24 results about "Compact range" patented technology

The application discloses a multi-circle gradually-changing impedance edge loading tight field device, which is a novel device different from traditional sawtooth tight field and edge curl tight field. The device sprays conductive paint with gradually-changing impedance on the edge of a parabolic surface in multiple circles, and controls the impedance value of the conductive paint in the gradually-changing manner. Compared with common sawtooth edge processing and edge curl processing, the design of the multi-circle gradually-changing impedance does not need to process the edge shape into sawtooth or curve, but only needs to load impedance on the edge surface of the parabolic reflecting surface, so that the processing steps of the tight field reflecting surface are greatly simplified, the processing difficulty is reduced, and the cost is saved. The device disclosed by the application fully meets the performance indexes of the tight field, can be used as an upgrade and substitution of the existing tight field product, and is one of the development trends of future low-frequency test fields.

The utility model provides a multi-band compatible compact range antenna test system which comprises a bottom plate, a feed-in antenna is fixedly mounted on the upper surface of the bottom plate, a fixing column is arranged on the upper side of the bottom plate and located on the left side of the feed-in antenna, a reflection panel is arranged on one side of the fixing column, and a connecting mechanism is arranged between the reflection panel and the fixing column. A mounting mechanism is arranged in the connecting mechanism, an electric lifting rod is fixedly mounted at the position, located on the right side of the feed-in antenna, of the upper surface of the bottom plate, a fixing frame is fixedly mounted on the upper surface of the electric lifting rod, and a clamping mechanism is arranged in the fixing frame. Through the arrangement of the connecting mechanism, the sliding rail and the moving block, the hydraulic rod is driven to cooperate with the fixed rod to adjust the angle of the reflection panel, the moving block slides on the surface of the sliding rail, the position of the reflection panel can be adjusted, and the test requirements of a multi-band antenna can be met.

The invention discloses a high and low temperature compact range darkroom satellite-ground link real-time simulation verification system, and belongs to the technical field of aerospace testing. The system comprises a compact range darkroom, an integrated high and low temperature control subsystem, an integrated cooperative control and link simulation subsystem, a radio frequency test subsystem and a mechanical support subsystem. The core innovation of the device is as follows: a polymethacrylimide (PMI) foam material with a dielectric constant close to that of air is adopted to integrally construct a closed temperature control cavity, so that electromagnetic measurement errors introduced by a traditional medium window at high and low temperatures are thoroughly eliminated; and through a high-precision synchronous control technology, wide-temperature-range environment simulation, phased array terminal calibration and dynamic satellite-ground communication link simulation are deeply integrated and synchronously carried out. According to the method, the real, efficient and closed-loop verification of the functions and performance of the satellite-ground communication system is realized in an equivalent in-orbit temperature environment, the test precision, authenticity and efficiency are remarkably improved, and the development of high-reliability spacecrafts is powerfully supported.

The application discloses a high-performance three-mirror compact range antenna measurement system based on NURBS, combines a non-uniform rational B-spline curve surface fitting algorithm with a terahertz three-mirror compact range design, gives a new application of the non-uniform rational B-spline modeling technology according to electromagnetic background and aperture field distribution of a terahertz frequency band, realizes shape conversion of a beam aperture section from a circular shape to a square shape, takes into account the advantages of the B-spline, can realize free distribution of a grid, obtains a shaped surface of a compact range aperture meeting requirements, and solves the adaptation problem of the non-uniform rational B-spline in the shaping surface design process of the three-mirror compact range. In addition, in the process of the three-mirror compact range design, a good energy mapping condition is explored, the energy attenuation relationship function of the edge of a quiet zone is optimized by adjusting light and a propagation path, the energy dispersion problem caused by diffraction of light at the edge of a primary mirror is further solved, and the performance of the whole three-mirror compact range system is improved.

The invention relates to the technical field of target scattering characteristic testing, in particular to a compact range double-station RCS plane scanning testing method and system. The system comprises a transmitting antenna, a double-cylindrical-surface reflecting surface module, a plane scanning frame, a receiving antenna, radio frequency receiving and transmitting equipment and a test computer. According to the method, a mode of combining single compact range plane wave irradiation and plane scanning near field receiving is adopted. The transmitting end forms a plane wave in a quiet zone through the double-cylinder compact range to irradiate a to-be-measured target; the receiving antenna is driven by the plane scanning frame to scan in a two-dimensional plane and acquire a target near-field bistatic scattering signal; and the test computer processes the signal based on a near-far field transformation algorithm, and performs inversion to obtain the far-field double-station RCS of the target. According to the method, a receiving end compact range is replaced by plane scanning, the system cost, complexity and site requirements are remarkably reduced, and the prominent problems that a traditional indoor double-station RCS test technology is difficult to implement and high in cost are solved.

The invention provides a micron-sized adjusting mechanism for accurately positioning and adjusting a high-precision reflector antenna, which is characterized in that a hollow motor is mounted on a supporting threaded rod of a compact thread differential adjusting mechanism, and a set of annular structure for realizing high-precision displacement through differential threads is tightly placed between the hollow motor and the threaded rod; the front end and the rear end of the adjusting mechanism are each provided with a ball head structure, so that the adjusting mechanism and the panel have the self-adaptive capacity in the assembling process. The compact thread differential adjusting mechanism achieves six-degree-of-freedom adjustment, and the precision requirements of the compact range panel in different installation and adjustment stages are met through manual coarse adjustment and electric fine adjustment. Space is fully saved, the hollow servo motor is used, the gap between the hollow servo motor and the shaft is utilized, two pairs of differential threads are designed to be matched, micron-sized Z-direction high-precision movement is achieved, and the assembling requirement of a compact range is met. And meanwhile, high bearing capacity, high adjustment resolution and long-term operation stability and reliability are achieved.

The invention discloses a compact range dead zone amplitude and phase testing method based on a reference target method, and belongs to the technical field of microwave measurement. According to the method, a mathematical relationship between a target scattering field and a target surface induction current is established, a conductor rod is used as a reference target, and one-dimensional transverse distribution of any target is represented by rotating the conductor rod around the center of the reference target. According to the compact range quiet zone amplitude and phase testing method based on the reference target method, radar cross sections RCS of a reference target under different azimuth angles are measured, compact range quiet zone amplitude and phase distribution is obtained through data processing inversion, and dependence on a complex and time-consuming probe scanning device is not needed. Wherein the reference target is a metal rod or a cylinder of which the length is greater than the range of the quiet zone, and the surface field distribution of the reference target and the RCS essentially form a Fourier transform relationship. The method effectively simplifies the test process of the quiet zone, improves the test efficiency, and is suitable for rapid and accurate evaluation of the performance of the compact range quiet zone.

The present application relates to the technical field of microwave test, and more particularly to a support structure for tight-field RCS test in terahertz frequency band, comprising a support frame, a reflection surface mounting and adjusting part and a feed seat. The support frame comprises a vertical section and a horizontal section, the lower end of the back frame of the reflection surface is connected with the follow-up adjusting support through the vertical section, one end of the telescopic pull rod is hinged with the vertical section, and the other end is hinged with the upper end of the back frame, when the telescopic pull rod is telescoped, the back frame rotates relative to the follow-up adjusting support. The feed antenna is mounted on the pitch adjusting part through the horizontal adjusting part, the pitch adjusting part is mounted on the horizontal section, the horizontal adjusting part drives the horizontal movement of the feed antenna, and the pitch adjusting part is used for adjusting the pitch angle of the feed antenna. The support structure adjusts and fixes the reflection surface through the telescopic pull rod and the follow-up adjusting support, adjusts the position and angle of the feed antenna through the horizontal adjusting part and the pitch adjusting part, ensures that the feed antenna is located at the focal point of the reflection surface, and makes the test more accurate.

The present application relates to the technical field of multi-channel compact range antenna test system, and discloses a compact range high-precision multi-feed source translation switching device, which comprises a translation mechanism, a support frame and a feed source support, the support frame top platform is provided with the feed source support, the translation mechanism adopts ball screw transmission, the side is provided with a range finder and an induction block as a phase center positioning auxiliary, and the mounting position on the feed source support covers different frequency feed sources. The device automatically switches full-band P~Ka feed sources through process control translation shaft movement, and through multi-dimensional adjustment of the fine adjustment mechanism and the polarization shaft, the wide-band coverage and high test precision requirements in complex scenes are met, and the device is suitable for multi-channel parallel test scenes.

The invention relates to the technical field of compact range testing, and discloses a compact range testing low-frequency transmitting antenna supporting device which comprises a support, a lifting base and an antenna mounting seat, the lifting base is movably arranged on the support in the first direction, the first direction is consistent with the height direction of the support, and the antenna mounting seat is arranged on the lifting base. And the antenna mounting seat is arranged on the lifting base in an angle adjustable manner by taking a second direction as an axis, the second direction is perpendicular to the first direction, and a mounting position is arranged on the antenna mounting seat and is used for mounting a transmitting antenna. And lifting and polarization conversion of the transmitting antenna are realized.

The invention provides a method for quantifying the influence of amplitude-phase tapering of a quiet zone on antenna radiation characteristic parameters, and the method comprises the steps: measuring the scattering data of a standard antenna based on a preset position point of the quiet zone of a compact range, and obtaining the actual measurement statistical characteristics; constructing a function model for describing coning distribution on the basis of the actually measured statistical characteristics, wherein the function model describes the relationship between amplitude coning and phase coning of the quiet zone and the spatial position; correcting an amplitude weight and a phase weight of the antenna array unit to be measured based on the function model; calculating a corrected array factor and a total directional diagram according to the amplitude weight and the phase weight; and determining a radiation characteristic parameter difference value of the to-be-tested antenna according to the corrected array factor and the total directional diagram. According to the invention, the influence of the amplitude-phase tapering of the quiet zone on the radiation characteristic parameters of the antenna is quantified, and simulation analysis based on numerical values can be realized.

The invention discloses a double-station RCS (radar cross section) scaling test system and a test method for an electrically large-size target in an indoor compact range. The system comprises a transmitting feed source, a receiving feed source, a transmitting compact range parabolic reflecting surface, a receiving compact range parabolic reflecting surface, a transmitting compact range movable bracket, a receiving compact range movable bracket, a target to be measured, a target placement turntable, a vector network analyzer, a three-port power divider and a control and data processing center, the to-be-measured target comprises two types: one type is a calibration body, and the other type is a scaling target model; and calculating and processing to obtain an RCS value of the scaled target model through a known RCS of the calibration body, a receiving feed source output intermediate frequency signal obtained by measurement of the calibration body and a receiving feed source output intermediate frequency signal obtained by measurement of the scaled target model by utilizing a substitution method. The system is simple in structure and convenient to install, and the testing efficiency is improved.

The invention relates to a Terahertz compact range darkroom target supporting device, and relates to the field of supports, the Terahertz compact range darkroom target supporting device comprises a two-dimensional rotating top capable of adjusting the azimuth direction and the pitching direction, a supporting table fixedly connected to the two-dimensional rotating top and a clamp erected on the top of the supporting table, the supporting table is a circular table made of polytetrafluoroethylene, and the outer diameter of the bottom of the supporting table is larger than that of the top of the supporting table; the top of the support table is lower than the dead zone center; the clamps are of an L-shaped structure, the horizontal ends of the multiple clamps are connected with the top of the supporting table, and the right-angle ends of the clamps are connected with the target. The target posture adjusting device has the advantages that the flexibility and reliability of target posture adjusting are improved, and a good foundation is laid for multi-state testing of the target.

The present application relates to a kind of stepped inverted ridge structure short axial length dual-polarized compact range feed antenna, wherein inverted ridge fin part adopts stepped fin, cooperate with small angle of aperture conical waveguide structure can effectively expand working bandwidth, compress horn axial length, reduce voltage standing wave ratio;Feed probe adopts four standard coaxial connector connected coaxial cable;Feed uses horn design with axial slot, can realize beam with wideband equalization, stable phase center and low cross polarization, after optimization, feed full-band realizes voltage standing wave ratio less than 1.5.The four-ridge horn feed has the outstanding advantages of simple structure, small size, light weight and low cost.

The invention discloses a compact range reflecting surface constant-temperature design method, belongs to the technical field of compact range reflecting surface design, and designs a compact range reflecting surface constant-temperature device which synchronously designs the appearance and size at the beginning of reflecting surface design. A vapor chamber with a capillary effect and conducting liquid is arranged in the compact range reflecting surface constant temperature device, and a semiconductor sheet and a temperature measuring sensor are arranged on the vapor chamber every 10-30 cm. A temperature-voltage feedback circuit matrix is designed, and positive and negative electrodes of all semiconductor chips and a probe interface of a temperature measurement sensor are connected to a control matrix. The invention designs a compact range constant-temperature technology, particularly a compact range reflecting surface constant-temperature technology which greatly reduces energy consumption compared with a traditional darkroom constant-temperature technology, and through the technology, constant temperature of the compact range reflecting surface is realized under the condition that the energy consumption is reduced, so that deformation of a metal reflecting surface is reduced, and the surface precision of the reflecting surface is guaranteed; therefore, the stability of the amplitude-phase characteristic of the dead zone is ensured.

The invention relates to the technical field of testing, in particular to a compact range testing system based on OTA millimeter waves, which comprises a box body, a heat dissipation device is arranged in the box body, a porous supporting platform is fixedly mounted in the middle of the inner side of the box body, a testing box is mounted at the upper end of the porous supporting platform, the heat dissipation device comprises a rectangular through groove, and the rectangular through groove is formed in the middle of the upper end of the box body. A blast assembly is installed at the bottom of the box body, the upper end of the blast assembly is fixedly connected to the lower end of the driving assembly, air guide through grooves are symmetrically formed in the positions, close to the upper end, of the left side wall and the right side wall of the box body, and dust screens are installed in the air guide through grooves; an arc-shaped air guide plate is fixedly connected to the upper end of the interior of the air guide through groove, the box body capable of dissipating heat of the test box is arranged on the outer side of the test box, continuous cold air flow can be provided while heat dissipation is conducted, and therefore the running smoothness and stability of the test box are guaranteed.

The application discloses a kind of fast and efficient array beam deflection angle calibration methods for equivalent isotropically radiated power test, including pre-calibration stage and calibration stage;Pre-calibration stage, a standard antenna under test is used as reference, placed in the quiet zone of compact range;In the case of unfocused feed, rotate reference 0 and 20, record the two sets of data;In the case of defocus, rotate reference 0, θ m , 30 and get the corresponding S 21 , record the three sets of data;Get the expression of two deflection angle fitting functions;Calibration stage places the problematic device in the quiet zone of compact range, and positions the feed according to the feed deflection angle 0, 20, -20, respectively, to obtain the corresponding S 21 ;The three sets of test values are brought into the unfocused compact range angle power fitting function and the defocused compact range angle power fitting function, to obtain the peak deflection angle and deflection direction of the problematic device.The application realizes the angle calibration of production line test equipment, with the characteristics of convenience and efficiency.

The application discloses a method for improving the performance of a compact range quiet zone by adjusting the feed source deflection angle, and the method comprises the following steps: determining the focal length of a compact range reflecting surface, the deflection direction of the reflecting surface, the size of the quiet zone and the position of the quiet zone; projecting the quiet zone to the reflecting surface to determine the lowest point and the highest point projected on the deflection direction of the reflecting surface; obtaining the feed source directional diagram data through simulation or measurement; rotating the feed source from the lowest point to the highest point, and calculating the amplitude flatness of the quiet zone in the deflection direction of the reflecting surface at different deflection angles by using a geometric optics method; and finding the feed source deflection angle that makes the amplitude flatness minimum by comparison. The application can improve the performance of the compact range quiet zone without changing the compact range reflecting surface, the feed source and the darkroom structure.

The invention relates to the technical field of multi-channel compact range antenna test systems, and discloses a compact range high-precision multi-feed-source translation switching device which comprises a translation mechanism, a supporting frame and a feed source support, the feed source support is installed on a top platform of the supporting frame, and the translation mechanism is driven by a ball screw. A range finder and an induction block are arranged on the side edge to serve as phase center positioning assistance, and installation positions on the feed source support cover feed sources of different frequencies. The device automatically switches the full-band P-Ka feed source through the motion of the program-controlled translation shaft, meets the requirements of broadband coverage and high test precision in a complex scene through the multi-dimensional adjustment of the fine adjustment mechanism and the polarization shaft, and is adaptive to a multi-channel parallel test scene.

This invention discloses a high aspect ratio single parabolic cylindrical compact field system based on a linear array feed, belonging to the field of antenna measurement and compact field technology. The system comprises a high aspect ratio single parabolic cylindrical reflector and a linear array feed located at its focal line. Thanks to the combination of the linear array feed and the single parabolic cylinder, the system avoids complex beamforming designs for high aspect ratio apertures and significantly suppresses the high cross-polarization problem commonly found in offset point source feeds. To address the low-frequency diffraction enhancement problem caused by vertical size limitations, this invention introduces a geometric phase delay design at the reflector edge, i.e., bending the serrated edge backward to introduce phase taper. In the design implementation, the optimal geometric setback at the edge was determined using a numerical optimization method based on the target quiet zone performance. This design, while maintaining the advantages of low cost and ease of fabrication, significantly suppresses edge diffraction, effectively extends the low-frequency operating bandwidth of the compact field, and greatly improves the quiet zone utilization.

The application discloses a high-aperture utilization rate ultra-large quiet zone tight-field device, which comprises a tight-field reflecting surface, a feed source and a plane wave quiet zone; the feed source is an electromagnetic wave radiation source of the tight-field device; a diagonal feed layout is adopted, the vertex of the tight-field reflecting surface is arranged at a position close to the aperture diagonal line, the center of the feed source and the focal point of the reflecting surface are copointed on the virtual rotation symmetry axis of the reflecting surface; the tight-field reflecting surface is a quadric surface structure, the central entity is a rotation parabolic surface part, and is used for correcting the spherical wave radiated by the feed source into a plane wave in the quiet zone; and the plane wave quiet zone is a limited three-dimensional space region which meets the requirement of far-field test after the electromagnetic wave radiated by the feed source is corrected by the reflecting surface.

The invention discloses a Huygens metasurface-based sub-terahertz electric large-size compact range device and a test method, and belongs to the technical field of novel artificial electromagnetic materials, and the device comprises a corrugated horn feed source antenna, a Huygens metasurface array, a clamp of the Huygens metasurface array, and a scanning frame. The Huygens metasurface array comprises a plurality of Huygens metasurface basic unit structures, and each Huygens metasurface basic unit structure comprises a top grid metal layer, a dielectric layer, a middle pattern metal layer, a dielectric layer and a bottom metal grid layer; the top grid metal layer comprises periodical interval grids in the horizontal direction, the middle pattern metal layer comprises split-ring resonators pointing to the diagonal direction, and the bottom grid metal layer comprises periodical interval grids in the vertical direction; the device is suitable for the performance test of the electrically large antenna in the sub-terahertz frequency band. An economic printed circuit board technology is selected, the super surface and the glass substrate are integrated to improve the overall rigidity, the structure is stable, and the design is novel.

The invention discloses a rapid positioning method and device for a compact range feed source phase center, and belongs to the field of electromagnetic measurement. The method comprises the following steps: establishing a three-dimensional coordinate system taking the vertex of a parabolic reflector as an original point and the focal line of the parabolic reflector as an X axis according to a position relationship between the parabolic reflector and a feed source phase center; according to the spatial position relationship among the feed source phase center, the parabolic reflector and the section in the dead zone in the three-dimensional coordinate system, establishing an incident offset focus equation of the feed source phase center; inputting the coordinates of a plurality of preset to-be-observed points on the cross section in the quiet zone into the incident offset focus equation, and calculating and outputting to obtain a coordinate estimation value of a feed source phase center; and calibrating and positioning the feed source phase center according to the coordinate estimation value so as to enable the coordinate of the feed source phase center to coincide with the focus of the parabolic reflector. The feed source phase center can be quickly positioned, and the quiet zone phase performance is improved.