Calibration settings for Simrad SM2000 and SM20 data
This page describes the settings, necessary to an Echoview calculation, on the Calibration page of the Variable Properties dialog box for acoustic variables derived from SM2000 and SM20 data files.
We recommend you assess the suitability of the settings available on the Calibration pages for each acoustic variable. Quantitative calculation/analysis requires calibrated data which is achieved using correct calibration setting values (rather than default values). An ECS file enables you to modify calibration settings for variables in a fileset.
Changes in calibration settings used for range calculations may shift ping data in the depth dimension but will not automatically adjust the position of regions and lines. You should review any existing regions and lines to ensure they are still valid. For more information refer to Range calculation effects on regions and lines.
Note: Data file values that have been used since the data was loaded or the ECS file was added, saved or removed are displayed in black text. Default values that have been used are displayed in orange text. Data file or ECS values that have been read but not used are displayed in grey text. Read About calibration settings for further information.
Simrad Mesotech SM2000 FR and Kongsberg Mesotech SM20
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Y |
Setting is used in calculating data point values. |
| Setting is not used in calculating data point values but may be used for other purposes, see Additional uses of Calibration settings | |
| Setting is not available for this variable. |
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Calibration setting |
Details | ||||||||
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SM2000 raw data and SM20 data
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SM2000 beamformed data
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| magnitude raw beam pings | phase raw beam pings | magnitude beamformed raw beam pings | phase beamformed raw beam pings | Sv beamformed raw beam pings | Sv beamformed pings | magnitude complex beamformed pings | phase complex beamformed pings | magnitude beamformed pings | |
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Y |
Y |
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Y |
Y |
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Frequency (kHz) |
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Y |
Y |
Y |
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SM2000Sector+ (degrees) |
Y |
Y |
Y |
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SoundSpeed+ (m/s) |
Y |
Y |
Y |
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SM2000HeadType* (degrees) |
Y |
Y |
Y |
Y |
Y |
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SM2000Radius* (m) |
Y |
Y |
Y |
Y |
Y |
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SM2000Spacing* (degrees) |
Y |
Y |
Y |
Y |
Y |
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- A transducer can be selected in order to apply transducer geometry to the echogram.
- + SM2000BeamsToForm, SM2000Sector and SoundSpeed are used by the beamforming algorithm.
- * SM2000HeadType, SM2000Radius, SM2000Spacing can be used to specify the SM2000 Head used for logging. SM2000Spacing is also known as the SM2000 Interelement spacing (degrees). Refer to Typical Head values or specify the values used with an ECS file. If the head properties were changed during logging, the data files with different settings must be entered in separate filesets.
- SM2000 data may have raw variables that are paired, this means the pair share calibration settings. As a result calibration changes to one variable will affect the other variable. Paired variables include:
- Magnitude raw beam pings variables and phase raw beam pings variables in the same fileset.
- Magnitude beamformed raw beam pings variables and phase beamformed raw beam pings variables in the same fileset.
- Magnitude beamformed pings variables and phase beamformed pings variables in the same fileset.
- A transducer can be selected in order to apply transducer geometry to the echogram. The 3dB beam angle setting is not used. Schools variables are not corrected for beam width. There is no correction for beam shape in 3D school detection.
Typical Head values
|
Head type
(degrees) |
Head radius
(meters) |
Head spacing
(degrees) |
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180
|
0.1100
|
1.9620
|
|
120
|
0.2000
|
1.1160
|
|
90
|
0.3874
|
1.2000
|
|
60
|
0.4293
|
0.8496
|
See also
About transducer geometry
Simrad data files
Raw variables from Simrad SM2000 raw data files
Raw variables from Simrad SM2000 beamformed data files
Raw variables from Kongsberg SM20 data files
Kongsberg SM20 data files
About calibration settings
Entering calibration settings