"TS-SHIS运动误差校正与光谱精度评估研究"

Abstract In the process of target push-broom imaging by a temporally and spatially modulated spatial heterodyne interference imaging spectrometer (TS-SHIS), errors such as pointing mirror push-broom errors, pointing mirror positioning errors, or satellite motion platform vibrations can cause the corresponding image point (x', y') of the target to deviate from the ideal position (x, y). This leads to spectral contamination between adjacent spatial resolution units, which in turn affects the reconstruction of interference data and the accuracy of spectral recovery. Based on the mechanism of TS-SHIS, an analysis was conducted on the problems caused by motion errors, such as linear spectral blending of target spectra and the impact of different levels of surface reflectance differences on the accuracy of spectral recovery. A mixed target interference function relationship was established based on variables such as the contamination ratio of adjacent targets and the differences in surface reflectance. Using MODIS satellite payload observation data, an analysis of surface reflectance differences of different spatial resolutions in China was conducted. Using relative spectral error as an evaluation function, the study discusses the influence of typical high orbital platform attitude parameters on the accuracy of spectral recovery for different spatial resolution targets. This research provides a technical basis for the next generation of high-orbit, high-temporal and spatial resolution greenhouse gas detection technology.