I: ADCP - University of Hawaii · 2012-02-02 · ADCP Acquisition Systems- Overview UHDAS VmDAS...
Transcript of I: ADCP - University of Hawaii · 2012-02-02 · ADCP Acquisition Systems- Overview UHDAS VmDAS...
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NOAA Newport 2012 ADCP
Part I: ADCP ● Getting Ocean Velocity● ADCP Acquisition Systems:
UHDAS, VmDAS● What can go wrong
Part II: UHDAS
1: Outline
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NOAA Newport 2012 ADCP
Part II: UHDAS● ADCP Processing with CODAS● UHDAS: What it does● Monitoring
● At sea● On Land
● What can be changed, tested
2: Outline
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NOAA Newport 2012 ADCP
Part I: ADCP ● Getting Ocean Velocity● ADCP Acquisition Systems:
UHDAS, VmDAS● What can go wrong
3: Outline
![Page 4: I: ADCP - University of Hawaii · 2012-02-02 · ADCP Acquisition Systems- Overview UHDAS VmDAS developer Univ Hawaii TRDI style linux system windows application source open source](https://reader033.fdocuments.net/reader033/viewer/2022041715/5e4ac6d6f92f3d2f033bc7e8/html5/thumbnails/4.jpg)
(I) ADCP: Getting Ocean Velocity
ADCP :
Acoustic (it pings along beams at a frequency)
Doppler (uses frequency shift to get velocity along the beam)
Current (include many more steps to get ocean velocity)
Profiler (listen for the return in small chunks of time to create a vertical profile)
4: ADCP
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(I) ADCP: Getting Ocean Velocity
ADCP : Acoustic
5: ADCP-- Acoustic
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6: ADCP-- Doppler
ADCP :
Acoustic
Doppler
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ADCP:Acoustic Doppler Current Profiler
7: ADCP-- Profiler
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8: ADCP-- Current (1)
ADCP : Getting Ocean Currents
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9: ADCP-- Current (2)
ADCP : Getting Ocean Currents
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10: ADCP-- Current (3)
ADCPGetting OceanCurrents
Four beams● 90deg apart● 30 (or 20)deg up from vertical
● “forward beam” is #3
● usually 45deg starboard of forward
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11: ADCP-- Current (4)
ADCPGetting Ocean Currents
Four beams● 90deg apart● 30 (or 20)deg up from vertical
● “forward beam” is #3● usually 45deg starboard of forward
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12: ADCP-- Current (5)
ADCPGetting Ocean Currents
Two oppositebeams make avertical plane
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13: ADCP-- Current (6)
ADCPGetting Ocean Currents
Now we have two vertical planesat 90deg to each other
These are the basis of the horizontal and vertical velocities
Horizontal velocities will be usedTo get ocean velocities
Vertical velocities will be used forerror-checking
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14: ADCP-- Current (7)
ADCPGetting Ocean Currents
Two beams makeone vertical plan
This shows thevelocities determinedby the Doppler shift;
“beam velocities”
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15: ADCP-- Current (8)
ADCP: Getting Ocean Currents
Interpret the two beam velocitiesone horizontal and one verticalvelocity
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16: ADCP-- Current (9)
ADCP: Getting Ocean Currents
Now we see the horizontal andvertical velocities on the two planes
Use the horizontal velocities for determining ocean velocities requires more steps.
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17: ADCP-- Current (10)
ADCP: Getting Ocean Currents
This is a top-down view of the measuredhorizontal velocity ininstrument coordinates(from the two planesmade by the beams)
(determining oceanvelocities requiresmore steps)
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18: ADCP-- Current (11)
ADCP: Getting Ocean Currents
This is a top-downview of the measured horizontal velocityin ship coordinates.
The instrumentcoordinates valuesare rotated by thetransducer angle.
(determining oceanvelocities requiresmore steps)
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19: ADCP-- Current (12)
ADCP: Getting Ocean Currents
This is a top-downview of the measured horizontal velocityin earth coordinates.
The instrumentcoordinates valuesare rotated by theship's heading.
(determining oceanvelocities requiresmore steps)
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20: ADCP-- Current (13)
ADCP: Getting Ocean Currents
Summary of steps:
Doppler to beam (not shown)
below here: horizontal+vertical
● beam to instrument ● instrument to ship● ship to earth
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21: ADCP-- Current (14)
ADCP: Getting Ocean Currents
Earth coordinates + GPSgives ship speed
add ship speed to measured velocityto getocean velocity
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22: ADCP-- Current (15)
ADCP: Getting Ocean Currents
Complete summary:
beam velocities
+
transducer orientation + + heading
+
gps
ocean velocities
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NOAA Newport 2012 ADCP
Part I: ADCP ● Getting Ocean Velocity● ADCP Acquisition Systems:
UHDAS, VmDAS● What can go wrong
23: Outline
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ADCP Acquisition systems
● Basic requirements:● Control ADCP settings● Acquire ADCP data● Acquire ancillary data
– Position– Attitude (heading)
● Timestamp all
● Processing● Monitoring
Core
Extra
24: Acquisition Systems (1)
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ADCP Acquisition systems
● Basic requirements● Processing
● Coordinate transformation● Editing● Averaging● Graphical Displays
● Monitoring
25: Acquisition Systems (2)
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ADCP Acquisition systems
● Basic requirements● Processing● Monitoring
● Computer system● Data acquisition● Processing● Access to data
26: Acquisition Systems (3)
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ADCP Acquisition systems
● Basic requirements● Overview● Serial setup● Data logging
● Processing● Monitoring
27: Acquisition Systems – Basic Requirements (1)
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ADCP Acquisition Systems- Overview
UHDAS VmDAS
developer Univ Hawaii TRDIstyle linux system windows applicationsource open source executablepurpose seagoing all-purpose oceanographers goals maximize off-the-shelf usefulness at sea long-term value for researchevolution continuous incrementalsetup complex confusing
28: Acquisition Systems – Basic requirements (2)
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Acquisition: Serial Setup
UHDAS VmDASADCPs multiple one (per instance)feeds any number 3 (older version=2)messages many types fewer types can add more subsample feed record all choose messages record all
gui controls instrument settings everythingoperation simple simple/confusingprotected serial nothing protected Processing
29: Acquisition Systems – Basic requirements (3)
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Acquisition: Data Logging
UHDAS VmDAS
data logging separate one big program processes time tagging buffered unbuffered tag every line tag ensembledata formats multiple TRDI ADCPdata directory heirarchical flattime range match per file match for one logging periodfilenames sort always one logging period ( time=ascii) metadata stored with data text file elsewhere
30: Acquisition Systems – Basic requirements (4)
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ADCP Acquisition systems
● Basic requirements● Overview● Serial setup● Data logging
● Processing● Processing components● Accessing data products
● Monitoring
31: Acquisition Systems – Processing (1)
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Processing UHDAS VmDASediting CODAS minimalheading reliable primary secondary corrected to replaced by heading accurate fallbackpings interleaved firstconfigure no yes plots?? plots oceanographic: - profiles (E,N) profile (speed, dir) - vector (+topo) vector - contour WinADCP? - bridge (mariner)
32: Acquisition Systems – Processing (2)
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Accessing Data Products UHDAS VmDAS
access plots ship's web console only consoledata formats TRDI TRDI Matlab netCDFaccess data ship's web acquisition PC windows share windows share NFSdocumentation ship's web acquisition PC www wwwspeedlog out NB150 only yes
33: Acquisition Systems – Accessing Data
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ADCP Acquisition systems
● Basic requirements● Overview● Serial setup● Data logging
● Processing● Processing components● Accessing data products
● Monitoring
34: Acquisition Systems – Monitoring (1)
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Monitoring monitor UHDAS VmDAS
computer daily report ?serial daily_report LOG and console messages configure tablesADCP beam plots configure plotsProcessing daily_report configure plots plots calibration no ping rate ? bottom track noremotely email to anyone no
35: Acquisition Systems – Monitoring (2)
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NOAA Newport 2012 ADCP
Part I: ADCP ● Getting Ocean Velocity● ADCP Acquisition Systems:
UHDAS, VmDAS● What can go wrong
– Perspective: systems– Perspective: data flow– Perspective: symptoms in ocean current– Perspective: oversight/monitoring
36: Outline
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ADCP: what can go wrong
● ADCP systems (components)– Computer– ADCP– Ancillary: GPS, Heading
● Data flow (where does the problem occur)● Manifestation in ocean velocities – examples
– Cross-track error (transducer angle)– Along-track error (scale factor)– Transition/maneuvering errors (lags in time or space)
● Monitoring– Data loss/compromise (4 recent examples)
37: Things go wrong
Viewed from the Perspective of:
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ADCP: what can go wrong
● ADCP systems (components)– Computer– ADCP– Ancillary: GPS, Heading
● Data flow (where does the problem occur)● Manifestation in ocean velocities – examples
– Cross-track error (transducer angle)– Along-track error (scale factor)– Transition/maneuvering errors (lags in time or space)
● Monitoring– Data loss/compromise (4 recent examples)
38: Things go wrong
Viewed from the Perspective of:
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What can go wrong: system=computer
● PC clock is erratic● PC clock is set to local time● Poor quality serial feed
● Too many messages● Low baud rate● Multiple unbuffered devices
39: Things go wrong: computer
Partial loss, Garbled messages
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Bad Serial Feeds
VmDAS is vulnerable to bad serial feeds
Demonstration follows...
40: Things go wrong: bad serial
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41: Things go wrong: bad serial
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42: Things go wrong: bad serial
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43: Things go wrong: bad serial
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44: Things go wrong: bad serial
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45: Things go wrong: bad serial
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46: Things go wrong: bad serial
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47: Things go wrong: bad serial
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What can go wrong: system=ADCP
● ADCP loss or degradation● Loss of range (loud while underway, weak beam)● Loss of one beam (not good)● Loss of multiple beams (repair/replace)● Acoustic interference (another pinger)● Ice● Bubbles● Electrical noise
48: Things go wrong - ADCP
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What can go wrong: system=ancillary
● Heading● Heading device fails● Inaccurate heading device (old mechanical gyro)
● Position● Position device fails; gappy
● Any: serial feed problems● Cable falls out● Instrument fails
49: Things go wrong - ancillary
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ADCP: what can go wrong
● ADCP systems (components)– Computer– ADCP– Ancillary: GPS, Heading
● Data flow (where does the problem occur)● Manifestation in ocean velocities – examples
– Cross-track error (transducer angle)– Along-track error (scale factor)– Transition/maneuvering errors (lags in time or space)
● Monitoring– Data loss/compromise (4 recent examples)
50: Things go wrong
Viewed from the Perspective of:
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ADCP: data loss, degradation(1) degraded range and coverage
BubblesElectric NoiseAcoustic noiseLost or weak beamThick windowRingingIce
Solution: Improve the installation
beam velocities
GPS
ocean velocities
+
+
transducer orientation +
heading
51: Things go wrong (system)
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ADCP: data loss, degradation(2) remaining data compromised
BubblesElectronic noiseAcoustic noiseLost or weak beamThick windowRingingIce
Solution: Edit out bad data Review what remains
beam velocities
GPS
ocean velocities
+
+
transducer orientation +
heading
52: Things go wrong (system)
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Transducer misalignment(1) angle off by <10deg
Diagnostic: Cross-track error
beam velocities
GPS
ocean velocities
+
+
transducer orientation +
heading
1deg error in heading
10cm/s error in ocean velocity
53: Things go wrong (system)
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Transducer misalignment(2) angle off by >90deg (*)
Diagnostic: beam velocities corrupted (wrap)
beam velocities
GPS
ocean velocities
+
+
transducer orientation +
heading
Ocean Surveyor acquires datausing EA in the calculation of
BEAM VELOCITIES. Gross errorcould irrevocably ruin the data
54: Things go wrong (system) (*) actual value varies with ship
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Failure of ancillary (heading, gps)
Solution: Record multiple sources Switch to 2nd source Reprocess with 1st
beam velocities
GPS
ocean velocities
+
+
transducer orientation +
heading
55: Things go wrong (system)
Instrument failureCommunications failure
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Intermittent loss or corruption ofancillary data
Solution: Record multiple sources Switch to 2nd source Reprocess with 1st
beam velocities
GPS
ocean velocities
+
+
transducer orientation +
heading
56: Things go wrong (system)
poor serial feeds
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ADCP: what can go wrong
● ADCP systems (components)– Computer– ADCP– Ancillary: GPS, Heading
● Data flow (where does the problem occur)● Manifestation in ocean velocities – examples
– Cross-track error (transducer angle)– Along-track error (scale factor)– Transition/maneuvering errors (lags in time or space)
● Monitoring– Data loss/compromise (4 recent examples)
57: Things go wrong
Viewed from the Perspective of:
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What can go wrong: in the ocean velocities
(1) Cross-track error:– recovery requires accurate heading
(2) Along-track error:– may indicate a serious problem– recovery may be possible, incomplete,
ambiguous
(3) Transition/maneuvering error– Lag or offset in time or space
58: Things go wrong (symptom)
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What can go wrong: in the ocean velocities
(1) Cross-track error:– recovery requires accurate heading
(2) Along-track error:– may indicate a serious problem– recovery may be possible, incomplete,
ambiguous
(3) Transition/maneuvering error– Lag or offset in time or space
59: Things go wrong (symptom)
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60: Things go wrong (angle, cartoon)
Symptom = Cross-Track ErrorCause = incorrect angle applied
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61: Things go wrong (angle, source)
Symptom = Cross-Track ErrorCause = incorrect angle applied
Angle applied comes from ● Transducer angle (beam “3” clockwise from bow)● Heading of ship● If UHDAS,
● Reliable heading for each ping (eg gyro)● Heading correction for each averaging period● Calculated relative to devices such as Ashtech,
POSMV, Seapath, Mahrs, Phins
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62: Things go wrong (angle, constant)
Symptom = Cross-Track ErrorCause = incorrect angle applied
Angle applied comes from ● Transducer angle (beam “3” clockwise from bow)
This is a constant value for the whole cruise
Examples of error in transducer angle follow...
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Calibration: angle error -3.6deg
63: Things go wrong (angle, constant error)
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Calibration: angle error -1.6
64: Things go wrong (angle, constant error)
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Calibration: angle error 0.4
65: Things go wrong (angle, constant error)
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66: Things go wrong (angle, variable)
Symptom = Cross-Track ErrorCause = incorrect angle applied
Angle applied comes from
Heading, which may be in error by● A constant offset● A time-dependent offset
Example follows ...
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Phins-Gyro difference varies with time
0.5 deg
-0.5 deg0.0 deg
Changes in ship's heading affect heading error67: Things go wrong (angle, variable)
0 deg
360 deg
Heading
Heading error
180 deg
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0.5 deg
-0.5 deg0.0 deg
Changes in ship's heading affect heading error68: Things go wrong (angle, variable)
Heading
Heading error
Effect of Time-Dependent Heading Erroron Ocean Velocties
1 degree error in heading means: – 0.1m/s error in ocean velocity – in the cross-track direction
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Is this a heading error?
69: Things go wrong (angle, variable, trick question)
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Contour plot:
Is this cross-tracksignal(stripes in N/S ocean velocity)due to a heading error?
70: Things go wrong (angle, variable, trick question)
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Answer
Actually, it's really the ocean, butwe can't tell without knowing
the quality of the accurate heading device.
71: Things go wrong (angle, variable, trick answer)
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What can go wrong in the ocean velococities
(1) Cross-track error:– recovery requires accurate heading
(2) Along-track error:– may indicate a serious problem– recovery may be possible, incomplete,
ambiguous
(3) Transition/maneuvering error– Lag or offset in time or space
72: Things go wrong (symptom)
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Examples of along-track error
● Acoustic interference● Underway bias (bad weather)● Scale factor (NB150 soundspeed correction)
73: Things go wrong (along-track error)
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74: Things go wrong (scale factor, cartoon)
Along-track Error
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Examples of along-track error
● Acoustic interference● Underway bias (bad weather)● Scale factor (NB150 soundspeed correction)
75: Things go wrong (along-track error)
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Acoustic Interference: single ping
76: Errors
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Acoustic Inference: averaged
77: Errors
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78: Errors
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Examples of along-track error
● Acoustic interference● Underway bias (bad weather)● Scale factor (NB150 soundspeed correction)
79: Things go wrong (along-track error)
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single-ping editing:underway bias
80: Errors
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Averaged (unedited) data: Acoustic interference and underway bias (bubbles)
81: Errors
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82: Errors
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Examples of along-track error
● Acoustic interference● Underway bias (bad weather)● Scale factor (NB150 soundspeed correction)
83: Things go wrong (along-track error)
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scale factor: alongtrack bias
84: Things go wrong (scale factor, before)
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After scale factor applied
85: Things go wrong (scale factor, after)
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What can go wrong in the data product
(1) Cross-track error:– recovery requires accurate heading
(2) Along-track error:– may indicate a serious problem– recovery may be possible, incomplete,
ambiguous
(3) Transition/maneuvering error– Lag or offset in time or space
86: Things go wrong (symptom)
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Example: offset between ADCP and GPS creates an artifact during maneuvering
87: Things go wrong (symptom)
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Transducer offset from GPS--error occurs: transition between on-station and underway
heading speed
...using actuallocation
...using shifted GPSlocation
difference
88: Things go wrong (symptom)
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Things go wrong: Oversight● Problem Exists, but noone notices● Solution: for previous data
● Rely on reprocessing● Might require new software● Might be able to fix...● Might NOT be able to fix
● Solution: for future cruises● Fix it● Monitor the system
89: Things go wrong : Oversight
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Things go wrong: Oversight● (1) Bad Processing settings:
– Sette: acquiring heading, not using it
● (2) Serial Snafu
– Gordon Gunter: intermittently awful serial data
● (3) Bad setup
– (a) Walton Smith: POSMV ● the ONLY heading source● Poor quality
– (b) MacArthur2: not acquiring heading at all
● (4) Bad luck – several: 3 beams
90: Things go wrong : Oversight
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Things go wrong: Oversight
● (1) Bad Processing settings:– Sette: acquiring heading, not using it
91: Things go wrong : Oversight
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Acquiring headings, but not using...
CFG
LDR
CFG
NAV
Internal sensor only
N2Rfile
92: Things go wrong : Oversight
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Things go wrong: Oversight example
● Solution (1):● Reprocess with VmDAS; use heading (10 hours)● Run through CODAS matlab processing (2 hours)
● Solution (2):● Write additional CODAS software (many hours)● Stage VmDAS in UHDAS format (5 min)● Process as UHDAS data; use heading (15 min)
● For future cruises:● fix it
Sette: acquiring heading, but not using it
93: Things go wrong : Oversight
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94: Things go wrong : Oversight
Choose existing heading source for future cruises
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Things go wrong: Oversight example
● (2) Serial Snafu
– Gordon Gunter: intermittently awful serial data
95: Things go wrong : Oversight
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Things go wrong: Oversight example
Number of charactersper line
good
bad
96: Things go wrong : Oversight
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Things go wrong: Oversight example
● Solution for future cruises:● Fix it: direct serial feeds from GPS and gyro
● Solution: past cruises● Expert: use other data to patch in position, heading● MIGHT NOT WORK● Resulting Data quality: unknown
– NOT TESTED; expert level processing; timeconsuming
(2) Gordon Gunter: intermittantly awful serial data
97: Things go wrong : Oversight
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Things go wrong: Oversight example
(3) Bad setup– (a) Walton Smith: POSMV
● the ONLY heading source● Poor quality
– (b) MacArthur2: not acquiring heading at all
98: Things go wrong : Oversight
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Things go wrong: oversight
99: Things go wrong : Oversight
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Things go wrong: oversight example
● Solution for future cruises:● Log gyro as well
● Solution for past cruises:● Expert: use other data to patch in position, heading● MIGHT NOT WORK● Resulting Data quality: unknown
– NOT TESTED; expert level processing; timeconsuming
(3) POSMV is unhealthy and is the only heading source
100: Things go wrong : Oversight
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Things go wrong: oversight example
(3) Bad setup– (a) Walton Smith: POSMV
● the ONLY heading source● Poor quality
– (b) MacArthur2: not acquiring heading at all
101: Things go wrong : Oversight
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Heading not used: Is it being logged?
LDR: internal sensor only
NAV: From serial logging
102: Things go wrong : Oversight
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Heading is not being logged at all
(1) Only N1R files
(2) No heading field here:
(3) VmDAS “Transform” Tab – nothing selected!
103: Things go wrong : Oversight
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Things go wrong: oversight example
● Solution for future cruises:● Fix it: Acquire Heading
● Solution for past cruises:● Expert: use other data to patch in position, heading● MIGHT NOT WORK● Resulting Data quality: unknown
– NOT TESTED; expert level processing; timeconsuming
Not logging heading at all
104: Things go wrong : Oversight
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Things go wrong: oversight example
● Problem: Bad luck , unmonitored● Various ships: 3 beams (for many months)
105: Things go wrong : Oversight
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106: Things go wrong : Oversight
Beam 1
Things go wrong: only 3 beams work
Beam 2 Beam 3 Beam 4
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Things go wrong: only 3 beams
● Solution for past cruises:● Process data using 3-beam solutions● Data quality reduced
● Solution for future cruises:● Replace/repair instrument
107: Things go wrong : Oversight
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NOAA Newport 2012 ADCP
Part II: UHDAS● ADCP Processing with CODAS● UHDAS: What it does● Monitoring
● At sea● On Land
● What can be changed, tested
108: Outline
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NOAA Newport 2012 ADCP
Part II: UHDAS● ADCP Processing with CODAS● UHDAS: What it does● Monitoring
● At sea● On Land
● What can be changed, tested
109: Outline
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CODAS Processing Overview
CODAS: Common Ocean Data Access System● Portable● Self-descriptive● aggregated files (vs/ netCDF which is one file)● designed for ADCP data
“CODAS Processing” → produce ocean velocities● tools to access and modify CODAS files
110: CODAS
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CODAS Processing Steps● read ADCP + ancillary data● [transform, edit single-pings, average]● load into CODAS database● nudge positions to get smooth reference layer● apply heading corrections (calculated from
difference between gyro and accurate heading)● determine calibration values (angle, scale factor),
- apply angle and scale factor ● edit out bad profiles of averaged data
111: CODAS
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112: CODAS
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113: CODAS
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CODAS Processing Supports...
114: CODAS
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At Sea
At Home
115: CODAS
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NOAA Newport 2012 ADCP
Part II: UHDAS● ADCP Processing with CODAS● UHDAS: What it does● Monitoring
● At sea● On Land
● What can be changed, tested
116: Outline
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UHDAS: what it does
● Data acquisition and processing● Data access (for scientist at sea)● Monitoring tools
● at sea● from shore
117: UHDAS: what it does
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UHDAS: what it does:
Data acquisition …
● logs and timestamps data
● parses NMEA data (Matlab, Python)
.... and processing
● transforms (ADCP), grids (ancillary), edits (pings)
● averages, loads (into CODAS database)
● all CODAS processing
118: UHDAS: what it does
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UHDAS: What it does:
Data Access...● web site on ship with
● 5-minute profile (updated 5min)● 3-day vector and contour plot (updated 30min)● matlab files via web (used in 3-day plots)
● full-resolution processed (5min averages) via ● samba (windows share), NFS● Files in Matlab, NetCDF, or CODAS (+access tools )
119: UHDAS: what it does
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UHDAS: What it does
Monitoring...● at sea:
● processing (web plots)● health of accurate heading device (web plots)● data acquisition (UHDAS tool)
● from shore:● sends daily email with attachment● diagnostic files● data snippet● shore-based figures generated from snippet
120: UHDAS: what it does
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UHDAS cruise directory structure
121: Where things are written
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Cruise Sequence (for operator)
● Start UHDAS gui● Start cruise● Start logging; directory contents of..
● raw● rbin● gbin● proc
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UHDAS gui tool
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NOAA Newport 2012 ADCP
Part II: UHDAS● ADCP Processing with CODAS● UHDAS: What it does● Monitoring
● At sea● On Land
● What can be changed, tested
124: Outline
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Monitoring: At Sea
There are three categories of monitoring:
(1) CODAS Processing
(2) health of components (Ashtech)
(3) data acquisition
Example at-sea web site
125: Monitoring (at sea)
Mostrefined
Leastrefined
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Monitoring: At Sea
There are three categories of monitoring:
(1) CODAS Processing
(2) health of components (Ashtech)
(3) data acquisition
126: Monitoring (at sea)
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Monitoring At Sea: UHDAS web site
127: Monitoring (at sea)
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128: Monitoring (at sea)
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129: Monitoring (at sea)
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130: Monitoring (at sea)
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131: Monitoring (at sea)
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132: Monitoring (at sea)
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Monitoring: At Sea
There are three categories of monitoring:
(1) CODAS Processing
(2) health of components (Ashtech)
(3) data acquisition
133: Monitoring (at sea)
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Attitude Health
● Examples of ● Ashtech● POSMV● Phins
● Statistics generated for all 3● Example of POSMV in trouble
134: Monitoring (at sea)
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Ashtech
135: Monitoring (at sea)
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POSMV
136: Monitoring (at sea)
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Phins
137: Monitoring (at sea)
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Statistics generatedin daily email for three cases
138: Monitoring (at sea)
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POSMV in trouble
139: Monitoring (at sea)
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Monitoring: At Sea
There are three categories of monitoring:
(1) CODAS Processing
(2) health of components (Ashtech)
(3) data acquisition
140: Monitoring (at sea)
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Monitoring At Sea: data Acquisition
141: Monitoring (at sea)
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UHDAS: Monitoring from shore
Link to on-shore monitoring: UHDAS ships● text email● figures● diagnostic files
142: Monitoring (from shore)
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UHDAS: http://currents.soest.hawaii.edu/uhdas_fromships.html
143: Monitoring (from shore)
Actual link
screenshot
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Monitoring: From Shore
● from the text email:● CODAS Processing● health of heading device (eg. Ashtech)● PC clock● Bottom track (on/off), ping rate (triggered)
● from the diagnostic files:● data acquisition● processing● troubleshooting
144: Monitoring (from shore)
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Monitoring: From Shore
● from the text email:● CODAS Processing● health of heading device (eg. Ashtech)● PC clock● Bottom track (on/off), ping rate (triggered)
Description follows...
145: Monitoring (from shore)
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146: Monitoring (from shore)
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147: Monitoring (from shore)
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148: Monitoring (from shore)
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149: Monitoring (from shore)
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150: Monitoring (from shore)
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151: Monitoring (from shore)
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152: Monitoring (from shore)
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153: Monitoring (from shore)
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Monitoring: From Shore
● from the diagnostic files:
“tails.txt”● data acquisition● processing● troubleshooting
“cals.txt”● calibration
154: Monitoring (from shore)
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Diagnostics reminder:UHDAS cruise directory structure
155: Monitoring (from shore)
File tails.txt shows recent contents of raw, rbin, gbin
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UHDAS diagnostic file: tails.txt
● last 12 lines of each NMEA (or log) file● last 12 raw files (each kind)● last 12 rbin files (each kind)● last 12 gbin files (each kind)
156: Monitoring (from shore)
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UHDAS diagnostic file:cals.txt
keep an eye on calibration
157: Monitoring (from shore)
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NOAA Newport 2012 ADCP
Part II: UHDAS● ADCP Processing with CODAS● UHDAS: What it does● Monitoring
● At sea● On Land
● What can be changed, tested
158: Outline
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UHDAS: what can be changed(not much)
with the UHDAS tool:● bb, nb mode (OS75, OS150)● bottom tracking on/off● bin size (and blank)
if required (carefully edit sensor_cfg.py)● serial port, baud rate
159: Configuration
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UHDAS: what they'll ask for
“It's up to you but I don't recommend it”
● smaller bins than the default● bottom tracking on
● Does not solve anything● Most useful for troubleshooting
160: Configuration
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UHDAS: what they'll ask for
“I think the answer is 'no' but ask Jules”
● more rapid updating of the database● finer grain than 5min averages
The answer is 'no', in order to preserve
the reliability of the UHDAS installation
161: Configuration
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Configuration Files (expert)
● proc_cfg.py
– transducer angle
– serial inputs used for transformations
● uhdas_cfg.py
– averaging interval
– timers (5min, 30min)
– bin range for bridge plots and vector plot
● sensor_cfg.py
– ports
– baud rates
– messages
162: Configuration
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163: Configuration
Block diagram ofsensor_cfg.py
This is a python program.Python is sensitive to Case Indentation Punctuation
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164: Configuration
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165: Configuration
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UHDAS/CODAS NOAA Presentation: Links to the documentation
Part I: ADCP ● Getting Ocean Velocity● ADCP Acquisition Systems:
– VmDAS (TRDI),UHDAS● What can go wrong
Part II: UHDAS● ADCP Processing with CODAS● What it does● Monitoring (at sea, from shore)● What can be changed, tested
166: Outline