The Rapid Evaluation Method of the Effects of Sun on Space-Borne Synthetic Aperture Radiometer Based on Simplified Perturbation Model

Based on the two-line element number (TLE) and the SGP4 model, a rapid prediction method of the solar incidence angle of the near-Earth satellite is proposed in this paper. By calculating the position relation between the sun and the spaceborne synthetic aperture radiometer antenna, the image of the sun in the field of view can be established. In this way, it is possible to quickly predict the brightness temperature effect of the sun in the field of view of the synthetic aperture radiometer at any time on orbit in future. The accuracy of the method is analyzed by evaluating the sun impact of the synthetic aperture radiometer with the actual orbit of satellites in-orbit.