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US 7,843,385 B2Granted
Antenna device
AssigneeMitsubishi Electric Corporation
InventorsSatoru Sohfuku, Junji Takaki
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AssigneeMitsubishi Electric Corporation
InventorsSatoru Sohfuku, Junji Takaki
Estimating the term…
An antenna device includes: an antenna base portion; an antenna mount portion which is supported by the antenna base portion and rotated around an azimuth axis and which supports a main reflector with two struts; a frame structure group including a plurality of frame structures which are provided in the antenna base portion and the antenna mount portion, with six degrees of freedom restrained, respectively; a displacement gauge group which measures a displacement of the frame structure group; a metrology correction portion which calculates a pointing error of an antenna based on measured data of the displacement gauge group and calculates a metrology correction amount by removing an error amount arising depending on an azimuth angle from the calculated pointing error; and a control circuit which controls a driving of the antenna by correcting a drive command value of the antenna with the metrology correction amount.
An antenna device comprising:
An antenna device comprising:
An antenna device comprising:
Dependencies are inferred from the claim text.
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From the US filing history. Foreign family members aren’t listed.
Adaptation for use in or on movable bodies: adaptation for use in or on ships, submarines, buoys or torpedoes
Supports; Mounting means: for fastening a rigid aerial element
Supports; Mounting means: means for positioning
Using mechanical movement of antenna or antenna system as a whole: for varying two co-ordinates of the orientation
About 2 years 7 months of term left · ends 29 May 2029 (estimated)
This application is based upon and claims the benefit of priority from Japanese Patent Application No. 2008-069472, filed Mar. 18, 2008, the entire contents of which are incorporated herein by reference.
1. Field of the Invention
This present invention relates to an antenna device capable of measuring a displacement or inclination of a support structure having influence on the pointing direction to correct the pointing direction.
The above and other aspects of the present invention will become more apparent and more readily appreciated from the following description of exemplary embodiments of the present invention taken in conjunction with the attached drawings, in which:
FIG. 1 is a cross-sectional view of an antenna device according to an embodiment 1 of the present invention.
FIG. 2 is a cross-sectional view (excluding a main reflector portion) taken along the line A-A in FIG. 1.
An antenna device according to an embodiment 1 of this invention will be described below with reference to FIGS. 1 to 9. FIG. 1 is a cross-sectional view of the antenna device according to the embodiment 1 of this invention, and FIG. 2 is a cross-sectional view (excluding a main reflector portion) taken along the line A-A in FIG. 1. In FIG. 1, reference numeral 1 denotes an antenna base portion fixed and installed on the ground, and reference numeral 2 denotes an antenna mount portion supported rotatably around an azimuth axis on the antenna base portion 1. In the antenna mount portion 2, reference numeral 3 denotes two strut portions provided on the right and left sides, and reference numeral 4 denotes a bottom portion. Reference numeral 5 denotes a main reflector of the antenna, which is supported rotatably around an elevation axis by the right and left strut portions 3. Reference numeral 6 denotes a housing portion provided on the strut portions 3 and supporting the elevation axis of the main reflector 5.
Reference numeral 7 denotes a first frame structure provided within the antenna base portion 1, reference numeral 8 denotes a second frame structure provided on the bottom portion 4 of the antenna mount portion 2, and reference numeral 9 denotes a third frame structure provided on the strut portions 3 of the antenna mount portion 2. The first frame structure 7, the second frame-structure 8 and the third frame structure 9 have a truss structure, and can be treated as a rigid body by suppressing the flow of a load into them. That is, these frame structures, which are provided and supported on the antenna base portion 1 and the antenna mount portion 2, have a support (kinemateic support) structure without excessive restraint. Also, the internal thermal deformation of each frame structure is suppressed, using a material having low thermal expansion ratio such as Invar or CFRP material.
The operation of the antenna device according to the embodiment 1 will be described below. Since the antenna mount portion 2 is rotated around the azimuth axis, and the main reflector 5 is supported rotatably around the elevation axis by the antenna mount portion 2, whereby the main reflector 5 can be driven within a drive range of the azimuth angle and elevation angle and positioned to set the pointing direction of the antenna. The antenna base portion 1 is provided with an azimuth angle drive mechanism for rotating and positioning the antenna mount portion 2 around the azimuth axis, and the housing portion 6 of the antenna mount portion 2 is provided with an elevation angle drive mechanism for rotating and positioning the main reflector 5 around the elevation axis.