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Characterizing uncertainties in Doppler measurements using a displaced phase center antenna configuration on spaceborne weather radars




Graniello, Sergio Daniel, author
Chandrasekar, V, advisor
Cheney, Margaret, committee member
Chavéz, José, committee member

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The work presented in this thesis explores a new antenna configuration for accurately obtaining Doppler measurements from a spaceborne weather radar. Spaceborne weather radars have the potential to observe the dynamic process of the atmosphere at a global scale. Unlike ground and airborne radar, spaceborne radars have a unique challenge due to high orbital velocities, which result in a decorrelation of successive pulses, adversely affecting the ability to accurately measure the vertical Doppler velocity of clouds and precipitation [1]. A Displaced phase center antenna (DPCA) configuration has been proposed to mitigate the effects that high platform velocity have on single antenna system on a spaceborne weather radar. This work describes the concept of DPCA and its benefits over a single antenna system. This thesis characterizes the performance and its uncertainty for Doppler velocity estimation associated with the technique by simulating a spaceborne weather radar with DPCA. Through this process it was determined that DPCA removes the decorrelation effect that is associated with high platform velocities, resulting in a high accuracy in Doppler estimates in both homogeneous and non-homogeneous conditions.


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