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44 results about "Electric vector" patented technology
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Exposure system, exposure method and method for manufacturing a semiconductor device
InactiveUS20060132748A1Photomechanical apparatusSemiconductor/solid-state device manufacturingSource planeElectricity
An exposure system includes: an illumination optical system defining, in an effective illumination source plane, a center region forming a perpendicularly incident light and first and second eccentric regions forming obliquely incident lights having a perpendicular electric vector component perpendicular to a straight line connecting the first and second eccentric regions, the electric vector component being larger than a parallel electric vector component parallel to the straight line, and illuminating the mask pattern with the perpendicularly incident light and the obliquely incident lights; and a projection optical system projecting an image of the mask pattern to a processing object.
Owner:KK TOSHIBA
High-linearity degree-of-polarization quantum-well infrared detector with plasmon micro-cavity coupled structure
InactiveCN103762220AHigh extinction ratioHigh polarization resolving powerRadiation controlled devicesElectric vectorLinearity
The invention discloses a high-linearity degree-of-polarization quantum-well infrared detector with a plasmon micro-cavity coupled structure. The detector is composed of an upper metal grating layer, a quantum-well infrared photovoltaic conversion activating layer and a lower metal reflecting layer, wherein the upper metal grating layer is formed by metal strips. The detector has the advantages that under the mode selection effect of an electromagnetic wave near-field coupled micro cavity formed by plasmon resonance between the upper metal grating layer and the lower metal reflecting layer, photons capable of entering the micro cavity are mainly photons capable of achieving resonance with a detected wavelength polarization mode; the direction of electric vectors of the photons entering the micro cavity is changed to the z direction from the x direction by being modulated in a micro-cavity mode, and the photons can be absorbed by quantum-well sub-bands in a transition mode to achieve the photovoltaic conversion process. With the advantages, the polarization coupled structure can greatly improve the extinction ratio of polarization responses, and extremely-high polarization distinguishing capacity of the detector is achieved.
Owner:SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI
Method for orthogonal analyte stacking/injection systems in electrophoresis
InactiveUS7223325B2High resolutionFaster and high injectionSludge treatmentVolume/mass flow measurementCapillary volumePresent method
Owner:UNIV OF VIRGINIA ALUMNI PATENTS FOUND
Tunable single-passband microwave photonic filter based on Brillouin optical carrier recovery
ActiveCN105607302AImplement direct mappingSimple structureNon-linear opticsElectric vectorOptical coupler
The invention discloses a tunable single-passband microwave photonic filter based on Brillouin optical carrier recovery. The tunable single-passband microwave photonic filter comprises a tunable laser, an optical coupler, a first optical amplifier, a second optical amplifier, a first optical circulator, a second optical circulator, first-section single-mode optical fibers, second-section single-mode optical fibers, a first optical polarization controller, a second optical polarization controller, a Mach-Zehnder modulator, an optical fiber Fabry-Perot filer, an optical isolator, a high-speed photoelectric detector and an electric vector network analyzer, wherein the first-section single-mode optical fibers and the second-section single-mode optical fibers are each wound together in a compound mode. By means of the tunable single-passband microwave photonic filter based on the Brillouin optical carrier recovery, the microwave photonic filter with single-passband frequency responses can be achieved, the wavelength of outgoing light of the tunable laser can be changed, and the broadband of the filtering passband of the microwave photonic filter can be tunable.
Owner:INST OF SEMICONDUCTORS - CHINESE ACAD OF SCI
Exposure system, exposure method and method for manufacturing a semiconductor device
InactiveUS7436491B2Semiconductor/solid-state device manufacturingPhotomechanical exposure apparatusSource planeElectric vector
An exposure system includes: an illumination optical system defining, in an effective illumination source plane, a center region forming a perpendicularly incident light and first and second eccentric regions forming obliquely incident lights having a perpendicular electric vector component perpendicular to a straight line connecting the first and second eccentric regions, the electric vector component being larger than a parallel electric vector component parallel to the straight line, and illuminating the mask pattern with the perpendicularly incident light and the obliquely incident lights; and a projection optical system projecting an image of the mask pattern to a processing object.
Owner:KK TOSHIBA
Method for producing retardation film
InactiveUS20090220758A1Accurately and easily manufacturedSynthetic resin layered productsCellulosic plastic layered productsFilm planeElectric vector
A method for producing a retardation film comprising the steps of: (a) uniaxially stretching an original film for producing retardation film in one direction at either a temperature T1 or T2; and then (b) uniaxially stretching the film stretched in the step (a) in a direction perpendicular to the above-mentioned direction of stretching at a temperature T2 or T1 different from the above-mentioned temperature, in which the original film for producing retardation film has a characteristic that a phase of linearly polarized light entering vertically into the film plane and having an oscillating surface of an electric vector in an X-Z plane against linearly polarized light entering vertically into the film plane and having an oscillating surface of an electric vector in a Y-Z plane lags by uniaxially stretching in the direction of the X axis at a temperature T1, and leads by uniaxially stretching in the direction of the X axis at a temperature T2 different from the above-mentioned temperature T1, in which the X axis is an uniaxially stretching direction, the Y axis is a direction perpendicular to the uniaxially stretching direction in the film plane, and the z axis is a direction of a thickness of the film.
Owner:ZEON CORP
Retardation film
A retardation film composed of a laminated film which comprises a layer A composed of a material having a positive intrinsic birefringence and a deflection temperature under load of Ts(A) and a layer B composed of a material having a negative intrinsic birefringence and a deflection temperature under load of Ts(B), in which a difference between Ts(A) and Ts(B) is 5° C. or more; the retardation film has a stretching temperature Tα which causes delaying of a phase after the stretching to a phase before the stretching and a stretching temperature Tβ which causes hastening of a phase after the stretching to a phase before the stretching, in cases of uniaxially stretching in a direction of an X axis by draw ratio of 1.25 at temperature in the range that the retardation film can be stretched, in which the phase is of linearly polarized light ΨX having an oscillating surface of an electric vector in an X-Z plane and entering at an incident angle of 0 degree in relation to linearly polarized light ΨY having an oscillating surface of an electric vector in a Y-Z plane and entering at an incident angle of 0 degree, the X axis is an uniaxially stretching direction, the Y axis is a direction perpendicular to a direction of the X axis in the film plane, and the Z axis is a direction of a thickness of the film; and the retardation film meets a relation of 0.92≦R40 / Re≦1.08, wherein Re (nm) is a retardation value of light having a wavelength of 550 nm at an incident angle of 0 degree, and R40 (nm) is a retardation value of light having a wavelength of 550 nm at an incident angle of 40 degrees.
Owner:ZEON CORP
Quantum well infrared circular polarization detector
ActiveCN109742173AImproving the Selective Extinction Ratio of Circularly Polarized LightImprove conversion abilityLight polarisation measurementSemiconductor devicesElectrical field strengthElectric vector
The invention discloses a quantum well infrared circular polarization detector. The quantum well infrared circular polarization detector structurally comprises a metal reflector, a quantum well infrared photoelectric conversion activation layer, a large-period metal grating, a small-period sub-wavelength metal grating and a two-dimensional metal metasurface, wherein the large-period metal grating,the small-period sub-wavelength metal grating and the two-dimensional metal metasurface are embedded in a dielectric layer which is transparent for working wavebands. By utilizing the two-dimensionalmetal metasurface and the small-period sub-wavelength metal grating, a selection and conversion cavity is formed, so that specific types of circularly polarized light can be selected to be transmitted and then converted into corresponding linearly polarized light; and the large-period metal grating and the metal reflector form a plasmon micro cavity, so that the direction of photon electric vectors passing through the selection and conversion cavity is converted from an x direction to a z direction to ensure that the photon electric vectors can be absorbed by energy quantum well sub-band transition to realize photoelectric conversion. Meanwhile, the micro cavity is capable of effectively the electric field intensity of a quantum well infrared photoelectric conversion activation area to further enhance the photon absorption, thereby realizing the selection and detection, for circularly polarized light, of the detector.
Owner:SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI
Phase precoding method for constellation point distribution optimization and vector millimeter wave signal generation system
ActiveCN106877935AImprove stabilityHigh purityPhase-modulated carrier systemsRadio-over-fibrePrecodingRadio over fiber
The invention belongs to the technical field of radio over fiber wireless communication systems and particularly relates to a phase precoding method for achieving constellation point distribution optimization and a vector millimeter wave signal generation system based on the method. The phase precoding method for constellation point distribution optimization achieves the constellation point distribution optimization by adjusting the precoding phase factor, and can promote the uniform distribution of the constellation points of the received vector signal at the receiving end, thereby improving the detected vector signal performance. The vector millimeter wave signal generation system based on the above-mentioned phase precoding scheme can realize the generation of the six-fold frequency electric vector millimeter wave of high stability, high purity and high performance, and has the advantages of simple implementation and simple structure. The application in the communication system can simplify the radio over fiber wireless communication system architecture, and reduce the cost of radio over fiber wireless communication system.
Owner:FUDAN UNIV
Surface illumination device and display using the same
InactiveUS20050162865A1Small sizeReduce weightMechanical apparatusPoint-like light sourceElectricityLight guide
An object of the invention is to provide a surface illumination device and a display device using it, which can contribute to improvement of display qualities. A surface illumination device 10 comprising a light guide plate 1 for propagating incident light inside itself and reflecting the light at the reflecting prism face 1S to output the light from the light exit face. This further comprises: a polarizing plate 3 provided on the light exit face; and an anti-reflection film 4 provided on the polarizing plate 3. The reflecting prism face 1S extends so that a direction of electric vector's vibration of an s-polarized light component of a reflecting light ray caused by an incident light ray in a predetermined propagation direction is in parallel with a polarization axis of the polarizing plate 3, whereby a light efficiency can be improved.
Owner:KONINKLIJKE PHILIPS ELECTRONICS NV
Polarized optic-acoustic microscopic imaging device and method
InactiveCN109946236AHigh resolution imagingHigh sensitivityPolarisation-affecting propertiesMicroscopic imageElectric vector
The invention discloses a polarized optic-acoustic microscopic imaging device and method. The device comprises an optic-acoustic excitation light source generation assembly, an optic-acoustic signal processing assembly and a collection platform assembly; and the optic-acoustic excitation light source generation assembly comprises a laser, a first lens, a pin hole, a second lens, a polarizer, a 1 / 2glass slide, a scanning vibrating mirror and a focusing lens. The method comprises the concrete steps that the laser generates a laser beam, the laser beam passes the first lens, pin hole, second lens, polarizer, 1 / 2 glass slide, scanning vibrating mirror and focusing lens successively and forms linearly polarized light, the focusing lens focuses the linearly polarized light on a sample to generate an optic-acoustic signal, and the optic-acoustic signal processing assembly reconstructs a sample polarized optic-acoustic and quantitative ordered-degree 3D imaging graph according to optic-acoustic signals, generated by linearly polarized light in different electric vector direction, collected by the collection platform assembly and a medium ordered degree representing parameter. Thus, lossless high-definition 3D polarized light optic-acoustic microscopic imaging and quantitative structured ordered degree imaging can be realized.
Owner:SOUTH CHINA NORMAL UNIVERSITY
Intelligent nuclear phase device
ActiveCN102062819AQuick testImprove operation and maintenance efficiencyPhase sequence/synchronism indicationLiquid-crystal displaySmart substation
The invention discloses an intelligent power nuclear phase device, which comprises a central processing unit (CPU) board, a digital quantity sampling board, an analog quantity sampling board and a liquid crystal display board, wherein the boards are connected through a rear panel bus. The device is characterized by also comprising electric vector acquisition interfaces of intelligent secondary equipment in an intelligent transformer station and conventional secondary equipment in a conventional transformer station; by comparing electric vectors of different interfaces, the purpose of electricphase check is achieved; and the electric vector acquisition interfaces comprise an analog quantity input interface module, a 9-1 interface module, a 9-2 interface module and an FT3 interface module.The device can be used for comprehensive phase check of digital electric quantity and conventional analog electric quantity in the intelligent transformer station, and improves the field engineering debugging and daily operation and maintenance efficiency of the intelligent transformer station.
Owner:HUAIAN OF JIANGSU ELECTRIC POWER COMPANY POWER SUPPLY +3
Exposure apparatus, exposure method, and semiconductor device manufacturing method
According to an aspect of the invention, there is provided an exposure apparatus including an illumination optical system which forms an effective light source having a first polarization area where a mask pattern is illuminated with polarized light dominated by an electric vector component radial from a center position on an effective light source plane, and a second polarization area where the mask pattern is illuminated with light whose electric vector vibration is not biased in a specific direction; and a projection optical system which projects an image of the mask pattern onto an object to be processed.
Owner:KK TOSHIBA
Determination of Field Distribution
InactiveUS20080284446A1Reduce field summation orderImprove field convergenceSurface/boundary effectPhotomechanical apparatusElectricityElectric vector
A method for determining field intensity for a particle on a substrate, the method comprising providing an incident wave, determining an electric vector of the field and a magnetic vector of the field inside and outside of the particle, and determining additional scattered fields inside and outside of the particle due to reflection of the incident wave from the substrate.
Owner:AGENCY FOR SCI TECH & RES
Method and device for separating positive sequence component and negative sequence component of network voltage or current
ActiveCN103117544AEasy to implementShorten the timeAc network circuit arrangementsThree phase converterElectric power system
The invention discloses a method and a device for separating a positive sequence component and a negative sequence component of network voltage or current, relates to control technology of a three-phase converter of an electric power system, and aims to provide a simpler method for separating the positive sequence component and the negative sequence component and a device corresponding to the method. The technical scheme mainly includes that the method includes a negative sequence component extracting step and a positive sequence component extracting step, wherein the negative sequence component extracting step includes the steps: N1, converting a three-phase electric vector including the voltage or the current of a power network into a first vector in a two-phase static coordinate system; N2, delaying the first vector and then rotating the phase position of the first vector to obtain a second vector; and N3, adding the first vector and the second vector to obtain the negative sequence component; the positive sequence component extracting step includes the steps: P1, delaying the first vector and then rotating the phase position of the first vector to obtain a third vector; and P2, adding the first vector and the third vector to obtain the positive sequence component.
Owner:四川科陆新能电气有限公司
Determination of field distribution
InactiveUS8222905B2Reduce field summation ordersFast convergenceMagnetic measurementsPhotomechanical apparatusElectricityElectric vector
A method for determining field intensity for a particle on a substrate, the method comprising providing an incident wave, determining an electric vector of the field and a magnetic vector of the field inside and outside of the particle, and determining additional scattered fields inside and outside of the particle due to reflection of the incident wave from the substrate.
Owner:AGENCY FOR SCI TECH & RES
Polarized light-emitting device
The invention provides a polarized light-emitting device. The polarized light-emitting device comprises an excitation source for emitting laser light, and a wavelength conversion device, wherein the wavelength conversion device comprises a heat-dissipating device, a wavelength conversion layer positioned on the heat-dissipating device, and a wire grid polarizer positioned on the wavelength conversion layer; the laser light emitted by the laser source enters the wire grid polarizer; the electric vector direction of the laser light is vertical to the wire grid trend of the wire grid polarizer in order that the laser light can enter the wavelength conversion layer through the wire grid polarizer, and is excited to emit excited light. By adopting the polarized light-emitting device, light penetrating through the wire grid polarizer in non-polarized light emitted from the wavelength conversion layer is polarized light in a specific polarization direction, other light is reflected back to the wavelength conversion layer by the wire grid polarizer to be scattered and reflected, a part of specific polarized light is transmitted out after the other light is emitted from the wire grid polarizer, and most light is emitted in the form of polarized light after repeated circulation.
Owner:杨毅
A kind of electrophilic biological carrier and its preparation method
ActiveCN103420490BIncrease microbial biomassGood biocompatibilityBiological water/sewage treatmentElectric vectorSludge
The invention discloses an electrophilic suspended bio-carrier and a preparation method thereof. The electrophilic suspended bio-carrier comprises the following raw materials in parts by mass: 100-250 parts of high-molecular interstitial substance, 2-15 parts of electrophilic functional material, 2-20 parts of auxiliary material 1; 2-20 parts of auxiliary material 2 and 1-10 parts of auxiliary material 3. The electrophilic suspended bio-carrier is formed by the raw materials through mixing, granulation, screw extrusion, cooling and cutting. The electrophilic suspended bio-carrier provided by the invention is convenient to prepare, and the density of the electrophilic suspended bio-carrier is controllable within 0.91-0.97 g / cm<3>; according to the property that microbes have negative electricity in water, the electrophilic suspended bio-carrier is mixed with the positively charged functional material to endow the surface of the electrophilic suspended bio-carrier with positive charge to enhance the compatibility between the microbes and the electrophilic suspended bio-carrier. The electrophilic suspended bio-carrier is favorable for apposition growth of microbes and easy for biofilm culturing, has a short period, large biomass, high ammonia nitrogen removal efficiency and good effluent quality; the sludge settling property is good, and equipment operation is free from a sludge blockage phenomenon; the service life of the electrophilic suspended bio-carrier is long and manual replacement and maintenance are not needed.
Owner:DALIAN UNIV OF TECH
Front and rear dual-drive all-electric permanent-magnet shaftless vector propulsion structure for high-speed submarine
PendingCN107792323AEffectively balance the pressure difference between front and backSmall negative pressure resistanceUnderwater vesselsUnderwater equipmentElectricityElectric vector
The invention discloses a front and rear dual-drive all-electric permanent-magnet shaftless vector propulsion structure for a high-speed submarine. The front and rear dual-drive all-electric permanent-magnet shaftless vector propulsion structure comprises a front all-electric permanent-magnet shaftless vector propeller, a submarine cavitation maintaining housing and a rear all-electric permanent-magnet shaftless vector propeller, wherein a front anti-marine organism housing is mounted at the front end of the front all-electric permanent-magnet shaftless vector propeller; a front ternary vectorrectification nozzle is mounted at the rear end of the front all-electric permanent-magnet shaftless vector propeller; and a rear anti-marine organism housing is mounted at the front end of the rearall-electric permanent-magnet shaftless vector propeller, and a rear ternary vector rectification nozzle is mounted at the rear end of the rear all-electric permanent-magnet shaftless vector propeller. According to the front and rear dual-drive all-electric permanent-magnet shaftless vector propulsion structure disclosed by the invention, through the front all-electric permanent-magnet shaftless vector propeller, pressure difference generated in the front-and-rear direction is effectively balanced during the advancement process of the submarine, the negative pressure resistance generated by the fluid during the advancement process of the submarine is significantly reduced, an auxiliary power source is provided for the submarine, heat release is reduced, and noises and efficiency loss are reduced; and through the front ternary vector rectification nozzle and the rear ternary vector rectification nozzle, the turbulence phenomenon generated by the propeller can be effectively reduced, thecruising speed can be significantly increased, and the invisibility can be enhanced.
Owner:西安西部新锆科技股份有限公司
Method for designing arbitrary duty ratio unequal band width optical interleaver
ActiveCN101520529AImprove flatnessImprove bandwidth utilizationWavelength-division multiplex systemsCoupling light guidesDigital signal processingElectric vector
The invention relates to a method for designing an arbitrary duty ratio Michelson Gires-Touruois interferometer type unequal bandwidth optical interleaver. The method simplifies complicated transmission of a multi-mirror GT cavity and the expression of a light wave electric vector in a reflection direction through z transform in a digital signal processing, calculates the expressions of transmission functions of two paths of output ports of the optical interleaver on the basis, and obtains the cavity length and the arm length difference of the GT cavity, and the reflectivity of each mirror surface of the GT cavity with design principle of an elliptic filter by a limit point value of a transfer function. Particularly, an even-order Michelson Gires-Tournois interferometer type optical interleaver with definite exponent number can be designed to realize the arbitrary duty ratio optical interleaver throughby respectively decomposing two paths of transmission functions of the optical interleaver into sum and difference of two all-pass filters with adjacent exponent numbers. The unequal bandwidth optical interleaver designed by the method has the characters of high flatness, high bandwidth utilization, high isolation, and the like for two paths of output spectrums. Particularly, the design method does not require programming for calculation, has simple calculation, represents better advantages for the situation of cascading a plurality of reflectors, and has wide application prospect in special wave filter, gain equalization and other fields.
Owner:SHANGHAI MUNICIPAL ELECTRIC POWER CO +1
Method for producing retardation film
ActiveUS20150224727A1Accurately and easily manufacturedSynthetic resin layered productsCellulosic plastic layered productsElectric vectorEngineering
A method for producing a retardation film comprising the steps of: (a) uniaxially stretching an original film for producing retardation film in one direction at either a temperature T1 or T2; and then (b) uniaxially stretching the film stretched in the step (a) in a direction perpendicular to the above-mentioned direction of stretching at a temperature T2 or T1 different from the above-mentioned temperature, in which the original film for producing retardation film has a characteristic that a phase of linearly polarized light entering vertically into the film plane and having an oscillating surface of an electric vector in an X-Z plane against linearly polarized light entering vertically into the film plane and having an oscillating surface of an electric vector in a Y-Z plane lags by uniaxially stretching in the direction of the X axis at a temperature T1, and leads by uniaxially stretching in the direction of the X axis at a temperature T2 different from the above-mentioned temperature T1, in which the X axis is an uniaxially stretching direction, the Y axis is a direction perpendicular to the uniaxially stretching direction in the film plane, and the Z axis is a direction of a thickness of the film.
Owner:ZEON CORP
Method of and apparatus for measuring electric field vector and microscope using same
InactiveUS20100091294A1High precisionMore interpretable wayNanoopticsUsing optical meansElectricityElectric vector
A system for measuring an electric field vector includes an optical extractor configured to extract an optical signal having a spatial resolution of a nanometer level. The optical signal corresponds to incident light at a measuring position within an examination area of a surface of a specimen. The system further includes a polarization analyzer for analyzing a polarization characteristic of the optical signal extracted by the optical extractor, and an electric field vector determinator for determining at least a size and an orientation axis of an electric vector at the measuring position using the polarization characteristic analyzed by the polarization analyzer.
Owner:SAMSUNG ELECTRONICS CO LTD +1
Surface illumination device and display device using the same
Owner:KONINK PHILIPS ELECTRONICS NV
Method and device for separating positive sequence component and negative sequence component of grid voltage or current
ActiveCN103117544BEasy to implementShorten the timeAc network circuit arrangementsElectric vectorThree phase converter
The invention discloses a method and a device for separating a positive sequence component and a negative sequence component of network voltage or current, relates to control technology of a three-phase converter of an electric power system, and aims to provide a simpler method for separating the positive sequence component and the negative sequence component and a device corresponding to the method. The technical scheme mainly includes that the method includes a negative sequence component extracting step and a positive sequence component extracting step, wherein the negative sequence component extracting step includes the steps: N1, converting a three-phase electric vector including the voltage or the current of a power network into a first vector in a two-phase static coordinate system; N2, delaying the first vector and then rotating the phase position of the first vector to obtain a second vector; and N3, adding the first vector and the second vector to obtain the negative sequence component; the positive sequence component extracting step includes the steps: P1, delaying the first vector and then rotating the phase position of the first vector to obtain a third vector; and P2, adding the first vector and the third vector to obtain the positive sequence component.
Owner:四川科陆新能电气有限公司
Method for designing arbitrary duty ratio unequal band width optical interleaver
ActiveCN101520529BImprove flatnessImprove bandwidth utilizationWavelength-division multiplex systemsCoupling light guidesDigital signal processingElectric vector
Owner:SHANGHAI MUNICIPAL ELECTRIC POWER CO +1
Optimal phase precoding method for constellation point distribution and vector millimeter wave signal generation system
ActiveCN106877935BImprove stabilityHigh purityPhase-modulated carrier systemsRadio-over-fibreRadio over fiberPrecoding
Owner:FUDAN UNIV
Electric-vector included angle measurement circuit and electric energy meter
ActiveCN102735931AMeet precise measurement requirementsVoltage-current phase angleElectricityElectric vector
The invention belongs to the electric energy metering field and provides an electric-vector included angle measurement circuit and an electric energy meter. According to the invention, a first quasi zero crossing point time coordinate data generation module and a second quasi zero crossing point time coordinate data generation module are used to detect and correct approximated zero crossing point time coordinate data of a sinusoidal signal and outputs quasi zero crossing point time coordinate data respectively. An electric-vector included angle calculator is used to calculate electric-vector included angles of two quasi zero crossing point time coordinate data so as to obtain electric-vector included angle data. An electric-vector included angle measurement result does not influenced by a used sinusoidal signal zero crossing point time coordinate obtaining method and a sampling number of an analog-to-digital converter so that the electric-vector included angle measurement result satisfies a precision measurement requirement.
Owner:SHENZHEN RENERGY TECH
DOA-polarization information joint estimation method based on incomplete electric vector sensor
PendingCN114113808AReduce computationReduce mutual coupling effectsElectromagentic field characteristicsAlgorithmCross correlation matrix
The invention discloses a DOA-polarization information joint estimation method based on an incomplete electric vector sensor. The performance of the existing parameter estimation algorithm applied to the incomplete electromagnetic vector sensor is severely reduced under the condition of low signal-to-noise ratio. In addition, most algorithms need spectrum searching or parameter matching, and therefore the calculation process is extremely complex. The method comprises the following steps of: 1, dividing two sub-arrays, and performing operation on the basis of a cross-correlation matrix of the two sub-arrays; and 2, the parameter estimation performance under the condition of low signal-to-noise ratio is greatly improved, spectrum search or parameter matching is not required by the algorithm, the calculation speed is further improved, and the effectiveness of the algorithm on signal DOA and polarization parameter estimation is verified by a simulation experiment result.
Owner:HANGZHOU DIANZI UNIV
A Method of Electric Vector Millimeter Wave Generation Based on Push-Pull Modulator
The invention discloses a method for generating an electric vector millimeter wave based on a push-pull modulator. The electric vector millimeter wave generating system includes a digital signal processor, an external cavity laser, a push-pull modulator and a DC bias voltage source; the digital signal processor The output terminal of the first analog-digital converter and the second analog-digital converter are connected, and the output terminals of the first analog-digital converter and the second analog-digital converter are respectively connected with the first radio frequency driver and the second radio frequency driver, push-pull The first phase modulator and the second phase modulator in the modulator are respectively connected to the output ends of the first radio frequency driver and the second radio frequency driver, and the output ends of the push-pull modulator are sequentially connected with an optical amplifier, an optical filter, a photodetector and a millimeter-wave amplifier, the output of the millimeter-wave amplifier is connected with an antenna for transmitting electric vector millimeter-wave signals. The invention can be effectively applied in ROF communication to generate wireless electric vector millimeter wave signals, has good use effect and is convenient for popularization and use.
Owner:XIAN UNIV OF POSTS & TELECOMM
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