Zobrazeno 1 - 10
of 17
pro vyhledávání: '"Mikko Orispää"'
Autor:
Kirsti Kauristie, Mikko Orispää, Lassi Roininen, Anthea J. Coster, Juha Vierinen, Markku Lehtinen, Johannes Norberg, William C. Rideout
Publikováno v:
IEEE Transactions on Geoscience and Remote Sensing. 56:7009-7021
Source at https://doi.org/10.1109/TGRS.2018.2847026. In ionospheric tomography, the atmospheric electron density is reconstructed from different electron density related measurements, most often from ground-based measurements of satellite signals. Ty
The European Incoherent Scatter‐3D phased array radar system will be largely based on field‐programmable gate array (FPGA) firmware electronics that carry out the signal processing by using different digital filters. In this paper we have present
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a56d25407e721fa60e1690fe0da1937e
http://urn.fi/urn:nbn:fi-fe2019121348051
http://urn.fi/urn:nbn:fi-fe2019121348051
Autor:
Mikko Orispää, Johannes Norberg, Kirsti Kauristie, Markku Lehtinen, Lassi Roininen, Juha Vierinen, Ilkka Virtanen
Publikováno v:
Atmospheric Measurement Techniques, Vol 9, Iss 4, Pp 1859-1869 (2016)
Copernicus Publications
Copernicus Publications
We validate two-dimensional ionospheric tomography reconstructions against EISCAT incoherent scatter radar measurements. Our tomography method is based on Bayesian statistical inversion with prior distribution given by its mean and covariance. We emp
Publikováno v:
Annales Geophysicae, Vol 26, Iss 3, Pp 571-581 (2008)
Annales Geophysicae, Vol 26, Pp 571-581 (2008)
Scopus-Elsevier
Mikko Orispää
ResearcherID
Annales Geophysicae, Vol 26, Pp 571-581 (2008)
Scopus-Elsevier
Mikko Orispää
ResearcherID
The present standard EISCAT incoherent scatter experiments are based on alternating codes that are decoded in power domain by simple summation and subtraction operations. The signal is first digitised and then different lagged products are calculated
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::acb9e7115af4b34e2548b282797968d5
https://www.ann-geophys.net/26/571/2008/
https://www.ann-geophys.net/26/571/2008/
Publikováno v:
Journal of Geophysical Research: Space Physics. 120:2662-2674
We investigate geomagnetic activity at two high-latitude, two midlatitude, and two low-latitude stations of the northern hemisphere and find that the increasing trend of geomagnetic activity in 1914–2000 is considerably lower at the two midlatitude
Autor:
D. McKay-Bukowski, Markku Lehtinen, A. Schoenmakers, Jan Pieter de Reijer, Toivo Iinatti, Antti Kero, M. J. Norden, Nico Ebbendorf, Carl-Fredrik Enell, Mikko Orispää, Esa Turunen, Peter Gruppen, Henri Meulman, Olaf Wucknitz, Klaas Stuurwold, Markku Postila, Michiel A. Brentjens, T. Grit, Lassi Roininen, Juha Vierinen, Tero Raita, Thomas Ulich, Ilkka Virtanen, Richard Fallows, Marchel Gerbers
Publikováno v:
IEEE Transactions on Geoscience and Remote Sensing. 53:1440-1451
The Kilpisjarvi Atmospheric Imaging Receiver Array (KAIRA) is a dual array of omnidirectional VHF radio antennas located near Kilpisjarvi, Finland. It is operated by the Sodankyla Geophysical Observatory. It makes extensive use of the proven LOFAR an
18th EISCAT symposiumSession E3: Ionoshere/thermosphere/mesosphereMay 27 (Sat), NIPR Auditorium
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=jairo_______::71a55ca9ef56832cc6160738258fbb1f
http://id.nii.ac.jp/1291/00014110/
http://id.nii.ac.jp/1291/00014110/
Autor:
Frank D. Lind, Markku Lehtinen, Mikko Orispää, Juha Vierinen, Lassi Roininen, Philip J. Erickson, Ilkka Virtanen, William C. Rideout
Publikováno v:
Radio Science. 48:519-526
[1] We report first results of polyphase-coded incoherent scatter measurements at Millstone Hill. To our knowledge, these are the first incoherent scatter measurements with polyphase alternating codes of Markkanen et al. (2008) and optimal quadriphas
Publikováno v:
Inverse Problems & Imaging. 5:167-184
Publikováno v:
SCANDINAVIAN JOURNAL OF STATISTICS. 45(1):194
We consider fast lattice approximation methods for a solution of a certain stochastic non-local pseudodifferential operator equation. This equation defines a Matern class random field. We approximate the pseudodifferential operator with truncated Tay