Measurement and Correction of Pointing Error Caused by Radio Telescope Alidade Deformation based on Biaxial Inclination Sensor

One of the key reasons for deterioration antenna pointing accuracy radio telescopes is deformation and tilt alidades, which primarily result from track unevenness thermal gradients. A high-precision inclinometer measurement system installed to investigate alidade errors caused thermally. An environment control box with a leveling base was designed reduce interference external environment, proved be effective in guaranteeing zero-point stability repeat inclinometer. The by measured test slowly rotating along azimuth at windless nighttime. 5-day stationary 48 h astronomical error were performed, capable measuring thermally induced inclinations acceptable accuracy. Through preliminary compensation experiment, compensated 37″ 12″, shows that application has good effect on improving antenna. high accuracy, stability, low computational complexity, proves an tool telescope solve problem real-time errors.