A Pointing Adjustment Method of Large Shaped Dual-Reflector Antenna Based on Electromechanical Coupling

Abstract

The invention discloses a method for adjusting the pointing of a large-scale shaped double reflector antenna based on electromechanical coupling, which includes: (1) establishing a finite element model of the antenna structure; (2) determining a segmented fitting surface of the shaped main reflector of the antenna; (3) Calculate the finite element node coordinates of the main reflector after thermal deformation, the rotation angle of the secondary reflector and the displacement of the vertex; (4) Determine the best matching surface of the deformed antenna-shaped main reflector; (5) Calculate the antenna The antenna pointing deviation caused by the temperature distribution of the main reflector; (6) Calculate the pointing deviation of the secondary reflector caused by the thermal deformation of the antenna; (7) Calculate the total pointing deviation of the antenna caused by the thermal deformation of the structure; (8) Calculate the antenna pointing deviation in the local coordinate system The total pointing deviation is converted into the pointing adjustment of the antenna in the geodetic coordinate system; (9) Calculate the adjusted antenna pointing and beam pointing. The invention improves the electrical performance of the antenna by adjusting the azimuth and pitch angle of the antenna servo system, and the analysis and calculation process is more concise and efficient.

Description

technical field [0001] The invention belongs to the technical field of antennas, in particular to a pointing adjustment method of a large-scale shaped double-reflector antenna based on electromechanical coupling, which is used for adjusting the beam pointing of the shaped double-reflector antenna to optimize the electrical performance of the antenna. Background technique [0002] Large antennas play an important role in fields such as deep space exploration, astronomical observation, and strategic long-range early warning. Under the action of gravity load, temperature load and wind load, etc., the antenna will undergo structural deformation, which will make the reflective surface deviate from the shape required by the electrical design, and at the same time make the beam pointing of the antenna deviate from the original design direction of the antenna, thus seriously affecting the electrical performance of the antenna. influences. This effect is more obvious with the increa...

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Problems solved by technology

[0005] Aiming at the deficiencies of the previous compensation methods, the present invention provides a pointing adjustment method based on electromechanical coupling for a large-scale shaped double-reflector antenna, which mainly solves the beam pointing deviation caused by thermal deformation of the large-scale shaped double-reflector antenna The problem is to improve the electrical performance of the antenna by adjusting the azimuth and elevation angles of the antenna servo system

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