Attitude Low-Frequency Error Spatiotemporal Compensation Method for VIMS Imagery of GaoFen-5B Satellite

Yanli Wang, Zhipeng Dong, Mi Wang

Abstract: Thermal environment fluctuations introduce the attitude low-frequency error (ALFE) related to the orbital period. This causes the geometric positioning accuracy of visible and infrared multispectral sensor (VIMS) imagery of GaoFen-5B (GF-5B) satellite to vary from tens of meters to hundreds of meters. In this letter, a compensation method for ALFE is proposed based on the temporal and spatial characteristics. By considering the spatial characteristics of low-frequency error (LFE) in different regions, the models of internal and external LFE compensation were established using the segmented Fourier series model (SM) and the parameter of latitude. The sequential calibration and compensation method with different time intervals was proposed to address the temporal drift of LFE. Experimental results demonstrated that the internal and external LFE compensation improves geometric positioning accuracy of VIMS imagery from 6.927 to 2.428 pixels and from 3.045 to 1.438 pixels, respectively. The proposed method ensures the stability and consistency of geometric positioning accuracy of VIMS imagery across different time periods and regions.