Ground clutter cancellation in incoherent radars: solutions for EISCAT Svalbard radar
Incoherent scatter radars measure ionosphere parameters using modified Thomson scatter from free electrons in the target (see e.g. Hagfors, 1997). The integrated cross section of the ionospheric scatterers is extremely small and the measurements can easily be disturbed by signals returned by unwante...
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ftdoajarticles:oai:doaj.org/article:12f35958075f4ca49ea72da241a77c41 2023-05-15T16:04:34+02:00 Ground clutter cancellation in incoherent radars: solutions for EISCAT Svalbard radar T. Turunen J. Markkanen A. P. van Eyken 2000-09-01T00:00:00Z https://doi.org/10.1007/s00585-000-1242-0 https://doaj.org/article/12f35958075f4ca49ea72da241a77c41 EN eng Copernicus Publications https://www.ann-geophys.net/18/1242/2000/angeo-18-1242-2000.pdf https://doaj.org/toc/0992-7689 https://doaj.org/toc/1432-0576 doi:10.1007/s00585-000-1242-0 0992-7689 1432-0576 https://doaj.org/article/12f35958075f4ca49ea72da241a77c41 Annales Geophysicae, Vol 18, Pp 1242-1247 (2000) Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 article 2000 ftdoajarticles https://doi.org/10.1007/s00585-000-1242-0 2022-12-31T09:41:02Z Incoherent scatter radars measure ionosphere parameters using modified Thomson scatter from free electrons in the target (see e.g. Hagfors, 1997). The integrated cross section of the ionospheric scatterers is extremely small and the measurements can easily be disturbed by signals returned by unwanted targets. Ground clutter signals, entering via the antenna side lobes, can render measurements at the nearest target ranges totally impossible. The EISCAT Svalbard Radar (ESR), which started measurements in 1996, suffers from severe ground clutter and the ionosphere cannot be measured in any simple manner at ranges less than about 120–150 km, depending on the modulation employed. If the target and clutter signals have different, and clearly identifiable, properties then, in principle, there are always ways to eliminate the clutter. In incoherent scatter measurements, differences in the coherence times of the wanted and unwanted signals can be used for clutter cancellation. The clutter cancellation must be applied to all modulations, usually alternating codes in modern experiments, used for shorter ranges. Excellent results have been obtained at the ESR using a simple pulse-to-pulse clutter subtraction method, but there are also other possibilities. 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 Hagfors ENVELOPE(13.290,13.290,65.822,65.822) Annales Geophysicae 18 9 1242 1247 |
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 T. Turunen J. Markkanen A. P. van Eyken Ground clutter cancellation in incoherent radars: solutions for EISCAT Svalbard radar |
topic_facet |
Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 |
description |
Incoherent scatter radars measure ionosphere parameters using modified Thomson scatter from free electrons in the target (see e.g. Hagfors, 1997). The integrated cross section of the ionospheric scatterers is extremely small and the measurements can easily be disturbed by signals returned by unwanted targets. Ground clutter signals, entering via the antenna side lobes, can render measurements at the nearest target ranges totally impossible. The EISCAT Svalbard Radar (ESR), which started measurements in 1996, suffers from severe ground clutter and the ionosphere cannot be measured in any simple manner at ranges less than about 120–150 km, depending on the modulation employed. If the target and clutter signals have different, and clearly identifiable, properties then, in principle, there are always ways to eliminate the clutter. In incoherent scatter measurements, differences in the coherence times of the wanted and unwanted signals can be used for clutter cancellation. The clutter cancellation must be applied to all modulations, usually alternating codes in modern experiments, used for shorter ranges. Excellent results have been obtained at the ESR using a simple pulse-to-pulse clutter subtraction method, but there are also other possibilities. Key words: Radio science (ionospheric physics; signal processing; instruments and techniques) |
format |
Article in Journal/Newspaper |
author |
T. Turunen J. Markkanen A. P. van Eyken |
author_facet |
T. Turunen J. Markkanen A. P. van Eyken |
author_sort |
T. Turunen |
title |
Ground clutter cancellation in incoherent radars: solutions for EISCAT Svalbard radar |
title_short |
Ground clutter cancellation in incoherent radars: solutions for EISCAT Svalbard radar |
title_full |
Ground clutter cancellation in incoherent radars: solutions for EISCAT Svalbard radar |
title_fullStr |
Ground clutter cancellation in incoherent radars: solutions for EISCAT Svalbard radar |
title_full_unstemmed |
Ground clutter cancellation in incoherent radars: solutions for EISCAT Svalbard radar |
title_sort |
ground clutter cancellation in incoherent radars: solutions for eiscat svalbard radar |
publisher |
Copernicus Publications |
publishDate |
2000 |
url |
https://doi.org/10.1007/s00585-000-1242-0 https://doaj.org/article/12f35958075f4ca49ea72da241a77c41 |
long_lat |
ENVELOPE(13.290,13.290,65.822,65.822) |
geographic |
Svalbard Hagfors |
geographic_facet |
Svalbard Hagfors |
genre |
EISCAT Svalbard |
genre_facet |
EISCAT Svalbard |
op_source |
Annales Geophysicae, Vol 18, Pp 1242-1247 (2000) |
op_relation |
https://www.ann-geophys.net/18/1242/2000/angeo-18-1242-2000.pdf https://doaj.org/toc/0992-7689 https://doaj.org/toc/1432-0576 doi:10.1007/s00585-000-1242-0 0992-7689 1432-0576 https://doaj.org/article/12f35958075f4ca49ea72da241a77c41 |
op_doi |
https://doi.org/10.1007/s00585-000-1242-0 |
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Annales Geophysicae |
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18 |
container_issue |
9 |
container_start_page |
1242 |
op_container_end_page |
1247 |
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