摘要
卫星的红外和可见光信号的特征取决于外部太阳辐射光源的状况,与卫星的运动和姿态确定方式密切相关。按照基本的物理原理对可见光波段卫星红外和光学信号的建模,根据卫星与太阳、地球和传感器的相对位置关系和材料表面光学特性来计算卫星的光学信号。在轨道计算和坐标变换过程中,建立太阳翼对日定向的数学模型来考虑卫星运动和姿态的变化。卫星表面材料的光学特性使用了S-R双向反射分布函数(BRDF)模型,并推导了考虑直接反射和间接反射红外和可见光信号的计算公式。最后,采用太阳同步轨道的轨道根数进行模拟计算,得到了模型卫星辐射强度的分布和辐射亮度序列灰度图像,并分析了卫星红外和可见光信号的特征。
The characteristics of infrared and visible signature of satellite depend on the situations of solar radiation in space, which is closely associated with the mode of motion and attitude determination of satellite. In the process of modeling optical signature of satellite in visible spectral band on first principles, optical signature is computed according to geometry relationship among satellite, sun, earth, sensor and optical properties of materials on satellite surfaces Attitudes change of satellite is analyzed via mathematical description of sense of orientation to sun of solar vanes in proceeding orbit determination and ordinate transformation. The Sandford-Robertson model is then employed to calculate the Bidirectional Reflection Distribution Function （BRDF） which characterizes optical proprieties of materials on the surfaces of satellite, and formulae for calculating infrared and visible signature of satellite including direct and indirect reflections are subsequently deduced. Moreover, Elements of sun-synchronous orbit are used in simulation of optical signature of prototype satellite, and contours of radiation intensity are achieved as well as sequential gray scale pictures of radiance of satellite. Finally, characteristics of infrared and optical signature of satellite are analyzed.
出处
《光电工程》
CAS
CSCD
北大核心
2009年第5期40-46,共7页
Opto-Electronic Engineering
基金
国防预研项目
关键词
信号
红外
可见光
卫星
姿态
光学特性
signature
infrared
visible light
satellite
attitude
optical property
