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A procedure to correct the effects of a relative delay between the quadrature components of radar signals at base band

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 ari... Full description

Journal Title: Annales Geophysicae 2005, Vol.23 (1), p.39-46
Main Author: GRYDELAND, T
Other Authors: HOZ, C. La , BELYEY, V , WESTMAN, A
Format: Electronic Article Electronic Article
Language: English
Subjects:
Publisher: Katlenburg-Lindau: European Geophysical Society
ID: ISSN: 0992-7689
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title: A procedure to correct the effects of a relative delay between the quadrature components of radar signals at base band
format: Article
creator:
  • GRYDELAND, T
  • HOZ, C. La
  • BELYEY, V
  • WESTMAN, A
subjects:
  • Analysis
  • Cosmic physics
  • Earth Sciences
  • Earth, ocean, space
  • Exact sciences and technology
  • External geophysics
  • Geophysics
  • Ocean, Atmosphere
  • Physics
  • Physics of the high neutral atmosphere
  • Physics of the ionosphere
  • Physics of the magnetosphere
  • Radar systems
  • Science
  • Sciences of the Universe
ispartof: Annales Geophysicae, 2005, Vol.23 (1), p.39-46
description: 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.
language: eng
source:
identifier: ISSN: 0992-7689
fulltext: no_fulltext
issn:
  • 0992-7689
  • 1432-0576
  • 1432-0576
url: Link


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titleA procedure to correct the effects of a relative delay between the quadrature components of radar signals at base band
creatorGRYDELAND, T ; HOZ, C. La ; BELYEY, V ; WESTMAN, A
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descriptionThe 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.
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languageeng
publisherKatlenburg-Lindau: European Geophysical Society
subjectAnalysis ; Cosmic physics ; Earth Sciences ; Earth, ocean, space ; Exact sciences and technology ; External geophysics ; Geophysics ; Ocean, Atmosphere ; Physics ; Physics of the high neutral atmosphere ; Physics of the ionosphere ; Physics of the magnetosphere ; Radar systems ; Science ; Sciences of the Universe
ispartofAnnales Geophysicae, 2005, Vol.23 (1), p.39-46
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descriptionThe 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.
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abstractThe 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.
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pubEuropean Geophysical Society
doi10.5194/angeo-23-39-2005
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