Reconstruction Method of Satellite Gravity Gradient Measurement Angular Velocity by Combining Star Tracker Quaternion

GUO Zehua; WU Yunlong; XIAO Yun; HU Minzhang

doi:10.13203/j.whugis20200595

Volume 46 Issue 9

Sep. 2021

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Geomatics and Information Science of Wuhan University > 2021 > 46(9): 1336-1344. > DOI: 10.13203/j.whugis20200595

GUO Zehua, WU Yunlong, XIAO Yun, HU Minzhang. Reconstruction Method of Satellite Gravity Gradient Measurement Angular Velocity by Combining Star Tracker Quaternion[J]. Geomatics and Information Science of Wuhan University, 2021, 46(9): 1336-1344. DOI: 10.13203/j.whugis20200595

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Reconstruction Method of Satellite Gravity Gradient Measurement Angular Velocity by Combining Star Tracker Quaternion

GUO Zehua^{1, 2,},
WU Yunlong^{1, 2, 3, ,},
XIAO Yun⁴,
HU Minzhang^{1, 2}

1.
Institute of Seismology, China Seismological Bureau, Wuhan 430071, China
2.
Key Laboratory of Seismic Geodesy, China Seismological Bureau, Wuhan 430071, China
3.
College of Disaster Prevention Science and Technology, College of Geological Engineering, Sanhe 065201, China
4.
Xi'an Research Institute of Surveying and Mapping, Xi'an 710054, China

Funds:

The National Key Research and Development Program of China 2018YFC1503503-1

the National Natural Science Foundation of China 41931074

the National Natural Science Foundation of China 41974096

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Author Bio:
GUO Zehua, postgraduate, specializes in gravity gradient satellite data processing. E?mail: guozehua_geo@163.com
Corresponding author:
WU Yunlong, PhD, professor. E-mail: yunlongwu@gmail.com
Received Date: January 03, 2021
Published Date: September 17, 2021

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Abstract

Abstract

Objectives In order to calculate the high precision gravity gradient in level 1b (L1b) data processing of gravity field and steady-state ocean circulation explorer(GOCE)satellite, it is necessary to accurately measure the satellite attitude angular velocity. In the coordinate system transformation of the attitude data of astrology, the low precision angular velocity components of a single astrology instrument will transmit the noise to other angular velocity components, which will affect the calculation accuracy of the whole gravity gradient.
Methods In this paper, based on the noise characteristics of the astrological instrument, the weighted matrix of the noise distribution on each axis of the astrological instrument is constructed, and the optimal attitude quaternion is solved jointly for the attitude quaternion of two or more astrological instruments, so as to provide accurate attitude control for subsequent angular velocity recovery.
Results Compared with the single astro-meter calculation method, the accuracy of the optimal attitude angular velocity components w_y and w_z obtained by the combination of multiple astro-meters can reach about 1 order of magnitude higher within 10-100 mHz, and the noise level is up to 10^-6 rad/s, which can effectively suppress the noise propagation caused by the low precision angular velocity components in coordinate system transformation.
Conclusions The results show that the satellite attitude angular velocity calculated by the combination of multiple astrological instruments can be significantly improved in the whole power spectral density, the power spectral density of gravity gradient trace values calculated by the combined method of multiple astrologers is also significantly improved compared with the single astrologer method.
- satellite gravity gradient,
- astrograph celestial globe,
- quaternion calibration,
- attitude quaternion combination

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References (31)

References

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Reconstruction Method of Satellite Gravity Gradient Measurement Angular Velocity by Combining Star Tracker Quaternion

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