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Ann. Geophys., 19, 837-843, 2001
www.ann-geophys.net/19/837/2001/
© European Geosciences Union 2001
An improvement of wind velocity estimation from radar Doppler spectra in the upper mesosphere
S. Takeda1,*, T. Nakamura1, and T. Tsuda1
1Radio Science Center for Space and Atmosphere, Kyoto University, Uji, Kyoto 611-0011, Japan
*Now at NTT DoCoMo, Inc.
Abstract. We have developed a new
parameter estimation method for Doppler wind spectra in the mesosphere observed
with an MST radar such as the MU radar in the DBS (Doppler Beam Swinging) mode.
Off-line incoherent integration of the Doppler spectra is carried out with a
new algorithm excluding contamination by strong meteor echoes. At the same
time, initial values on a least square fitting of the Gaussian function are
derived using a larger number of integration of the spectra for a longer time
and for multiple heights. As a result, a significant improvement has been
achieved with the probability of a successful fitting and parameter estimation
above 80 km. The top height for the wind estimation has been improved to around
95 km. A comparison between the MU radar and the High Resolution Doppler Imager
(HRDI) on the UARS satellite is shown and the capability of the new method for
a validation of a future satellite mission is suggested.
Key words. Meteorology and
atmospheric dynamics (middle atmosphere dynamics) – Radio science (remote
sensing; signal processing)
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