Abstract
Abstract. The low frequency error is a key factor which has affected uncontrolled geometry processing accuracy of the high-resolution optical image. To guarantee the geometric quality of imagery, this paper presents an on-orbit calibration method for the low frequency error based on geometric calibration field. Firstly, we introduce the overall flow of low frequency error on-orbit analysis and calibration, which includes optical axis angle variation detection of star sensor, relative calibration among star sensors, multi-star sensor information fusion, low frequency error model construction and verification. Secondly, we use optical axis angle change detection method to analyze the law of low frequency error variation. Thirdly, we respectively use the method of relative calibration and information fusion among star sensors to realize the datum unity and high precision attitude output. Finally, we realize the low frequency error model construction and optimal estimation of model parameters based on DEM/DOM of geometric calibration field. To evaluate the performance of the proposed calibration method, a certain type satellite’s real data is used. Test results demonstrate that the calibration model in this paper can well describe the law of the low frequency error variation. The uncontrolled geometric positioning accuracy of the high-resolution optical image in the WGS-84 Coordinate Systems is obviously improved after the step-wise calibration.
Highlights
Geometric positioning accuracy of high-resolution optical satellite images without control points depends on satellite orbit accuracy determined by GPS, time synchronization accuracy between each payload, the relative installation parameters accuracy between each payload, internal calibration accuracy of earth observation camera, attitude determination accuracy based on star sensor and gyro combination and other factors (Tang et al, 2011; Li et al, 2016)
To effectively eliminate or weaken the influence of low frequency error on image geometric positioning accuracy under no control point, this paper proposed ground compensation method, including the following specific processes: (1) Low frequency error analysis and detection based on optical axis angle change between the star sensors
High resolution optical satellite usually configures three star sensors, and we could determine the absolute satellite attitude information based on the optical axis vectors of two star sensors
Summary
Geometric positioning accuracy of high-resolution optical satellite images without control points depends on satellite orbit accuracy determined by GPS, time synchronization accuracy between each payload, the relative installation parameters accuracy between each payload, internal calibration accuracy of earth observation camera, attitude determination accuracy based on star sensor and gyro combination and other factors (Tang et al, 2011; Li et al, 2016). The related literatures have carried on the analysis to the error source of optical image geometric processing, influence degree of different types of errors and solution method, proposed orbit calibration of payloads installation errors and internal camera distortion based on geometric calibration field (Yuan, 2012; Bouillon, 2006; Wang, 2012). The data of a certain type of high resolution optical satellite launched in July 2015 was analysed, and the geometric calibration field was used to verify and evaluate the algorithm in this paper
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