639 results about "Satellite antennas" patented technology

A method, apparatus, article of manufacture, and a memory structure for generating reconfigurable beams is disclosed herein. The apparatus comprises a stationary feed array having a plurality of selectably activatable feed array elements, the feed array having a feed array sensitive axis; a reflector, illuminated by the selectably activatable feed array elements; a first mechanism, coupled to the reflector, for varying a position of the reflector along the feed array axis; wherein a desired beam size of the antenna system is selected by varying the reflector position along the feed array sensitive axis and by selectably activating the feed array elements.

The present invention relates to antenna architectures and methods on re-configurable multi-element antennas via feed re-positioning for various optimized radiation contours, including beam forming (or shaping) and/or null steering on contoured beams, spot beams, and orthogonal beams. The feed re-positioning techniques can also be used in radiation pattern optimization processing during antennas designing phases for fixed beams. The techniques are applicable for satellite communications. For satellite antennas, the beam shaping capability via element repositioning can be utilized for (1) optimized geometries on satellite antennas for given desired coverage areas, (2) re-optimizing radiation contours for reconfigurable antenna on board satellites in operation, (3) additional flexibility for satellite antennas using ground based beam forming (GBBF). As to satellite ground terminals, the same techniques are applicable for both fixed and mobile satellite terminals featuring either single beam or multiple beams. For fixed terminals, are applicable for terrestrial based communications; such as retrofitting existing antennas eliminating interference radiations coming from fixed or slow varying directions.

The invention discloses a broadband mobile communication method based on a multi-beam GEO satellite. The broadband mobile communication method based on the multi-beam GEO satellite mainly comprises the steps that spot beams at the Ka frequency band are adopted by NG+1 bidirectional feed links between a satellite-borne device and a ground station device, so that space division multiplexing is achieved for NG+1 times; a cellular network with NB cells is formed through NB bidirectional user links between the satellite-borne device and NT mobile user terminals based on an NB-beam satellite antenna, and space division multiplexing is achieved for NB/4 times with every four cells as a group, so that a 260 MHz bandwidth resource can be shared. The invention further discloses a broadband mobile communication system based on the multi-beam GEO satellite. According to the broadband mobile communication method and system based on the multi-beam GEO satellite, any one of the NT mobile user terminals can serve as an independent multimedia communication terminal as well as a local area network connected with a public Internet and can have access to a remote URL through the satellite links of the system, and an Internet service on the level similar to the 4G mobile communication level can be provided for a large number of people on various vehicles.

The invention brings forward a portable Ku-waveband marine satcom-on-the-move satellite communication antenna system comprising a portable Ku-waveband satellite communication antenna and a portable orientation/rolling rotary table; and an antenna control board and a rotary table control board respectively control the portable Ku-waveband satellite communication antenna and the portable orientation/rolling rotary table. The antenna control board calculates orientation/pitching/rolling angular-rate sensor signals and a satellite beacon receiver signal of the portable Ku-waveband satellite communication antenna so as to form an angular speed of the portable satellite antenna with movement of the orientation/rolling rotary table and satellite beacon receiver signal closed-loop tracking; and the rotary table control board calculates orientation /rolling angular-rate sensor signals at the orientation/rolling rotary table and reads an MEMS inertial navigation rolling angle signal sampled by the antenna control board so as to form the angular speed of the orientation/rolling rotary table with wave bumping and rolling angle position closed-loop tacking, so that the satellite antenna is always in a state of being aligned at the satellite. According to the invention, the application of the portable Ku-waveband satellite communication antenna is extended to the marine field and the system can be carried conveniently.

The invention discloses a combination measurement method for high precision position, azimuth angle and pitch angle, and a device thereof; a measurement basic line consists of measurement marking points where two satellite receiving antennas are arranged; a dual-system satellite positioning receiver plate and a beacon receiver plate synchronously receive the signals of a first satellite antenna and a beacon antenna; the dual-system satellite positioning receiver plate synchronously receives the digital signals of the beacon receiver; a GPS receiver plate synchronously receives the signals of a second satellite antenna; the first and second satellite antenna signals and beacon signals are synchronously calculated so as to precisely measure the three-dimensional position where the satellite antenna is arranged and measure the azimuth angle and pitch angle of the antenna basic line under geographic coordinates. The method and the device integrate the dual-system satellite positioning, GPS, beacon receiver plate and computer; the device is provided with a liquid crystal display screen, two satellites and a beacon receiving antenna outside the box, ensures the positioning precision more than 8 meters, receives beacon differential signals at coastal areas, leads the precision to be more than 1 meter and has the directional precision more than 0.1DEG under the basic line of 3 meters.

A hybrid control algorithm for low profile phased-array antennas, consisting of a gyro control and electronic beam-forming, operates to track the satellite. The antenna arrangements form a spatial phased-array capable of being rotated mechanically both in azimuth and elevation planes by the aid of step motors. An RF detector monitors the received RF power and provides a feedback signal to the control algorithm. Based on the monitored signals, provided by RF detector and gyros, the processing unit operates, under suitable algorithms, to home on and track the desired satellite. The arrangements can be mounted on a vehicle to provide TV and broadband internet signal to the user on the move.

Various embodiments of the present invention include assemblies and methods for utilizing antennas with high gain in small satellites. In one embodiment, a satellite comprising a payload configured for transmitting data is provided. The payload may include various components of the satellite, such as the attitude control system, electrical power system, and/or communication system. The satellite may be configured to communicate with one or more ground stations. The satellite includes a support structure comprising at least one deployable panel, wherein the support structure houses the payload. The satellite also includes at least one antenna coupled to the support structure, wherein the deployable panel is configured to cover the antenna in a non-deployed state and to expose the antenna in a deployed state.

The invention relates to an ocean profile loop detection buoy for collecting temperature, salinity and other profile data of ocean water. The ocean profile loop detection buoy structurally comprises a cylindrical pressure-resistant case body, an upper end cover and a lower end cover, wherein the upper end cover is provided with a sensor and a satellite antenna, a hydraulic plunger pump is arranged inside the pressure-resistant case body, the cylindrical pressure-resistant case body is short and thick and comprises an outer case and an inner case, the outer case is sleeved outside the inner case, the outer case and the inner case are in close fit with each other and can move, the upper and the lower end covers are respectively connected with the outer case and the inner case through upper and lower flanges, a hydraulic cylinder is mounted inside the case body, a cylinder tube and a piston rod of the hydraulic cylinder are respectively fixed on the upper and the lower flanges, and the hydraulic plunger pump is communicated with the cylinder tube. By adopting the hydraulic cylinder as a drive source, the volume of the buoy can be changed. The case body has the short and thicker cylindrical structure, so that the length of the buoy is reduced, the diameter of the buoy is increased, and the height of center of gravity of the buoy is lowered, as a result, the buoy can be protected against the impact caused by ocean currents and waves and remain stable.

The invention relates to a dynamic tracking satellite antenna. The antenna comprises an azimuth posture detection part, a signal level detection part and a servo system, wherein the master control servo system is a Z-axis adjusting stepping motor; the azimuth posture detection part is only formed by a Z-axis gyroscope and an accelerometer; the Z-axis gyroscope measures the moving direction and the speed of the antenna in the horizontal direction, and the included angle of the antenna relatively to a horizontal surface is measured by the accelerometer; and the servo system is controlled by a master control CPU to constantly adjust an azimuth angle, a roll angle and a pitch angle of the antenna so as to achieve the aim of dynamically tracking a satellite. The dynamic tracking satellite antenna has the advantages of low cost, simple structure and good tracking effect.

A radio communication route enables communication from an originating ground station to a destination ground station via one of multiple randomly orbiting satellites with no active attitude control. The ground stations and satellites include multi-feed parabolic antennas for receiving radio signals from and transmitting radio signals in multiple directions. The satellites store an address of a destination ground station from which an initial information signal is transmitted and antenna information identifying the satellite antenna feed on which the initial information signal was received. Plural satellite antennas transmit linking information identifying the satellite to the originating ground station. Data transmissions received at the originating ground station that designate a particular destination are transmitted by the originating ground station using the antenna on which the linking information was received and the satellite retransmits the data transmission using the satellite antenna feed identified by the stored antenna information.

The invention discloses a GNSS multi-frequency satellite navigation antenna which mainly solves the problem that an existing four-arm helical antenna is narrow in working frequency band and low in gain. The GNSS multi-frequency satellite navigation antenna comprises a frustum, a flexible medium covering the surface of the frustum, a mixed radiation arm printed on the surface of the flexible medium, a connector and a medium plate connected to the bottom of the frustum. A lower layer of the medium plate is provided with a power divider, an upper layer of the medium plate is provided with a radiation floor formed by a metal layer, and a radiator is connected with the power divider through a second connector. The antenna comprises all frequency bands (1.16-1.28GHz and 1.55-1.61GHz) of a GNSS, the number of global navigation satellite antennas can be reduced, and operator's purchase cost is reduced; the antenna simultaneously has the advantages that the frequency band is larger than 5.4dB, signal strength in the same direction and at the same distance can still be kept while power of a transmitter can be reduced, navigation precision is improved, noise jamming near the horizontal plane is reduced, and operation efficiency is improved.

Method for assigning a precoding beam forming scheme in a broadband satellite system, wherein said broadband satellite system comprises a multibeam satellite (1) having a plurality of antennas and a plurality of satellite beams, a gateway (2) and a number N of satellite terminals (ST₁₁, ST₁₂ . . . ST₂₁, ST₂₂, ST₂₃ . . . ST_K1, ST_K2 . . . ), and wherein said gateway (2) is configured for processing and serving a plurality of K beams of said plurality of satellite beams towards said number N of satellite terminals (ST₁₁, ST₁₂ . . . ST₂₁, ST₂₂, ST₂₃ . . . ST_K1, ST_K2 . . . ), wherein K<N, and wherein said assignation of a precoding beam forming scheme comprises a joint processing over said plurality of K beams. Said precoding beam forming scheme is dependent: on the radiation pattern of said satellite antennas; on the line of sight channel characteristics and on the multiuser diversity caused by said number N of satellite terminals (ST₁₁, ST₁₂ . . . ST₂₁, ST₂₂, ST₂₃ . . . ST_K1, ST_K2 . . . ). Gateway and satellite system. Computer program.

The invention discloses a fire-retardant ASA material and a preparation method thereof. The fire-retardant ASA material is prepared by the following components in accordance with the weight percentage: 72 to 82 percent of ternary graft copolymer which consists of acrylonitrile, styrene, and acrylic ester; 2 to 7 percent of flexibilizer, 12 to 18 percent of tetrabromobisphenol A, 3.0 to 7.0 percent of antimony trioxide, 0.3 to 0.5 percent of UV absorber, 0.1 to 1.0 percent of antioxidant, and 0.3 to 0.7 percent of lubricant. The fire-retardant ASA material not only has good fire-retardant property, but also maintains original toughness and weatherability of the ASA material, and can be widely used in the automotive field, electrical and electronic field, architecture field and other fields, for example, the use in the production of external parts such as automobile exterior mirrors, radiator grilles, tailgates, lampshades and the like, motorcycle panels, camping cars, small hulls, surfboards; all-weather shells such as sewing machines, telephones, kitchen equipment, satellite antennas, and the like; and can also be used in advanced bathrooms, hygiene products, and hot and cold water switches.