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Archive
by Parent du Châtelet, J., Boudjabi, C., Besson, L. and Caumont, O.
Abstract:
Refractivity measurements in the boundary layer by precipitation radar could be useful for convection prediction. Until now such measurements have only been performed by coherent radars, but European weather radars are mostly equipped with noncoherent magnetron transmitters for which the phase and frequency may vary. In this paper, the authors give an analytical expression of the refractivity measurement by a noncoherent drifting-frequency magnetron radar and validate it by comparing with in situ measurements. The main conclusion is that, provided the necessary corrections are applied, the measurement can be successfully performed with a noncoherent radar. The correction factor mainly depends on the local-oscillator frequency variation, which is known perfectly. A second-order error, proportional to the transmitted frequency variation, can be neglected as long as this change remains small.
Reference:
Parent du Châtelet, J., Boudjabi, C., Besson, L. and Caumont, O., 2012: Errors caused by long-term drifts of magnetron frequencies for refractivity measurement with a radar: theoretical formulation and initial validationJournal of Atmospheric and Oceanic Technology, 29, 1428-1434.
Bibtex Entry:
@Article{Parent2012,
  Title                    = {Errors caused by long-term drifts of magnetron frequencies for refractivity measurement with a radar: theoretical formulation and initial validation},
  Author                   = {Parent du Châtelet, J. and Boudjabi, C. and Besson, L. and Caumont, O.},
  Journal                  = {Journal of Atmospheric and Oceanic Technology},
  Year                     = {2012},

  Month                    = {October},
  Number                   = {10},
  Pages                    = {1428-1434},
  Volume                   = {29},

  Abstract                 = {Refractivity measurements in the boundary layer by precipitation radar could be useful for convection prediction. Until now such measurements have only been performed by coherent radars, but European weather radars are mostly equipped with noncoherent magnetron transmitters for which the phase and frequency may vary. In this paper, the authors give an analytical expression of the refractivity measurement by a noncoherent drifting-frequency magnetron radar and validate it by comparing with in situ measurements. The main conclusion is that, provided the necessary corrections are applied, the measurement can be successfully performed with a noncoherent radar. The correction factor mainly depends on the local-oscillator frequency variation, which is known perfectly. A second-order error, proportional to the transmitted frequency variation, can be neglected as long as this change remains small.},
  Copublication            = {4: 4 Fr},
  Doi                      = {10.1175/JTECH-D-12-00070.1},
  ISSN                     = {0739-0572},
  Keywords                 = {Boundary layer; Moisture/moisture budget; Radars/Radar observations;},
  Owner                    = {hymexw},
  Researcherid-numbers     = {Caumont, Olivier/A-7453-2008},
  Timestamp                = {2015.10.09},
  Unique-id                = {ISI:000310256800002},
  Url                      = {http://journals.ametsoc.org/doi/abs/10.1175/JTECH-D-12-00070.1}
}