Calibration names used by transducer specific raw variables

Calibration names are used in Calibration sources and ECS files. Calibration values used by Echoview are displayed on the Calibration page of the Variable Properties dialog box or Details dialog box. Use an ECS file to modify calibration values. The following are specific to particular data formats.

Notes:

  • A default value is used when a setting's value is outside the valid range.
  • 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.

Used by raw acoustic variables

See also:

Calibration settings for data formats
Common calibration names
Calibration Information dialog box

Calibration setting name

ICES CRR No. 326

Table of Terms, symbols, and units
Equivalent name

Help file terminology

Default value

Units

MinorAxisAngleOffset

Transducer beamwidth offset (β0, °) for minor angles in the β plane.

Simrad defines Angle Offset as the offset angle from the acoustical axis. The value is estimated during calibration. If no calibration takes place, the value 0 is used. There may be an Angle Offset for the Major-axis and/or the Minor-axis angles.

0

degrees

MinorAxisAngleSensitivity

Transducer angle sensitivity (Electrical ° or geometric °) for minor angles in the β plane.

Simrad defines Angle Sensitivity as a parameter that is used in the conversion of the raw angle samples into mechanical degrees for fore-and-aft and athwartship directions. It represents the ratio of electrical degrees to mechanical degrees for the current transducer. This ratio is not used with single beam transducers, and the value is set to 0.

There may be an Angle Sensitivity for the Major-axis and/or the Minor-axis angles.

See also: Beam angles

Used by:

  • Ek500 Sv and TS from Power (W telegrams) and B telegrams logged with Ex500
  • Ek500 Sample Sv and TS variables (V and P telegrams) logged with Ex60
  • Ek60 angular position raw variables
  • ME70 angular position raw variables

21.9

ApplyCalibrationCorrection

 

(Apply Simrad) Calibration correction

Default value is ApplyCalibrationCorrection = false.

Used with:

false

TransducerGain

 

The recorded transducer-specific gain that is used in Simrad Ek60 Power to Sv and TS algorithms.

Instrument Equivalent term from the data file
Simrad Ek60

(Sv or TS) Transducer gain

Used in the Ex60 Power to Sv and TS algorithm. Note that Sa is a separate correction factor in this equation.

This setting corresponds to the Gain setting on the Ex60's Advanced Transceiver dialog box and is defined in the Simrad EK60 Instruction Manual as "The transducer gain presented by calculating the directivity multiplied by the transducer's efficiency."

See also: Transducer gain

Simrad ME70 (Sv or TS) Transducer gain, as for Simrad Ek60.

Note: A deprecated alias is Ek60TransducerGain.

26.5

dB

MajorAxisAngleOffset

Transducer beamwidth offset (α0, °) for major angles in the α plane.

Refer to MinorAxisAngleOffset.

0

degrees

MajorAxisAngleSensitivity

Transducer angle sensitivity (Electrical ° or geometric °) for major angles in the α plane.

Refer to MinorAxisAngleSensitivity.

21.9

SimradBandwidth

 

Bandwidth

As pertaining to Ex500 echosounders and used in the Ek500 Power to Sv or TS calculation.

Unknown

Unknown
Narrow
Wide
Auto

EcholistenerEchosounderConstant

 

Used explicitly by EchoListener data files.

300

None

SaCorrectionFactor

 

Sa correction

The Sa correction factor is determined during the calibration process of Ex60 echosounders. The value represents the correction required to the Sv constant to harmonize the TS and Sa (NASC) measurements. Sa corrections are only determined during a calibration, otherwise they are zero.

A deprecated alias is EK60SaCorrection.

0

dB

SamplingFrequency

Acoustic frequency (Hertz, Hz)

Sampling frequency

The Sampling frequency, together with the SoundSpeed and TransmittedPulseDuration, is used to calculate the sample thickness.

Kilohertz

SimradSampleResolution

 

Sample resolution

10

Centimeters

SimradStartSampleRange

 

Start sample range

0

Meters

TvgRangeCoefficient

 

TVG range coefficient

20

None

Used by raw variables that can have logging settings

See also:

Calibration settings for data formats
Common calibration names
Calibration Information dialog box

Calibration setting name

ICES CRR No. 326

Table of Terms, symbols, and units
Equivalent name

Help file terminology

Default value

Units

AbsorptionCoefficientLogging

 

Logging value for the Absorption coefficient.

0.01

dB per meter

SoundSpeedLogging

 

Logging value for the Sound speed.

1500

Meters per second

TransmittedPower

Transmit acoustic power (W)

Transmitted power

2000

Watts

TransmittedPowerLogging

 

Logging value for the Transmitted power.

2000

Watts

TwoWayBeamAngleLogging

 

Logging value for the Two-way beam angle.

-20.6

dB re 1 Steradians

Ek5SvGain

 

Ek5 Sv gain

Used in EK500 Power to Sv and TS - to calculate the transducer peak gain.

26.5

dB

Ek5TSGain

 

Ek5 TS gain

Used in EK500 Power to Sv and TS - to calculate the transducer peak gain.

26.5

dB

Ek5SvGainLogging

 

Logging value for the Ek5SvGain.

26.5

dB

Ek5TSGainLogging

 

Logging value for the Ek5TSGain.

26.5

dB

PulseDurationLogging

 

Logging value for the pulse duration.

A deprecated alias is TransmittedPulseLengthLogging.

1

Milliseconds

WavelengthLogging

 

Logging value for the Wavelength.

0.0394737

Meters

Wavelength

 

Wavelength

0.0394737

Meters

SimradPulseLength

 

Simrad Pulse length

Pertaining to the Ex500 echosounder and used in the Ek500 Power to Sv or TS calculation.

Unknown

Unknown
Long
Medium
Short

SimradDraftLogging

 

Logging value for the Simrad Draft for Simrad Sv and TS variables based on Q telegrams and single target variables based on E telegrams and only when these variables include a logged draft.

We strongly recommend logging data with transducer depth set to 0 and using Echoview's transducer geometry to model the draft.

Note: There may be slight differences in single target or fish track exported analyses when comparing the analyses pre and post Echoview 5.

0

Meters

ASL Environmental Sciences data format

See also:

Calibration settings of ASL Environmental Sciences data
Common calibration names
AZFP Sv and TS
Calibration Information dialog box

Calibration setting name

ICES CRR No. 326

Table of Terms, symbols, and units
Equivalent name

Help file terminology

Default value

Units

AzfpDetectionSlope

 

Value for a read from an associated AZFP .XML or .cfg file if it is present in the data folder.

0.0227

Volt/dB

AzfpEchoLevelMax

 

Value for ELmax read from an associated AZFP .XML or .cfg file if it is present in the data folder.

128.3

dB

AzfpTransmitVoltage

  Value for VTX read from an associated AZFP .XML or .cfg file if it is present in the data folder.

91.9

AzfpTransmitVoltageResponse

 

Value for TVR read from an associated AZFP .XML or .cfg file if it is present in the data folder.

172.3

dB

CalibrationOffsetSv

 

A setting for an AZFP Sv calibration offset constant.

0

dB

CalibrationOffsetTs

 

A setting for an AZFP TS calibration offset constant.

0

dB

SoundSpeed

Water sound speed (ms-1)

SoundSpeed may be read from an associated AZFP .XML or .cfg file if it is present in the data folder.

1500

meters/second

TwoWayBeamAngle

Equivalent two-way beam angle

(steradian (sr) or dB re 1 sr)  

TwoWayBeamAngle may be read from an associated AZFP .XML or .cfg file if it is present in the data folder.

-20.600000

dB re 1sr

BioSonics data format

See also:

Calibration settings for BioSonics data
Common calibration names
Calibration Information dialog box

Calibration setting name

ICES CRR No. 326

Table of Terms, symbols, and units
Equivalent name

Help file terminology

Default value

Units

Dt4PowerSetting

 

BioSonics power setting

Note: Post-Echoview 3.00 the calibration setting Dt4PowerSetting is used and the Calibration offset setting is set to zero. Pre-Echoview 3.00 the Calibration offset setting was used to represent the BioSonics PS (Power setting) value - Echoview was unable to read the BioSonics PS at that time.

0

dB

CalibrationOffsetSv

 

A setting for the BioSonics Sv transducer constant that can be used in the BioSonics Sv equation.

0

dB

CalibrationOffsetTs

 

A setting for the BioSonics TS transducer constant that can be used in the BioSonics TS equation.

0

dB

ReceiveSensitivity

 

DT4 Receive sensitivity (RS) read from the data file and used in BioSonics DT4 Sv and TS equations.

dB

SourceLevel

 

DT4 Source level (SL) read from the data file and used in BioSonics DT4 Sv and TS equations.

dB

Echoview Data File Format

Calibration setting name

ICES CRR No. 326

Table of Terms, symbols, and units
Equivalent name

Help file terminology

Default value

Units

CalibrationOffsetSv

 

An offset value used in the Echoview Data File Format Power to Sv equation.

0

dB

CalibrationOffsetTs

 

An offset used in the Echoview Data File Format Power to Sv equation.

0

dB

Furuno FCV-38 data format

See also:

Calibration settings for Furuno FCV-38 data
Common calibration names
Furuno FCV-38 equations for power, Sv, TS and angular position
Calibration Information dialog box

Calibration setting name

ICES CRR No. 326

Table of Terms, symbols, and units
Equivalent name

Help file terminology

Default value

Units

MajorAxis3dbBeamAngle

Transducer beamwidth (α-3 dB, °)

MajorAxis3dbBeamAngle

MajorAxis3dbBeamAngle is assigned the value for beamwidth_receive_major read from the data file.

7.10

degrees

MinorAxis3dbBeamAngle

Transducer beamwidth (β-3 dB, °)

MinorAxis3dbBeamAngle

MinorAxis3dbBeamAngle is assigned the value for beamwidth_receive_minor read from the data file.

7.10

degrees

PulseDuration

Pulse duration (s)

PulseDuration

The Furuno PulseDuration read from the data file.

1.000

ms

TransducerGain

 

TransducerGain

The Furuno TransducerGain (dB) is read from the data file.

26.5

dB

TransmittedPower

Transmit acoustic power (W)

Transmitted power

The Furuno TransmittedPower (W) is read from the data file.

2000

W

TwoWayBeamAngle

Equivalent two-way beam angle

(steradian (sr) or dB re 1 sr)  

Two-way beam angle

The TwoWayBeamAngle is calculated using values for sound speed, frequency and transducer radius read from the data file.

-20.6

dB re 1 Sr

Furuno FSV-25 data format

See also:

Calibration settings for Furuno FSV-25 data
Furuno FSV-25 Sv and TS equations according to the netCDF4 convention.
Furuno FSV data files
Calibration Information dialog box

Calibration setting name

ICES CRR No. 326

Table of Terms, symbols, and units
Equivalent name

Help file terminology

Default value

Units

AbsorptionCoefficient

Absorption coefficient (dB m-1)

Absorption coefficient

The absorption coefficient read from a absorption coefficient-frequency table recorded in the Furuno FSV-25 data file.

Where a frequency is between two frequencies in the table, Echoview linearly interpolates for the absorption coefficient. If a frequency is outside of the tabled frequencies, the absorption coefficient used is of the closest table frequency.

0.010

dB/m

Frequency

Acoustic frequency (Hertz, Hz)

Frequency

Frequency determined from transmit_frequency_start and transmit_frequency_ stop data read from the file.

  • Where transmit_frequency_start is not present in the data file, Frequency is not displayed as a calibration setting.
  • Where transmit_frequency_start and transmit_frequency_stop are present in the data file and their values are unequal, the calibration setting - Frequency is assigned the average of the two values.
  • Where only a transmit_frequency_start value is present in the data file, Frequency is assigned the transmit_frequency_start value.

38

kHz

GainCorrection

 

GainCorrection is determined during the calibration process. This factor accounts for differences between the theoretical response and the observed response during calibration.

0.0000

dB

MajorAxis3dbBeamAngle

Transducer beamwidth (α-3 dB, °)

MajorAxis3dbBeamAngle

MajorAxis3dbBeamAngle is assigned the value for beamwidth_receive_major of beam 0, read from the Furuno FSV-25 data file.

7.10

degrees

MinorAxis3dbBeamAngle

Transducer beamwidth (β-3 dB, °)

MinorAxis3dbBeamAngle

MinorAxis3dbBeamAngle is assigned the value for beamwidth_receive_minor of beam 0, read from the Furuno FSV-25 data file.

7.10

degrees

PulseDuration

Pulse duration (s)

PulseDuration

The pulse duration read from the Furuno FSV-25 data file.

1.000

ms

ReceiveSensitivity

 

Receive sensitivity read from the Furuno FSV-25 data file.

-48.8

dB

SoundSpeed Water sound speed (ms-1)

Sound speed

The sound speed read from the Furuno FSV-25 data file.

1500

m/s

SourceLevel

 

Source level read from the Furuno FSV-25 data file.

205.6

dB

TvgRangeCorrection

 

TvgRangeCorrection

Can be used to calculate Furuno FSV-25 Sv and TS values.

Standard

 

TwoWayBeamAngle

Equivalent two-way beam angle

(steradian (sr) or dB re 1 sr)  

Two-way beam angle

The TwoWayBeamAngle is calculated using values for sound speed, frequency and transducer radius read from the Furuno FSV-25 data file.

-20.6

dB re 1 Sr

Furuno FSV-30 (Research version) data format

See also:

Calibration settings for Furuno FSV-30 (Research version) data
Furuno FSV-30 (Research version) magnitudes and Sv equations
Furuno FSV-30 (Research version) data files
Calibration Information dialog box

Calibration setting name

ICES CRR No. 326

Table of Terms, symbols, and units
Equivalent name

Help file terminology

Default value

Units

AbsorptionCoefficient

Absorption coefficient (dB m-1)

Absorption coefficient

The absorption coefficient read from the Furuno FSV-30 (Research version) data file.

0.010

dB/m

Frequency

Acoustic frequency (Hertz, Hz)

The frequency is read from the Furuno FSV-30 (Research version) data file.

38

kHz

MajorAxis3dbBeamAngle

 

Echoview evaluates the H-mode MajorAxis3dbBeamAngle value when Furuno FSV 30 (Research version) angle and angle weight data are recorded in the file.

The MajorAxis3dbBeamAngle is equivalent to Furuno FSV-30 (Research version) beamwidth_receive_major. The equations are specific to Furuno FSV 30 (Research version) data.

MajorAxis3dbBeamAngle may be used for the calculation of TwoWayBeamAngle.

7.10

degrees

MinorAxis3dbBeamAngle

 

Echoview evaluates the H-mode MinorAxis3dbBeamAngle value when Furuno FSV 30 (Research version) angle and angle weight data are recorded in the file.

The MinorAxis3dbBeamAngle is equivalent to Furuno FSV-30 (Research version) beamwidth_receive_minor. The equations are specific to Furuno FSV 30 (Research version) data.

MinorAxis3dbBeamAngle may be used for the calculation of TwoWayBeamAngle.

7.10

degrees

MinorAxis3dbBeamAngleTransmit

 

Echoview evaluates the H-mode MinorAxis3dbBeamAngleTransmit value when Furuno FSV 30 (Research version) angle and angle weight data are recorded in the file.

MinorAxis3dbBeamAngleTransmit is equivalent to Furuno FSV-30 (Research version) beamwidth_transmit_minor. The equations are specific to Furuno FSV 30 (Research version) data.

MinorAxis3dbBeamAngleTransmit may be used for the calculation of TwoWayBeamAngle.

7.10

degrees

PulseDuration

 

PulseDuration

The pulse duration read from the Furuno FSV-30 (Research version) data file.

1.000

ms

SoundSpeed  

Sound speed

1500

m/s

SourceLevel

 

Source level is read from the Furuno FSV-30 (Research version) data file.

205.6

dB

TvgRangeCorrection

 

TvgRangeCorrection

Standard

 

TwoWayBeamAngle

 

Two-way beam angle

The TwoWayBeamAngle is read from the Furuno FSV-30 (Research version) data file.

For H-mode Sv data, where MajorAxis3dbBeamAngle, MinorAxis3dbBeamAngle and MinorAxis3dbBeamAngleTransmit data are available in the data file, the TwoWayBeamAngle is calculated.

-20.6

dB re 1 Sr

HTI data format

See also:

Calibration settings for HTI data
Common calibration names
Calibration Information dialog box

Calibration setting name

ICES CRR No. 326

Table of Terms, symbols, and units
Equivalent name

Help file terminology

Default value

Units

HtiAequip

 

Aequip. Used by HTI version 0.0 .INT files (you will need to calculate the value for Aequip).

For other HTI file types Aequip-related calculations are handled by Echoview.

See also HTI integrated data: Notes.

1.00E-06

BeamPatternFactor

 

This is the Beam_Pattern_Factor used in the HTI sample data to Sv, TS and angular position equations.

0.016

dB

ChirpBandwidth

  This is the Chirp_Bandwidth used in the HTI sample data to Sv, TS and angular position equations.

0

kHz

MajorAxisAngleRatio

  This is the Horizontal ratio used in the HTI sample data to Sv, TS and angular position equations. -16

MinorAxisAngleRatio

 

This is the Vertical ratio used in the HTI sample data to Sv, TS and angular position equations.

-26

ReceiverGain20Log

 

This is the Receiver_Gain_20_Log read from a *.smp file, where settings and data are stored together, and is used as Receiver_Gain in the HTI sample data to Sv, TS and angular position equations.

Where a *.cfg file accompanies a *.smp file, this is the Receiver_Gain read from the *.cfg file and used in the HTI sample data to Sv, TS and angular position equations.

-6

ReceiverGain40Log

 

This is the Receiver_Gain_40_Log read from a *.smp file, where settings and data are stored together, and used as Receiver_Gain in the HTI sample data to Sv, TS and angular position equations.

Where a *.cfg file accompanies a *.smp file, this is the Receiver_Gain read from the *.cfg file and used in the HTI sample data to Sv, TS and angular position equations.

-6

SamplingFrequency

  Can be read from an HTI .raw file. See also SamplingFrequency (defined).

44.1

kHz

SoundSpeed

 

SoundSpeed can be read from version 1.06 SMP files. Other HTI data file types may not record SoundSpeed or may record it in associated *.cfg or *.cal files.

1500

m/s

SourceLevel

 

This is the Source_level_n used in the HTI sample data to Sv, TS and angular position equations.

205.6

dB

ThroughSystemGain20Log

 

This is the Log_20 Through System Gain used in the HTI sample data to Sv, TS and angular position equations.

-151

ThroughSystemGain40Log

 

This is the Log_40 Through System Gain used in the HTI sample data to Sv, TS and angular position equations.

-171

TvgCrossover20Log

 

This is the Tvg_Crossover used in the HTI sample data to Sv, TS and angular position equations.

-11.2

TvgGain20Log

 

This is read from a *.smp file, where settings and data are stored together, and used as Tvg_Gain in the HTI sample data to Sv, TS and angular position equations.

Where a *.cfg file accompanies a *.smp file, this is the Tvg_Gain read from the *.cfg file and used in the HTI sample data to Sv, TS and angular position equations.

20.98

dB

TvgGain40Log

 

This is read from a *.smp file, where settings and data are stored together, and used as Tvg_Gain in the HTI sample data to Sv, TS and angular position equations.

Where a *.cfg file accompanies a *.smp file, this is the Tvg_Gain read from the *.cfg file and used in the HTI sample data to Sv, TS and angular position equations.

20.98

dB

Notes:

  • Version Echoview 5.3 or earlier required the calculation of Aequip for version 0.0 .INT files.

Sonic data format

See also:

Calibration settings for Sonic data
Common calibration names
Calibration Information dialog box

Calibration setting name

ICES CRR No. 326

Table of Terms, symbols, and units
Equivalent name

Help file terminology

Default value

Units

CalibrationOffsetSv

 

A setting that can offset the Sv value. It may be useful when you need to adjust the Sv value for calibration sphere procedures or for Sv to TS conversions.

0

dB

CalibrationOffsetTs

 

A setting that can offset the TS value. It may be useful when you need to adjust the TS value for calibration sphere procedures or for TS to Sv conversions.

0

dB

KaijoTRFactor

 

T/R factor

62.8

None

SonicTransducerRadiusCoefficient

 

Sonic KFC-6000/KSE-300 coefficient used with Sonic split-beam beam compensation. The coefficient is a function of the transducer radius and wavelength.

3.5

SonicArrayCenterDistance

 

Sonic KFC-6000/KSE-300 coefficient for the distance between array centers. It is used in the calculation of Sonic KFC-6000/KSE-300 angles.

2.0

TRFactor

 

Sonic KFC-6000/KSE-300 T/R factor.

62.8

None

Nortek data format

See also:

Calibration settings for Nortek data
Nortek Power, Sv and TS equations
Common calibration names
Calibration Information dialog box

Calibration setting name

ICES CRR No. 326

Table of Terms, symbols, and units
Equivalent name

Help file terminology

Default value

Units

AbsorptionDepth

 

The AbsorptionDepth is calculated from Pressure, Salinity, Temperature and Acidity values read from the data file.

250

m

PulseDuration

 

The Nortek configured transmit length read from the data file.

1

ms

SoundSpeed

 

The Nortek nominal sound speed is 1500 m/s and it is used to calculate the sample range. To modify the sound speed use an ECS file.

1500

m/s

TransmittedPower

 

The TransmittedPower is read from the PL value recorded in the data file.

2000

W

PAS HARP data format

See also:

Precision Acoustics Systems data files
Calibration settings for PAS data
Common calibration names
Calibration Information dialog box

These calibration settings are used in equations outlined in Precision Acoustics Systems data files.

Calibration setting name

ICES CRR No. 326

Table of Terms, symbols, and units
Equivalent name

Help file terminology

Default value

Units

HarpChannelGain

 

Channel gain (dB)

40

dB

HarpStaticGain

 

Static gain (G1) (dB)

-112

dB

HarpSourceLevel

 

Source level (dB)

215

dB

HarpAdcCorrectionX

 
  • Split-beam TS calibration setting
  • ADC correction X-axis

2048

HarpAdcCorrectionY

 
  • Split-beam TS calibration setting
  • ADC correction Y-axis

1990

HarpPdcCorrectionX

 
  • Split-beam TS calibration setting
  • PDC correction X-axis

400

HarpPdcCorrectionY

 
  • Split-beam TS calibration setting
  • PDC correction Y-axis

960

HarpPdiCorrectionX

 
  • Split-beam TS calibration setting
  • PDI correction X-axis

-139700

HarpPdiCorrectionY

 
  • Split-beam TS calibration setting
  • PDI correction Y-axis

-129700

HarpPhaseAngleCorrectionX

 
  • Split-beam TS calibration setting
  • Phase angle correction X-axis

2049

HarpPhaseAngleCorrectionY

 
  • Split-beam TS calibration setting
  • Phase angle correction Y-axis

1991

Simrad SM2000 data format

See also:

Calibration settings for SM2000 data
Common calibration names
Calibration Information dialog box

Calibration setting name

ICES CRR No. 326

Table of Terms, symbols, and units
Equivalent name

Help file terminology and ECS file example

Default value

Units

SM2000BeamsToForm

 

A beamforming calibration setting that specifies the Number of beams to form.

128

SM2000Sector

 

A beamforming calibration setting that specifies the Sector.

Note: Another beamforming setting is Sound speed (a common calibration setting).

120

Degrees

SM2000HeadType

 

SM2000 Transducer head setting for the Head type (deg).

Typical Head values:

Head type
(degrees)
Head radius
(meters)
Head spacing
(degrees)
180Degrees
0.1100
1.9620
120Degrees
0.2000
1.1160
90Degrees
0.3874
1.2000
60Degrees
0.4293
0.8496

None

None
60Degrees
90Degrees
120Degrees
180Degrees

SM2000Radius

 

SM2000 Transducer head setting for the Head Radius (m).

0

Meters

SM2000Spacing

 

SM2000 Transducer head setting for the Head spacing (deg).

0

Degrees

Simrad EK80 data format

The Simrad EK80 data format uses calibration settings that are drawn from common and other transducer specific settings.

See also:

Calibration settings for Simrad EK80 data
Common calibration names
About transmitted pulse
Calibration Information dialog box

The following are Simrad EK80 specific settings.

Calibration setting name

ICES CRR No. 326

Table of Terms, symbols, and units
Equivalent name

Help file terminology

Default value

Units

AbsorptionCoeffcient

 

Absorption coefficient.

EK80 single frequency (CW) variables use a calculated value for AbsorptionCoefficient based on environmental data read from the file. Environmental data includes water temperature, salinity, acidity, depth, sound speed and frequency.

EK80 FM variables also use environmental data to calculate wideband absorption coefficients.

For both CW and FM variables, an absorption-coefficient override can be applied by specifying an AbsorptionCoefficient value under an appropriate SourceCal in an ECS file.

0.01

dB/m

AbsorptionDepth

 

Read from EK80 data file and used as depth in the Francois & Garrison (1982) equation.

The Francois & Garrison (1982) equation calculates the absorption coefficient using acidity, temperature and salinity, frequency and depth.

250

meters

Acidity

 

Read from EK80 data file. See Common calibration names: Acidity.

The Francois & Garrison (1982) equation calculates the absorption coefficient using acidity, temperature and salinity, frequency and depth.

8.0

pH

EffectivePulseDuration

 

The EffectivePulseDuration is calculated using the EK80 matched filter. EffectivePulseDuration is used in the calculation of continuous wave Sv and wideband Sv raw variables and may be modified using an ECS file.

For EK80 CW data recorded as non-complex data, the EffectivePulseDuration may be calculated using the TransceiverSamplingFrequency.

A deprecated alias is EffectivePulseLength.

1

ms

SaCorrectionFactor

 

SaCorrectionFactor is read from EK80 CW data and is used in the EK80 CW Power to Sv equation.

The Sa correction factor is determined during the calibration process of EK80 CW instruments. The value represents the correction required to the Sv constant to harmonize the TS and Sa (NASC) measurements. Sa corrections are only determined during a calibration, otherwise they are zero.

A deprecated alias is EK60SaCorrection.

0

dB

FrequencyEnd

 

Wideband end frequency.

38

kHz

FrequencyStart

 

Wideband start frequency.

38

kHz

FrequencyTableWideband

 

Simrad frequency-dependent Frequency read from an instrument calibrated EK80 data file. FrequencyTableWideband frequency values at array positions are correlated with associated wideband table array data.

See Common calibration names: FrequencyTableWideband and Array position and element number note.

Hz

GainTableWideband

 

Simrad frequency-dependent Gain read from an instrument calibrated EK80 data file.

Array values/interpolated values are used in place of the TransducerGain.

See Common calibration names: GainTableWideband and Array position and element number note.

dB

MinorAxisAngleOffsetTableWideband

 

Simrad frequency-dependent AngleOffsetAlongship read from an instrument calibrated EK80 data file.

See Common calibration names: MinorAxisAngleOffsetTableWideband and Array position and element number note.

degrees

MajorAxisAngleOffsetTableWideband

 

Simrad frequency-dependent AngleOffsetAthwartship read from an instrument calibrated EK80 data file.

See Common calibration names: MajorAxisAngleOffsetTableWideband andArray position and element number note.

degrees

MinorAxisBeamWidthTableWideband

 

Simrad frequency-dependent BeamWidthAlongship read from an instrument calibrated EK80 data file.

Array values/interpolated values are used in place of the MinorAxis3dbBeamAngle.

See Common calibration names: MinorAxisBeamWidthTableWideband andArray position and element number note.

degrees

MajorAxisBeamWidthTableWideband

 

Simrad frequency-dependent BeamWidthAthwartship read from an instrument calibrated EK80 data file.

Array values/interpolated values are used in place of the MajorAxis3dbBeamAngle.

See Common calibration names: MajorAxisBeamWidthTableWideband and Array position and element number note.

degrees

NumberOfTransducerSegments

 

The NumberOfTransducerSegments is read from data files recorded from wideband transceivers. It records the number of transducer segments for the beam. The value is used in the calculation of EK80 received power.

  • 4 is the value for a split beam transducer
  • 3 is the value for a 3 segment transducer
  • 2 is the value for a 2 segment transducer
  • 1 is the value for a single beam transducer

PulseCompressedEffectivePulseDuration

 

The PulseCompressedEffectivePulseDuration is calculated using the EK80 auto-correlated matched filter. PulseCompressedEffectivePulseDuration is used in the calculation of pulse compressed wideband Sv raw variables and Single target detection - wideband virtual variables and may be modified using an ECS file.

A deprecated alias is PulseCompressedEffectivePulseLength.

1

ms

Salinity

 

Read from the EK80 data file. See Common calibration names: Salinity.

The Francois & Garrison (1982) equation calculates the absorption coefficient using acidity, temperature and salinity, frequency and depth.

32

parts per thousand

SamplingFrequency

 

Read from the EK80 data file. See Sampling frequency.

44.10

kHz

Temperature

 

Read from the EK80 data file. See Common calibration names: Temperature.

The Francois & Garrison (1982) equation calculates the absorption coefficient using acidity, temperature and salinity, frequency and depth.

10

degrees Celsius

TransceiverImpedance  

This is the Simrad transceiver impedance recorded under the Transceiver element of the data file. This impedance represents the internal electrical resistance of the WBT unit and is used for the calculation of received power.

Note: Some versions of EK80 files may not record an impedance under the Transceiver element. In such cases a value of 1000 Ohms is used. Please contact Simrad for further information.

1000

Ohms

TransducerImpedanceTableWideband  

This is a Simrad transducer impedance. The EK80 Calibration XML file can record a frequency-dependent array under the Impedance element. Echoview also reads such data, when it is present in an EK80 .raw file. However, Echoview does not use the data for EK80 calculations. The calibration setting is hidden but is available to ECS files and EVD files for the sake of completeness.

See also ECS and EVD issue for TransducerImpedanceTableWideband.

1000

Ohms

TransceiverSamplingFrequency

 

TransceiverSamplingFrequency may be read from the EK80 data file. It may be recorded when data is saved as non-complex data at reduced sampling rate or a reduced file size. TransceiverSamplingFrequency is used to calculate the decimated sampling frequency and the EffectivePulseDuration.

Note: An instrument-specific TransceiverSamplingFrequency may be used when RxSampleFrequency is not be present in the data file.

1500

kHz

TransducerGain

  Read from the EK80 data file. See Common calibration names: TransducerGain.

26.5

dB

TransducerModeActive

 

Determined from Channelmode read from the EK80 data file.

TransducerModeActive is true for active ping data (Channelmode=0).

TransducerModeActive is false for passive ping data (Channelmode=1).

An example is to filter active or passive pings (refer to the Glossary) with the Calibration subset operator by setting limits around the Channelmode value.

True

True, False

TransmittedPower

 

Read from the EK80 data file. See Transmitted power.

2000

Watts

PulseDuration

 

Simrad EK80 data files may record PulseDuration values under alternative names.

A deprecated alias is TransmittedPulseLength.

1

ms

TvgRangeCorrection

 

TvgRangeCorrection is Simrad EK80. Which applies a half pulse length correction to the Sv variable only.

Simrad EK80

Notes:

  • FrequencyTableWideband frequency values at array positions are correlated with associated wideband table array data. FrequencyTableWideband values can be changed through an ECS file. Numerical ordering should be maintained, otherwise frequency values from the array may be applied incorrectly to your wideband table data. When the number of wideband table array elements don't match those in FrequencyTableWideband, Echoview sends a message to the Messages dialog box and Echoview will use equations for the single frequency case.
  • Where the wideband table has a missing frequency (and therefore a missing calibration value), Echoview calculates a calibration value using linear interpolation between known data either side of the missing frequency.
  • When FrequencyTableWideband doesn't overlap with the ping frequency range, the table is not loaded or used.
  • Within an ECS file, wideband table array values may be delimited by a space or semicolon.

Simrad omnisonar netCDF data format

The Simrad omnisonar netCDF data format uses calibration settings that are drawn from common and other transducer specific settings.

See also:

Calibration settings for Simrad omnisonar netCDF data
Common calibration names
Calibration Information dialog box

Calibration setting name

ICES CRR No. 326

Table of Terms, symbols, and units
Equivalent name

Help file terminology and ECS file example

Default value

Units

AbsorptionCoefficient

Absoprtion coefficient (dB m-1)

Absorption coefficient

Absorption coefficent is used in the calculation of Sv and TS with respect to the netCDF4 convention.

0.01

dB/m

EffectivePulseDuration   The EffectivePulseDuration is read from the data file and used in the calculation of Sv.

1.000

milliseconds

Frequency

Acoustic frequency (Hertz, Hz)

Frequency read from file.

38.0

kHz

FrequencyEnd

 

End frequency read from file and used in the calculation of wavelength.

38.0

kHz

FrequencyStart

 

Start frequency read from file and used in the calculation of wavelength.

38.0

kHz

MajorAxis3dbBeamAngle

 Transducer beamwidth offset (α0, °)

MajorAxis3dbBeamAngle

7.10

Degrees

MajorAxis3dbBeamAngleTransmit

 

Major -axis component of the transmitted cone angle (aka Tilt). Tilt angle is used in the calculation of Sv and TS.

7.10

Degrees

MinorAxis3dbBeamAngle

Transducer beamwidth (β-3 dB, °)

MinorAxis3dbBeamAngle

7.10

Degrees

MinorAxis3dbBeamAngleTransmit

 

Minor-axis component of the transmitted cone angle (aka Tilt). Tilt angle is used in the calculation of Sv and TS.

7.10

Degrees

PulseDuration

Pulse duration (s)

PulseDuration

Nominal transmit duration is read from the data file and may be used in the calculation of Sv when EffectivePulseDuration is unavailable.

1.000

milliseconds

SoundSpeed

Water sound speed (ms-1)

SoundSpeed

sound speed is used in the calculation of Sv and TS.

1500

m/s

SourceLevel

Source level (dB re 1 μPa at r0)

Transducer source level read from the file.

205.6

dB

TransducerGain

 

Transducer gain is read from the file and used in the calculation of Sv and TS.

26.5

dB

TransmittedPower

Transmit acoustic power (W)

Transmit power read from the file used in the calculation of Sv and TS.

2000

W

TvgRangeCorrection

 

TvgRangeCorrection

TvgRangeCorrection is assigned as Standard.

None

-

TwoWayBeamAngle

Equivalent two-way beamangle 

(steradian (sr) or dB re 1 sr)  

TwoWayBeamAngle

Two-way beam angle is read from the file and is used in the calculation of Sv.

-20.6

dB re 1 steradian

See also

Using Echoview in the calibration process
Calibration settings for virtual variables
About time varied gain