Improving the GRACE Kinematic Precise Orbit Determination Through Modified Clock Estimating
Autor: | Hua Chen, Xuexi Liu, Xingyu Zhou, Weiping Jiang, Zhao Li |
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Jazyk: | angličtina |
Rok vydání: | 2019 |
Předmět: |
grace
010504 meteorology & atmospheric sciences Kinematics 010502 geochemistry & geophysics lcsh:Chemical technology 01 natural sciences Biochemistry Article Analytical Chemistry Physics::Geophysics Root mean square kinematic precise orbit determination Position (vector) lcsh:TP1-1185 Electrical and Electronic Engineering Allan variance Instrumentation Physics::Atmospheric and Oceanic Physics 0105 earth and related environmental sciences Mathematics Dilution of precision business.industry ppp-ar gps Geodesy Atomic and Molecular Physics and Optics Physics::Space Physics Orbit (dynamics) Global Positioning System clock estimating Astrophysics::Earth and Planetary Astrophysics business Orbit determination |
Zdroj: | Sensors, Vol 19, Iss 19, p 4347 (2019) Sensors (Basel, Switzerland) Sensors Volume 19 Issue 19 |
ISSN: | 1424-8220 |
Popis: | Utilizing global positioning system (GPS) to determine the precise kinematic orbits for the twin satellites of the Gravity Recovery and Climate Experiment (GRACE) plays a very important role in the earth&rsquo s gravitational and other scientific fields. However, the orbit quality is highly depended on the geometry of observed GPS satellites. In this study, we propose a kinematic orbit determination method for improving the GRACE orbit quality especially when the geometry of observed GPS satellites is weak, where an appropriate random walk clock constraint between adjacent epochs is recommended according to the stability of on-board GPS receiver clocks. GRACE data over one month were adopted in the experimental validation. Results show that the proposed method could improve the root mean square (RMS) by 20&ndash 40% in radial component and 5&ndash 20% in along and cross components. For those epochs with position dilution of precision (PDOP) larger than 4, the orbits were improved by 50&ndash 70% in radial component and 17&ndash 50% in along and cross components. Meanwhile, the Allan deviation of clock estimates in the proposed method was much closer to the reported Allan deviation of GRACE on-board oscillator. All the results confirmed the improvement of the proposed method. |
Databáze: | OpenAIRE |
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