Zobrazeno 1 - 10
of 11
pro vyhledávání: '"Gregory L. Weaver"'
Publikováno v:
Proceedings of the 52nd Annual Precise Time and Time Interval Systems and Applications Meeting.
The Time and Frequency Laboratory (TFL) at the Johns Hopkins University Applied Physics Laboratory (JHU/APL) provides support to multiple NASA/APL missions that span our solar system from the Parker Space Probe, set to directly explore the Sun’s co
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::88d042b4bdf892a5aec23dbb3d0c97c8
https://doi.org/10.33012/2021.17798
https://doi.org/10.33012/2021.17798
Publikováno v:
ION Pacific PNT.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e15041dbb5acdd4cb4479b11ac51a2ba
https://doi.org/10.33012/2017.15057
https://doi.org/10.33012/2017.15057
Autor:
Valerio Formichella, Gregory L. Weaver, J. Robert Jensen, Patrizia Tavella, Goran Peskir, Cristina Zucca
Since launch on Jan 19th, 2006, the frequencies of the two ultra-stable oscillators (USOs A & B) on-board the New Horizons spacecraft have been determined using the application of non-coherent Doppler radiometric data. The two resulting histories are
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e0053ef556ca881d3cc548d71f7f8e1e
http://hdl.handle.net/11583/2675110
http://hdl.handle.net/11583/2675110
Autor:
Elizabeth A. Donley, Stefania Romisch, Dana Weinstein, Jeremy Everard, Ashwin A. Seshia, Helen S. Margolis, J. Delporte, Stefan Weyers, Gregory L. Weaver
Publikováno v:
IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control. 65:897-897
The 2017 Joint Conference of the IEEE International Frequency Control Symposium (IFCS) and European Frequency and Time Forum (EFTF) was held in Besancon, France, from July 10 to July 13. The Joint Conference is a biennial event combining the collecti
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e3c2a57a8d8edb147548fa508641c550
https://doi.org/10.1109/tuffc.2018.2838898
https://doi.org/10.1109/tuffc.2018.2838898
Autor:
Gregory L. Weaver, Paul P. Sotiriadis
Publikováno v:
International Journal of Navigation and Observation. 2008:1-7
Diophantine Frequency Synthesis (DFS), a number-theoretic approach to the design of very high resolution frequency synthesizers, was introduced in 2006. Further work concerning the impact of controlling mixing products for high-spectral purity was ad
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::01e874d83d761c82f324546f88b8ba42
https://doi.org/10.1155/2008/416958
https://doi.org/10.1155/2008/416958
Autor:
J. Robert Jensen, Gregory L. Weaver
Publikováno v:
2015 Joint Conference of the IEEE International Frequency Control Symposium & the European Frequency and Time Forum.
The New Horizons mission has provided an unprecedented opportunity to observe the evolution two ultra-stable oscillators in deep space for over nine years. The unusual architecture of the New Horizons communications system allows for direct observati
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2b34a1e0d9c056eca178b4e43c12a12d
https://doi.org/10.1109/fcs.2015.7138810
https://doi.org/10.1109/fcs.2015.7138810
Autor:
Darryl W. Royster, Matthew J. Crowne, Nelofar Mosavi, Dipak Srinivasan, Daniel E. Matlin, Gregory L. Weaver
Publikováno v:
2013 IEEE Aerospace Conference.
This paper presents the verification process, lessons learned, and selected test results of the radio frequency (RF) communication system of the Van Allen Probes, formerly known as the Radiation Belt Storm Probes (RBSP). The Van Allen Probes mission
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2112d3f39a83bded081ffa061e0c04c5
https://doi.org/10.1109/aero.2013.6497149
https://doi.org/10.1109/aero.2013.6497149
Publikováno v:
2012 IEEE Aerospace Conference.
The recent introduction of a first generation of chip scale atomic clocks (CSAC) offers an opportunity to enhance space-based communication and navigation systems with their unique aspects of frequency accuracy and very low size, weight and power. No
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::8f84359f7e429bfe6ba97cec0205e2be
https://doi.org/10.1109/aero.2012.6187111
https://doi.org/10.1109/aero.2012.6187111
Publikováno v:
2011 Joint Conference of the IEEE International Frequency Control and the European Frequency and Time Forum (FCS) Proceedings.
Our recent research at JHU/APL has focused on advancing algorithms and software control developments for a next generation, disciplined USO based clock system. This research shows promise that incorporating an in-situ control system for removing USO
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a9c97ed9b3364adc89a9773f5dba91e4
https://doi.org/10.1109/fcs.2011.5977876
https://doi.org/10.1109/fcs.2011.5977876
Autor:
Paul P. Sotiriadis, Gregory L. Weaver
Publikováno v:
2007 IEEE International Frequency Control Symposium Joint with the 21st European Frequency and Time Forum.
Diophantine frequency synthesis (DFS), a number theoretic approach to the design of very high resolution and agile frequency synthesizers was introduced at the IEEE frequency control symposium of 2006, [1]. Since DFS uses frequency addition (and/or s
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::51e75762ff6fb32d288b0f8ec13bac85
https://doi.org/10.1109/freq.2007.4319248
https://doi.org/10.1109/freq.2007.4319248