Campbell Scientific PWS100 Present Weather Sensor - Manual (Page 126)

Appendix D. Software Flowchart
Filter FFT
Channel 1
Autocorrelation
and DC removal
Inverse FFT and
select real
component
Find correlation
peak position
Select data width
and clip vales
(limit range)
Shifted and mixed
multi-point data
interpolation
(polynomial fit)
Determine particle
velocity
G
Check autocorrelation
velocities with wide range
are within tolerance?
N
Y
I
Retrieve stored
pedestal width
data
Determine particle
velocity from
pedestal width
channel 1
Check pedestal width
velocities with wide range
are within tolerance?
End processing
N
Y
Determine particle
velocity from
pedestal width
channel 2
Determine size
from signal
amplitude
J
Store average
correlation
velocity value
Take the minimum
velocity
Polycrystalline processing
D-4