Decoding of Barker-coded incoherent scatter measurements by means ofmathematical inversion
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...
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ftdoajarticles:oai:doaj.org/article:c89067e3100f4e0498f525aa166a45af 2023-05-15T16:04:45+02:00 Decoding of Barker-coded incoherent scatter measurements by means ofmathematical inversion B. Damtie M. S. Lehtinen T. Nygrén 2004-01-01T00:00:00Z https://doi.org/10.5194/angeo-22-3-2004 https://doaj.org/article/c89067e3100f4e0498f525aa166a45af EN eng Copernicus Publications https://www.ann-geophys.net/22/3/2004/angeo-22-3-2004.pdf https://doaj.org/toc/0992-7689 https://doaj.org/toc/1432-0576 doi:10.5194/angeo-22-3-2004 0992-7689 1432-0576 https://doaj.org/article/c89067e3100f4e0498f525aa166a45af Annales Geophysicae, Vol 22, Pp 3-13 (2004) Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 article 2004 ftdoajarticles https://doi.org/10.5194/angeo-22-3-2004 2022-12-31T01:33:23Z 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 Directory of Open Access Journals: DOAJ Articles Svalbard Annales Geophysicae 22 1 3 13 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 |
spellingShingle |
Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 B. Damtie M. S. Lehtinen T. Nygrén Decoding of Barker-coded incoherent scatter measurements by means ofmathematical inversion |
topic_facet |
Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 |
description |
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) |
format |
Article in Journal/Newspaper |
author |
B. Damtie M. S. Lehtinen T. Nygrén |
author_facet |
B. Damtie M. S. Lehtinen T. Nygrén |
author_sort |
B. Damtie |
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 |
Copernicus Publications |
publishDate |
2004 |
url |
https://doi.org/10.5194/angeo-22-3-2004 https://doaj.org/article/c89067e3100f4e0498f525aa166a45af |
geographic |
Svalbard |
geographic_facet |
Svalbard |
genre |
EISCAT Svalbard |
genre_facet |
EISCAT Svalbard |
op_source |
Annales Geophysicae, Vol 22, Pp 3-13 (2004) |
op_relation |
https://www.ann-geophys.net/22/3/2004/angeo-22-3-2004.pdf https://doaj.org/toc/0992-7689 https://doaj.org/toc/1432-0576 doi:10.5194/angeo-22-3-2004 0992-7689 1432-0576 https://doaj.org/article/c89067e3100f4e0498f525aa166a45af |
op_doi |
https://doi.org/10.5194/angeo-22-3-2004 |
container_title |
Annales Geophysicae |
container_volume |
22 |
container_issue |
1 |
container_start_page |
3 |
op_container_end_page |
13 |
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1766400381550592000 |