Laser interferometer for spaceborne mapping of the Earth's gravity field

The Gravity Recovery and Climate Experiment (GRACE) is one of the present missions to map the Earth's gravity field. The aim of a GRACE follow-on mission is to map the gravitational field of the Earth with higher resolution over at least 6 years. This should lead to a deeper insight into geophy...

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Bibliographic Details
Published in:Journal of physics. Conference series 2009-03, Vol.154 (1), p.012023
Main Authors: Dehne, Marina, Cervantes, Felipe Guzmán, Sheard, Benjamin, Heinzel, Gerhard, Danzmann, Karsten
Format: Article
Language:English
Subjects:
Earth gravitation
Frequency ranges
GRACE (experiment)
Gravitational fields
Interferometers
Low earth orbits
Multinational space ventures
Physics
Space missions
Spacecraft
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Summary:The Gravity Recovery and Climate Experiment (GRACE) is one of the present missions to map the Earth's gravity field. The aim of a GRACE follow-on mission is to map the gravitational field of the Earth with higher resolution over at least 6 years. This should lead to a deeper insight into geophysical processes of the Earth's system. One suggested detector for this purpose consists of two identical spacecraft carrying drag-free test masses in a low Earth orbit at an altitude of the order of 300 km, following each other with a distance on the order of 50 to 100 km. Changes in the Earth's gravity field will induce distance fluctuations between two test masses on separate spacecraft. These variations in the frequency range 1 to 100 mHz are to be monitored by a laser interferometer with nanometer precision. We present preliminary results of a heterodyne interferometer configuration using polarising optics, demonstrating the required phase sensitivity.
ISSN:1742-6596
1742-6588
1742-6596
DOI:10.1088/1742-6596/154/1/012023