Airborne weather Doppler radar data (Doppler velocity) contains both meteorological signals and aircraft motion. In order to accurately obtain multiple Doppler wind synthesis, the aircraft motion must be properly removed from the Doppler velocities. Errors in the aircraft intertial navigation system and the radar pointing angles can be corrected using the methodology defined in the paper entitled: A Procedure To Correct Airborne Doppler Radar Data For Navigation Errors, Using The Echo Returned From the Earth Surface (Testud, et al 1995).
The corrections listed below were calculated using the Testud,et al methodology. These corrections were obtained primarily from calibration legs performed on each research flight, but in some cases are from other legs. The ground speed and drift corrections may vary from leg to leg during a flight. These corrections are tightly coupled with the tilt angle, and can be further refined on a leg-by-leg basis using the technique defined in Procedures to Improve the Accuracy of Airborne Doppler Radar Data (Bosart, et al 2002) It is strongly recommended that the user ensure that the ground residual velocities are near zero for the legs of interest before performing multiple Doppler analysis. If you have problems or questions regarding these procedures, please contact Wen-Chau Lee or Michael Bell.
Please see the Data Processing Overview section of the User Guide for further details on how to apply the corrections to the data.