Wind Calibration and Processing Programs
All the calibration and processing software module's described below are executed from the shell prompt. Type the name of the processing module to get a list of input parameters for that program. Each software module is started with a “csh” script that calls an IDL subroutine.
alpha_cal
Calibration routine to determine the alpha angle calibration coefficients.
beta_cal
Calibration routine to determine the beta angle calibration coefficients.
hoffset_cal
Calibration routine to determine the offset between the aircraft heading angle and track angle.
winds_cal
Calibration routine to determine the pitot nose and pitot wing calibration coefficients. Uses reverse tracks flight data.
winds_file
Data Level 3 processing module used to create the “*.wind.txt” and “*.SBET.winds.txt” data file.
Library Subroutines
The “citation_constants” subroutine is used by all the calibration and processing subroutines to obtain the calibration coefficients. When ever new calibration coefficients are computed they need to be updated in the “citation_constants.pro” subroutine. The flight date is used by the “citation_constants.pro” subroutine to determine the correct calibration coefficient.
To calculate all new coefficients, start with “alpha_cal”, determine new alpha angle calibration coefficients, update “citation_constants.pro”, run “beta_cal”, update “citation_constants.pro”, run “wind_cal”, update “citation_constants.pro”. Repeat the above procedure until the calibration coefficients converge.