CSST Slitless Spectroscopy Ground Test Based on the 80 cm Telescope at the Xinglong Observatory

The Chinese Space Station Telescope (CSST), which is expected to be launched in 2025, will mainly be used for large-scale multicolor imaging and slitless surveys. Before launch, it is necessary to use ground-based telescopes to conduct ground tests on the optical imaging system, detectors, and equipment of the space telescope for long-term operational stability. This dissertation designs a slitless spectral ground test for the 80 centimeter telescope at Xinglong Observation Observatory. By utilizing the strong absorption and emission line characteristics of A-type stars, B-type stars, and the Wolf-Rayet star HD4004, the dispersion equation is fitted and found to have spatial distribution characteristics. We performed quadratic surface fitting on the zero order spectral position information and dispersion equation coefficients of 53 pieces of HR3173 data, and used this curve to calibrate the wavelength of HR718 data within the zero order image position range of HR3173. The average radial velocity accuracy obtained was 51 km/s.