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WorkHorse H-ADCP Operation Manual
May
2015
EAR-Controlled Technology Subject to Restrictions Contained on the Cover Page.
Page 179
WU - Ping Weight
Purpose:
Selects the weight of each ping in an ensemble.
Format
WUn
Range
n = 0 (Box weighting), 1 (Triangle weighting)
Default
WU0
Recommended Setting.
The default setting for this command is recommended for most applications.
Description
The WU command allows the user to choose the ensemble weighting method. WU0 se-
lects Box weighting which is a simple average of the velocities in each ensemble. WU1 se-
lects Triangle weighting, where the first and last velocities are weighted the least, and the
middle velocity is weighted the most.
Example
For an ensemble of 5 pings, the weights would appear as below.
Table 29:
Ping Weights
Ping 1
Ping 2
Ping 3
Ping 4
Ping 5
WU0
1
1
1
1
1
WU1
1/3
2/3
1
2/3
1/3
The velocity reported for each ensemble is calculated as the sum of the weighted velocities
divided by the sum of the weights.
The
(Water reference layer) must be turned on when triangle weighting is used
(WU1).
WV – Ambiguity Velocity
Purpose
Sets the radial ambiguity velocity.
Format
WVnnn
Range
nnn = 2 to 700 cm/s
Default
WV185
Recommended Setting.
It is strongly recommended that the WV command be left at its’ default value
of 185.
Description
Set WV as low as possible to attain maximum performance, but not too low or ambiguity
errors will occur. Rule of thumb: Set WV to the maximum relative horizontal velocity be-
tween water-current speed and H-ADCP speed.
The WV command (ambiguity velocity setting) sets the maximum velocity that can be
measured along the beam when operating in water mode 1 (default mode). WV is used to
improve the single-ping standard deviation. The lower the value of the WV command, the
lower the single-ping standard deviation.
Set the WV command based on the maximum apparent velocity (ADCP motion plus water
speed). The following formula is used to determine the setting of the WV command: WV
= (Max. Apparent Vel. cm/s) * sin(beam angle) * 1.5