Main focus feeding type radio telescope pointing accuracy improving mechanism and self-adjusting method

Abstract

The invention discloses a pointing accuracy improving mechanism and a self-adjusting method for a main focus feeding type radio telescope. First, the displacement of the focal position after the deformation of the main reflecting surface relative to the focal position before the deformation is calculated by a numerical calculation method; The adjustment of the three directions of 、Z realizes the adaptive adjustment of the position of the main focus receiver after the main reflection surface is deformed; then, for some places on the main reflection surface with extremely irregular deformation caused by factors such as occlusion effects, the main focus receiver The method of rotating around the Z axis and fine-tuning the bell mouth by the micro-actuator can meet the higher pointing accuracy requirements of the main focus-fed large-scale radio telescope, and solve the problem that the main-focus-fed large-scale radio telescope is subject to abnormal conditions. The problem of pointing accuracy after thermal deformation caused by uniform sunlight.

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 type 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 and high-frequency radio telescopes. Generally, the pointing deviation is required 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. For the influence of the structure itself, it is generally considered in the design stage, so as to minimize the generation of errors; for wind loads, it is generally considered to carry out structural preservation analysis under con...

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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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