Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci., XLI-B1, 511-516, 2016
http://www.int-arch-photogramm-remote-sens-spatial-inf-sci.net/XLI-B1/511/2016/
doi:10.5194/isprs-archives-XLI-B1-511-2016
 
03 Jun 2016
THE SYSTEM OVERVIEW AND GEOMETRIC IMAGE QUALITY OF THE TH-1 SATELLITE
Jianrong Wang1,2 and Xin Hu1 1Xi’an Institute of Surveying and Mapping, Xi’an, China
2Faculty of Geo-Information Science and Earth Observation (ITC) of University of Twente, Enschede, The Netherlands
Keywords: Location accuracy, Satellite photogrammetry, On-orbit calibration, Bundle adjustment, Low-frequency errors, Line-Matrix CCD camera Abstract. The Tian-Hui 1 (TH-1) is the first stereo mapping transmission satellite in China, and the primary mission goal of the satellite is for topographic mapping at 1:50,000 scale without Ground Control Points (GCPs). 1st, 2nd and 3rd satellite of TH-1 was launched on August 24, 2010, May 6, 2012 and October 26, 2015. In TH-1 satellite, many payloads are put on a small satellite platform, which has a low cost. The optical camera of TH-1 includes Line-Matrix CCD (LMCCD) camera, high resolution camera and multispectral camera with 60 km ground swath width. To get high geometric accuracy without GCPs, the on-orbit calibration camera parameters and the Equivalent Frame Photo (EFP) Multi-functional bundle adjustment are proposed and realized in ground image processing of TH-1. In order to evaluate the location accuracy of TH-1, some testing fields are established. All GCPs of testing fields are measured by GPS. The GCPs are not participated the EFP Multi-functional bundle adjustment, and are only as Check Points (CPs) to evaluate the location accuracy. The evaluation of 1st satellite is shown: the horizontal accuracy is 10.3 m (RMSE) and the vertical accuracy is 5.7 m (RMSE) without GCPs, which can satisfy for topographic mapping at 1:50,000 scale. The overviews of TH-1 satellite are described in this paper: First, the system overview is introduced, including mission and optical camera of TH-1. Then, the on-orbit calibration camera parameters using LMCCD image and the EFP Multi-functional bundle adjustment are presented. Finally, the location performance is analysed without GCPs and with different number of GCPs. In addition, the products of TH-1 are introduced.
Conference paper (PDF, 1098 KB)


Citation: Wang, J. and Hu, X.: THE SYSTEM OVERVIEW AND GEOMETRIC IMAGE QUALITY OF THE TH-1 SATELLITE, Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci., XLI-B1, 511-516, doi:10.5194/isprs-archives-XLI-B1-511-2016, 2016.

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