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Remote Sens. 2015, 7(1), 111-134; doi:10.3390/rs70100111

High-Precision Attitude Post-Processing and Initial Verification for the ZY-3 Satellite

1
Satellite Surveying and Mapping Application Center, NASG, 28 Lianhuachi West Road, Beijing 100830, China
2
Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application, 1 Wenyuan Road, Nanjing 210023, China
3
Institute of Remote Sensing and Digital Earth Chinese Academy of Sciences, 3 Datun Road, Beijing 100101, China
4
Beijing UniStrong Science & Technology Co., Ltd., Beijing 100015, China
5
State Key Laboratory of Information Engineering in Surveying, Mapping and Remote Sensing, Wuhan University, 129 Luoyu Road, Wuhan 430079, China
*
Authors to whom correspondence should be addressed.
Academic Editors: Richard Müller and Prasad S. Thenkabail
Received: 13 October 2014 / Accepted: 5 December 2014 / Published: 24 December 2014
View Full-Text   |   Download PDF [2368 KB, uploaded 24 December 2014]   |  

Abstract

Attitude data, which is the important data strongly correlated with the geometric accuracy of optical remote sensing satellite images, are generally obtained using a real-time Extended Kalman Filter (EKF) with star-tracker and gyro data for current high-resolution satellites, such as Orb-view, IKONOS, Quickbird,Pleiades, and ZY-3.We propose a forward-backward Unscented Kalman Filter (UKF) for post-processing, and the proposed method employs UKF to suppress noise by using an unscented transformation (UT) rather than an EKF in a nonlinear attitude system. Moreover, this method makes full use of the collected data in the fixed-interval and computational resources on the ground, and it determines optimal attitude results by forward-backward filtering and weighted smoothing with the raw star-tracker and gyro data collected for a fixed period. In this study, the principle and implementation of the proposed method are described. The post-processed attitude was compared with the on-board attitude, and the absolute accuracy was evaluated by the two methods. One method compares the positioning accuracy of the object space coordinates with the post-processed and on-board attitude data without using ground control points (GCPs). The other method compares the tie-point residuals of the image coordinates after a free net adjustment. In addition, the internal and external parameters of the camera were accurately calibrated before use for an objective evaluation of the attitude accuracy. The experimental results reveal that the accuracy of the post-processed attitude is superior to the accuracy of the on-board processed attitude. This method has been applied to the ZiYuan-3 satellite system for processing the raw star-tracker and gyro data daily. View Full-Text
Keywords: attitude accuracy; star tracker/gyro; post-processing; geometric accuracy attitude accuracy; star tracker/gyro; post-processing; geometric accuracy
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Tang, X.; Xie, J.; Wang, X.; Jiang, W. High-Precision Attitude Post-Processing and Initial Verification for the ZY-3 Satellite. Remote Sens. 2015, 7, 111-134.

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