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Moon-to-Earth : eavesdropping on the GRAIL inter-spacecraft time-transfer link using a large antenna and a software receiver

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dc.contributor.author Esterhuizen, Stephan
dc.date.accessioned 2013-04-30T21:06:17Z
dc.date.available 2013-04-30T21:06:17Z
dc.date.issued 2012-09-20
dc.identifier.citation IThe Institute of Navigation ION GNSS 2012 Conference, Nashville, Tennessee, September 18–21, 2012 en_US
dc.identifier.clearanceno 12-4760
dc.identifier.uri http://hdl.handle.net/2014/43063
dc.description.abstract NASA’s twin GRAIL [1] spacecraft (Ebb and Flow) arrived at Earth’s Moon on New Year’s Day, 2012. GRAIL’s primary mission is to create a high-resolution map of the Moon’s gravitational field by measuring very precisely the change in distance between the two spacecraft [2]. Each spacecraft transmits two signals to the other spacecraft, a PRN code modulated on a 2 GHz carrier (S-band), as well as an unmodulated carrier at roughly 33 GHz (Ka-band). Since it’s not feasible to synchronize the two GRAIL spacecraft’s clocks via GPS (as was done with GRACE), the S-band signals are used as a time-transfer link to synchronize either Ebb’s clock to Flow or vice versa. As an independent measure to determine the clock offset of the GRAIL ultra-stable oscillators to UTC(NIST), an experiment was conducted where our JPL team used a large antenna on Earth to eavesdrop on the inter-spacecraft time-transfer link. en_US
dc.description.sponsorship NASA/JPL en_US
dc.language.iso en_US en_US
dc.publisher Pasadena, CA : Jet Propulsion Laboratory, National Aeronautics and Space Administration, 2012. en_US
dc.subject Gravity Recovery and Interior Laboratory (GRAIL) en_US
dc.subject Global Navigation Satellite System (GNSS) en_US
dc.subject time-transfer subsystem (TTS) en_US
dc.subject software receiver en_US
dc.title Moon-to-Earth : eavesdropping on the GRAIL inter-spacecraft time-transfer link using a large antenna and a software receiver en_US
dc.type Preprint en_US
dc.subject.NASATaxonomy Space Communications, Spacecraft Communications, Command and Tracking en_US


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