摘要:
An antenna system for a moving vehicle, the antenna system comprising: a main antenna to generate a main beam; a measurement antenna to generate a measurement beam; and control circuitry to perform an adjustment process by: rotating the main beam to an initial bearing angle; rotating the measurement beam independently of the main beam to receive signals at positions to either side of the initial bearing angle; comparing at least one metric measured for the signals received by the measurement antenna at the positions to either side of the initial bearing angle to generate a comparison output; and determining, based on the comparison output, a correction to be applied to the initial bearing angle of the main beam.
摘要:
In one example of the present disclosure a dielectric layer for use in an antenna assembly is described. The dielectric layer may comprise a planar body formed using a dielectric material. The dielectric layer may further comprise a plurality of openings defined in the planar body and surrounding a plurality of portions of the dielectric material, each of the plurality of portions of the dielectric material being configured to be aligned with an antenna element of a plurality of antenna elements of the antenna assembly.
摘要:
A communication system according to one embodiment comprises: a communication device including a tracking unit which rotates with respect to a first axis, a second axis, and a third axis that are orthogonal to each other and which performs radio-wave communication with a moving object moving within the field of view; and a controller for controlling the communication device so that the tracking unit rotates with respect to the first axis and the second axis in the range of a first trajectory angle of the moving body and rotates with respect to the second axis and the third axis in the range of a second trajectory angle of the moving object.
摘要:
Various base station cellular enclosures are detailed herein. An airfoil enclosure housing may be present that defines a cavity for housing a base station cellular antenna. The housing may have a leading edge and a vent that permits air from external the airfoil enclosure housing to enter the cavity of the airfoil enclosure housing. The enclosure may further include a rotatable coupling that attaches the airfoil enclosure housing to a support structure. The rotatable coupling can allow the airfoil enclosure housing to rotate based on wind such that the leading edge faces into the wind.
摘要:
The present invention provides a reflective array surface. The reflective array surface includes a functional board that is configured to perform beam modulation on an incident electromagnetic wave and a reflection layer that is disposed on one side of the functional board and is configured to reflect an electromagnetic wave, where the functional board includes two or more functional board units and the reflection layer includes reflection units, where the number of reflection units corresponds to the number of functional board units, where the functional board unit and a reflection unit corresponding to the functional board constitute a phase-shifting unit that is used for phase shifting. According to the reflective array surface in the present invention, a functional board unit and a reflection unit corresponding to the functional board unit constitute a phase-shifting unit that is used for phase shifting, which can solve a problem in the prior art that a phase-shifting effect is not exquisite enough and a beam modulation capability for an electromagnetic wave is poor, thereby affecting bandwidth and working performance of a reflective array antenna. In addition, the present invention further provides a reflective array antenna.
摘要:
An antenna system may include a base having an opening therein, and a swing arm having a concave elongate shape and opposing ends pivotally connected to the base to permit a swinging motion of the swing arm within the opening in the base. A swing arm positioner may be connected between the swing arm and the base. The antenna system may also include an antenna carriage movable along the swing arm. An antenna carriage positioner may be connected between the antenna carriage and the swing arm. A positioning controller may be connected to the swing arm positioner and the antenna carriage positioner, and an antenna may be connected to the antenna carriage.
摘要:
A vehicle-mounted satellite signal receiving system adopting a satellite tracking system combining gyro tracking and hybrid tracking is disclosed which can correct a sensitivity coefficient for correcting a gyro sensor output signal to make up for a sensitivity error, even when a drift is produced in the sensitivity error. In this system, gyro tracking is caused when the received power level is above a threshold power level. The gyro tracking is done by determining the angular velocity .omega. of an antenna as .omega.=-(.omega.G.times..DELTA.SB+.omega.G from a value obtained by inverting the sign of the product of a gyro tracking angular velocity .omega.G and a sensitivity coefficient .DELTA.SB for dealing with the sensitivity error and a predetermined offset error correction value .omega.G and setting the antenna to .omega.. When .DELTA.SB is inaccurate and a sensitivity error is generated in the gyro sensor output signal, the received power level is reduced. When the received power level becomes lower than a threshold power level LB, the sensitivity coefficient is corrected on the basis of the sense of the angular velocity .omega.S in the hybrid tracking (step tracking) and in the gyro tracking.
摘要:
An embodiment of the present invention is a system for automatically pointing a directional antenna. The system comprises two GPS antennas mounted at horizontally opposed extremities of the directional antenna, the placement is such that the GPS antennas lie on a line having a normal vector approximately parallel to a boresight of the directional antenna. The outputs from the GPS antennas are downconverted to a measurement frequency and differentially phase compared for each of a plurality of radio visible GPS satellites. A measurement controller that receives the phase comparisons. A navigation computer receives measurements from the measurement controller and uses a microprocessor to calculate the GPS latitude and longitude and the attitude angles of the pair of GPS antennas. A servo points the directional antenna at a particular target communications satellite, based on the computed azimuth, elevation, latitude, and longitude, as provided by the navigation computer. One of these servos is used to move the GPS antennas in roughly a circle to average out multipath effects to improve accuracy and to reduce integer ambiguities.
摘要:
A method of, and apparatus for, controlling the directional aiming of an antenna device including: scanning the antenna along with a conical path and detecting a directional point at which a detected level of reception along the conical path is turned from increasing to decreasing; scanning the antenna along a directional path defined by a center point of the conical path and the directional point, and detecting a signal source point at which a detected level of reception along the directional path is turned from increasing to decreasing; and setting a directional aiming of the antenna at the detected signal source point.
摘要:
An apparatus for rapidly starting and stopping a conical scan antenna beam in which a feed rotating about a centerline provides a non-conical scan antenna beam during a search mode. When a target is detected a solenoid moves an actuator pin which displaces one end of the feed from the centerline providing a conical scan antenna beam for target tracking.