空间目标红外特征仿真模型

Infrared signature simulation model for space objects

建立了一种基于三维场景的空间目标红外辐射特征计算模型.模型对多层介质目标进行几何建模与三维剖分,考虑目标微动时太阳和地球对目标加热的影响,计算了目标外表面的辐射散热及内腔壁面元间的辐射换热,在此基础上完成目标的三维导热计算,利用Gauss-Seidel迭代法求解微元体的温度,进而计算了中长波和长波红外波段目标自身的辐射、对外热源的反射以及总的辐射亮度图像和辐射强度曲线.研究表明,无自旋的目标在圆周方向受太阳加热不均,温差显著;自旋使目标圆周方向温差减小,温度分布趋于均匀.

Based on specified three-dimensional scene,an infrared signature simulation model for space objects was developed.Firstly,an object was geometrically modeled and decomposed into micro-elements in three-dimensions.Formulation for surface heating of the object with micro-motion dynamics from the sun and earth was derived.Energy dissipated into space from outer surface as well as the thermal exchange between facets of inner surface was calculated.In this way,three-dimensional thermal conduction of a ballistic object constructed with multi-layer materials was calculated,and the micro-element temperatures were obtained using Gauss-Seidel iteration.Then,radiant components including self-emitted radiation and surface-reflected radiation from the sun and earth in mid-long wave infrared band and long wave infrared band were calculated.It is seen that,because of the sun heating,temperature difference along the circumference is obvious when the object moves without spinning motion in space.Such difference becomes trivial when it undergoes spinning motion.