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This is possible due to the Ultra Stable Oscillator(USO) onboard which produces the frequencies for the K-band ranging system. ^[1]

References

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^ Administrator, NASA (2013-06-06). "Spacecraft". NASA. Retrieved 2019-03-10.
^ Tapley, B. D.; Bettadpur, S.; Watkins, M.; Reigber, C. (2004). "The gravity recovery and climate experiment: Mission overview and early results". Geophysical Research Letters. 31 (9). doi:10.1029/2004GL019920. ISSN 1944-8007.

[1] Administrator, NASA (2013-06-06). "Spacecraft". NASA. Retrieved 2019-03-10.

[2] Tapley, B. D.; Bettadpur, S.; Watkins, M.; Reigber, C. (2004). "The gravity recovery and climate experiment: Mission overview and early results". Geophysical Research Letters. 31 (9). doi:10.1029/2004GL019920. ISSN 1944-8007.

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