Design And Development Of Doppler Wind Laser Radar For Atmospheric Application
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Describes the prototype 915 MHz Doppler/Interferometric boundary layer profiler developed at the National Center for Atmospheric Research. The characteristic of interest of the radar is its capability to simultaneously operate in a five beam Doppler beam swinging (DBS) mode and a radar interferometry (RI) mode through the use of multiple receiving channels connected to subsets of its antenna. Radar interferometry allows the estimation of a three-dimensional wind vector from a single beam direction while Doppler beam swinging combines the radial velocities measured in the multiple beam directions in order to derive the wind components. The authors present preliminary results from a June 1993 field project in Oklahoma. The profiles obtained with the DBS and the RI technique are compared. In particular, the accuracy of the RI method is assessed. It is investigated whether it represents a reliable alternative to the traditional Doppler technique when the latter is adversely affected by a non-homogeneous wind field.< >
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This paper will discuss the capabilities of airborne Doppler radar for atmospheric sciences research. The evaluation is based on airborne and ground based Doppler radar observations of convective storms. The capability of airborne Doppler radar to measure horizontal and vertical air motions is evaluated. Airborne Doppler radar is shown to be a viable tool for atmospheric sciences research.
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The successful deployments of the first spaceborne precipitation radar (TRMM/PR Ku-band, 1997 ) and spaceborne cloud radar (CloudSat/CPR W-band, 2006 ) have demonstrated the feasibility of monitoring atmospheric processes from space with vertical resolutions of a few hundred meters. Future missions being implemented (EarthCARE, W-band ) or envisaged (ACE, Ka- and W-band ) include use of coherent detection to measure the first moment of the Doppler spectrum to observe and analyze the dynamics of atmospheric systems. In this talk we discuss the main challenges and potentials of measuring the Doppler velocity of clouds and precipitation from space.
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In the near future satellite-borne Doppler wind lidars (DWL) should constitute one of the most important improvements in the instrumentation used to support weather forecasting and climatology in the near future, because they can be used to measure the three-dimensional structure of the wind field. The wind speed is estimated by means of the Doppler frequency shift of the lidar echo; therefore, Doppler shift estimation algorithms play a significant role in the performance budget of the system and are worth analyzing.
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