Scanning mode trajectory planning method and system for large-aperture radio telescope in motion

Abstract

The invention belongs to the field of motion control of large-aperture radio telescopes, particularly relates to a scanning mode trajectory planning method and system in motion of a large-aperture radio telescope, and aims to solve the problems of discontinuous speed and low effective utilization rate of a scanning trajectory caused by frequent rapid speed change and direction change of the large-aperture radio telescope. The method comprises the following steps: initializing right ascension and declination positions and speeds of starting and ending parts of each to-be-planned scanning section based on sky area scanning parameters; extracting right ascension and declination in the celestial coordinate system, and constructing a space-time Bezier curve equation of right ascension and declination time by combining time as a to-be-planned variable; taking the minimum curve curvature as a target, integrating the normal scanning segment track, and obtaining a scanning sky right ascension and declination complete track under a celestial coordinate system; and converting to obtain a planned moving track of the feed source terminal under an east-north sky coordinate system of the earth. The OTF scanning speed is continuous, the impact on the system is small, no pause process exists in the planned track, and the effective utilization rate of the scanning track is improved.

Description

technical field [0001] The invention belongs to the field of motion control of large-diameter radio telescopes, and in particular relates to a scanning mode track planning method and system during the motion of large-diameter radio telescopes. Background technique [0002] Five-hundred-meter Aperture Sphericalradio Telescope (FAST, Five-hundred-meter Aperture Sphericalradio Telescope) is the world's largest single-aperture spherical radio telescope independently built by my country, such as image 3 shown. As one of the six major systems of the FAST project, the FAST feed source support system is composed of a six-cable traction parallel mechanism, an AB-axis rotation mechanism and a Stewart parallel mechanism. Its duty is to position the feed source terminal to the active reflector for fitting on time and accurately The focus position of the paraboloid, and make the feed terminal point to a specific direction. For different astronomical observation tasks, FAST currently in...

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