A Fast Correction Method for the Focus Length of Radio Telescope

Abstract

The invention discloses a quick correcting method for focal length of a radio telescope. The method comprises the following steps of making the radio telescope perform N times of scanning on a radio source in a right ascension direction or a declination direction, the auxiliary reflection surface of the radio telescope is arranged at different axial positions in each scanning, thereby acquiring N sets of right ascension scanning data or declination scanning data; constructing a first parameterization model; introducing the N sets of right ascension scanning data or declination scanning data into the first parameterization model; performing calculation for obtaining Gauss function amplitudes which correspond with N times of scanning; constructing a second parameterization model; introducing the Gauss function amplitudes which correspond with the N times of scanning into the second parameterization model, and performing calculation for obtaining a focal length deviation; and adjusting the axial position of the auxiliary reflection surface based on the focal length deviation, thereby quickly correcting the focal length of the radio telescope. The quick correcting method can realize quick focal length correction and low cost and can correct the focal length change caused by various dynamic factors. Furthermore the quick correcting method can settle a problem of overhigh azimuth direction operation speed in high-elevation-angle scanning in an azimuth-and-pitching coordinate system.

Description

technical field [0001] The invention relates to a method for correcting the focal length of a radio telescope, in particular to a method for quickly correcting the focal length of a radio telescope. Background technique [0002] During astronomical observation, affected by time-varying factors such as temperature, gravity, and weather, the axial position of the sub-reflector of the radio telescope will change, causing the focal length to change, resulting in a decline in the electrical performance of the radio telescope. The more obvious the decline, the observation efficiency will be greatly reduced. For this reason, the present invention proposes a method for rapidly correcting the focal length of a radio telescope to quickly correct the focal length of the radio telescope and improve observation efficiency. [0003] In the prior art, the publication number is CN101771188A, the publication date is July 7, 2010, and the Chinese patent document entitled "Adaptive Focusing M...

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Problems solved by technology

However, this method is mainly aimed at the focal length change caused by temperature factors, and does not consider the influence of other time-varying factors on the focal length change, and this method needs to install a large number of temperature sensors, which has a high cost; in addition, the literature "TM65m radio telescope Model and Performance Evaluation" (Science in China: Physics, Mechanics and Astronomy) also proposed a method to correct the focal length of radio telescopes

However, this method is only for the focal length change caused by the gravity factor, and this method scans in the azimuth and elevation coordinate system, resulting in the azimuth running speed is too fast at high elevation angles, which affects the focal length error calculation, and does not support fast adjustment

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