Imaging process modeling and system performance evaluation of ir imaging systems ( iriss ) avail to optimize system design and evaluate imagery and performance . so system modeling is of significance not only in theoretical research but also in practical application 建立红外成像系统的成像过程模型和性能评估模型,对于系统的优化设计、图像质量和系统性能的评价,具有重要的研究意义和广泛的应用前景。