Ground clutter cancellation in incoherent radars: solutions for EISCAT Svalbard radar
International audience 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 sign...
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ftinsu:oai:HAL:hal-00316795v1 2023-11-12T04:16:36+01:00 Ground clutter cancellation in incoherent radars: solutions for EISCAT Svalbard radar Turunen, T. Markkanen, J. van Eyken, A. P. EISCAT Scientific Association EISCAT Scientific Association Finland 2000 https://hal.science/hal-00316795 https://hal.science/hal-00316795/document https://hal.science/hal-00316795/file/angeo-18-1242-2000.pdf en eng HAL CCSD European Geosciences Union hal-00316795 https://hal.science/hal-00316795 https://hal.science/hal-00316795/document https://hal.science/hal-00316795/file/angeo-18-1242-2000.pdf info:eu-repo/semantics/OpenAccess ISSN: 0992-7689 EISSN: 1432-0576 Annales Geophysicae https://hal.science/hal-00316795 Annales Geophysicae, 2000, 18 (9), pp.1242-1247 [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 2000 ftinsu 2023-10-25T16:25:30Z International audience 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 Institut national des sciences de l'Univers: HAL-INSU Hagfors ENVELOPE(13.290,13.290,65.822,65.822) Svalbard |
institution |
Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
spellingShingle |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences Turunen, T. Markkanen, J. van Eyken, A. P. Ground clutter cancellation in incoherent radars: solutions for EISCAT Svalbard radar |
topic_facet |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience 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) |
author2 |
EISCAT Scientific Association EISCAT Scientific Association Finland |
format |
Article in Journal/Newspaper |
author |
Turunen, T. Markkanen, J. van Eyken, A. P. |
author_facet |
Turunen, T. Markkanen, J. van Eyken, A. P. |
author_sort |
Turunen, T. |
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 |
HAL CCSD |
publishDate |
2000 |
url |
https://hal.science/hal-00316795 https://hal.science/hal-00316795/document https://hal.science/hal-00316795/file/angeo-18-1242-2000.pdf |
long_lat |
ENVELOPE(13.290,13.290,65.822,65.822) |
geographic |
Hagfors Svalbard |
geographic_facet |
Hagfors Svalbard |
genre |
EISCAT Svalbard |
genre_facet |
EISCAT Svalbard |
op_source |
ISSN: 0992-7689 EISSN: 1432-0576 Annales Geophysicae https://hal.science/hal-00316795 Annales Geophysicae, 2000, 18 (9), pp.1242-1247 |
op_relation |
hal-00316795 https://hal.science/hal-00316795 https://hal.science/hal-00316795/document https://hal.science/hal-00316795/file/angeo-18-1242-2000.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1782333655416307712 |