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39results about How to "Short capture time" patented technology
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Three-dimensional quick capturing method for hopping spreading code phase and carrier wave Doppler
ActiveCN104218972AImprove anti-interference abilityImplement searchTransmissionFast Fourier transformFrequency synthesizer
The invention discloses a three-dimensional quick capturing method for a hopping spreading code phase and a carrier wave Doppler. The method includes: firstly, obtaining a local frequency-hopping carrier wave through a frequency synthesizer by using a local frequency-hopping pattern, and performing de-hopping and low-pass filtering to received signals; then, performing figure automatic gain control to data acquired after low-pass filtering, and extracting the data according to a corresponding ratio, and reducing operation amount of subsequent processing; and finally, producing a local direct sequence codon to de-spread the extracted data, and then performing a first accumulation, and performing a second accumulation after accumulated data frequency-hopping phase rotates, performing FFT (fast fourier transform) to the accumulated data, and finding a maximum peak by comparison. A local hopping spreading code phase and a frequency value corresponding to the maximum peak are a hopping spreading code phase and a carrier wave Doppler of the received signals. By the aid of the method, quick and simultaneous capturing of the hopping and spreading code phase and the carrier wave Doppler of a DS / FH (direct sequence / frequency hopping) mixing spread spectrum system under a strong interference condition is realized, and the method is low in realization complexity degree and has a fine anti-interference performance.
Owner:XIAN INSTITUE OF SPACE RADIO TECH
Methods and reagents for improved selection of biological molecules
ActiveUS20060003371A1Short capture timeQuick selectionMicrobiological testing/measurementMaterial analysisChemistryProteomics
Coated Ferromagnetic Density Particles or Density Particles with binding agents bound thereto capable of binding biological molecules and methods of use and apparatus for means are disclosed. Coated particles coupled to specific binding agents can be used for molecular biology and proteomic applications in research and diagnostics.
Owner:RUSSELL BIOTECH
Four-channel millimeter wave digital sum-difference monopulse precision tracking system
PendingCN111273278AIncrease the apertureSolving Phase Consistency IssuesRadio wave reradiation/reflectionAnti jammingIntermediate frequency
The invention provides a four-channel millimeter wave digital sum-difference monopulse precision tracking system, and aims to provide an anti-interference monopulse tracking system capable of quicklyintercepting and precisely tracking. The system is realized through the following technical scheme that four paths of superheterodyne linear receivers obtain the intermediate frequency echo signals; the intermediate frequency digital sum-difference operation is completed through a signal processing module to form a sum, azimuth difference and pitch difference branch of three-channel monopulse sum-difference for realizing target detection, interception and distance closed-loop tracking, and the obtained distance, an angle error and the speed information of a target is sent to a digital stable tracking servo system and the data processing module,the digital stable tracking servo system realizes the angle closed-loop tracking of the target by utilizing the target distance and the angle errorinformation, acquires the target angle information in real time and sends the target angle information to the data processing module and the signal processing module, and the data processing module performs fusion and filtering processing on the received target distance, real-time angle, angular error and speed information to obtain the real-time high-precision parameters of the target.
Owner:LINGBAYI ELECTRONICS GRP
Electronic timepiece
ActiveUS8169857B2Increase probabilityIncrease the number ofMechanical clocksSynchronous motors for clocksTime informationInternal time
An electronic timepiece having a function for receiving satellite signals transmitted from positioning information satellites, including a satellite signal reception unit that receives the satellite signals, a satellite capturing unit that executes a process of capturing the positioning information satellites within a capture time based on the satellite signals received by the satellite signal reception unit, a time adjustment information generating unit that acquires satellite information from the satellite signal sent from the positioning information satellite captured by the satellite capturing unit, and generates time adjustment information based on the satellite information, a time information adjustment unit that adjusts internal time information based on the time adjustment information, a time information display unit that displays the internal time information, and a time limit setting unit that variably sets a time limit for the time adjustment information generating unit to generate the time adjustment information based on the number of positioning information satellites captured by the satellite capturing unit and a reception level of the satellite signals transmitted from the positioning information satellites.
Owner:SEIKO EPSON CORP
Method for improving incoherent detection performance of MSK (minimum shift keying) signals
InactiveCN103078818AIncrease processing rateSampling avoidanceModulated-carrier systemsSignal trackingData transmission
The invention provides a method for improving the incoherent detection performance of MSK (minimum shift keying) signals, and aims at providing the method solving the problem of MSK signal application limitation caused by poorer incoherent detection performance and realization difficulty of coherent detection of the MSK signals. The method provided by the invention is realized through the following technical scheme that in an MSK data transmission receiving machine, a signal capture module stores baseband signals after the down-conversion into a memory, then, a high-speed clock is used for reading out the stored signals from the memory, next, the read signals are subjected to frequency offset compensation and bit synchronization searching according to the pre-divided frequency grooves, and the searching results are sent to a signal tracking module; the signal tracking module realizes the frequency and bit synchronization tracking through a frame head waveform matching correlator according to the capture results sent from the signal capture module; and a correlation judging module carries out correlation calculation on the signals sent by the signal tracking module with the local waveforms, selects the maximum correlation value from the correlation results and adopts the bit of the maximum correlation value corresponding to the middlemost part of the bit flow as the final judgment results to be output.
Owner:10TH RES INST OF CETC
A non-cooperative target satellite-rocket docking ring capturing mechanism and a capture method thereof
ActiveCN109131956AAvoid damageReduce collision forceCosmonautic vehiclesToolsNeedle roller bearingLinear motion
The invention relates to a non-cooperative target satellite-rocket docking ring capturing mechanism and a capture method thereof. The invention solves the problems of low integration, large volume, heavy weight and low tolerance, and long capture time of the existing non-cooperative target docking ring capturing mechanism. The non-cooperative target satellite-rocket docking ring capturing mechanism adopts a motor to directly drive the ball screw shaft to drive the screw nut fixed on the adapter to carry out linear motion. A low end of that adapter and the capture fin forms a swivel pair through the needle bearing assembly. An upper support housing needle roller bearing assembly is placed in the middle of the positioning groove of the capture finger. The upward and downward motion of the adapter makes the capturing finger to complete the opening and closing motion, and accomplish the capture of the non-cooperative target. The stroke switch and the stroke switch signal acquisition boardare used to control the opening and closing of the capture finger. The invention is applicable to the capture of the satellite-arrow butt joint ring, and has the advantages of small volume, large tolerance, high connection rigidity, short capture time and the like.
Owner:HARBIN INST OF TECH
Phase locked loop for an OFDM system
InactiveCN1853340AImprove performanceWork fastAngle demodulation by phase difference detectionLoop filterPhase correction
Techniques for tracking residual frequency error and phase noise in OFDM systems are provided. At the receiver, each received OFDM symbol is transformed using an FFT to obtain a received modulation symbol, which is serialized. A phase locked loop operates on the serialized receive modulation symbols and provides an independent phase correction value for each receive modulation symbol. Each received modulation symbol is corrected with its own phase correction value to obtain a phase corrected symbol. The phase error in each phase correction symbol is detected to obtain a phase error estimate for that phase correction symbol. The phase error estimate for each phase correction symbol is filtered (eg, with a second order loop filter) to obtain a frequency error estimate, which is accumulated to obtain a phase correction value for another received modulation symbol. Since independent phase correction values are used for the received modulation symbols, the phase correction symbols are not correlated.
Owner:QUALCOMM INC
Dust removing and filtering device based on honeycomb ceramic filter elements
InactiveCN105944469ANo damage such as corrosionEasy to useHuman health protectionDispersed particle filtrationEngineeringControl valves
The invention provides a dust removing and filtering device based on honeycomb ceramic filter elements. The dust removing and filtering device comprises a shell, a dust cavity, a clean cavity, a dust removal fan and a compressed air cylinder, wherein a waste gas inlet is formed in one side of the shell, and a purified gas outlet is formed in the other side of the shell; the dust cavity is formed inside the shell and is communicated with one end of the waste gas inlet, and at least one ceramic filter body is arranged inside the dust cavity; the clean cavity is formed inside the shell, a cavity partition plate is mounted between the clean cavity and the dust cavity and is connected with one end of the purified gas outlet; the dust removal fan is connected with the other end of the purified gas outlet; the compressed air cylinder is connected with the clean cavity through a pipeline, and a pulse inverse blow control valve is arranged on the pipeline. A dust removing and filtering device body adopts the ceramic filter body to filter dust, and the structural strength and the material strength of the dust removing and filtering device body are strong, so that the filter body cannot generate breakage, deformation, corrosion and other damages; as the pulse inverse blow control valve is adopted for controlling compressed air to flow out from the air cylinder so as to blow the dust on the ceramic filter body, the dust removing and filtering device provided by the invention has excellent dust down performance.
Owner:德州奥深节能环保技术有限公司
Vehicle-mounted satellite communication sky servo and front-end system and method thereof
The invention discloses a vehicle-mounted satellite communication sky servo and front-end system, which comprises an antenna system, a servo system and a communication front-end system, wherein, the antenna system comprises an antenna array (1), an antenna mounting reflecting plate (2), an electric bridge (3) and a power divider (4); the servo system comprises an orientation transmission mechanism, a pitching transmission mechanism, a servo controller and a navigation system; the communication front-end system comprises a power amplifier, a low-noise amplifier, a filter and a frequency converter; and the communication front-end system is connected with the communications terminal through a slip ring. The vehicle-mounted satellite communication sky servo and front-end system provided by the invention has the advantages of short catching time, high tracking and response speed, high tracking accuracy, independent tracking and communication, convenience in use, simple structure, good stability and low system cost, and dispenses with catching again in case of false tracking; and the eight-unit forming array antenna is adopted, so the antenna field gain is greatly improved and the communication quality is improved too.
Owner:成都创亿嘉科技有限公司
Pseudo code capturing method and device
ActiveCN108337015APseudo code capture implementationImplementing Synchronous Pseudocode CaptureTransmissionPseudo-codeComputer science
The invention discloses a pseudo code capturing method and device, and belongs to the technical field of communication. The pseudo code capturing method comprises the steps of receiving a signal sentby a transmitting end to obtain a received signal; performing convolution operation by adopting a local pseudo code sequence and the received signal so as to obtain a first correlation signal, whereinthe local pseudo code sequence is the pseudo code sequence same as the pseudo code sequence in an auxiliary field; multiplying the first correlation signal with a delayed conjugation signal to obtainintercorrelation signal, and the delayed conjugation signal is a conjugation signal of delay signal of the first correlation signal which delays for 4*M sampling points; performing convolution operation on the intercorrelation signal and a set sequence to obtain a second correlation signal, wherein the set sequence comprises M-1 bits with the value as 1, and 4*N-1 bits with the value as zero exist between each two adjacent bits with the value as 1; performing differencing processing on the second correlation signal and the delay signal of the second correlation signal which delays for 4*N*(M-1) / 2 sampling points to obtain an external correlation signal; and determining a start position of the auxiliary field based on the external correlation signal so as to accordingly realize pseudo codecapturing.
Owner:武汉船舶通信研究所
High-dynamic spread spectrum signal fast acquisition algorithm
The invention discloses a high-dynamic spread spectrum signal fast capture algorithm, which comprises the following steps of: 1, capturing a signal R1, obtaining a signal Rt after delay time t, and performing autocorrelation operation on the signal R1 and the signal Rt of the delay time t based on an FFT Doppler offset estimation technology; 2, performing autocorrelation operation on the signal R1and the signal Rt of the delay time t of the signal R1 by using FFT, processing a result, and performing frequency offset analysis to obtain a Doppler frequency change rate. According to the algorithm disclosed in the invention, the Doppler frequency change rate is obtained through frequency offset analysis and calculation; the signal frequency offset reconstruction signal is compensated according to the Doppler frequency change rate k to obtain a signal without the frequency change rate; then, the pseudo code phase can be obtained only through one-time pseudo code capture, Doppler and pseudocode limiting serial stepping search is not needed, meanwhile, the capture threshold is compared and analyzed, the local carrier signal frequency and the pseudo code phase are modified according to the comparison result, and rapid capture of the high-dynamic spread spectrum signal is achieved.
Owner:南京天际砺剑科技有限公司
Fast carrier capture method with low signal-noise ratio
ActiveCN101420411ASolve the problem of large data volume data storageImprove capture speedAssess restrictionOrthogonal multiplexSignal-to-noise ratio (imaging)Control signal
A method for quickly catching the low signal-to-noise ratio carrier comprises the following steps: (1) multiplying an input signal with a cos branching data generated by a first NCO module; (2) executing half band filtering; (3) executing down sampling to a first accumulated down sampling module, temporarily storing into an exterior SDRAM through an FIFO-IN module, and the data speed fsl and the maximum capture bandwidth after the first accumulated down sampling satisfy the relationship: fsl>2*f, [f1, f2] is the capture range, (4) reading the data in the exterior SDRAM through an FIFO-OUT module, and multiplying data of two branches of sin and cos generated by a second NCO; (5) entering a second down-sampling through the LPF; (6) executing FFT procession; and (7) adding a second NCO local oscillating frequency, repeating the steps (4)-(6) for n times to find out a maximum value in the results of step (6) and obtain the final frequency offset result. The method according to the invention has the advantages of adaptability for low signal-to-noise ratio, wide capture range and quick capture on the base that the modulation degree characteristic of the universal controlling signal is satisfied.
Owner:SPACE STAR TECH CO LTD
Micro-fluidic chip for separating and enriching exosomes and manufacturing method of micro-fluidic chip
ActiveCN112973813AUnique three-dimensional porous structureImprove capture efficiencyBioreactor/fermenter combinationsBiological substance pretreatmentsMicron scalePlastic materials
The invention discloses a micro-fluidic chip for separating and enriching exosomes and a manufacturing method of the micro-fluidic chip. A soluble material is ground to a micron level, the soluble material is added into a plastic material as a pore-forming agent and then smeared at a wide channel of a micro-channel, and a three-dimensional porous area is obtained by washing off the pore-forming agent. The three-dimensional porous area has a unique three-dimensional porous structure, so that the capture efficiency of the separated and enriched exosomes is improved, the capture time of the required exosomes is short, the consumption of a sample reagent is small, and the manufacturing cost is low. The high-quality exosomes can be rapidly separated from serum and cell supernate, the manufacturing cost and the manufacturing time are greatly reduced, batch preparation can be achieved, miniaturization is achieved, and the method is suitable for clinically separating and enriching the exosomes on a large scale.
Owner:QILU UNIV OF TECH +1
Methods and reagents for improved selection of biological materials
InactiveUS20170067886A1Increase field strengthHigh gradientBioreactor/fermenter combinationsBiological substance pretreatmentsTrappingVolumetric Mass Density
Methods, apparatus and compositions for separating a desired or undesired population or subpopulation from a biological sample are disclosed herein. The selection procedure is based on ferromagnetic, dense particles in a preferred size range from about 0.8 to about 1.2 microns. Specific binding agents are bound to the particles that recognize and bind to specific molecules on the targeted population or subpopulation, and the particles are mixed with the sample in such a way as to promote movement of the particles relative to the sample, promoting binding to the targeted population or subpopulation without non-specifically binding to non-targeted populations in the sample. Because of the large particle density, the bound population is separated from the fluid sample by gravity. Alternatively, the sample, including the bound, targeted population, is placed in a magnetic field such that the particles separate from the sample by evenly distributing over the vessel wall thus limiting non-specific trapping of the non-targeted population.
Owner:RUSSELL BIOTECH
Carbon dioxide trapping agent and preparation method thereof
InactiveCN111974344AAchieve reuseShort capture timeProductsGas treatmentCalcium silicateEnvironmental engineering
The invention provides a carbon dioxide trapping agent and a preparation method thereof, and relates to the technical field of energy conservation and emission reduction. The carbon dioxide trapping agent comprises the following raw materials: calcium orthosilicate and an alkali metal carbonate, wherein the molar quantity of the alkali metal carbonate accounts for 60% or more of the total molar quantity of the calcium orthosilicate and the alkali metal carbonate. The method has the advantages that the carbon dioxide trapping agent is wide in raw material source, low in preparation cost, low intrapping temperature and capable of achieving rapid regeneration, and no pollutant is generated in the whole process.
Owner:SHANGHAI UNIV
Police clamped steel fork
The invention discloses a police clamped steel fork, comprising a supporting part and a clamping part, wherein the supporting part comprises a steel pipe and a front end supporting rack, and the clamping part comprises a handle, a push rod, a connecting rod and a steel fork. The police clamped steel fork is simple in structure, the steel fork can be tightened through the action of the connecting rod only by pushing the handle, and a criminal can be independently arrested by policemen only by forking the neck of the criminal or vital part of the criminal for tightening, so that the arresting time is short, the needed personnel are few, the operation is convenient, the tightening force is large, the criminal can be easily subdued, and personal safety of the masses is effectively guaranteed.
Owner:CHONGQING SHIELD KING IND
Efficient multi-system self-adaptive capturing and tracking device for satellite receiver
InactiveCN111308518AImprove compatibilityGood real-time communicationSatellite radio beaconingCommunications systemCarrier signal
The invention discloses an efficient multi-system adaptive capturing and tracking device for a satellite receiver. The device comprises a coarse capturing module, a fine capturing module and a carrier, code and data tracking module; an antenna at the receiving end receives a signal, the signal is subjected to down-conversion and then enters a baseband processing part, and at the moment, the coarsecapturing module is used for executing a coarse capture process S11; the fine capturing module is used for executing a fine capturing process S12; and the carrier, code and data tracking module is used for executing a carrier, code and data tracking process S2 and the like. The device is high in compatibility, the same set of capturing and tracking system is suitable for various communication systems, seamless switching can be achieved among various coexisting communication mechanisms, and the communication real-time performance is higher; the size, the weight and the size are lower, the device is suitable for miniaturized and light satellite-borne application, the capture time is short, the tracking efficiency is high, and the frequency tracking error is small.
Owner:HUNAN MAXWELL ELECTRONICS TECH
Methods and reagents for improved selection of biological molecules
ActiveUS9790539B2Short capture timeQuick selectionMicrobiological testing/measurementMaterial analysisReagentChemistry
Coated Ferromagnetic Density Particles or Density Particles with binding agents bound thereto capable of binding biological molecules and methods of use and apparatus for means are disclosed. Coated particles coupled to specific binding agents can be used for molecular biology and proteomic applications in research and diagnostics.
Owner:RUSSELL BIOTECH
A three-finger non-cooperative target capture mechanism and its capture method
Owner:HARBIN INST OF TECH
High Efficiency Multi-standard Adaptive Acquisition and Tracking Method for Satellite Receiver
ActiveCN111239776BImprove compatibilityGood real-time communicationSatellite radio beaconingCommunications systemCarrier signal
Owner:HUNAN MAXWELL ELECTRONICS TECH
Screen capturing device and screen capturing method of touch screen equipment
InactiveCN112230830APrevent leakageSave timeDigital data protectionDigital data authenticationComputer hardwareHardware modules
The invention discloses a screen capture device and a screen capture method of touch screen equipment, the screen capture device of the touch screen equipment comprises a screen capture APP, a hardware module, a storage module and a processing module, the screen capture APP comprises a setting module, a linkage module, a reading module, an editing module and a communication module, the hardware module comprises a power key, a volume up key, a volume down key and a camera which are arranged on the touch screen equipment; according to the method, automatic screen recording can be achieved, someoperations difficult to reproduce can be stored in time, the screen is recorded first and then a picture is captured, the picture with extremely short time is conveniently captured, the problem that the screen capturing time is difficult to control is solved, the use habits of a user can be counted, and after the password of the touch screen equipment is cracked and fails, the user can still be authenticated, private information of an owner is protected, and the invention has the advantages that the picture can be stored in time, the screen capture opportunity does not need to be guaranteed, and safety is high.
Owner:YANCHENG HUAXU OPTOELECTRONICS TECH CO LTD
Method and device for fast acquisition of high data rate burst communication based on spread spectrum technology
The invention belongs to the technical field of ultra short wave communication systems, and particularly relates to a high data rate burst communication fast acquisition method and a device based on a spread-spectrum technology. The method comprises steps: accumulation down sampling is carried out on base band data with twice the spread-spectrum code rate as accumulation zero clearing signals; down sampling base band signals and spread-spectrum codes sampled at the twice spread-spectrum code rate are subjected to vector storage, the down sampling base band data slide at the twice spread-spectrum code rate respectively, the phase of the local spread-spectrum codes is fixed and the local spread-spectrum codes do not slide, under the same clock action, the two are grouped for XOR accumulation, an incoherent peak of a half chip is solved and compared until the incoherent peaks of all half chips are compared and the maximum value, the second maximum value, the third maximum value and the code phase are latched, the average value of the incoherent peaks of all code phases is solved, and whether signals are acquired successfully is judged. Thus, acquisition on high data rate ultra short wave burst communication based on the spread-spectrum technology can be quickly realized, and the hardware realization complexity is low.
Owner:西安烽火电子科技有限责任公司
Full-automatic satellite station tracking method and device and storage medium
PendingCN114779287AMeet the star appAccurately estimate powerSatellite radio beaconingAntennasRemote sensingDemodulation
The embodiment of the invention provides a full-automatic satellite station tracking method and device and a storage medium, and the method comprises the steps: 1, determining a front-end satellite signal reference value, and determining a search region; 2, Z-shaped scanning is carried out on the search area according to the mode of upper right and lower left, a front-end satellite signal reference value is read in the scanning process, and the front-end satellite signal reference value comprises one of a satellite signal power value and a satellite signal to noise ratio; and step 3, storing and comparing the read front-end satellite signal reference value, determining the position of the maximum value, judging the current modulation and demodulation state, determining whether the current signal is valid or not, entering a tracking mode if the current signal is valid, and finally locking the satellite, otherwise, continuing scanning and repeating the step 2. The problem that tracking is difficult due to the fact that no reference signal exists or satellite reference signals are weak and the satellite beacon frequency band is large is solved.
Owner:AKD COMM TECH
Method for improving incoherent detection performance of MSK (minimum shift keying) signals
InactiveCN103078818BIncrease processing rateSampling avoidanceModulated-carrier systemsSignal trackingData transmission
Owner:10TH RES INST OF CETC
Capturing net
PendingCN112781442ASimple structureEasy to manufactureWeapons typesEngineeringStructural engineering
The invention relates to the technical field of capturing, in particular to a capturing net. The capturing net comprises a supporting ring, a handle and a net cover; the net cover is arranged on the inner side of the supporting ring; the net cover is detachably connected with the supporting ring; the outer side of the supporting ring is connected with the handle; the handle is a telescopic handle; the handle is divided into a front-end handle and a rear-end handle; the front-end handle is sleeved on the rear-end handle; the front-end handle is hollow, and a movable rack is arranged in the front-end handle and is connected with a steel wire; the rear-end handle is a hollow tube; a spring is arranged in the hollow pipe and is connected with a rack in the front-end handle; and the end, away from the supporting ring, of the handle is closed. The device has the advantages of being simple in structure and convenient to manufacture and use; the capturing effect is good, safe and reliable; the capturing time is short, and the disposal speed is high; and the applicability is wide.
Owner:青海宇航通信科技有限公司
Vehicle-mounted satellite communication sky servo and front-end system and method thereof
ActiveCN102386962BHigh gainShort capture timeRadio transmissionPosition/course control in three dimensionsFrequency changerAntenna gain
Owner:成都创亿嘉科技有限公司
A Fast 3D Acquisition Method of Hopping Spread Spectrum Code Phase and Carrier Doppler
ActiveCN104218972BImprove anti-interference abilityImplement searchTransmissionFast Fourier transformCarrier signal
The invention discloses a three-dimensional quick capturing method for a hopping spreading code phase and a carrier wave Doppler. The method includes: firstly, obtaining a local frequency-hopping carrier wave through a frequency synthesizer by using a local frequency-hopping pattern, and performing de-hopping and low-pass filtering to received signals; then, performing figure automatic gain control to data acquired after low-pass filtering, and extracting the data according to a corresponding ratio, and reducing operation amount of subsequent processing; and finally, producing a local direct sequence codon to de-spread the extracted data, and then performing a first accumulation, and performing a second accumulation after accumulated data frequency-hopping phase rotates, performing FFT (fast fourier transform) to the accumulated data, and finding a maximum peak by comparison. A local hopping spreading code phase and a frequency value corresponding to the maximum peak are a hopping spreading code phase and a carrier wave Doppler of the received signals. By the aid of the method, quick and simultaneous capturing of the hopping and spreading code phase and the carrier wave Doppler of a DS / FH (direct sequence / frequency hopping) mixing spread spectrum system under a strong interference condition is realized, and the method is low in realization complexity degree and has a fine anti-interference performance.
Owner:XIAN INSTITUE OF SPACE RADIO TECH
Frequency capture method suitable for continuous phase modulation signal
PendingCN114338315AWide capture frequencyRealize frequency offset captureMulti-frequency code systemsFast Fourier transformFrequency spectrum
The invention provides a frequency capturing method suitable for a continuous phase modulation signal, which comprises the following steps of: S1, performing integral speed reduction on a received signal, and then performing segmented windowing processing and segmented FFT (Fast Fourier Transform) operation to obtain a frequency domain signal; s2, carrying out incoherent accumulation on the frequency domain signals, and then carrying out spectrum matching shift accumulation according to the signal spectrum bandwidth to obtain a matching cyclic accumulation spectrum; s3, detecting the peak value of the matching cyclic accumulation spectrum, and calculating a Doppler frequency deviation value; and S4, repeating the steps S1 to S3 to obtain a plurality of groups of Doppler frequency deviation values, and calculating an average value as a frequency capture value.
Owner:北京融为科技有限公司
A wideband ds/fh signal parameter estimation method and system based on keystone transform
Owner:ACAD OF OPTO ELECTRONICS CHINESE ACAD OF SCI
Method and system for iris recognition
ActiveUS10972651B2Increase rangeImprove efficiencyTelevision system detailsAcquiring/recognising eyesIdeal imageComputer graphics (images)
The present application discloses an iris identification system and an iris identification method thereof. The iris identification system includes: a camera module including at least two cameras, the cameras having different depths of field and being configured to capture iris images; a distance detection apparatus configured to detect a distance between a user and the camera module; a processing chip configured to find, according to the detected distance, a depth of field corresponding the distance and control a camera having the depth of field to be turned on, and further configured to control multiple cameras in the camera module to be turned on simultaneously until one camera has captured an ideal image. At least two cameras having different depths of field are disposed in the iris identification system provided in the present application; a camera having a suitable depth of field is turned on correspondingly according to a detected distance between a user and a camera module to capture an image, or multiple cameras are turned on simultaneously until one camera has captured a clear iris image. The present application achieves good man-machine friendliness and a short capturing time and improves the efficiency of iris identification.
Owner:ZKTECO USA LLC +1
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