Decoding of Barker-coded incoherent scatter measurements by means ofmathematical inversion
International audience The standard analysis of Barker-coded incoherent scatter experiments is based on a matched filter with an impulse response which is a mirror image of the code itself. The method produces small sidelobes which cause contamination from regions outside the nominal range gate. A c...
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ftccsdartic:oai:HAL:hal-00317202v1 2023-11-12T04:16:38+01:00 Decoding of Barker-coded incoherent scatter measurements by means ofmathematical inversion Damtie, B. Lehtinen, M. S. Nygrén, T. Department of Physical Sciences Oulu University of Oulu Sodankylä Geophysical Observatory 2004-01-01 https://hal.science/hal-00317202 https://hal.science/hal-00317202/document https://hal.science/hal-00317202/file/angeo-22-3-2004.pdf en eng HAL CCSD European Geosciences Union hal-00317202 https://hal.science/hal-00317202 https://hal.science/hal-00317202/document https://hal.science/hal-00317202/file/angeo-22-3-2004.pdf info:eu-repo/semantics/OpenAccess ISSN: 0992-7689 EISSN: 1432-0576 Annales Geophysicae https://hal.science/hal-00317202 Annales Geophysicae, 2004, 22 (1), pp.3-13 [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/article Journal articles 2004 ftccsdartic 2023-10-21T23:07:42Z International audience The standard analysis of Barker-coded incoherent scatter experiments is based on a matched filter with an impulse response which is a mirror image of the code itself. The method produces small sidelobes which cause contamination from regions outside the nominal range gate. A corresponding effect is also encountered in the lag direction, where individual lag estimates are biased by the variation of the plasma autocorrelation function around the nominal lag value. The present paper introduces a new method of analysing Barker-coded experiments by means of stochastic inversion. Since it does not apply a decoding filter, it does not suffer from drawbacks caused by the sidelobes of the range ambiguity function. The method combines the profile of each full lag and a number of surrounding fractional lags into a single inversion problem. Error analysis also indicates that the statistical accuracy given by inversion is better than that obtained by means of standard decoding. Furthermore, the inversion method gives a possibility to reduce the bias due to the variation of the autocorrelation around the nominal lag. In this paper the method is described and applied to data obtained by means of the EISCAT Svalbard radar. In addition, it is shown that mathematical inversion can be used instead of the the conventional height integration. Key words. Radio science (ionospheric physics; signal processing; instruments and techniques) Article in Journal/Newspaper EISCAT Svalbard Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Svalbard |
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Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
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ftccsdartic |
language |
English |
topic |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
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[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences Damtie, B. Lehtinen, M. S. Nygrén, T. Decoding of Barker-coded incoherent scatter measurements by means ofmathematical inversion |
topic_facet |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience The standard analysis of Barker-coded incoherent scatter experiments is based on a matched filter with an impulse response which is a mirror image of the code itself. The method produces small sidelobes which cause contamination from regions outside the nominal range gate. A corresponding effect is also encountered in the lag direction, where individual lag estimates are biased by the variation of the plasma autocorrelation function around the nominal lag value. The present paper introduces a new method of analysing Barker-coded experiments by means of stochastic inversion. Since it does not apply a decoding filter, it does not suffer from drawbacks caused by the sidelobes of the range ambiguity function. The method combines the profile of each full lag and a number of surrounding fractional lags into a single inversion problem. Error analysis also indicates that the statistical accuracy given by inversion is better than that obtained by means of standard decoding. Furthermore, the inversion method gives a possibility to reduce the bias due to the variation of the autocorrelation around the nominal lag. In this paper the method is described and applied to data obtained by means of the EISCAT Svalbard radar. In addition, it is shown that mathematical inversion can be used instead of the the conventional height integration. Key words. Radio science (ionospheric physics; signal processing; instruments and techniques) |
author2 |
Department of Physical Sciences Oulu University of Oulu Sodankylä Geophysical Observatory |
format |
Article in Journal/Newspaper |
author |
Damtie, B. Lehtinen, M. S. Nygrén, T. |
author_facet |
Damtie, B. Lehtinen, M. S. Nygrén, T. |
author_sort |
Damtie, B. |
title |
Decoding of Barker-coded incoherent scatter measurements by means ofmathematical inversion |
title_short |
Decoding of Barker-coded incoherent scatter measurements by means ofmathematical inversion |
title_full |
Decoding of Barker-coded incoherent scatter measurements by means ofmathematical inversion |
title_fullStr |
Decoding of Barker-coded incoherent scatter measurements by means ofmathematical inversion |
title_full_unstemmed |
Decoding of Barker-coded incoherent scatter measurements by means ofmathematical inversion |
title_sort |
decoding of barker-coded incoherent scatter measurements by means ofmathematical inversion |
publisher |
HAL CCSD |
publishDate |
2004 |
url |
https://hal.science/hal-00317202 https://hal.science/hal-00317202/document https://hal.science/hal-00317202/file/angeo-22-3-2004.pdf |
geographic |
Svalbard |
geographic_facet |
Svalbard |
genre |
EISCAT Svalbard |
genre_facet |
EISCAT Svalbard |
op_source |
ISSN: 0992-7689 EISSN: 1432-0576 Annales Geophysicae https://hal.science/hal-00317202 Annales Geophysicae, 2004, 22 (1), pp.3-13 |
op_relation |
hal-00317202 https://hal.science/hal-00317202 https://hal.science/hal-00317202/document https://hal.science/hal-00317202/file/angeo-22-3-2004.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1782333707103764480 |