Description
The GPS-measured fall velocity is a good discriminator for the quality of the GPS-derived horizontal wind. This check compares the GPS vertical velocity with both the hydrostatically derived vertical velocity and the theoretical fall velocity. Differences are calculated at each point between the GPS vertical velocity and the hydrostatic vertical velocity, and between the GPS vertical velocity and the theoretical fall rate. If the difference in both comparisons is greater than the check limit (WindVVDelta config item), then the GPS horizontal winds are removed at that point.
Note that a separate pressure series is used for the hydrostatically derived fall velocity, so that it can have a different smoothing wavelength (WindVVPresWL config item) than the standard pressure series. This allows it to be tuned in order to catch the expected variance in the GPS-measured vertical velocity.
Formula
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