88 results about "Compact range" patented technology

The invention provides a feed source locating and focus offset device for compact range measurement. The device is used for precise location and focus offset motion of a feed horn in an electromagnetic measurement process of a compact range. The device mainly comprises left and right transverse movement along the X axis, front and back longitudinal movement along the Y axis, rotation and translation around the Z axis and pitching movement around the phase center of a feed source. Accurate locating and focus offset of the feed source are realized through movement of five freedom degrees, and focus offset measurement is completed. By means of servo control, polarization rotation and uniform rotation at a certain rotation speed of the feed horn can be realized, and RCS (radar cross-section) measurement or antenna measurement is completed. The device comprises an X-axial moving unit, a Y-axial compensation unit, a Z-axial rotating and height adjusting unit, an offset arm, a feed source pitching unit and a feed source polarization unit. Different from a fixed feed source locating device, the device can not only be used for precise location of the feed source during measurement of the compact range in a traditional manner, but also be used for measurement of new demand ways such as focus offset and the like; the device has the advantages of high measurement efficiency, high locating precision and simple and reliable control process.

A method for measuring a compact range antenna by three reflectors comprises the following steps of: determining a system mapping function according to the distribution of a feed source field and the distribution of a system outlet field; tracking and analyzing the electromagnetic wave emitted by the feed source by adopting a dynamic waveband tracking theory; and determining all mirror surface parameters of a first forming auxiliary reflector and a second forming auxiliary reflector by the system mapping function, the feed source field wavefront parameters and the main reflector surface parameters. The embodiment of the invention also discloses a system for measuring compact range antenna by three reflectors. The system and the method can be applicable to the feed source higher than 300GHz, and lead the system outlet field to have large quiet zone utilization coefficient (achieving more than 70%), high cross polarization isolation degree, compact structure and wide measurement frequency bands.

The invention discloses a compact range antenna measuring system which comprises a feed source which is arranged in a microwave anechoic chamber and a planar wave generation unit formed by a plurality of meta-material layers which are overlapped with one another, wherein each meta-material layer comprises a substrate and a plurality of artificial hole micro-structures on the substrate; and electromagnetic waves generated by the feed source are converted into planar electromagnetic waves after passing through the planar wave generation unit. A reflecting surface in the prior art is replaced by the planar wave generation unit made from meta-materials, and the refraction characteristics of the planar wave generation unit are simulated by a computer according to test requirements, so that an antenna testing turntable is provided with a quasi-plane-wave testing area with excellent performance after the electromagnetic waves generated by the feed source are refracted by the planar wave generation unit. Thereby, the manufacturing of a high-precision reflecting surface and a high-difficulty processing technique are omitted, and thus the manufacturing cost of the compact range antenna measuring system is greatly reduced.

The invention relates to a holographic reflective array compact range. The holographic reflective array compact range is composed of a feed source, a reflective array antenna and edge teeth, wherein the feed source is fed forward and is vertically irradiated on the reflective array antenna, the reflective array antenna corrects spherical waves emitted by the feed source into plane waves at a close distance, and through caliber layout and inhibition of edge diffraction via the edge teeth, a specific plane wave dead zone is generated so that the far-field condition demand of an antenna pattern or a target RCS test is satisfied. According to the invention, the processing precision of the reflective array antenna is lower than a conventional reflection plane by one order of magnitude, a printing structure is employed, the structure is portable, the manufacturing is simple, the installation is convenient, the manufacturing cost can be decreased, and the holographic reflective array compact range is suitable for low-cost construction of a radiation or scattering test system of a millimeter wave / submillimeter wave band.

The invention relates to a low frequency octave wide wave beam compact range feed source based on medium loading. A ridge waveguide part cooperates with the ridge curve of a horn, which can widen thethickness of the ridge to the most extent. A feed probe is a semi-rigid coaxial cable feed joint (8) which is connected by SMA joints, and the two feed probes are vertically arranged, and are respectively corresponding to two polarizations of the feed source. The terminal position at the oral surface of the ridge curve is disposed in a horn oral surface but not at the edge of a horn wall (1), which effectively reduces the distribution area of a high frequency antenna oral surface without affecting the low frequency antenna oral surface. The invention is advantageous in that a rather small hornopening angle is adopted, and the phase difference of the high frequency oral surface field can be further reduced; through optimizing the shape of medium loading materials and the relative positionof a quadruple-ridged horn, the radiation electric field of feed source antenna can be concentrated in the medium area, and the wave beam can be widened and the phase center can be stabilized; the medium loading quadruple-ridged horn antenna is small in volume, light in weight, and low in cost.

A radio-frequency-device test range (the Refractive Compact Range) includes a physical space having a source zone for placing an antenna or array of antennas, and a test zone for placing a sensor or other device to be tested. A lens and an apodizer are placed in the physical space between the source zone and the test zone. The lens serves to collimate radiated energy emanating from the antenna toward the test zone. The lens may have a surface treatment, such as an anti-reflective coating or a surface pattern, on one or both surfaces. The apodizer functions to keep energy from diffracting off the edge of the lens and getting into the field of view (the test zone). The sensor or other device to be tested may be placed on a moveable mount to allow it to be moved, to simulate relative movement of the device and a radio frequency source, such as radiated by an antenna.

The invention discloses a Terahertz compact range test system based on an electronic scanning antenna. The system comprises a dark room, a target to be tested, a fixing device, a vector network analyzer, a Terahertz vector network expansion module, a computer, an electronic scanning antenna and a feed module; both the electronic scanning antenna and the feed module are positioned in the dark room;the electronic scanning antenna and the Terahertz vector network expansion module are in control connection via the feed module. According to the abovementioned mode, a miniature, quick and convenient Terahertz compact range with low cost can acquire the radar reflection section of the target to be tested or the distant field directional diagram of the antenna to be tested, the brand new active electronic scanning antenna is used for replacing the original emitting surface or holographic grating, so that the system cost is reduced, the using space is reduced, and meanwhile, the miniature compact range quick test capacity is provided.

The invention discloses a laser compensation method for high-frequency linear phase detection of plane wave of a compact range. The laser compensation method comprises the following steps: building a three-dimensional rectangular coordinate system in a dark chamber of a compact range to be detected; determining an initial position of a scanning frame according to a relation between position of a feed source, position of a reflective surface and position of a test area; adjusting a vertical attitude angle and a horizontal attitude angle of the scanning frame and enabling phase detection trend to meet the requirement on the performance of the plane wave; arranging a laser target on a probe antenna of the scanning frame, arranging a laser tracking instrument between the scanning frame and the reflective surface, capturing the position of the laser target in real time by the laser tracking instrument to obtain position information and position deviation delta x of the scanning frame; obtaining a phase deviation result of the plane wave according to a relation between light speed, working frequency and phase, and compensating the deviation result into a phase detection result in real time. The laser compensation method can be used for meeting the requirements on phase detection of the plane wave of the compact range at the high frequency and improving the phase detection accuracy of the plane wave of the compact range.

The present application teaches an implementation of an ultra-compact range sensor based on aperture varying passive depth from defocus. An embodiment of the present application teaches a range sensor, which is a fast LCD matrix that allows the acquisition of a plurality of images with variable focal levels by changing the size of the aperture of a typical lens. The range sensor of the present application may be implemented in mobile devices or used in the construction of medical endoscopes able to perform depth recovery.

The invention relates to a millimeter wave multi-feed-source compact range testing system which comprises nine millimeter wave feed sources (1, 2, 3, 4, 5, 6, 7, 8 and 9) at different positions, a reflecting surface (10), a turntable system (11), a direct leakage baffle (14), an antenna to be tested (15) and a reference antenna (16). The phase center of the central feed source is located at the focus of the reflecting surface, the other eight feed sources are located near the focus, and the relative position of each feed source and the central feed source is determined according to the position of a dead zone, the deflection angle of the dead zone and the geometric dimension of the reflecting surface. When millimeter-wave antenna measurement is carried out, directional diagram testing canbe carried out on an antenna at multiple angles at the same time by rapidly switching the working states and polarization modes of different feed sources, and the testing efficiency of the millimeter-wave antenna is greatly improved.

The present invention relates to a wired testing method of intelligent antenna DOA estimation performance. By utilizing a vector direction diagram of an antenna, the response of an intelligent antenna to a direction of arrival (DOA) is expressed as normalized amplitude and phase distribution of array unit output, the normalized amplitude and phase distribution is realized by using a real amplitude adjuster and a real phase regulator, the amplitude adjuster and the phase regulator with realization of the normalized amplitude and phase distribution are inserted into an intelligent antenna system, the real simulation of the direction of arrival is realized, and DOA estimation performance (including direction of arrival estimation, beam reinforcement or zeroing performance) of the intelligent antenna is determined through a wired test. According to the testing method, no far field or compact range field condition is needed in testing and verification of the DOA estimation performance, requirements to a field and an environment are low, the difficulty of application is reduced, the actual performance of intelligent antenna can be reflected more truly, and the method has wide applicability and popularization and application value.

The invention provides a compact large-framework-angle conformal optical system. After light passes through a rectifying cover and reaches a cylindrical-surface correcting lens, the phase position of the light can be corrected through the cylindrical-surface correcting lens, the light passing through the cylindrical-surface correcting lens is emitted out through an imaging lens set, and the light emitted out through the imaging lens set is subjected to eco-planar imaging on a detector after passing through a diaphragm; the cylindrical-surface correcting lens, the imaging lens set and the diaphragm rotate around a rotating center of an optical axis of the rectifying cover, an alpha angle is formed between the cylindrical-surface correcting lens and the z axis, as well as between the imaging lens set and the z axis, and between the diaphragm rotate and the z axis, meanwhile, the cylindrical-surface correcting lens rotates around the optical axis z' of itself, the rotating angle in the clockwise direction is beta, beta=f(alpha), and when different target view fields are imaged through the optical system and the optical system respectively rotates at the angle of alpha and at the angle of beta, complete imaging of objects in the target view fields is achieved. The requirement for performing detection and tracking objectives within the range of a large framework angle (>=100 degrees) can be met by the system, and the optical system can be extensively used.

A method for operating a flash memory device. The memory device includes a matrix of memory cells each one having a programmable threshold voltage defining a value stored in the memory cell. The method includes the steps of erasing a block of memory cells, and compacting the threshold voltages of the memory cells of the block within a predefined compacting range, wherein the step of compacting includes: selecting at least one first memory cell of the block for writing a target value; restoring the threshold voltage of a subset of the memory cells of the block to the compacting range, the subset including the at least one first memory cell and / or at least one second memory cell of the block being adjacent to the at least one first memory cell; and at least partially writing the target value into the at least one first memory cell.

The invention discloses a single reflecting surface compact range device of high cross polarization isolation. The device is mainly composed of a reflecting surface of a single reflecting surface compact range, a feed source and a polarization grid. The feed source illuminates the precise reflecting surface of the single reflecting surface compact range and beforehand collimates and corrects spherical waves into planar waves. To lower shielding of the feed source, an offset feed structure is adopted in geometric layout, while the offset feed layout is the main reason of large cross polarization. The polarization grid is arranged in front of a planar wave silent area of the single reflecting surface compact range, and a silent area range is subjected to polarization filtering and gating, wherein the polarization states of the feed source and the polarization grid are controlled by respective controllers. Polarization and gating of the polarization grid have the advantages of wideband working, can almost completely reflect the polarization component parallel to polarization grid silk, almost completely transmit the polarization component perpendicular to the polarization grid silk and improve the polarization isolation of the single reflecting surface compact range to a great extent with the cost of introducing very small insertion loss. The engineering achievability of compact range system design is improved, and control over the dynamic range of a radio frequency system is improved.

The invention discloses a method for determining a radar target characteristic measuring synchronous scattering point area of a compact range. The method comprises the following steps: building a three-dimensional rectangular coordinate system in a dark chamber of the compact range; determining position of a feed source of the compact range in the three-dimensional rectangular coordinate system; determining position of a reflective surface of the compact range according to the position of the feed source of the compact range and position of a test area; taking the position of the feed source of the compact range as a circle center and taking a furthest distance and a shortest distance generated when reflection wave of the feed source of the compact range is reflected by the reflective surface of the compact range and directly arrives at a target to be tested in an area to be tested as semi-diameter to build two spherical surfaces in the dark chamber of the compact range; forming a synchronous scattering point area by using the two spherical surfaces and a space between the two spherical surfaces. The method can be used for quickly finding a maximum synchronous scattering point area in the compact range with scattering signals which have interference effects and arrive at the feed source of the compact range simultaneously with scattering signals of the target to be tested.

A compact range antenna test system provided by the present invention comprises a microwave anechoic chamber, and a first manipulator, a second manipulator, a reflector and a feed source which are all arranged in the microwave anechoic chamber, the reflector is arranged on the first manipulator, the feed source is arranged on the second manipulator and faces the reflector, the reflector is used for focusing emergent waves emitted by the feed source into plane waves and reflecting the plane waves to a to-be-tested piece to form a quiet zone, the first manipulator can drive the reflector to move, and the second manipulator can drive the feed source to move according to the moving position of the reflector so as to translate the quiet zone. According to the compact range antenna test system provided by the invention, the reflector and the feed source are respectively driven by the first manipulator and the second manipulator to move, and translation of the quiet zones can be realized by combining real-time matching and alignment of the reflector and the feed source, so that a plurality of quiet zones which can be mutually spliced are formed, the space of the quiet zones is multiplied, and the test performance is improved.

The invention relates to a material compacting device for a similar material simulation test and a using method. The material compacting device is particularly suitable for a similar material simulation test in the fields of mining engineering and geotechnical engineering. The device consists of a pressurizing plate, a dual-acting hydraulic jack, a dual-acting hydraulic jack base, a hand-operated spiral lift and a hand-operated spiral lift base. The hand-operated spiral lift is controlled to enable the pressurizing plate and the dual-acting hydraulic jack to descend to a suitable position above a testing material, the dual-acting hydraulic jack is controlled to enable a piston of the dual-acting hydraulic jack to vertically move repeatedly, and the pressurizing plate is driven to repeatedly compact the test material. The material compacting device is high in resetting speed and large in pressure, can meet requirements on repeated pressurizing to the test material, and is good in material compacting effect; the compacting range is large, the compacting speed is high, the labor intensity is reduced, and the test efficiency is improved; and the material compacting device is simple in structure, convenient to implement, high in maneuverability, convenient to control and low in manufacturing and repairing cost.

The invention provides an element antenna phase center measuring method in an antenna array. The method is characterized in that a converting relation between a phase center position in the compact range and the phase difference among elements in the array and a relation between an array output power which is directly measured through the compact range and the phase difference among the elements in the array are derived; furthermore the compact range is used for directly measuring an array antenna combined output power; deriving the phase difference between unit antennae in the array accordingto a measuring result and further deriving a unit phase central position in the array. Through the measuring method of the invention, the phase center position of the unit antenna in the array can bemeasured.

The invention discloses a millimeter wave terminal test system based on extended compact range test, and also discloses a corresponding millimeter wave terminal test method. The test system comprisesa wave-absorbing darkroom, a turntable controller, a plurality of feed antennas and a plurality of reflectors; the feed antenna and the reflector are distributed in the wave-absorbing darkroom, and the turntable controller controls the tested millimeter wave terminal to rotate in the horizontal direction and the vertical direction; multi-beam signals are dynamically generated between the pluralityof feed antennas and the plurality of reflectors and are used for testing the performance of the millimeter wave terminal. The performance limitation of an existing compact range testing system is broken through, and application and popularization of 5G are facilitated.

The invention discloses a compact range generation device. The compact range generation device comprises a feed source and a metamaterial panel which is arranged above the front part of the feed source, wherein the metamaterial panel comprises a core layer and impedance matching layers which are symmetrically distributed on the surfaces of two sides of the core layer; the core layer comprises a plurality of core layer laminates which are equal in thickness and equal in refractive index distribution; each core layer laminate comprises a first base material which is sheet-like and a plurality of first artificial microstructures which are arranged on the first base material; and the refractive index distribution of the core layer laminates is designed to accord with certain conditions, so electromagnetic wave which is sent by the feed source can be emitted in a plane wave form through the metamaterial panel. According to the compact range generation device provided by the invention, the conventional parabolic reflecting surface is replaced by the sheet-like metamaterial panel. The compact range generation device is easy to manufacture and process and low in cost.

The invention relates to a feed network-based low-frequency compact range feed source, which comprises an ultra-broadband orthogonal dipole antenna (1), a feed network (2), a reflective plate (3), an elliptic cylinder opening surface (4), a support structure (5), a flange plate (6) and a wave-absorbing material (7). The feed source constructs a relatively stable feed source radiation pattern by the elliptic opening surface with a specific length-width ratio, and achieves the characteristics of relatively large 3dB beam width of a horizontal direction pattern and relatively small 3dB beam width of a vertical direction pattern on two different incident polarizations. By introducing a broadband feed network, the length of a feed source horn is greatly reduced. Ultra-broadband oscillators are excited through the feed network; and <e>TE<11> and <o>TE<11> modes with higher mode purity are excited. A support post with a certain length is configured behind the horn antenna of the feed source; the opening surface of the horn antenna is far away from a feed source bracket; a wave-absorbing material with a specific size is added to the bottom part of the support post; and multiple radiation caused by a complicated metal structure of the feed source bracket is inhibited. The feed source mainly works at a low frequency; and the specific frequency range is (300MHz-500MHz).

The invention discloses a compact range collimator based on a plane wave synthesis technology and an optimization method thereof. The collimator is a plane wave comprehensive array antenna, based on the array near-field synthesis technology, the feed amplitude and the phase of each antenna unit in the plane wave comprehensive array antenna are controlled by adopting a particle swarm optimization algorithm to generate quasi-plane waves required by testing, and a dead zone is realized in a darkroom. The plane wave comprehensive array antenna adopts a rotational symmetry structure and is providedwith a parasitic unit and a decoupling structure; the plane wave comprehensive array antenna comprises an antenna array surface, the antenna array surface comprises a plurality of antenna units. According to the array near-field synthesis technology, plane wave synthesis is carried out by using a near-field directional diagram of each antenna unit in the plane wave synthesis array antenna, and array near-field synthesis is carried out by using the in-array near-field directional diagram considering the coupling effect between array elements. The collimator is advantaged in that the collimatoris high in convergence efficiency, good in optimization effect and high in design precision, and an ideal quiet zone is achieved in a large frequency band.

The invention discloses an antenna-feed compact range device mainly composed of a compact range reflection surface, an adaptive positioning feed source, a laser tracker and a microwave darkroom. The compact range reflection surface is a quadric surface. An increase in the size of the reflection surface causes a quadratic increase in the two-dimensional bending offset of the reflection surface, andthus aggravates structural deformation and long-term creep caused by self-weight, and reduces the structural stability and the profile accuracy of the reflection surface system. According to the antenna-feed compact range device, the reflection surface is a recumbent structure, and the feed source is configured in antenna-feed arrangement, which is beneficial to improving the structural stabilityand the profile accuracy of a super large-scale compact range reflection surface system and the plane wave quality of a compact range dead zone.

The invention discloses a rectangular coordinate scanning frame system and a splicing measurement method. The rectangular coordinate scanning frame system comprises a scanning frame vertical movementmodule, a scanning frame vertical fixing module, a scanning frame horizontal movement module, a scanning frame linear translation module, an adjusting sizing block, flatness measurement equipment, a level meter and a wave-absorbing material. The rectangular coordinate scanning frame system solves the problems of poor compatibility and expandability and inconvenient repeated utilization of the scanning frame system for detection in the prior art because the scanning frame system belongs to measuring equipment and needs to be dismounted after detecting the performance of a dead zone, solves theproblem of universality of a planar scanning frame system in performance detection of large and ultra-large compact range dead zones, and can adapt to the demand of a larger stroke through an unlimited splicing mode. In addition, the horizontal module at the original position is kept still all the time in the splicing process, so that the flatness of the original position can be continued in the whole splicing process.

The invention relates to a shared holographic compact range system of millimeter wave / submillimeter wave multi-band calibers, wherein the compact range is mainly composed of a multi-band feedback source system and a holographic caliber transmission surface. The parameters of the holographic caliber transmission surface of the compact range are determined by the central frequency of the multi-band. Parameters such as feedback source position, working frequency and illumination angle and the like, are determined by a generalized similarity principle. The frequency range higher than the central frequency of the feedback source is away from the holographic caliber transmission surface, the field angle of the feedback source is small, the feedback source is close to the holographic caliber transmission surface in a frequency band lower than the central frequency, and the field angle of the feedback source is large.

Disclosed is a steel-belt-type detection device for evaluation of microwave flatness. The steel-belt-type detection device for evaluation of microwave flatness comprises steel belt drive units, support stand pillars, transmission steel belts and a microwave detection platform. The support stand pillars are vertically fixed in the level surface; the top and the bottom of a vertical plane on the same side of two support stand pillars are respectively provided with a steel belt drive unit; each steel belt drive unit outputs a transmission steel belt; the steel belt drive units are connected with the transmission steel belts through the microwave detection platform; and the space position of the microwave detection platform is placed inside a space rectangular plane formed by rotating four steel belt drive units. Because the structural mode that the steel belts are connected in parallel to transmit is adopted, plane three-degree of freedom movement of a measuring probe is achieved. The steel-belt-type detection device for evaluation of microwave flatness is simple in structure and convenient to install and debug, greatly reduces quality of the whole mechanism and section scattering values of radar, and is capable of guaranteeing high measuring accuracy. The steel-belt-type detection device for evaluation of microwave flatness provides a solution which is high in accuracy, flexible and high-efficient for tests of microwave flatness in a compact range.

A radio-frequency-device test range (the Refractive Compact Range) includes a physical space having a source zone for placing an antenna or array of antennas, and a test zone for placing a sensor or other device to be tested. A lens and an apodizer are placed in the physical space between the source zone and the test zone. The lens serves to collimate radiated energy emanating from the antenna toward the test zone. The lens may have a surface treatment, such as an anti-reflective coating or a surface pattern, on one or both surfaces. The apodizer functions to keep energy from diffracting off the edge of the lens and getting into the field of view (the test zone). The sensor or other device to be tested may be placed on a moveable mount to allow it to be moved, to simulate relative movement of the device and a radio frequency source, such as radiated by an antenna.

The invention provides a reflecting surface and a compact range measuring system with the reflecting surface. The reflecting surface comprises a working surface which is used for reflecting sphericalelectromagnetic waves emitted by the feed source antenna and converting the spherical electromagnetic waves into planar electromagnetic waves; a wave absorbing structure which is made of an electromagnetic wave absorbing material, wherein the wave absorbing structure is arranged on the edge of the working surface and is used for reducing edge scattering of the working surface. The reflecting surface provided by the embodiment of the invention can be used for a compact range measurement system. According to the reflecting surface disclosed in the embodiment of the invention, edge scattering canbe reduced, and the dead zone performance of the compact range measurement system is improved.

The invention discloses a multi-probe compact range antenna test system and a generation method. The multi-probe compact range antenna test system comprises an antenna array panel, an antenna radiation unit, a beamforming network, a polarization control turntable, a tested antenna, a test instrument, a multi-axis turntable and a control module; the test system adopts a one-dimensional, two-dimensional and three-dimensional uniform and non-uniform symmetrical distribution arrays, optimizes the number and positions of antenna radiation units through a mapping function, and optimizes and weightsthe amplitude and phase of each unit of the array through a beamforming network, so that spherical waves radiated by each array element are superposed to form a plane wave; high-quality plane waves are generated at a short distance, and near-field measurement of various devices, especially base station antenna testing of 5G communication, is realized.

The invention relates to a compact range device based on a microstrip patch reflective array. The compact range device mainly solves the problems that an existing reflective compact range device is high in cost and large in machining difficulty. The antenna comprises a feed source (1) and a microstrip patch reflective array antenna (2), the feed source adopts a horn antenna and is located above one side of an aperture of the microstrip patch reflective array antenna to emit spherical electromagnetic waves, the reflective array antenna converts the spherical electromagnetic waves into emergent plane waves, and a plane wave dead zone (3) is formed after the distance between the emergent direction and the aperture of the microstrip patch reflective array antenna is 6 times of the aperture of the microstrip patch reflective array antenna. The microstrip patch reflective array antenna comprises a dielectric plate (21), a metal reflective floor (22) and a plurality of reflective array units (23), the edge of the dielectric plate adopts a stepped structure, all the reflective array units are arranged on the surface of the dielectric plate according to a fixed period, the dielectric plate and the metal reflective floor are arranged in parallel up and down, and an air layer (24) is formed between the dielectric plate and the metal reflective floor. The device is small in size, light in weight, easy to install, low in manufacturing and maintenance cost and capable of being used for low-cost scenes.