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IfE monthly gravity field solutions using the variational equations

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Original languageEnglish
JournalHannover : Institutionelles Repositorium der Leibniz Universität Hannover
Publication statusPublished - 13 Apr 2018

Abstract

In this contribution, we present the LUH-GRACE2018 monthly gravity field solutions from GRACE-KBR measurements, which produced at Institut für Erdmessung (IfE) at Leibniz University of Hannover. Our solutions, based on the classical variational approach, are obtained in two processing steps. In the first step, the orbits of both satellites are dynamically integrated and the initial state vectors together with accelerometer bias parameters of both satellites are adjusted using GRACE L1B reduced dynamic orbit. In the second step the 6-hourly-arc normal equations are accumulated and the monthly gravity field spherical coefficients up to degree and order 80 are estimated along with the unknown parameters of step 1. The geoid degree standard deviations of our solutions show a very good agreement with the official solutions of CSR, GFZ and JPL. The differences are well below 0.1 of an order of magnitude indicating the success of our implementation. Details of processing steps and the mass variations derived from our solutions are presented.

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IfE monthly gravity field solutions using the variational equations. / Naeimi, Majid; Koch, Igor; Khami, Arman et al.
In: Hannover : Institutionelles Repositorium der Leibniz Universität Hannover, 13.04.2018.

Research output: Contribution to journal › Article › Research

Naeimi, M, Koch, I, Khami, A & Flury, J 2018, 'IfE monthly gravity field solutions using the variational equations', Hannover : Institutionelles Repositorium der Leibniz Universität Hannover. https://doi.org/10.15488/4452
Naeimi, M., Koch, I., Khami, A., & Flury, J. (2018). IfE monthly gravity field solutions using the variational equations. Hannover : Institutionelles Repositorium der Leibniz Universität Hannover. https://doi.org/10.15488/4452
Naeimi M, Koch I, Khami A, Flury J. IfE monthly gravity field solutions using the variational equations. Hannover : Institutionelles Repositorium der Leibniz Universität Hannover. 2018 Apr 13. doi: 10.15488/4452
Naeimi, Majid ; Koch, Igor ; Khami, Arman et al. / IfE monthly gravity field solutions using the variational equations. In: Hannover : Institutionelles Repositorium der Leibniz Universität Hannover. 2018.
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AU - Naeimi, Majid

AU - Koch, Igor

AU - Khami, Arman

AU - Flury, Jakob

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AB - In this contribution, we present the LUH-GRACE2018 monthly gravity field solutions from GRACE-KBR measurements, which produced at Institut für Erdmessung (IfE) at Leibniz University of Hannover. Our solutions, based on the classical variational approach, are obtained in two processing steps. In the first step, the orbits of both satellites are dynamically integrated and the initial state vectors together with accelerometer bias parameters of both satellites are adjusted using GRACE L1B reduced dynamic orbit. In the second step the 6-hourly-arc normal equations are accumulated and the monthly gravity field spherical coefficients up to degree and order 80 are estimated along with the unknown parameters of step 1. The geoid degree standard deviations of our solutions show a very good agreement with the official solutions of CSR, GFZ and JPL. The differences are well below 0.1 of an order of magnitude indicating the success of our implementation. Details of processing steps and the mass variations derived from our solutions are presented.

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