分振幅光偏振探测系统多点定标方法

Multi-point calibration method for division-of-amplitude photopolarimetric detection system

探测性能决定了偏振遥感系统的解析精度,但分振幅系统因多种因素引入的仪器偏振使解析精度的提高受到限制。在分析测量原理的基础上,研究了分振幅光偏振探测系统测量矩阵的多点定标方法,推导了偏振方位角等间隔取样偏振定标的条件;通过平台搭建与比较实验,利用多点定标方法测量了航空多角度偏振辐射计(AMPR)的穆勒矩阵,分析了测量结果的不确定性。结果表明,定标后的AMPR测量误差<0.5%、不确定度<0.5%,满足遥感系统的探测要求,证明了多点定标方法的可行性。

Analytical accuracy of polarization remote sensing system is determined by instrumental detection performance. However, it is limited for the instrumental polarization introduced by various factors. In this paper, a multi-point calibration method for measurement matrix of division-of-amplitude （DoA） photopolarimetric detection system had been proposed by analyzing the measurement principle, and the conditions to calibrate a DoA polarization detection system with interval sampling polarization azimuth angle had been derived. Through building a test platform and conducting comparative experiments, the measuring matrix of aviation multi-angular polarimetric radiometer （AMPR） had been determined using the multi-point calibration method mentioned above and the uncertainty had been investigated. The experiment results indicate the measurement error of AMPR is less than 0.5% and corresponding uncertainty is also less than 0.5%, which demonstrate the detection system requirements has been met for AMPR and the feasibility of multi-point calibration method is verified.