method of a small-fragment BMG antibody and a high-sensitivity beta2-microglobulin detection kit comprising the antibody. The kit is composed of three parts, namely a reagent R1, a reagent R2 and a calibrator, wherein the reagent R1 is a phosphate buffer system which contains a protein dissociation agent, the reagent R2 is a buffer solution which contains a certain quantity of latex particles coated with the small-fragment BMG antibody, and the calibrator is mainly a bovine serum matrix. By the adoption of the protein dissociation agent, an antigen site in a sample is exposed to the maximum extent, and the combination rate of an antigen and the antibody is increased; the latex particles which are more stable and ideal in signal amplification effect are coated with the special small-fragment BMG antibody; by the two means, high sensitivity of the kit is realized; the problems that BMG reagents on the current market are not high in sensitivity, high in price and the like are solved.
Owner:上海睿康生物科技有限公司
RF system, antenna switching method and customer premises equipment
ActiveCN112468178BReduce the number of switching stagesImprove communication performanceTransmissionHigh level techniquesTransceiverRadio frequency signal
The present application relates to a radio frequency system, an antenna switching method, and a customer front-end device. The radio frequency system includes a receiving module for receiving and processing radio frequency signals; each antenna of M antennas is connected to the receiving module with a radio frequency transceiver, which is configured with M radio frequency transceivers. The M antennas are connected to the M ports through the receiving module in a one-to-one correspondence to form a preset receiving and transmission path of each antenna; wherein, the radio frequency transceiver stores the configuration information of the preset receiving and transmission path, and is also used for according to each The RF signal received by the port determines the target transceiver antenna group. The target transceiver antenna group includes N antennas, where 2≤N<M; it can reduce the insertion loss of the RF front-end circuit in the RF system, improve the sensitivity performance, and further improve the RF system communication performance.
Owner:GUANGDONG OPPO MOBILE TELECOMM CORP LTD
Definite-time detection method for frame synchronization of TETRA base station baseband receiver
ActiveCN101820312BReduce the probability of false synchronizationAccurate detectionTransmitter/receiver shaping networksBaseband receiverDefinite time
The invention provides a definite-time detection method for the frame synchronization of a TETRA base station baseband receiver, which can overcome the degradation of the receiving performance of the base station as a result of false synchronization. In the invention, the frame synchronization detection is carried out in a frame synchronization time window, and the definite-time detection method comprises the following steps: providing two sub-time slot burst synchronization time windows in a time slot burst, and respectively detecting two normal training sequences orderly in the two sub-timeslot burst synchronization time windows. The invention presets the frame synchronization time window based on the characteristic of the TDMA bust structure, thereby greatly reducing the false synchronization probability of the frame synchronization. The invention sets the two synchronization time windows corresponding to the normal uplink burst and the control uplink burst in the definite-time flow based on the characteristic of the TETRA uplink burst, and different synchronization time window signals can enable the frame synchronization detector to accurately detect the corresponding training sequences. Under the condition of realizing the synchronization technology, the sensitivity performance of the baseband receiver is improved.
Owner:成都东信科创科技有限公司
An Active Matched Thickness Molded Piezoelectric-Pneumatic Coupled Ultrasonic Transducer
InactiveCN106311584BImprove sensitivity performanceMechanical vibrations separationCouplingTransducer
The invention provides an active matching thickness mould pressing electropneumatic coupling ultrasonic transducer. The active matching thickness mould pressing electropneumatic coupling ultrasonic transducer comprises a piezoelectric plate (1), a first matching layer (2), a second matching layer (3), a transducer shell (4), a first joint (5) and a second joint (6); the piezoelectric plate (1), the first matching layer (2) and the second matching layer (3) are sequentially arranged in the transducer shell (4) in the emission direction of ultrasonic signals, the first matching layer (2) is of a round sheet structure made of microhole foaming materials, the second matching layer (3) is of a round sheet structure made of a polarization multi-hole PVDF thin film, the second matching layer (3) is communicated with the second joint (6) through a wire, and the diameter of the first matching layer (2) and the diameter of the second matching layer (3) are the same with that of the piezoelectric plate (1). According to the transducer, an active matching layer material is introduced, transmission sound waves can be actively amplified, and the sensitivity can be improved.
Owner:INST OF ACOUSTICS CHINESE ACAD OF SCI
A wireless communication method and device
ActiveCN108023850BImprove sensitivity performanceLower latencyMulti-frequency code systemsDigital feedbackAnalog signal
Owner:SHENZHEN RENERGY TECH
A device suitable for monitoring and receiving multi-system navigation signals
ActiveCN108594279BReduce volumeReduce power consumptionSatellite radio beaconingInformation processingLow noise
A device suitable for monitoring and receiving multi-system navigation signals, including a radio frequency processing module and the like. The RF signal processed by the receiving antenna and the low-noise amplifier first enters the RF processing module, completes the analog down-conversion processing, and obtains the analog intermediate frequency signal; secondly, after AD sampling, enters the intermediate frequency processing unit of the intermediate frequency and information processing module, and completes the intermediate frequency processing of the signal and anti-jamming function to obtain the digital intermediate frequency signal; enter the baseband processing module again, complete the despreading and demodulation of the signal and send the signal to the information processing unit of the intermediate frequency and information processing module, and obtain the required observation data; finally the observation data is sent by the interface The module is sent to external data processing software through the network port to complete the monitoring function of navigation signals; the device of the present invention has the characteristics of small size, low power consumption, high integration and high measurement accuracy, and the receivable signals cover Beidou global, GPS, All civilian signals of the four systems of GLONASS and Galileo.
Owner:BEIJING RES INST OF TELEMETRY +1
Temperature sensor based on twisted double-core optical fiber
ActiveCN113405690AImprove sensitivity performanceHigh mechanical strengthThermometers using physical/chemical changesCoupling light guidesOptical pathlengthMaterials science
The invention discloses a temperature sensor based on a twisted double-core optical fiber. The temperature sensor comprises a double-core optical fiber, tapering coupling areas at the two ends of the double-core optical fiber are connected with single-mode optical fibers respectively, two fiber cores of the double-core optical fiber are twisted to be spiral, the distances between the centers of the two fiber cores and the axis of the optical fiber are different, and formed spiral line screw pitches are different; and the group optical path difference of the signals in the two fiber cores approaches to zero. According to the invention, the optical fiber can obtain a high-sensitivity effect similar to a dispersion turning point without tapering.
Owner:WUHAN UNIV OF TECH
A method for the determination of 9-hydroxyfluorene based on an electrochemical hairpin DNA biosensor
InactiveCN102680549BHigh affinityHighly ordered structureMaterial electrochemical variablesElectrochemical responseElectrochemical biosensor
The invention belongs to the technical field of electrochemistry detection and chemical sensors for detecting 9-hydroxy fluorine based on a hairpin DNA modified gold electrode sensor, and relates to preparation of a hairpin DNA modified gold electrode capble of having electrochemical response to 9-hydroxy fluorine and detection on the 9-hydroxy fluorine with the electrode. Specifically, the synthetic sulfhydryl modified hairpin DNA is used as a raw material, the hairpin DNA is self-assembled to the surface of the gold electrode by the Au-S bond interaction to prepare the DNA modified electrode. The immobilized DNA electrode has high response to the 9-hydroxy fluorine, and the detection on the 9-hydroxy fluorine can be carried out according to the change of response of the electrochemistry to the impedance. The DNA sensor has the advantages of mild preparation condition, simplicity in operation, good stability and high sensitivity.
Owner:BEIJING NORMAL UNIVERSITY
Method and system for capturing and tracking gnss signal based on dual polarized antenna
The invention discloses a GNSS signal capturing and tracking method and system based on a dual-polarized antenna. The GNSS signal capturing method comprises the steps of receiving RHCP signals and LHCP signals through the RHCP antenna part and the LHCP antenna part respectively, capturing satellite signals based on the RHCP signals, extracting the serial numbers of non-captured satellites, prolonging the integral time, capturing signals of the non-captured satellites based on the RHCP signals and the LHCP signals, and capturing the signals of the same satellite or the signals of the different satellites respectively and synchronously based on the RHCP signals and the LHCP signals respectively. According to the GNSS signal capturing and tracking method and system based on the dual-polarized antenna, the direct signals and the echoed signals are synchronously received, and the satellite signals are processed and positioning is carried out based on the direct signals and the echoed signals. By adopting the GNSS signal capturing and tracking method and system based on the dual-polarized antenna, under the conditions of serious multi-path fading and poor signal environments, the sensitivity of a GNSS receiver can be improved under weak signal environments and complex signal environments such as cities and rooms.
Owner:WUHAN UNIV
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