Method for improving primary positioning precision of receiver of radio telescope

Abstract

The invention provides a method for improving primary positioning precision of a receiver of a radio telescope. The method includes steps of S1, utilizing a measurement instrument for measuring poses of the receiver and obtaining a measurement value *M; S2, obtaining a joint deviation correction control volume Delta Theta by utilizing a deviation correction process in a deviation correction control model; S3, applying an input volume Theta C of a controller obtained after adding a joint deviation correction control volume Delta Theta to a joint spatial expected value Theta obtained through inverse kinematics conversion to the controller so as to acting on a feed source support system; S4, repeating the S1 to S3 and compensating position errors of primary positioning of the receiver in a receiver pose error allowable range. According to the invention, position errors of the primary positioning of the receiver can compensated in a high level, so that position error compensation load of a Stewart platform fine tuning mechanism is reduced and related precision requirements can be met even without controlling a Stewart platform in conditions with comparatively small original primary positioning errors.

Description

technical field [0001] The invention belongs to the technical field of positioning of large-aperture radio telescopes, and in particular relates to a method for improving the primary positioning accuracy of a radio telescope receiver. Background technique [0002] In order to work in a large-scale space, large-aperture radio telescopes often use a feed support control system that combines coarse adjustment and fine adjustment to ensure that the receiver can achieve the planned position and attitude (refer to: Li Hui, Zhu Wenbai, Pan Gao Feng. Mechanics and Research Progress in Feed Support of FAST Telescope[J]. Progress in Mechanics, 2011,41(2):133-154). The 500m-aperture radio telescope FAST independently built in my country adopts the scheme of coarse adjustment of the first-level cable support mechanism combined with fine adjustment of the second-level Stewart platform. Due to the limited attitude space that the first-stage cable support mechanism can reach, the AB rotat...

AI Technical Summary

Problems solved by technology

This control scheme can better meet the requirements in design, but there may be the following problems in actual operation: 1. When the wind causes vibration of the feed cabin equipped with the AB rotating shaft and the stewart platform, the error of primary positioning may deviate from the design index Larger, and the working space of the Stewart platform is limited, so it is difficult to guarantee that the Stewart platform can control the error within the allowable range in this case; 2. The rapid compensation of the Stewart platform may produce a large reaction force and improper control It is easy to cause resonance in the feed cabin

Therefore, there is room for optimization of existing control schemes

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