CAJ | 학술논문

地基望镜对空间目标的长焦距红外成像能够得到空间目标的温度区分布信息,然而成像过程的未知参量将降低传统的双波段比色测温法正向求解精度.未知参量包括目标发射率、大气透过率、地球热辐射等.文中建立了基多波段红外探测器测量电子数的贝斯估计评价函数模型,能够比较精确地反向求解空间目标的真实温度分布;并推导了目标参量估计函数的克拉美·罗界,能够预测一系列不确定素对其温度和发射率等参数求解精度的影响;最后进行了算法的仿真实验与分析.
지기망경대공간목표적장초거홍외성상능구득도공간목표적온도구분포신식,연이성상과정적미지삼량장강저전통적쌍파단비색측온법정향구해정도.미지삼량포괄목표발사솔、대기투과솔、지구열복사등.문중건립료기다파단홍외탐측기측량전자수적패사고계평개함수모형,능구비교정학지반향구해공간목표적진실온도분포;병추도료목표삼량고계함수적극랍미·라계,능구예측일계렬불학정소대기온도화발사솔등삼수구해정도적영향;최후진행료산법적방진실험여분석.
The temperature distribution of space objects can reflect in-orbit state. Ground-based and long-focal length imaging of space objects in infrared band provides information from which temperature distribution maps can be determined. The methods of the traditional temperature estimation are often single-band radiance and dual-band color thermometry. Uncertainties in the imaging process will reduce the traditional single-band radiance and dual-band color thermometry forward calculation accuracy. Such uncertainties include target emissivity, atmospheric transmittance, the earth's heat radiation, etc. In this paper, multi-band Bayesian estimation function model relating the measured number of electrons was established, the true temperature of space target could be more accurately solved. The model provided an estimation theoretic framework for developing optimal estimators and calculating Cramer-Rao lower bounds. The Cramer-Rao bounds of target parameter estimation function was derived, which could predict the accuracy of solving of the temperature and emissivity. Finally, the simulation and analysis of the algorithm was performed.