Campbell Scientific PWS100 Present Weather Sensor - Manual (Page 125)

Appendix D. Software Flowchart
Filter FFT
Channel 1
Autocorrelation
and DC removal
Filter FFT
Channel 2
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
Determine
average
correlation velocity
value
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
H
Check autocorrelation
velocities with narrow range
are within tolerance?
End processing
N
Y
K
Store average
correlation
velocity value
Non-polycrystalline processing
D-3