Zobrazeno 1 - 10
of 69
pro vyhledávání: '"James R. Lesh"'
Autor:
William J. Weber, Richard B. Miller, Charles D. Edwards, Peter E. Doms, Douglas S. Abraham, James R. Lesh, Adrian J. Hooke, Richard J. Doyle, Robert J. Cesarone
Publikováno v:
Acta Astronautica. 58:411-421
Space exploration missions are undergoing a significant transformation as are the expectations of their scientific investigators and the public who participate in these great voyages of exploration. The early reconnaissance missions are giving way to
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9ea7934a174a9f1105ce66bbc65d8b49
https://doi.org/10.1016/j.actaastro.2005.12.004
https://doi.org/10.1016/j.actaastro.2005.12.004
Publikováno v:
The Review of Laser Engineering. 24:1272-1277
The development of key technologies for an optical communications system for deep-space probes is discussed. Aspects of the technology include the pulse-position modulation technique for data transmission, a solid-state laser with a Nd:YAG crystal en
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::48f46973d2efd1ec1f93483935a4a274
https://doi.org/10.2184/lsj.24.1272
https://doi.org/10.2184/lsj.24.1272
Autor:
Homayoon Ansari, James R. Lesh
Publikováno v:
Applied optics. 30(11)
We demonstrate the feasibility of 3-D acoustooptic spectrum analysis with ultrahigh resolution. Sub-Hertz resolution is achieved by processing over a sequence of CCD frames.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::721dce0152229ce1c598766c5a9fafd5
https://pubmed.ncbi.nlm.nih.gov/20700296
https://pubmed.ncbi.nlm.nih.gov/20700296
Publikováno v:
Applied optics. 29(36)
A 2-D acoustooptic spectrum analyzer with the associated reference function generator and real-time image processor has been constructed. The operation of the analyzer and the experimental considerations for obtaining a high resolution spectrum in re
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b23a6989f1645cff40f74921f6f00b77
https://pubmed.ncbi.nlm.nih.gov/20577555
https://pubmed.ncbi.nlm.nih.gov/20577555
Autor:
James R. Lesh
Publikováno v:
Advanced Methods for Satellite and Deep Space Communications ISBN: 3540558519
As deep-space missions to the planets and other heavenly bodies acquire larger amounts of more sophisticated data, the demand for greater data return link communications capacity continues to increase. Past and current missions have stretched the cap
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5c59c6fcc1d2f5270715b5a3c5eba53d
https://doi.org/10.1007/bfb0036054
https://doi.org/10.1007/bfb0036054
Publikováno v:
Encyclopedia of Space Science and Technology
The Deep Space Network (DSN), managed by the California Institute of Technology's Jet Propulsion laboratory (JPL), has provided vital communications and navigation services for NASA deep space exploration missions for more than 40 years. The remarkab
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4c2ae3d5bd3895333a273a914f130024
https://doi.org/10.1002/0471263869.sst046
https://doi.org/10.1002/0471263869.sst046
Autor:
Steve P. Monacos, Sam Zingales, James W. Alexander, Hamid Hemmati, James R. Lesh, Tsun-Yee Yan, Chien-Chung Chen, Sukhan Lee
Publikováno v:
SPIE Proceedings.
The functional requirements and design drivers for an Optical Communications subsystem are assessed based on the system requirements imposed by a proposed Europa Orbiter mission. Unlike near-Earth optical communications systems, deep space missions i
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b5ecf6a0eb6f1124e434ac863850c48b
https://doi.org/10.1117/12.346174
https://doi.org/10.1117/12.346174
Autor:
Muthu Jeganathan, Abhijit Biswas, Matthew Jarrod Novak, Jon De Pew, David M. Erickson, Angel Portillo, James R. Lesh, Juan M. Ceniceros, Babak Sanii
Publikováno v:
SPIE Proceedings.
Mountain-top to mountain-top optical link experiments have been initiated at JPL, in order to perform a systems level evaluation of optical communications. Progress made so far is reported. The NASA, JPL developed optical communications demonstrator
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::26550ac0d46d70c0996105b548584d66
https://doi.org/10.1117/12.346202
https://doi.org/10.1117/12.346202
Publikováno v:
SPIE Proceedings.
Master-oscillator power-amplifier (MOPA) laser systems, for future lasercom terminals to be flown in space are being developed and characterized. These lasers fall into groups for applications in deep space and near earth (including GEO) orbiting sat
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9c56e890e5e3a1d716c7e00f0999f2ef
https://doi.org/10.1117/12.346189
https://doi.org/10.1117/12.346189
Autor:
Juan M. Ceniceros, James R. Lesh
Publikováno v:
SPIE Proceedings.
The Next Generation Space Telescope (NGST), part of NASA's Origins program, is a follow on to the Hubble Space Telescope expected to provide timely new science along with answering fundamental questions. NGST is a large diameter, infrared optimized t
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ce57647fbe3b52d20265a0b912e6b9c7
https://doi.org/10.1117/12.346180
https://doi.org/10.1117/12.346180