两种大气传输模型在海面红外成像系统性能评估中的适用性对比研究

LOWTRAN与MORTRAN的比较

毕业设计（论文）题目：两种大气传输模型在海面红外成像系统性能评估中的适用性对比研究

学 院： 光电学院

专 业：电子科学与技术(光电子方向)

班 级： 01430701

姓 名： 张波

指导教师： 曹峰梅

LOWTRAN与MORTRAN的比较

摘要

大气透过率的计算在红外成像系统的设计和性能评估具有非常重要的意义，但在实际应用中往往并不能通过测量得到大气透过率，而是通过对大气的建模，由大气的气象参数和组成成分来推导计算得出大气透过率。而大气模型建立和选用的准确与否，，直接决定了输出的准确性与精确度，所以，对各种模型在不同实际情况下的模拟精度进行分析和比较，从中选出适用于实际情况的大气特性计算模型也是一项必不可少的工作。本课题拟从比较不同的大气透过率计算模型入手，通过对LOWTRAN和MODTRAN的对比和分析，从中选出分别在实时性、准确性和对海面传输情况的适用性上占优的大气特性计算模型。

文章首先简单介绍了背景知识和辐射传输原理；然后对要进行比较的大气模型和其他常见大气模型进行了介绍；接下来讲述了程序编写的过程；最后，对实验结果进行了分析和主观评估。

关键词:LOWTRAN，MODTRAN，大气透过率 ，实时性，准确性，适用性

LOWTRAN与MORTRAN的比较

Abstract

Atmospheric transmittance has the extremely vital significance in designing and performance evaluating infrared imaging system, but in practical applications we often cannot get it through the calculation of some radiative transfer model instead of measurement. These models calculate atmospheric transmittance with useful meteorological parameters and the atmospheric composition 。So the choice of model decide the accuracy precision of the result, we must choose a suitable one according to practical situation. This subject intend to do a comparison of two models, LOWTRAN and MODTRAN, and to choose the better one with three aspects :instantaneity, accuracy and applicability of Marine environment

In this paper, ,the author firstly introduces the background and details the theory of IR transmission；Then the author represent some transfer models widely used; Next, ,the author will describe how I will realization process on PC for the coming comparison; Finally, ,the author will analyses and subjectively evaluate the result, and to give a conclusion.

Keywords: LOWTRAN，MODTRAN, Atmospheric transmittance, instantaneity, accuracy ,applicability

LOWTRAN与MORTRAN的比较

目录

摘要 ...................................................................................................................................... 1

Abstract .............................................................................................................................. 3

第一章 引言 ........................................................................................................................ 5

1.1课题背景 .................................................................................................................. 5

1.2 大气辐射传输理论 ............................................................................................. 5

1.2.1 大气传输对红外辐射的总体影响 ................................................................. 5

1.2.2 吸收衰减 ......................................................................................................... 6

1.2.3 散射衰减 ......................................................................................................... 8

1.2.4 大气模型的建立 ............................................................................................. 9

1.3 工作概要和本文的安排 .................................................................................... 10

第二章 几种大气传输模型 .............................................................................................. 11

2.1 LOWTRAN ................................................................................................................. 11

2.2 M0DTRAN ................................................................................................................. 11

2.3 FASCODE ................................................................................................................. 13

2.4其他简便算法 ....................................................................................................... 14

第三章 基于两种大气模型程序的编写 .......................................................................... 15

3.1设计思路 ................................................................................................................ 15

3.2 参数的选择 .......................................................................................................... 16

3.3 程序实现过程 ...................................................................................................... 18

3.3.1 子模块的编写 ................................................................................................. 18

3.3.2 模块的连接与调用 ....................................................................................... 20

第四章，计算结果的分析与比较 .................................................................................... 21

4.1 实时性的比较 ...................................................................................................... 21

4.2 准确性的比较 ...................................................................................................... 22

4.2.1 三组光谱透过率数据的比较 ......................................................................... 22

4.2.2总结与结论 ...................................................................................................... 26

4.3 适用性的比较 ...................................................................................................... 26

4.3.1 使用中的适用性 ................................. …… 此处隐藏：13390字，全部文档内容请下载后查看。喜欢就下载吧 ……