Space target optic radiation flux simulation

Abstract

The target will be affected by the solar radiation, the earth radiation and the earth's reflected solar radiation during the flight. Due to the closeness of the earth to the target, the spatial position of the target has a great influence on the received radiative heat flux. At present, in many studies on the radiation characteristics of the target, researchers regard the earth as a black body with uniform temperature for equivalent replacement, which will cause certain errors in the calculation results. Therefore, based on the radiation transfer theory and spherical model, this paper analyzes the spatial position relationship between the target and the earth and the sun under different attitudes, calculates the angular coefficient relationship between solar radiation, earth radiation and the earth's reflected solar radiation, and build a simulation model of heat flux received by space target. The simulation results show that for the shadow environment, the target is only affected by the radiation of the earth. The model constructed in this paper can achieve refined modeling of the earth with higher accuracy than traditional methods. For environments with solar radiation, although the introduction of the sun compresses the effect of Earth's radiation, the effect of Earth's albedo needs to be considered in Earth modeling because the target receives a large amount of Earth-reflected solar radiation.