On-Ground Processing of Yaogan-24 Remote Sensing Satellite Attitude Data and Verification Using Geometric Field Calibration

Abstract

Satellite attitude accuracy is an important factor affecting the geometric processing accuracy of high-resolution optical satellite imagery. To address the problem whereby the accuracy of the Yaogan-24 remote sensing satellite’s on-board attitude data processing is not high enough and thus cannot meet its image geometry processing requirements, we developed an approach involving on-ground attitude data processing and digital orthophoto (DOM) and the digital elevation model (DEM) verification of a geometric calibration field. The approach focuses on three modules: on-ground processing based on bidirectional filter, overall weighted smoothing and fitting, and evaluation in the geometric calibration field. Our experimental results demonstrate that the proposed on-ground processing method is both robust and feasible, which ensures the reliability of the observation data quality, convergence and stability of the parameter estimation model. In addition, both the Euler angle and quaternion could be used to build a mathematical fitting model, while the orthogonal polynomial fitting model is more suitable for modeling the attitude parameter. Furthermore, compared to the image geometric processing results based on on-board attitude data, the image uncontrolled and relative geometric positioning result accuracy can be increased by about 50%.

On-Orbit Calibration of Installation Matrix between Remote Sensing Camera and Star Camera Based on Vector Angle Invariance

“…The asynchronous error of satellite clock is 0.1 ms. The distortion calibration residual of remote sensing camera is set to 0.3 pixels [ 25 ]. In order to more realistically simulate the motion of the remote sensing camera on orbit, we use the real motion data of the remote sensing camera on-orbit as the motion simulation.…”

On-Orbit Calibration of Installation Parameter of Multiple Star Sensors System for Optical Remote Sensing Satellite with Ground Control Points

“…The attitude determination measures the orientation of the satellite in the J2000 (Julian year 2000) celestial coordinate system and can be expressed by a transformation matrix [4]. When the orbit altitude is 500 km, an attitude measurement error of 1" can introduce a geometric error of 2.4 m. Thus, the attitude measurement error becomes a key factor influencing the geometric accuracy of high-resolution optical remote sensing satellites without GCPs [5].…”

Vertical Accuracy Simulation of Stereo Mapping Using a Small Matrix Charge-Coupled Device

“…For example, the star sensor of Yaogan-24 in China is equipped with only 5″ error in the optical axis (3σ). Although the attitude accuracy can be improved a little by post-processing, it is not sufficient to meet the accuracy requirements for large-scale surveying and mapping [18,19].…”