chilunfold

This program unfolds the velocity in a scanning 3-GHz netCDF data file. It operates on the v2 variable (the Doppler velocity calculated using both the H and V pulses, which folds at ±15 m s-1), and overwrites v1 with a new variable, v_unfolded. The original v2 is left unchanged except that it is renamed v. The v_unfolded parameter also has noise removed, and this is used as a mask to also clean up phi_dp, if present.

The algorithms to unfold and clean the data were written in Fortran by Danny Chapman, originally as `mex' functions for Matlab. The user should be aware that they sometimes unfold regions incorrectly, which is why the original folded data is left in the file. A few modifications to the algorithm by Robin Hogan have reduced the frequency that this occurs. The algorithm is in the libdan directory.

Usage

chilunfold
Without any arguments, chilunfold displays some basic usage information.
chilunfold file1.dat [file2.dat ...]
Unfolding is applied to any number of files given on the command line.