A procedure to correct the effects of a relative delay between the quadrature components of radar signals at base band
International audience The real and imaginary parts of baseband signals are obtained from a real narrow-band signal by quadrature mixing, i.e. by mixing with cosine and sine signals at the narrow band's selected center frequency. We address the consequences of a delay between the outputs of the...
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ftccsdartic:oai:HAL:hal-00317480v1 2023-11-12T04:16:38+01:00 A procedure to correct the effects of a relative delay between the quadrature components of radar signals at base band Grydeland, T. La Hoz, C. Belyey, V. Westman, A. Dept. of Physics University of Tromsø (UiT) EISCAT Scientific Association Sweden 2005-01-31 https://hal.science/hal-00317480 https://hal.science/hal-00317480/document https://hal.science/hal-00317480/file/angeo-23-39-2005.pdf en eng HAL CCSD European Geosciences Union hal-00317480 https://hal.science/hal-00317480 https://hal.science/hal-00317480/document https://hal.science/hal-00317480/file/angeo-23-39-2005.pdf info:eu-repo/semantics/OpenAccess ISSN: 0992-7689 EISSN: 1432-0576 Annales Geophysicae https://hal.science/hal-00317480 Annales Geophysicae, 2005, 23 (1), pp.39-46 [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 2005 ftccsdartic 2023-10-21T23:07:24Z International audience The real and imaginary parts of baseband signals are obtained from a real narrow-band signal by quadrature mixing, i.e. by mixing with cosine and sine signals at the narrow band's selected center frequency. We address the consequences of a delay between the outputs of the quadrature mixer, which arise when digital samples of the quadrature baseband signals are not synchronised, i.e. when the real and imaginary components have been shifted by one or more samples with respect to each other. Through analytical considerations and simulations of such an error on different synthetic signals, we show how this error can be expected to afflict different measurements. In addition, we show the effect of the error on actual incoherent scatter radar data obtained by two different digital receiver systems used in parallel at the EISCAT Svalbard Radar (ESR). The analytical considerations indicate a procedure to correct the error, albeit with some limitations due to a small singular region. We demonstrate the correction procedure on actually afflicted data and compare the results to simultaneously acquired unafflicted data. We also discuss the possible data analysis strategies, including some that avoid dealing directly with the singular region mentioned above. 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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Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
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 Grydeland, T. La Hoz, C. Belyey, V. Westman, A. A procedure to correct the effects of a relative delay between the quadrature components of radar signals at base band |
topic_facet |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience The real and imaginary parts of baseband signals are obtained from a real narrow-band signal by quadrature mixing, i.e. by mixing with cosine and sine signals at the narrow band's selected center frequency. We address the consequences of a delay between the outputs of the quadrature mixer, which arise when digital samples of the quadrature baseband signals are not synchronised, i.e. when the real and imaginary components have been shifted by one or more samples with respect to each other. Through analytical considerations and simulations of such an error on different synthetic signals, we show how this error can be expected to afflict different measurements. In addition, we show the effect of the error on actual incoherent scatter radar data obtained by two different digital receiver systems used in parallel at the EISCAT Svalbard Radar (ESR). The analytical considerations indicate a procedure to correct the error, albeit with some limitations due to a small singular region. We demonstrate the correction procedure on actually afflicted data and compare the results to simultaneously acquired unafflicted data. We also discuss the possible data analysis strategies, including some that avoid dealing directly with the singular region mentioned above. |
author2 |
Dept. of Physics University of Tromsø (UiT) EISCAT Scientific Association Sweden |
format |
Article in Journal/Newspaper |
author |
Grydeland, T. La Hoz, C. Belyey, V. Westman, A. |
author_facet |
Grydeland, T. La Hoz, C. Belyey, V. Westman, A. |
author_sort |
Grydeland, T. |
title |
A procedure to correct the effects of a relative delay between the quadrature components of radar signals at base band |
title_short |
A procedure to correct the effects of a relative delay between the quadrature components of radar signals at base band |
title_full |
A procedure to correct the effects of a relative delay between the quadrature components of radar signals at base band |
title_fullStr |
A procedure to correct the effects of a relative delay between the quadrature components of radar signals at base band |
title_full_unstemmed |
A procedure to correct the effects of a relative delay between the quadrature components of radar signals at base band |
title_sort |
procedure to correct the effects of a relative delay between the quadrature components of radar signals at base band |
publisher |
HAL CCSD |
publishDate |
2005 |
url |
https://hal.science/hal-00317480 https://hal.science/hal-00317480/document https://hal.science/hal-00317480/file/angeo-23-39-2005.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-00317480 Annales Geophysicae, 2005, 23 (1), pp.39-46 |
op_relation |
hal-00317480 https://hal.science/hal-00317480 https://hal.science/hal-00317480/document https://hal.science/hal-00317480/file/angeo-23-39-2005.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1782333703497711616 |