Pointing precision improving mechanism and self-adjusting method for primary focus feed type radio telescope

Abstract

The invention discloses a pointing precision improving mechanism and a self-adjusting method for a primary focus feed type radio telescope. According to the pointing precision improving mechanism and the self-adjusting method, the displacement of a focus position of a main reflecting surface after deformation relative to a focus position of the main reflecting surface before deformation is calculated through a numerical calculation method; the position self-adaptive adjustment of a primary focus receiver after the deformation of the main reflecting surface is realized through the adjustment in the X, Y and Z directions; aiming at some places with extremely irregular deformation caused by factors such as a shielding effect on the main reflecting surface, the primary focus receiver rotates around a Z axis, and a micro actuator finely adjusts a horn mouth, so that the requirement of the primary focus feed type large radio telescope on relatively high pointing precision is met; and the pointing precision problem of the primary focus feed type large-scale radio telescope after the primary focus feed type large-scale radio telescope is subjected to thermal deformation due to non-uniform sunlight is well solved.

Description

technical field [0001] The invention belongs to the technical field of large-scale radio telescopes, and in particular relates to a mechanism for improving the pointing accuracy of a main focus feeding radio telescope and a method for automatically adjusting the pointing accuracy of the main focus feeding type radio telescope. Background technique [0002] Pointing accuracy is one of the most important performance indicators of radio telescopes, especially for large-aperture, high-frequency radio telescopes, generally requiring pointing deviations to be less than 10% of the half-power width of the antenna. The pointing accuracy of a radio telescope is affected by external factors such as its own gravity, wind load, and temperature. The impact caused by the structure itself is generally considered in the design stage, so as to minimize the occurrence of errors; for wind loads, structural preservation analysis is generally considered under extreme loads and other conditions. ...

AI Technical Summary

Problems solved by technology

However, for the temperature load, because the radio telescope has been exposed to the external natural environment for a long time, and has been affected by non-uniform sunlight and periodically changing temperature for a long time, the inner and outer surfaces of its structure are constantly exchanging heat with the surrounding environment through radiation, convection, and conduction. And due to factors such as changes in the observation time of large radio telescopes, different observation targets, and changes in the shading effect after being subjected to non-uniform sunlight, the thermal deformation of the main reflector is irregular. Therefore, due to the influence of non-uniform sunlight, Improving the pointing accuracy of large radio telescopes becomes a difficult problem

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