Heliostat Correction System Based on Celestial Body Images and Its Method

A heliostat correction system based on celestial body images, provided on a reflecting surface of a heliostat which is fixed on a rotation axis, comprising:

• an image acquisition module,
• a data analysis module,
• a correction calculation module,
• a data storage module, and
• a communication module;
• wherein the image acquisition module is in a same direction as the reflecting surface of the heliostat, the image acquisition module and the heliostat both facing celestial bodies or other markers;
• a deviation angle between an optical axis vector of the image acquisition module and a normal vector of the heliostat is known;
• the image acquisition module is used for acquiring images of the celestial bodies moving regularly in a field of view and having a certain brightness, and then sending the images to the data analysis module, which analyzes a deviation value between the celestial body image and an image center in an image coordinate system and transmits the deviation value to the correction calculation module, which decomposes the deviation value to a corresponding rotation axis according to a rotation mode of the heliostat to obtain the deviation angle of each rotation axis;
• the data storage module is used for storing a correction result of the heliostat and a single correction period control command list of the heliostat;
• the communication module is used for reading the single correction period control command list from the data storage module, and then sending the list to the heliostat while controlling the image acquisition module to shoot according to a rotation period of the heliostat.