High resolution general purpose D-layer experiment for EISCAT incoherent scatter radars using selected set of random codes
The ionospheric D-layer is a narrow bandwidth radar target often with a very small scattering cross section. The target autocorrelation function can be obtained by transmitting a series of relatively short coded pulses and computing the correlation between data obtained from different pulses. The sp...
Published in: | Annales Geophysicae |
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00035877 2023-05-15T16:04:48+02:00 High resolution general purpose D-layer experiment for EISCAT incoherent scatter radars using selected set of random codes Turunen, T. Westman, A. Häggström, I. Wannberg, G. 2002-09 electronic https://doi.org/10.5194/angeo-20-1469-2002 https://noa.gwlb.de/receive/cop_mods_00035877 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00035831/angeo-20-1469-2002.pdf https://angeo.copernicus.org/articles/20/1469/2002/angeo-20-1469-2002.pdf eng eng Copernicus Publications Annales Geophysicae -- http://www.bibliothek.uni-regensburg.de/ezeit/?1458425 -- https://www.ann-geophys.net/ -- https://www.ann-geophys.net/volumes.html -- http://link.springer.com/journal/585 -- 1432-0576 https://doi.org/10.5194/angeo-20-1469-2002 https://noa.gwlb.de/receive/cop_mods_00035877 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00035831/angeo-20-1469-2002.pdf https://angeo.copernicus.org/articles/20/1469/2002/angeo-20-1469-2002.pdf uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2002 ftnonlinearchiv https://doi.org/10.5194/angeo-20-1469-2002 2022-02-08T22:44:20Z The ionospheric D-layer is a narrow bandwidth radar target often with a very small scattering cross section. The target autocorrelation function can be obtained by transmitting a series of relatively short coded pulses and computing the correlation between data obtained from different pulses. The spatial resolution should be as high as possible and the spatial side lobes of the codes used should be as small as possible. However, due to the short pulse repetition period (in the order of milliseconds) at any instant, the radar receives detectable scattered signals not only from the pulse illuminating the D-region but also from 3–5 ambiguous-range pulses, which makes it difficult to produce a reliable estimate near zero lag of the autocorrelation function. A new experimental solution to this measurement problem, using a selected set of 40-bit random codes with 4 µs elements giving 600 m spatial resolution is presented. The zero lag is approximated by dividing the pulse into two 20-bit codes and computing the correlation between those two pulses. The lowest altitudes of the E-layer are measured by dividing the pulse into 5 pieces of 8 bits, which allows for computation of 4 lags. In addition, coherent integration of data from four pulses is used for obtaining separately the autocorrelation function estimate for the lowest altitudes and in cases when the target contains structures with a long coherence time. Design details and responses of the experiment are given, and analysed test data are shown. Key words. Radio science (signal processing); Ionosphere (plasma temperature and density; instruments and techniques) Article in Journal/Newspaper EISCAT Niedersächsisches Online-Archiv NOA Annales Geophysicae 20 9 1469 1477 |
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Niedersächsisches Online-Archiv NOA |
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English |
topic |
article Verlagsveröffentlichung |
spellingShingle |
article Verlagsveröffentlichung Turunen, T. Westman, A. Häggström, I. Wannberg, G. High resolution general purpose D-layer experiment for EISCAT incoherent scatter radars using selected set of random codes |
topic_facet |
article Verlagsveröffentlichung |
description |
The ionospheric D-layer is a narrow bandwidth radar target often with a very small scattering cross section. The target autocorrelation function can be obtained by transmitting a series of relatively short coded pulses and computing the correlation between data obtained from different pulses. The spatial resolution should be as high as possible and the spatial side lobes of the codes used should be as small as possible. However, due to the short pulse repetition period (in the order of milliseconds) at any instant, the radar receives detectable scattered signals not only from the pulse illuminating the D-region but also from 3–5 ambiguous-range pulses, which makes it difficult to produce a reliable estimate near zero lag of the autocorrelation function. A new experimental solution to this measurement problem, using a selected set of 40-bit random codes with 4 µs elements giving 600 m spatial resolution is presented. The zero lag is approximated by dividing the pulse into two 20-bit codes and computing the correlation between those two pulses. The lowest altitudes of the E-layer are measured by dividing the pulse into 5 pieces of 8 bits, which allows for computation of 4 lags. In addition, coherent integration of data from four pulses is used for obtaining separately the autocorrelation function estimate for the lowest altitudes and in cases when the target contains structures with a long coherence time. Design details and responses of the experiment are given, and analysed test data are shown. Key words. Radio science (signal processing); Ionosphere (plasma temperature and density; instruments and techniques) |
format |
Article in Journal/Newspaper |
author |
Turunen, T. Westman, A. Häggström, I. Wannberg, G. |
author_facet |
Turunen, T. Westman, A. Häggström, I. Wannberg, G. |
author_sort |
Turunen, T. |
title |
High resolution general purpose D-layer experiment for EISCAT incoherent scatter radars using selected set of random codes |
title_short |
High resolution general purpose D-layer experiment for EISCAT incoherent scatter radars using selected set of random codes |
title_full |
High resolution general purpose D-layer experiment for EISCAT incoherent scatter radars using selected set of random codes |
title_fullStr |
High resolution general purpose D-layer experiment for EISCAT incoherent scatter radars using selected set of random codes |
title_full_unstemmed |
High resolution general purpose D-layer experiment for EISCAT incoherent scatter radars using selected set of random codes |
title_sort |
high resolution general purpose d-layer experiment for eiscat incoherent scatter radars using selected set of random codes |
publisher |
Copernicus Publications |
publishDate |
2002 |
url |
https://doi.org/10.5194/angeo-20-1469-2002 https://noa.gwlb.de/receive/cop_mods_00035877 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00035831/angeo-20-1469-2002.pdf https://angeo.copernicus.org/articles/20/1469/2002/angeo-20-1469-2002.pdf |
genre |
EISCAT |
genre_facet |
EISCAT |
op_relation |
Annales Geophysicae -- http://www.bibliothek.uni-regensburg.de/ezeit/?1458425 -- https://www.ann-geophys.net/ -- https://www.ann-geophys.net/volumes.html -- http://link.springer.com/journal/585 -- 1432-0576 https://doi.org/10.5194/angeo-20-1469-2002 https://noa.gwlb.de/receive/cop_mods_00035877 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00035831/angeo-20-1469-2002.pdf https://angeo.copernicus.org/articles/20/1469/2002/angeo-20-1469-2002.pdf |
op_rights |
uneingeschränkt info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/angeo-20-1469-2002 |
container_title |
Annales Geophysicae |
container_volume |
20 |
container_issue |
9 |
container_start_page |
1469 |
op_container_end_page |
1477 |
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1766400439397384192 |