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Page 54
NE Speed Output
outputs the calculated values for
direction gives a positive value and speed in South and West direction gives a negative value.
3-Beam Combination Output
each of the four parameters,
Vertical
Beam. These information is useful if there are an obstruction in one of the beams but also important as quality
control to decide that there are now disturbance in one or more beams.
AutoBeam Output
outputs
Direction, North, East
and
either one of the 3-beam solutions or the 4-beam solution. If all five solutions are identical or close to identical the
sensor will always select the 4-beam solutions because this has more all beams pings and therefore better standard
deviation.
AutoBeam Speed
Type. If
these parameters. Alternative type is
in x,y coordinates and
Polar
Vertical Speed Output
outputs the measured
Enable 4-Beam Auto Replacement
Strength Output
outputs an average of signal strength from the four transducers. Alternatively 3 transducers if
4-Beam Auto Replacement
Beam Speed Output
outputs the individual speed measurements from each of the four beams
Beam Strength Output
Std Dev Speed Output
based on measurements from the four beams. Alternatively three beams if
selected.
Std Dev Beam Speed Output
Cross Difference Output
same axis, for each depth the speed in beam 1 - speed beam 3 + speed beam 2 – speed beam 4 should be close to 0.
Correlation Factor Output
is only for use in Broadband mode.
Noise Level Output
outputs the
noise level is a measurement done before the ping measurement where the sensor is only listening to the signal
received by the transducers.
indication on nearby noise sources in the water (other current meters, echo sounders etc.)
July 2019 – TD 304 OPERATING MANUAL – Doppler Current Profiler Sensor
outputs the four 3-Beam solutions, Beam 123, Beam 134, Beam 124 and Beam 234 for
SP Stdev Beam
(Single Ping Standard Deviation
SP Stdev AutoBeam
Vertical Speed
which for each parameter is the automatically selected best combination of
AutoBeam Output
is selected then
Rectangular, Polar
is the direction referenced to Magnetic North.
Vertical Speed
is selected
is selected
outputs the individual signal strength from each of the four beams.
outputs a calculated
SP Stdev Horizontal
outputs individual standard deviation for each beam.
outputs the Cross Difference which is the difference in Doppler shift from transducers on the
outputs the correlation factor for each beam. The result should be close to 0.5. This setting
Noise Peak Level
Noise Peak Level
outputs the highest signal level detected and this gives a good
North Speed
and
East Speed
(Single Ping Standard Deviation AutoBeam),
AutoBeam Speed Type
or
Rectangular +
based on the four beams. Alternatively 3 beams if
(Single Ping Standard Deviation Horizontal Speed)
Noise Average Level
and
where speed in north and east
Beam), North Beam, East Beam
Horizontal
will set the output type for
Polar. Where
Rectangular
Enable 4-Beam Auto Replacement
for each of the four transducers. The
and
Speed,
is the direction
Enable
is
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