In-Orbit Geometric Calibration for Long-Linear-Array and Wide-Swath Whisk-Broom TIS of SDGSAT-1

Because of the imaging mechanism complexity long-linear-array and wide-swath whisk-broom thermal infrared spectrometer (TIS) first Sustainable Development Goals Satellite (SDGSAT-1), how to achieve a high geometric positioning accuracy (GPA) becomes core factor in subsequent quantitative applications. Here, this article, three-step in-orbit calibration (GC) strategy comprising estimations exterior orientation parameters (EOPs), interior (IOPs), scanning compensation (SCPs) is proposed correct geo-location displacements for TIS. First, accordance with optical-mechanical structure pinhole theory, we establish rigorous model (RGPM) TIS analyze error resources term-by-term along propagation link elaborately. Second, corresponding (RGCM) constructed detail based on 2-D look-angle generalized bias correction matrix. Especially eliminating systematic nonlinear errors direction, fifth-degree polynomial put forward be employed fit compensate angular measurement mirror. Finally, estimation method presented estimate ground control points (GCPs). Experimental results spatial references Landsat 8 panchromatic images version 2 advanced spaceborne emission reflection radiometer (ASTER) global digital elevation (GDEM2) show that GPA along-track cross-track directions can better than 1.0 pixels all three bands, which makes great sense associated measurements.