Accuracy analysis of indirect georeferencing about TH-1 satellite in Weinan test area

35th International Symposium on Remote Sensing of Environment

地球科学;生态环境科学

Yunlan, Yang^1,2 ; Haiyan, Hu^3,4,5

Chang'An University, College of Geology Engineering and Geomatics, Xi'an 710054, China^1

Xi'An Information Technique Institute of Surveying and Mapping, Xi'an 710054, China^2

Research Institute of Surveying and Mapping, Xi'an 710054, China^3

Institute of Surveying and Mapping, Information Engineering University, Zhengzhou 450052, China^4

National Key Geographic Laboratory of Information Engineering, Xi'an 710054, China^5

关键词: Accuracy analysis;    Bundle adjustments;    Direct georeferencing;    Linear CCD arrays;    Linear CCD sensors;    Parallel linear array;    Position accuracy;    Research approach;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/17/1/012211/pdf
DOI  :  10.1088/1755-1315/17/1/012211

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

Optical linear scanning sensors can be divided into single-lens sensors and multi-lens sensors according to the number of lenses. In order to build stereo imaging, for single-lens optical systems such as aerial mapping camera ADS40 and ADS80, there are more than two parallel linear arrays placed on the focal plane. And for a multi-lens optical system there is only one linear CCD arrays placed on the center of every focal plan for each lens which is often carried on spacecraft. The difference of design between these two kinds of optical systems leads to the systematic errors, calibration in orbit and approach of data adjustment are different completely. Recent years the domestic space optical sensor systems are focused on multi-lens linear CCD sensor in China, such as TH-1 and ZY-3 both belong to multi-lens optical systems. The parameters influencing the position accuracy of the satellite system which are unknown or unknown precisely even changed after sensor posted launch can be estimated by self-calibration in orbit. So after self-calibration in orbit the accuracy of mapping satellite will often be improved strongly. Comparing to direct georeferencing, the indirect georeferencing as a research approach is introduced to TH-1 satellite in this paper considering the systematic errors completely. Parameters about geometry position systematic error are introduced to the basic co-linearity equations for multi-lenses linear array CCD sensor, and based on the extended model the method of space multi-lens linear array CCD sensor self-calibration bundle adjustment is presented. The test field is in some area of Weinan, Shaanxi province, and the observation data of GCPs and orbit are collected. The extended rigors model is used in bundle adjustment and the accuracy analysis shown that TH-1 has a satisfied metric performance.