Near-earth space target infrared radiation simulation system and method

The invention belongs to the technical field of spaceflight, and particularly discloses a near-earth space target infrared radiation simulation system and method, and the system comprises a target geometric modeling and grid division module, an orbit heat flow calculation unit module, an infrared radiation calculation unit module, a single-target flight simulation module, and a multi-target flight simulation module. Calculating the solar radiation heat flux density, the earth reflection heat flux density and the earth radiation heat flux density of the units on the surface of the target; wherein the earth radiation heat flux density is calculated by adopting a unit hemisphere method; calculating temperature vectors of all nodes of the target by adopting a finite element method according to a calculation result in the step S2; calculating the radiation exitance of the target surface unit according to the target temperature field; performing single-target flight scene simulation and multi-target flight scene si