43 results about "Umbrella antenna" patented technology

The invention provides a modularized space parabolic cylinder antenna folding and unfolding mechanism and relates to an antenna mechanism in order to solve the problems that an existing unfolded type parabolic cylinder antenna structure is low in molded surface accuracy, poor in stability and low in integral rigidity, an umbrella antenna structure is not suitable for the structure formed by stretching a reflecting surface, an unfolding truss antenna structure can only be unfolded unidirectionally, and a parabolic cylinder can not be formed. The modularized space parabolic cylinder antenna folding and unfolding mechanism comprises two synchronous folding and unfolding module supports, multiple locating folding and unfolding module supports, a plurality of folding and unfolding arms and a plurality of tensioning pull cords. Each folding and unfolding arm comprises an elastic hinge, two folding and unfolding arm levers and two outer connectors. Each synchronous folding and unfolding module support comprises an outer supporting plate, an inner supporting plate, locking and limiting devices and a rotary connecting device. Synchronous folding and unfolding modules are arranged on the two sides of the multiple locating folding and unfolding module supports respectively. The mounting end of the outer supporting plate of each synchronous folding and unfolding module support and the mounting end of the inner supporting plate of the synchronous folding and unfolding module support are rotatably connected through the corresponding rotary connecting device. The modularized space parabolic cylinder antenna folding and unfolding mechanism is applied to satellites or space stations.

The invention discloses a test system for deformation measurement of a large spacecraft structure under a vacuum and low-temperature environment. The test system includes a vacuum and low-temperature container, a portal supporting mechanism, a low-temperature cantilever moving mechanism, photogrammetry CCD camera and protection cabin assemblies, a test piece supporting mechanism, a low-temperature reference meter, a temperature and air pressure control system, a motion control system, and a measurement data acquisition and processing system; two sets of photogrammetry CCD camera and protection cabin assemblies are symmetrically hung at two ends of the low-temperature cantilever moving mechanism, and 3m-rotation radius and +/-360-degree-reciprocating rotary movement photographing can be realized under the vacuum and low-temperature environment so as to realize the deformation measurement of the large spacecraft structure. With the test system of the invention adopted, the thermal deformation measurement of a certain 5m large umbrella antenna can be completed under a simulated space environment by using photogrammetric techniques, and the repeatability precision of the measurement of spatial point positions can achieve 20 microns.

The invention relates to a foldable expandable umbrella antenna structure framework and an expansion method. The structure framework comprises a foundation, a first level rod, a rotation shaft, a second level rod, a torsion spring, a clamping member, a spring, a rope, a connection rod, a nut and a screw, wherein the foundation is circumferentially connected with the bottom end of the first level rod through the rotation shaft, the top end of the first level rod is in hinge connection with the bottom end of the second level rod through the torsion spring, the clamping member, the spring, the rope and the rotation shaft form the clamping structure, the second level rod is folded and is bent, the top end is clamped in the clamping structure, the lower portion of the first level rod is circumferentially connected with the nut through the connection rod, the nut is mounted on the screw to form a screw nut structure, the nut is driven by the screw to move upwards, the structure framework is folded; the nut is driven by the screw to move downwards, the structure frame is expanded, the rotation shaft rotates to a certain angle, the rope is pulled to open the clamping structure to release constraint, and the second level rod is driven by the torsion spring to open; the structure framework is expanded. The umbrella antenna structure framework has advantages of small folding dimension, large expansion dimension, repeatable folding and expansion, small and light structure and high reliability.

The invention relates to an umbrella antenna unfolding synchronization device and belongs to the space mechanism control technical field. The device includes a base, a rib group and a tension rope group; the base is of a horizontally-placed hollow ring structure; the rib group is fixedly mounted on the upper surface of the base; ribs in the rib group are connected with one another through the tension rope group; when an umbrella antenna is folded, the top ends of the rib group are inwardly contracted to the axis of the base; when the umbrella antenna is unfolded, the top ends of the rib groupare unfolded outwardly to form a petal-shaped structure; the rib group includes n ribs, wherein the n ribs are evenly distributed on the upper surface of the base, n is a positive integer, and n satisfies a relational expression that 20<=n<=28; each rib is of an arc-shaped structure, and the height of the rib ranges from 4700 to 4760 mm; and the spacing of the center points of two adjacent ribs ranges from 280 to 290 mm. With the device of the invention adopted, the problem of the twisting of a main mesh surface and an auxiliary mesh surface caused by the difference of the rotation angles of the ribs during the unfolding process of the antenna can be solved, and the stability of the unfolding of the antenna and the surface precision of the antenna during in-place unfolding are improved.

The invention relates to a high-precision umbrella antenna mesh splicing method and an adaptive splicing device thereof. The method comprises the following steps: firstly, assembling the adaptive splicing device, radially assembling a plurality of arched mesh support components on a base plate, assembling a carbon fiber plate on an upper surface of the outermost mesh support component, and assembling a plurality of pre-tensioning pulleys on the edge of the base plate; before splicing a metal mesh, calculating the tension loaded on the location of each pre-tensioning pulley to determine the weight of counterweights; connecting the counterweights with the corresponding weight to the periphery of the metal mesh through a string, and enabling the string to vertically droop through the corresponding pre-tensioning pulley; and enabling the metal mesh to be overlapped with the carbon fiber plate at the location of the carbon fiber plate, and stitching the metal mesh with the carbon fiber plate to complete splicing. The high-precision umbrella antenna mesh splicing method and the adaptive splicing device thereof disclosed by the invention can meet various functional requirements, are excellent in performance, and can be widely applied to umbrella deployable antennae subsequently.

The present invention discloses a patch integration formula-based umbrella antenna structure optimization design method. The method comprises the following specific steps: inputting the structure parameters and the electrical parameters of an umbrella antenna; calculating the optimal focal length of the umbrella antenna; calculating the segment number of antenna ribs; calculating the coordinates of points on the ribs; calculating the coordinates of points between adjacent ribs; generating all the node coordinates of the umbrella antenna; calculating the coefficient of a patch plane equation; calculating the coefficient of a triangle edge equation; calculating the projection area of the triangle; calculating the axial error of triangle patches; outputting the axial precision of the umbrella antenna; judging whether the axial precision of the umbrella antenna meets the requirement or not; outputting the structure parameters of the umbrella antenna; and updating the structure parameters of the umbrella antenna. According to the technical scheme of the invention, the characteristics of the umbrella antenna spliced by patches are considered. Based on the patch integration formula, the axial precision of the umbrella antenna is analyzed. Therefore, by adopting the method, the mechanical structure design and the electromechanical integrated optimization design of the umbrella antenna are guided.

The invention discloses a large-caliber umbrella antenna deployment mechanism which comprises a driver, a bevel gear set, a support, screw rods, sliders, connecting rods, rib assemblies, springs and stop pins. The support is a hollow cylinder structure. One end of the support is equipped with a driver for providing power, and a plurality of screw rods for transmitting power are arranged inside thesupport. The driver is connected to the screw rods through the bevel gear set, the screw rods are equipped with the sliders which are only in translational motion along the axial directions of the screw rods. The other end of the support is equipped with the rib assemblies for assembling an antenna, the rib assemblies are hinged to the sliders through the connecting rods, and the stop pins for locking the rib assemblies are pressed and installed at the outer side of the support through the springs. Through the cooperation of the driver, the bevel gear set, the support, the screw rods, the sliders, the connecting rods, the rib assemblies, the springs and the stop pins, the synchronous deployment of an umbrella antenna is achieved, a deployment torque is enhanced, a device volume is reduced, the safe and reliable deployment process is ensured, and shortcomings of a traditional umbrella antenna deployment mechanism are made up.

The invention discloses an umbrella antenna oscillator. The umbrella antenna oscillator is characterized by comprising an antenna oscillator main body, wherein the antenna oscillator main body mainlycomprises an umbrella metal sheet, a spiral metal winding and a non-metal support, the umbrella metal sheet and the spiral metal winding are connected, the umbrella metal sheet is fixed on the non-metal support, the umbrella metal sheet is arranged at the top of the antenna oscillator main body and is used as antenna top capacitance loading, and the spiral metal winding is arranged at a middle part of the antenna oscillator main body and is used as antenna middle part inductance loading. The umbrella antenna oscillator is simple in structure, the problems that the umbrella antenna oscillator is excessively large in antenna size and is not attractive when installed on a vehicle are solved, and the problem of poor receiving effect of a low-profile and small-size antenna is also solved.

The invention discloses a mounting method of a metal mesh surface of an umbrella antenna and relates to the technical field of an antenna mechanism. The method comprises the following steps: (1) sequentially adjusting sectors between umbrella antenna ribs through a sewing device; (2), cutting a metal mesh; (3), levelling and laying the metal mesh on the surface of the sewing device, applying a pre-tightening force and fixing the metal mesh; (4), laying an L-shaped dielectric isolation belt; (5), placing and fixing the sewing device in one sector; (6), sewing the metal mesh and the dielectric isolation belt into two umbrella antenna ribs through a sewing thread; (7), repeating steps (3) to (6), and sequentially sewing n-1 sectors; and (8), adjusting the last sector, and repeating the step (3) to (6) to sew the last sector. The mounting method provided by the invention realizes the good electric performance requirement of the umbrella deployable antenna and ensures higher mesh surface accuracy and better tension uniformity.

The invention discloses a flexible parabolic antenna and a curing method of the flexible parabolic antenna. The flexible parabolic antenna is made of an inflatable antenna or an umbrella antenna or an elastic metal antenna, is convenient to store and transport, and is low in anti-wind capacity when used, thereby being seriously limited by usage occasions. According to the curing method of the flexible parabolic antenna, polyurethane plastic foam foaming agent is sprayed on the reflecting surface of the flexible antenna to cure the reflecting surface of the flexible antenna on a use site, the reflecting surface made of flexible materials can be cured in short time, the reflecting surface made of the flexible materials is rigid, when the flexible parabolic antenna is not used, the cured plastic foams are torn off, and the reflecting surface of the antenna can be flexible and can be stored conveniently. Therefore, the reflecting surface of the flexible parabolic antenna can be rigid or soft as needed.

The invention discloses an umbrella antenna random error analysis method considering deterministic error, which comprises the following steps: inputting umbrella antenna geometrical parameter and electric parameter; calculating the optimal focal length of the umbrella antenna; Calculation of Far Area Radiation Electric Field of Ideal Antenna at Optimal Focal Length; Reflector triangular mesh generation; calculating the deterministic error of the umbrella antenna; the first-order and second-order coefficients of the electric field displacement relative to the center point of the element are calculated. The first-order and second-order coefficients of the random error of the electric field relative to the center point of the element are calculated. Calculation of Far Area Radiated Electric Field under Deterministic Error of Umbrella Antenna; RMS value of input surface random error; calculating an average value of the far-field radiation power of the antenna; Judge whether the electricalperformance meets the requirements; Output radiated power pattern; Update the surface random error rms value. By obtaining the influence of the surface random error of the umbrella antenna on the electric performance, the invention can guide the processing and manufacturing of the umbrella antenna components.

The invention provides an integrated forming method of a carbon fiber three-way fabric composite material reflecting surface for an umbrella antenna, which comprises the following steps of: weaving carbon fiber tows into a planar three-way fabric according to a specific interweaving rule, then spraying organic silica gel on the surface of the three-way fabric, paving the sprayed three-way fabric on the surface of an umbrella antenna emitting surface forming mold, and adopting bag pressure room temperature vulcanization molding, wherein the prepared composite material has a series of advantages of high strength, large specific modulus, good plasticity, high temperature resistance, impact resistance, fatigue resistance, good overall structural performance and the like, the composite material is used as a reflecting surface to be connected with an antenna framework, and antenna reflecting surface installation is completed. The antenna reflecting surface manufactured through the integrated forming method has the advantages of being preformed, free of stress and high in stability, the problem that the pretension and the reverse pillow effect of a traditional cable net structure umbrella antenna affect the profile precision is solved, the machining efficiency of the umbrella antenna reflecting surface is effectively improved, batch production can be achieved, and industrialization is easy.

The invention relates to the field of antennas, in particular to a broadband frequency modulation umbrella antenna system and a manufacturing method thereof. A broadband frequency modulation umbrellaantenna system comprises a middle rod, an upper nest fixedly connected to the top end of the middle rod, a lower nest slidably connected to the middle rod, a plurality of line antenna oscillators rotatably connected with the upper nest, and support ribs connecting the lower nest and the line antenna oscillators, and each line antenna oscillator comprises at least two sections of guide rods and a connecting piece for connecting the adjacent guide rods. The connecting piece comprises an insulated connecting shell and a conduction switch used for controlling whether the adjacent guide rods are conducted or not. The antenna system is designed in the form of an umbrella for portable use. At least two sections of guide rods are connected together through an insulated connecting shell, and then whether the adjacent guide rods are connected or not is adjusted through a conduction switch, so that the radio wave receiving and transmitting range of the antenna oscillator is adjusted. The physicallength of the antenna does not change during adjustment, so that the antenna has a normal umbrella function when used as a main rib of an umbrella.

The invention discloses a high-precision umbrella-shaped antenna profile evaluation method, and belongs to the technical field of antennas. The method mainly comprises the following three steps: distributing profile errors of a high-precision umbrella-shaped antenna, and dividing the profile errors into design and manufacturing errors, measurement errors, profile expansion repetition errors and thermal deformation errors; calculating and evaluating antenna ground errors, and calculating design and manufacturing errors, profile measurement errors, repeated expansion errors and thermal deformation errors to obtain final ground profile precision of the antenna; and predicting an on-orbit profile of the antenna, and predicting the on-orbit profile of the antenna according to ground test and finite element simulation. According to the method, distribution calculation is carried out on the antenna profile precision to obtain the antenna profile precision meeting task indexes, and meanwhile,guided ground assembly debugging and on-orbit profile prediction of the antenna can be realized; the profile precision is an important index for evaluating the antenna; the profile of the high-precision umbrella-shaped antenna can be evaluated by using the method; and the method has an important application value.

The invention belongs to the technical field of satellite-borne antennas, and discloses a repeatable unfolding and folding mechanism, a double-folding umbrella antenna and a control method, and the mechanism comprises a padlock ring, a central ring tooth and a rotary bearing stand; the padlock ring, the central ring tooth and the rotary bearing stand are sequentially clamped between the central fixed surface and the central bottom plate from top to bottom, the outer side of the central ring tooth is meshed with a motor gear, and the motor gear is connected with a motor shaft of the lower motor; a root rib fixing plate is fixed to the outer side of the center bottom plate, and a root rib rotary table, a pulley rope clamping block, a wire guide ring and a volute spiral spring are installed at the upper end of the root rib fixing plate. An inhaul cable is arranged among the padlock ring, the wire guide ring and the pulley rope clamping block in a penetrating manner; and the other end of the inhaul cable is hinged with the root rib and the tip rib. The umbrella antenna is controllably unfolded and folded through the motor, large impact force generated when the torsional spring is unfolded is avoided, and repeated unfolding and folding can be conducted. A tedious pull rod mechanism is not needed, the installation steps are reduced, the reliability is improved, and the antenna can be applied to a large-caliber umbrella-shaped antenna.