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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 32, issue 8
Ann. Geophys., 32, 899–909, 2014
© Author(s) 2014. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 32, 899–909, 2014
© Author(s) 2014. This work is distributed under
the Creative Commons Attribution 3.0 License.

Regular paper 05 Aug 2014

Regular paper | 05 Aug 2014

Three-dimensional radar imaging of atmospheric layer and turbulence structures using multiple receivers and multiple frequencies

J.-S. Chen1, J. Furumoto2, and M. Yamamoto2 J.-S. Chen et al.
  • 1Department of information and Network Communications, Chienkuo Technology University, Changhua, Taiwan
  • 2Research Institute for Sustainable Humanosphere, Kyoto University, Uji, Japan

Abstract. The pulsed, beamwidth-limited atmospheric radar suffers from a finite resolution volume, making it difficult to resolve the small-scale irregularity structure of refractive index (or clear-air turbulence) in the scattering region. Multi-receiver and multi-frequency imaging techniques were thus proposed to improve the spatial resolution of the measurements in the finite resolution volume. The middle and upper atmosphere radar (MUR; 34.85° N, 136.10° N) possesses the capabilities of 5 frequencies, ranging from 46 MHz to 47 MHz, and up to 25 receivers to carry out the imaging techniques. In this paper, we exhibit the three-dimensional (3-D) radar imaging utilizing five frequencies and 19 receivers of the MUR. The Capon method was employed for the process of imaging, and examinations of a wavy layer and turbulent structures were made, in which the spatial weighting effect on the imaging were mitigated beforehand. Information such as echo center and structure morphology in the resolution volume was then extracted. For example, the location distribution of echo centers could imply the traveling orientation of the wavy layer, which was correspondent with horizontal wind direction. Such information of wavy layer structure was more difficult to disclose without removal of the spatial weighting effect. This paper demonstrates an advanced application of 3-D radar imaging to some practical atmospheric phenomena.

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