Author: James I. Metcalf
Publisher:
ISBN:
Category : Doppler radar
Languages : en
Pages : 44

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Book Description

Author: James I. Metcalf
Publisher:
ISBN:
Category : Doppler radar
Languages : en
Pages : 46

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ISBN:
Category : Aeronautics
Languages : en
Pages : 1038

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ISBN:
Category : Astrophysics
Languages : en
Pages : 492

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ISBN:
Category : Environmental geology
Languages : en
Pages : 116

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ISBN:
Category : Atmosphere
Languages : en
Pages : 1052

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ISBN:
Category : Science
Languages : en
Pages : 808

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Author: James I. Metcalf
Publisher:
ISBN:
Category : Atmospheric electricity
Languages : en
Pages : 38

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Book Description
The changing orientations of hydrometeors due to rapidly changing electric fields in clouds have been observed for the first time at a radar wavelength of 11 cm (S-band) with the polarimetric Doppler radar operated in Sudbury, MA by the Geophysics Directorate of Phillips Laboratory. During 1991 the radar was operated in a half-matrix mode, transmitting a signal of right circular polarization and receiving signals of right and left circular polarization. Observations of electrified storms on nine days during the spring and summer of 1991 revealed several occurrences of lightning that coincided with significant changes of the circular depolarization ratio (CDR), the cross-correlation, or the phase of the cross-covariance of the two received signals. We observed changes up to 2 dB in CDR, 50% in cross-correlation, and 40° in phase. However, many occurrences of lightning observed by radar were not accompanied by detectable changes of hydrometeor orientations, and we did not observe the cyclical changes of the polarimetric quantities that have been observed elsewhere with radars of shorter wavelength. We present examples of our observations and discuss implications for future measurements with this radar.

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Category : Government reports announcements & index
Languages : en
Pages : 1232

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Book Description

Author: V. N. Bringi
Publisher: Cambridge University Press
ISBN: 9780521623841
Category : Science
Languages : en
Pages : 666

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Book Description
This 2001 book provides a detailed introduction to the principles of Doppler and polarimetric radar, focusing in particular on their use in the analysis of weather systems. The design features and operation of practical radar systems are highlighted throughout the book in order to illustrate important theoretical foundations. The authors begin by discussing background topics such as electromagnetic scattering, polarization, and wave propagation. They then deal in detail with the engineering aspects of pulsed Doppler polarimetric radar, including the relevant signal theory, spectral estimation techniques, and noise considerations. They close by examining a range of key applications in meteorology and remote sensing. The book will be of great use to graduate students of electrical engineering and atmospheric science as well as to practitioners involved in the applications of polarimetric radar systems.