Ni Zhuoya, Lu Qifeng, Xu Yishu, Huo Hongyuan
Key Laboratory of Radiometric Calibration and Validation for Environment Satellites, National Satellite Meteorological Center, China Meteorological Administration, Beijing 100081, China.
State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences, Beijing 100081, China.
Sensors (Basel). 2020 Mar 26;20(7):1833. doi: 10.3390/s20071833.
This paper introduces an intensity simulation for the Fourier transform infrared spectrometer whose core element is the Michelson interferometer to provide support for the on-orbit monitoring of the instrument and to improve the data processing and application of the Fourier transform spectrometer. The Geostationary Interferometric Infrared Imager (GIIRS) aboard on Fengyun-4B (FY-4B) satellite, which will be launched in 2020, aims to provide hyperspectral infrared observations. An intensity simulation of the Michelson interferometer based on the GIIRS's instrument parameters is systematically analyzed in this paper. Off-axis effects and non-linearity response are two important factors to be considered in this simulation. Off-axis effects mainly cause the wavenumber shift to induce a large brightness temperature error compared with the input spectrum, and the non-linearity response reduces the energy received by the detector. Then, off-axis effects and a non-linearity response are added to the input spectrum successively to obtain the final spectrum. Off-axis correction and non-linearity correction are also developed to give a full simulation process. Comparing the corrected spectrum with the input spectrum, we can see that the brightness temperature errors have a magnitude of 10 K, and this fully proves the reliability and rationality of the whole simulation process.
本文介绍了一种以迈克尔逊干涉仪为核心元件的傅里叶变换红外光谱仪的强度模拟，为该仪器的在轨监测提供支持，并改进傅里叶变换光谱仪的数据处理与应用。搭载于将于2020年发射的风云四号B星（FY-4B）上的静止轨道干涉式红外成像仪（GIIRS）旨在提供高光谱红外观测。本文系统分析了基于GIIRS仪器参数的迈克尔逊干涉仪强度模拟。离轴效应和非线性响应是该模拟中需考虑的两个重要因素。离轴效应主要导致波数偏移，与输入光谱相比会引起较大的亮温误差，而非线性响应会减少探测器接收到的能量。然后，将离轴效应和非线性响应依次添加到输入光谱中以获得最终光谱。还开发了离轴校正和非线性校正以给出完整的模拟过程。将校正后的光谱与输入光谱进行比较，可以看出亮温误差幅度为10 K，这充分证明了整个模拟过程的可靠性和合理性。
