Zobrazeno 1 - 10
of 30
pro vyhledávání: '"Brent M. Ledvina"'
Autor:
Brent M. Ledvina
Publikováno v:
IEEE Transactions on Aerospace and Electronic Systems. 47:2921-2933
An algorithm has been developed that efficiently generates in-phase and quadrature carrier replicas over a range of Doppler shift frequencies and initial phase offsets. This algorithm provides a new method that aids in bit-wise parallel baseband mixi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::bd382744493eaf12ef3af4109a206441
https://doi.org/10.1109/taes.2011.6034674
https://doi.org/10.1109/taes.2011.6034674
Publikováno v:
IEEE Transactions on Aerospace and Electronic Systems. 46:1609-1623
A large set of equatorial ionospheric scintillation data has been compiled, used to characterize features of severe scintillation that impact Global Positioning System phase tracking, and used to develop a scintillation testbed for evaluating trackin
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::8009d005728a644c41cb9df16a6b80e9
https://doi.org/10.1109/taes.2010.5595582
https://doi.org/10.1109/taes.2010.5595582
Publikováno v:
Annales Geophysicae, Vol 24, Iss 5, Pp 1443-1453 (2006)
Annales Geophysicae, Vol 24, Pp 1443-1453 (2006)
Annales Geophysicae
Annales Geophysicae, European Geosciences Union, 2006, 24 (5), pp.1443-1453
Annales Geophysicae, Vol 24, Pp 1443-1453 (2006)
Annales Geophysicae
Annales Geophysicae, European Geosciences Union, 2006, 24 (5), pp.1443-1453
An all-sky imager was installed in Asmara, Eritrea (15.4° N, 38.9° E, 7° N dip) and used to monitor the OI 630-nm nightglow. Nine months of data were studied between September 2001 and May 2002, a time including the recent maximum in the solar act
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::825e2d598a4409a1a8e96c644510046d
https://doi.org/10.5194/angeo-24-1443-2006
https://doi.org/10.5194/angeo-24-1443-2006
Autor:
Paul M. Kintner, Brent M. Ledvina
Publikováno v:
Advances in Space Research. 35:788-811
This article is a review of Global Navigation Satellite Systems (GNSS) for space scientists who are interested in how GNSS signals and observables can be used to understand ionospheric dynamics and, conversely, how ionospheric dynamics affect the ope
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::926e9f7531e5475610a80ed8ac57c3be
https://doi.org/10.1016/j.asr.2004.12.076
https://doi.org/10.1016/j.asr.2004.12.076
Publikováno v:
Annales Geophysicae, Vol 22, Iss 9, Pp 3109-3121 (2004)
Annales Geophysicae, Vol 22, Pp 3109-3121 (2004)
Annales Geophysicae
Annales Geophysicae, European Geosciences Union, 2004, 22 (9), pp.3109-3121
Annales Geophysicae, Vol 22, Pp 3109-3121 (2004)
Annales Geophysicae
Annales Geophysicae, European Geosciences Union, 2004, 22 (9), pp.3109-3121
Over 300 nights of airglow and GPS scintillation data collected between January 2002 and August 2003 (a period near solar maximum) from the Haleakala Volcano, Hawaii are analyzed to obtain the seasonal trends for the occurrence of equatorial plasma b
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0d7ecb824709fe780c724856276a8667
http://www.ann-geophys.net/22/3109/2004/angeo-22-3109-2004.pdf
http://www.ann-geophys.net/22/3109/2004/angeo-22-3109-2004.pdf
Publikováno v:
IEEE Transactions on Wireless Communications. 3:1469-1473
A set of efficient algorithms for processing code-division multiple-access spread spectrum signals has been developed. They make use of bit-wise parallelism to process 32 samples simultaneously. These algorithms have been implemented in a real-time g
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5024a79b1830ee594a389940cf090527
https://doi.org/10.1109/twc.2004.833467
https://doi.org/10.1109/twc.2004.833467
Autor:
I. J. Kantor, K. N. Iyer, Fabiano S. Rodrigues, Hyosub Kil, Paul M. Kintner, M. A. Abdu, E. R. de Paula, Brent M. Ledvina
Publikováno v:
Advances in Space Research. 31:749-754
In a collaborative study, INPE and Cornell University have installed several Global Positioning System (GPS) based scintillation monitors over the Brazilian territory in order to study L Band scintillation. These scintillation monitors were developed
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::60cd59358f5df8b6ce72aa0aa5bea11d
https://doi.org/10.1016/s0273-1177(03)00048-6
https://doi.org/10.1016/s0273-1177(03)00048-6
Publikováno v:
Proceedings of the 2012 IEEE/ION Position, Location and Navigation Symposium.
Background theory, a reference design, and demonstration results are given for a Global Navigation Satellite System (GNSS) interference localization system comprising a distributed radio-frequency sensor network that simultaneously locates multiple i
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e2a7f78d1f9977894ceafc945b1bc306
https://doi.org/10.1109/plans.2012.6236915
https://doi.org/10.1109/plans.2012.6236915
Publikováno v:
Space Weather. 5
[1] Ionospheric scintillations are one of the earliest known effects of space weather. Caused by ionization density irregularities, scintillating signals change phase unexpectedly and vary rapidly in amplitude. GPS signals are vulnerable to ionospher
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::684f1d2f10f3a1a7e71cea2a7ac9e565
https://doi.org/10.1029/2006sw000260
https://doi.org/10.1029/2006sw000260
Publikováno v:
Radio Science. 41
[1] An experiment to measure equatorial amplitude scintillations on the geostationary Wide Area Augmentation System (WAAS) Satellite Based Augmentation System (SBAS) signal was conducted in Cachoeira Paulista (22.70°S, 45.01°W geographic coordinate
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::428ac92145c34b1cb3f17c12e6a56ab8
https://doi.org/10.1029/2005rs003405
https://doi.org/10.1029/2005rs003405