Geometric positioning method of HY-1C/D satellite Chinese ocean color and temperature scanner

Liu Jianyang; Mao Zhihua; Tao Bangyi; Ma Li; Zhu Qiankun; Huang Haiqing; Liu Jianqiang; Ding Jing

doi:10.12284/hyxb2022029

Volume 44 Issue 5

Jun. 2022

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Article Navigation > Haiyang Xuebao > 2022 > 44(5): 47-61

Liu Jianyang，Mao Zhihua，Tao Bangyi, et al. Geometric positioning method of HY-1C/D satellite Chinese ocean color and temperature scanner[J]. Haiyang Xuebao，2022, 44(5)：47–61 doi: 10.12284/hyxb2022029

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Geometric positioning method of HY-1C/D satellite Chinese ocean color and temperature scanner

doi: 10.12284/hyxb2022029

1.
School of Oceanography, Shanghai Jiaotong University, Shanghai 200240, China
2.
State Key Laboratory of Satellite Marine Environment Dynamics, Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou 310012, China
3.
National Satellite Ocean Application Center, Beijing 100081, China

Received Date: 2021-04-16
Rev Recd Date: 2021-11-27

Available Online: 2022-06-15

Publish Date: 2022-06-15

Abstract

Abstract

Chinese Ocean Color Temperature Scanner (COCTS) of Haiyang 1C/D (HY-1C/D) satellite is mainly used to detect ocean water color, water temperature and other elements. These elements can only be achieved by processing satellite data, and geometric positioning is the core of preprocessing, which directly affects quality of these elements. COCTS has the characteristics of 114° field of view and quaternary whisk broom point by point. A set of complete geometric positioning method has been developed based on COCTS characteristics. The satellite position and velocity corresponding to the sampling time are obtained by using the interpolation method in the satellite ephemeris extracted from 0 level data, and then the transformation matrix from orbital coordinate system (ORB) to earth-centered rotating coordinate system (ECR) will be achieved. Based on the quaternary whisk broom point by point, the ORB viewing vector of every sampling point in a sweep can be calculated by rotating center viewing vector around X and Y axis in corresponding angles. The relationship model of viewing vector and the earth intersection point can be established to carry out geolocation of remote sensing images obtained from band data. This article uses interpolation to replace the traditional complex method that requires 6 orbital elements to calculate the satellite position, and directly calculates ORB to ECR transformation matrix rather than the traditional two-step transformation method. After multiple sets of data calculation and qualitative and quantitative verification, the HY-1C/D COCTS geometric positioning results are consistent. As a result of the sampling pixel scale effect, the error increases gradually from Nadir to the edge of two sides and from the equator to two poles, all within the error of 2 pixels. This method meets certain positioning accuracy requirements and can be employed for geometric positioning of COCTS.
- HY-1C/D satellite,
- COCTS,
- geometric positioning,
- whisk broom point by point

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References(21)

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