SmartPulseHD What is it? How does it work? Why did we do it?
How will it help your measurements?
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3 Doppler Water-Profiling Techniques Pulse-Coherent (1 flavor)
Highest precision possible Requires high-level of ambiguity
resolution for practical use High percentage data capture Broadband
(multiple flavors): Precision dependant on specific pulse settings
Requires high-level of ambiguity resolution Low percentage data
capture primarily due to side-lobes in shallow water Incoherent (1
flavor) Lowest precision increases with frequency and ping rate
Highly robust no ambiguity resolution required. Highest percentage
of data capture
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What is ambiguity resolution? Fancy term for data checking.
Pulse-coherent and Broadband processing use two pulses to measure
velocity. We must check to make sure were using the correct pulses.
We must also check that we are measuring the correct lag (time)
between each. The quality of our resolver determines the maximum
velocity and depth range. We use a simultaneous collection of
frequencies and signal processing to resolve (i.e. check)
velocities measured using Pulse Coherent processing.
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PC, Broadband, IC General Water-profile Performance Thresholds
(for a given operating frequency) Velocity Depth PC IC Broadband
Using 1992 Technology Slow electronics limit IC ping rate Broadband
operation function of manual settings PC limits on practicality due
to poor data checking
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SmartPulse HD Overview An intelligent way of using
multi-frequency acoustics, pulse-coherent pings, incoherent pings,
and broadband pings to automatically provide the highest resolution
current profiling possible in the given conditions.
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RiverSurveyor SmartPulse HD Smart:Its an intelligent algorithm
that looks at water depth, water velocity and turbulence and adapts
the pulse scheme to those conditions Pulse:It uses Multi-frequency,
Pulse-Coherent, Broadband, and incoherent together automatically to
provide the highest resolution possible HD: High Definition just
like your TV, this lets customers see the clearest velocity picture
possible with cell sizes down to 2 cm
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How it works for the RiverSurveyor (Basics) We continuously
track boat motion and water depth using both bottom tracking and
the vertical beam. We also continuously monitor the velocity of the
water relative to the boat. Based upon the measured water velocity
and water depth, the optimum processing configuration is selected.
1.Always send 3-Mhz and/or 1-Mhz incoherent water-profile pings.
2.If in range, use pulse-coherent ping for water-profile. Can be
either 2-cm (3- Mhz) or 6-cm (1-Mhz). 3.A third ping-type is used
for ambiguity resolution and will use either 3-Mhz or 1-Mhz
frequency and three available ping types (Pulse-coherent,
Broadband, Incoherent).
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Advantages How can we do it? Hardware and Architecture Powerful
CPU collects and processes data simultaneously. Multi-frequency
transducers allow for simultaneous pings using 3 techniques for
water-profiling and ambiguity resolution. Best solution is selected
automatically ever second. Greatly increases Pulse-Coherent range
(depth/velocity) and resolution. YSI-ADG Engineering Talent Years
of core level development of ADCPS unmatched in industry Incredible
knowledge of physics, electronics, statistics, acoustics, etc..
Even smart enough to figure out what we need rather than what we
want.there is a difference.
Slide 9
PC, Broadband, IC General Water-profile Performance Thresholds
(for a given operating frequency) Velocity Depth PC IC Broadband
1992 Slow electronics limit IC ping rate Broadband operation
function of manual settings PC limits on practicality due to poor
data checking Velocity Depth PC IC 2010 Electronics sample IC at
the limits of physics increases precision Broadband operation best
used for checking PC data Multi-frequency and faster CPU greatly
increases PC range
Slide 10
RiverSurveyor SmartPulse HD Field Data Mean Velocity = 0.069
m/s Max # of Cells = 65 (1.6-m depth) 3-Mhz and 1 Mhz PC
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RiverSurveyor SmartPulse HD Adaptive Sampling Alafaya River
(tidal, complex patterns) Amazon River (60-m, high-velocity,
turbulent) Wekiwa River, FL (1.5-m Low-velocity)
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Broadband Incoherent SmartPulseHD
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RiverSurveyor SmartPulse HD Field Data Mean Velocity = 0.121
m/s 67 PC cells in 4.7 m depth River Lune - Lancaster 27 th
September 2010
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Mean Velocity = 0.121 m/s 51 PC cells in 1.40 m depth River
Rothay - Ambleside 27 th September 2010
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Velocity = 0.002 0.120 m/s 44 PC (HD) cells in 1.20 m depth
Velocity = 0.002 0.120 m/s 18 IC cells in 1.50 m depth Velocity =
0.770 1.080 m/s 23 IC cells in 1.80 m depth River Severn -
Llanymynech