Precise determination method of extreme working conditions of external heat flow of orbit of remote sensor in whole life cycle

The invention discloses a precise determination method of extreme working conditions of external heat flow of an orbit of a remote sensor in a whole life cycle, and belongs to the technical field of precise heat control of spatial optical remote sensors. The method specifically includes: 1), selecting parts, which are on a satellite and block the external heat flow of a light entrance of the remote sensor, and parts which are inside the remote sensor and in radiation heat exchange with an optical lens, ignoring radiation, heat capacity and heat conductivity of the back of the optical lens, andestablishing a finite-element heat model of the remote sensor; (2), adopting heat analysis software to calculate temperature of all finite-element nodes of the finite-element heat model of the remotesensor in the whole life cycle according to the preset orbit, and extracting temperature of each finite-element node of the optical lens of the remote sensor in the whole life cycle therefrom; and (3), calculating external he