Combined inclined platform type large antenna

Abstract

The invention discloses a combined inclined platform type large antenna, and belongs to the technical field of antennas. The antenna comprises a reflector and an antenna seat frame. The antenna seat frame is composed of multiple layers of platforms which are sequentially connected from top to bottom, and the reflector is located on a platform plate of the topmost platform. Each platform comprises supporting columns and a platform plate. The tops of the supporting columns are connected with the platform plate, and the bottoms of the supporting columns are fixed to the next stage of platform plate through lifting devices. Each layer of platform realizes inclined movement in a certain space angle range through the combined movement of the supporting columns at the lower layer. Through the combined movement among the multiple layers of platforms, large-range spatial orientation of the reflector is finally realized. The antenna can realize an overhead tracking function, and has the characteristics of simple structure, reliable transmission, convenience in construction and the like.

Description

technical field [0001] The invention relates to the technical field of antennas, in particular to a large-scale combined inclined platform antenna. Background technique [0002] Antennas of satellite ground fixed tracking and measurement stations often use azimuth-elevation antenna mounts. This type of mount has the advantages of simple structure, traditional reliability, and high precision. But it can't solve the problem of overhead tracking. Overhead tracking is a key technique in moving target tracking. Especially for low-orbit satellites, there will be a "blind zone" near the 90° zenith. When the satellite flies through this blind area, the azimuth velocity of the antenna changes sharply while the pitch velocity changes slowly, and the antenna of the ground station will lose the tracking target because the azimuth velocity is not high enough. The size of the "blind zone" is related to the azimuth velocity of the ground station antenna and the target height. Increasi...

AI Technical Summary

Problems solved by technology

But its disadvantages are: the structure is not compact, and both axes need to add balance weights, resulting in a large moment of inertia of the two axes, which is not suitable for large antennas

But its disadvantages are: 1. The rotation backlash of the tilting mechanism will directly affect the basic stiffness and tracking accuracy of the antenna base, thereby reducing the resonant frequency of the antenna base. Large overturning moment; 3. Limited bearing capacity, difficult to manufacture and adjust, and not suitable for large antennas

Although this type of antenna does not have the problem of zenith blind area, the observation angle is limited and concentrated near the zenith area

In addition, the antenna form has great limitations, and it is not suitable for promotion except in special cases

[0009]In summary, although the above methods can solve the problem of overhead tracking of small aperture antennas, they cannot effectively solve the problem of overhead tracking of large fully movable antennas , mainly because it is difficult to overcome the volume problem of large antennas

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