Zobrazeno 1 - 10
of 74
pro vyhledávání: '"John J. Degnan"'
Autor:
John J. Degnan
Publikováno v:
Photonics, Vol 10, Iss 11, p 1215 (2023)
The present paper discusses the basics of retroreflector theory and the manner in which they are combined in arrays to service the laser tracking of artificial satellites and the Moon. We begin with a discussion of the relative advantages and disadva
Externí odkaz:
https://doaj.org/article/c9772ddc2ff44ff89d7bb0b14b64d56c
Multipurpose Laser Instrument for Interplanetary Ranging, Time Transfer, and Wideband Communications
Autor:
John J. Degnan
Publikováno v:
Photonics, Vol 10, Iss 2, p 98 (2023)
In this paper, we discuss the design and feasibility of a multifunctional laser instrument capable of precision ranging, time transfer, and wideband communications over interplanetary distances throughout our solar system. To simplify the communicati
Externí odkaz:
https://doaj.org/article/b2f6e4679c25413dae61d4325f1f37b3
Autor:
John J. Degnan
Publikováno v:
Remote Sensing, Vol 8, Iss 11, p 958 (2016)
Several scanning, single photon sensitive, 3D imaging lidars are herein described that operate at aircraft above ground levels (AGLs) between 1 and 11 km, and speeds in excess of 200 knots. With 100 beamlets and laser fire rates up to 60 kHz, we, at
Externí odkaz:
https://doaj.org/article/7da07915cd944f46b02f2acd7daf6243
Autor:
John J. Degnan
Publikováno v:
IEEE Journal of Quantum Electronics. 57:1-11
A highly inclusive theory of Q-switched lasers is presented which applies to both actively and passively Q-switched lasers. The theory expands on the author’s previous publications on energy optimization to include: (1) saturable absorbers exhibiti
Autor:
John J. Degnan, Carey Noll, Georg Kirchner, Michael R. Pearlman, Frank G. Lemoine, Ludwig Combrink, Erricos C. Pavlis, Ulrich Schreiber
Publikováno v:
Journal of Geodesy. 93:2161-2180
The International Laser Ranging Service (ILRS) was established by the International Association of Geodesy (IAG) in 1998 to support programs in geodesy, geophysics, fundamental constants and lunar research, and to provide the International Earth Rota
Autor:
Jan F. McGarry, R. L. Ricklefs, I. F. Diegel, J. W. Cheek, John J. Degnan, H. L. Donovan, E. Hoffman, C. B. Clarke, A. R. Nelson, D. S. Patterson, T. Zagwodzki, J. E. Horvath, M. Marzouk, S. L. Wetzel, M. Shappirio
Publikováno v:
Journal of Geodesy. 93:2249-2262
For over 40 years, NASA's global network of satellite laser ranging (SLR) stations has provided a significant percentage of the global orbital data used to define the International Terrestrial Reference Frame (ITRF). The current NASA legacy network i
Autor:
John J. Degnan, Georg Kirchner, Peter J. Dunn, Christopher Moore, Zhang Zhongping, Hiroo Kunimori, Mikhail Sadovnikov, Matthew Wilkinson, Victor Shargorodskiy, Ivan Prochazka, C. Courde, Ulrich Schreiber
Publikováno v:
Journal of Geodesy
Journal of Geodesy, Springer Verlag, 2019, 93 (11), pp.2227-2247. ⟨10.1007/s00190-018-1196-1⟩
Journal of Geodesy, Springer Verlag, 2019, 93 (11), pp.2227-2247. ⟨10.1007/s00190-018-1196-1⟩
International audience; Satellite laser ranging (SLR) stations in the International Laser Ranging Service (ILRS) global tracking network come in different shapes and sizes and were built by different institutions at different times using different te
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4b528fe2f2c7148a053f02aa67315f14
https://hal.archives-ouvertes.fr/hal-02556833
https://hal.archives-ouvertes.fr/hal-02556833
Autor:
John J. Degnan
Publikováno v:
International Journal of Modern Physics D. 16:2137-2150
Since 1964, the NASA Goddard Space Flight Center (GSFC) has been using short pulse lasers to range to artificial satellites equipped with passive retroreflectors. Today, a global network of 40 satellite laser ranging (SLR) stations, under the auspice
Autor:
Cesar Ventura, Terence Barrett, Christopher Field, J. Marcos Sirota, Biruh Tesfaye, Roman Machan, Edward Leventhal, Spencer Disque, John J. Degnan, Daniel Caplan, Yunhui Zheng
Publikováno v:
Imaging and Applied Optics 2015.
We describe scanning, 100 beam, 3D imaging lidars, capable of interrogating up to 3.2 million Megapixels per second while operating at aircraft AGLs up to 9 km and speeds in excess of 200 knots .
Autor:
John J. Degnan
Publikováno v:
Journal of Geodynamics. 34:503-549