1-byte Width Format (DB_WIDTH)
Spectrum width is computed from the unsigned output as:
The overall range is a fraction between 1/256 ... 255/256.
The code of 0 indicates that width data is not available at this range.
To convert the width to m/s, multiply by the unambiguous velocity. Thus the width has twice the resolution of the velocity.
This unambiguous velocity is not enlarged by the dual PRF scheme, but is halved by alternating polarization.
In data products, the value 255 indicates area not scanned. Note that width unambiguous velocities are not changed for dual PRF unfolding.