Calibration of Swarm accelerometer data by GPS positioning and linear temperature correction

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F18%3A00494655" target="_blank" >RIV/67985815:_____/18:00494655 - isvavai.cz</a>

Result on the web

<a href="http://dx.doi.org/10.1016/j.asr.2018.04.041" target="_blank" >http://dx.doi.org/10.1016/j.asr.2018.04.041</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.asr.2018.04.041" target="_blank" >10.1016/j.asr.2018.04.041</a>

Result language

angličtina

Original language name

Calibration of Swarm accelerometer data by GPS positioning and linear temperature correction

Original language description

warm, a mission of the European Space Agency, consists of three satellites orbiting the Earth since November 2013. In addition to the instrumentation aimed at fulfilling the mission's main goal, which is the observation of Earth's magnetic field, each satellite carries a geodetic quality GPS receiver and an accelerometer. Initially put in a 500-km altitude, all Swarm spacecraft slowly decay due to the action of atmospheric drag. Atmospheric particles and radiation forces impinge on the satellite's surface and thus create the main part of the nongravitational force, which together with satellite-induced thrusts can be measured by space accelerometers. Unfortunately, the Swarm accelerometer data are heavily disturbed by the varying onboard temperature. We calibrate the accelerometer data against a calibration standard derived from observed GPS positions, while making use of the models to represent the forces of gravity origin. We show that this procedure can be extended to incorporate the temperature signal. The obtained calibrated accelerations are validated in several different ways. Namely by (i) physically modelled nongravitational forces, by (ii) intercomparison of calibrated accelerometer data from two Swarm satellites flying side-by-side, and by (iii) good agreement of our calibrated signals with those released by ESA, obtained via a different approach for reducing temperature effects. Finally, the presented method is applied to the Swarm C accelerometer data set covering almost two years (July 2014-April 2016), which ESA recently released to scientific users.

Czech name

—

Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10308 - Astronomy (including astrophysics,space science)

Project

<a href="/en/project/LG15003" target="_blank" >LG15003: Calibration of accelerometers onboard SWARM satellites by means of kinematic orbits and gravity field models</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2018

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Advances in Space Research

ISSN

1879-1948

e-ISSN

—

Volume of the periodical

62

Issue of the periodical within the volume

2

Country of publishing house

GB - UNITED KINGDOM

Number of pages

9

Pages from-to

317-325

UT code for WoS article

000436913000006

EID of the result in the Scopus database

2-s2.0-85047079385