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|Title: ||Laser frequency stabilization for GRACE-II|
|Authors: ||Folkner, W. M.|
Klipstein, W. M.
|Keywords: ||laser ranging|
|Issue Date: ||22-Jun-2010 |
|Publisher: ||Pasadena, CA : Jet Propulsion Laboratory, National Aeronautics and Space Administration, 2010.|
|Citation: ||Earth Science Technology Forum, Arlington, Virginia, June 22, 2010.|
|Abstract: ||The GRACE mission monitors changes in the Earth’s gravity field by measuring changes in the distance between spacecraft induced by that changing field. The distance variation is measured with a microwave ranging system with sub-micron accuracy. The ranging measurement accuracy is limited by the signal-to-noise ratio and by the frequency stability of the microwave signal referenced to an ultra-stable oscillator (USO). For GRACE-2 a laser ranging system is envisioned with accuracy better than the GRACE microwave ranging system. A laser ranging system easily provides an improved signal-to-noise ratio over the microwave system. Laser frequency stability better than the GRACE USO stability has been demonstrated in several laboratories using thermally stabilized optical cavities. We are developing a space-qualifiable optical cavity and associated optics and electronics for use on GRACE-2 to provide a stable frequency reference for the laser ranging system. Two breadboard units have been developed and tested for performance and ability to survive launch and orbit environments. A prototype unit is being designed using lessons learned from tests of the breadboard units.|
|Appears in Collections:||JPL TRS 1992+|
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