Kongsberg EK80 Instruction Manual
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Kongsberg EK80 Instruction Manual

Wideband scientific echo sounder
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INSTRUCTION
MANUAL
TS Calibration EK80
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  • Page 1 INSTRUCTION MANUAL TS Calibration EK80 kongsberg.com/ek80...
  • Page 3 PUBLIC Kongsberg EK80 Wideband scientific echo sounder User manual for TS calibration Release 23.6.0 110-0001152/A August 2023 © Kongsberg Maritime AS...
  • Page 4 The information contained in this document remains the sole property of Kongsberg Maritime AS. No part of this document may be copied or reproduced in any form or by any means, and the information contained within it is not to be communicated to a third party, without the prior written consent of Kongsberg Maritime AS. Warning The equipment to which this manual applies must only be used for the purpose for which it was designed.

  • Page 5: Table Of Contents

    User manual for TS calibration Table of contents ABOUT THIS MANUAL ..............5 INTRODUCTION................7 Calibration for target strength (TS) measurements..............7 Support information ........................ 9 TS CALIBRATION............... 10 Preparing TS calibration ....................... 10 Selecting Normal Operation parameters for TS calibration ..........13 Recording raw data .......................
  • Page 6 Kongsberg EK80 110-0001152/A...

  • Page 7: About This Manual

    About this manual About this manual This publication provides you with the basic information required to calibrate the EK80 system fitted with relevant hardware for target strength (TS) measurements. Relevant products This publication provides you with the basic information required to calibrate the EK80 system for current indicator measurements.
  • Page 8 ® Simrad , SIMRAD and the Simrad logo are either registered trademarks, or trademarks of Kongsberg Maritime AS in Norway and other countries. ® Windows is a registered trademark of Microsoft Corporation in the United States and other countries. We want your feedback We always want to improve our products.

  • Page 9: Introduction

    We recommend that you perform a calibration both before and after an important survey. When starting, the EK80 system does a validation check of the calibration. It checks if the previous calibration was done using the same transceiver as in current use. If this is not the case a message will require a new calibration.
  • Page 10 A TS calibration can also be a "sanity" check of the system, as it allows you to verify that all parts of the system work correctly. We recommend that you calibrate the EK80 in calm sea. In areas with calm sea and low sea currents, positioning the sphere and keeping it within the detection area of the EK80 transducer is easier.

  • Page 11: Support Information

    Introduction Support information If you need technical support for your EK80, you must contact your local dealer, or one of our support offices. A list of all our offices and dealers is available on our website. You can also contact our main support office in Norway.

  • Page 12: Ts Calibration

    Calibration is the best way to check and verify both the operational performance of the EK80 and the quality of the installation. In order to perform a TS calibration of the EK80 system, a reference target (calibration sphere) with known TS is lowered into the sound beam.
  • Page 13 Any adjustments to the EK80 system files are done automatically. No gain adjustments are required. Note Calibration must be taken seriously. To achieve the best results, the calibration must be planned and done carefully. In an EK80 system consisting of more than one transceiver, you must calibrate them one by one. 110-0001152/A...
  • Page 14 • Reconnecting an already calibrated transducer and transceiver pair, the old calibration data may be retrieved and used. A new calibration is not required. A new calibration may also be required if the EK80 software is updated. Refer to the software release note.

  • Page 15: Selecting Normal Operation Parameters For Ts Calibration

    Note When you calibrate the EK80 system for TS measurements with "live data", it is very important that you choose the correct channel, and that all the other channels are switched to Passive mode. You must do this before you start the calibration process.

  • Page 16: Recording Raw Data

    Recording raw data Use the raw data recording functionality provided by the EK80 system to save echo data using the format. You can save the data to the hard disk, or onto an external storage *.raw...

  • Page 17: Starting Ts Calibration And Collecting Echo Data For Split-Beam Transducers

    Context When you calibrate the EK80 system for TS measurements with "live data", it is very important that you choose the correct channel, and that all the other channels are switched to Passive mode. You must do this before you start the calibration process.
  • Page 18 Kongsberg EK80 User manual for TS calibration On the page, define the relevant file and folder properties. File Setup Note We strongly recommended that you always store the raw data from the calibration. Set up the file and folder parameters before you start the recording.
  • Page 19 • During the data import, use the three winches to move the sphere inside the sound beam. To successfully calibrate the EK80 system you need to place a number of target detections in each slice. The echoes must be distributed within the entire beam cross-section.

  • Page 20: Starting Ts Calibration And Collecting Echo Data For Single-Beam Transducers

    Context When you calibrate the EK80 system for TS measurements with "live data", it is very important that you choose the correct channel, and that all the other channels are switched to Passive mode. You must do this before you start the calibration process.
  • Page 21 TS calibration On the page, define the relevant file and folder properties. File Setup Note We strongly recommended that you always store the raw data from the calibration. Set up the file and folder parameters before you start the recording. Use the file name to identify the your physical location, the frequency used, which calibration sphere that is used, and the pulse form.
  • Page 22 Kongsberg EK80 User manual for TS calibration Adjust the size of the dialog box so that you can also see the Calibration Wizard echogram. In the Frequency/Target Strength field, verify that the calibration target (sphere) is useful for the chosen frequency range.

  • Page 23: Choosing Which Raw Data File(S) To Replay

    When you record echo data the information is stored on the Processor Unit hard disk. Depending on your initial settings, the files can also be stored on an external storage device or a network disk. The echo data files can be retrieved and played back on the EK80 system. Context All playback is controlled by the replay bar.

  • Page 24: Cleaning The Collected Ts Data (Split-Beam Transducers)

    The fifth page in the allows you to manually "clean" the echo data before Calibration Wizard you process it to calibrate the EK80. When the processing is finished, you can save the results, and update the calibration data used by the EK80. Prerequisites In order to process echo data for calibration, you must have imported and saved valid echo data from a relevant calibration target (sphere) inside the beam.

  • Page 25: Cleaning The Collected Ts Data (Single-Beam Transducers)

    The fifth page in the allows you to manually "clean" the echo data before Calibration Wizard you process it to calibrate the EK80. When the processing is finished, you can save the results, and update the calibration data used by the EK80. Prerequisites In order to process echo data for calibration, you must have imported and saved valid echo data from a relevant calibration target (sphere) inside the beam.

  • Page 26: Modifying, Adding And Removing A Frequency Band

    TS. You can remove one or more frequency bands from the calibration processing. This is done by defining "stop bands". The EK80 is not calibrated for the frequencies inside the chosen frequency band. Prerequisites In order to manually add or remove a sphere frequency band, the sphere must be registered in the EK80 calibration software.

  • Page 27: Functions And Dialog Boxes

    Prerequisites can only be opened from within the calibration process. Calibration Wizard How to open To open the , place the EK80 system in either Normal or Replay mode, Calibration Wizard then select on the menu. Calibration...

  • Page 28: Calibration Wizard Dialog Box #2 (Select Channel)

    The second page in the allows you to select the channel to be calibrated. Calibration Wizard Prerequisites can only be opened from within the calibration process. Calibration Calibration Wizard can only be started with the EK80 system in either Normal or Replay mode. 110-0001152/A...
  • Page 29 To use the last used transducer parameters, simply continue. When you calibrate the EK80 system for TS measurements with "live data", it is very important that you choose the correct channel, and that all the other channels are switched to Passive mode.

  • Page 30: Calibration Wizard Dialog Box #3 (Select Sphere)

    Prerequisites can only be opened from within the calibration process. Calibration Calibration Wizard can only be started with the EK80 system in either Normal or Replay mode. How to open To open the , place the EK80 system in either Normal or Replay mode,...
  • Page 31 (Cu). The former is also referred to as Wolfram carbide (Wo-Co). "Co" is short for Cobalt, which is used as binder in the sphere. Note Kongsberg Maritime can supply a variety of copper and tungsten calibration spheres dedicated for different operational frequencies. Contact your dealer or the Kongsberg support organization for advice.
  • Page 32 You can remove one or more frequency bands from the calibration processing. This is done by defining "stop bands". The EK80 is not calibrated for the frequencies inside the chosen frequency band. The software in the EK80 will instead interpolate calibration values.

  • Page 33: Calibration Wizard Dialog Box #1

    Functions and dialog boxes As an alternative, you can do the entire calibration one more time using another sphere. The results from the second calibration must then be merged with the results from the first calibration. Details Select Sphere You can use this function to select another sphere from the drop down menu. Add Sphere Select this option to add a new sphere (calibration target) to the list.

  • Page 34: Calibration Wizard Dialog Box #4 (Import Data): Split-Beam Transducer

    Prerequisites can only be opened from within the calibration process. Calibration Calibration Wizard can only be started with the EK80 system in either Normal or Replay mode. How to open To open the , place the EK80 system in either Normal or Replay mode,...
  • Page 35 Functions and dialog boxes • Frequency/Target Strength field The Frequency/Target Strength field shows a curve reflecting the TS of the sphere for individual frequencies. This is the same curve as you can see in the Calibration Wizard dialog box page four, but with a few additional features. •...
  • Page 36 Kongsberg EK80 User manual for TS calibration The right side of the field shows the calibration layer that is automatically created once the calibration starts. You can see how each individual echo is received within the calibration layer. This calibration layer is automatically established when the Calibration is started.
  • Page 37 The circular cross-section is split into several slices. To successfully calibrate the EK80 system you need to place a number of target detections in each slice. The echoes must be distributed within the entire beam cross-section.
  • Page 38 Kongsberg EK80 User manual for TS calibration Channel Data page displays numerical parameters related to the transceiver Channel Data channel that was used to record the echo data. When you calibrate in FM, the page also offers curves to monitor the gain, the beamwidth and the beam offset as a function of the operating frequency.
  • Page 39 Functions and dialog boxes • : This column shows the TS value of the hit with the beam pattern TS Comp compensation included. • : This column presents the TS value of the hit before the beam pattern TS Uncomp compensation is added.
  • Page 40 Kongsberg EK80 User manual for TS calibration During the calibration process, the calibration layer must be monitored and adjusted to compensate for the target’s depth changes. These depth changes are easy to see in the echogram, or on the right side of the Target Position field. The depth limits of the calibration layer can be adjusted in three different ways: •...
  • Page 41 Functions and dialog boxes TS Deviation This setting is located on the page in the Numerical field. The General TS Deviation setting allows you to control the maximum permitted deviation for the echoes from the calibration target (sphere). Echoes outside the defined limit are not imported. The limit you select is shown in the Frequency/Target Strength field.

  • Page 42: Calibration Wizard Dialog Box #4 (Import Data): Single-Beam Transducer

    Prerequisites can only be opened from within the calibration process. Calibration Calibration Wizard can only be started with the EK80 system in either Normal or Replay mode. How to open To open the , place the EK80 system in either Normal or Replay mode,...
  • Page 43 Functions and dialog boxes • Frequency/Target Strength field The Frequency/Target Strength field shows a curve reflecting the TS of the sphere for individual frequencies. This is the same curve as you can see in the Calibration Wizard dialog box page four, but with a few additional features. •...
  • Page 44 Kongsberg EK80 User manual for TS calibration The right side of the field shows the calibration layer that is automatically created once the calibration starts. You can see how each individual echo is received within the calibration layer. This calibration layer is automatically established when the Calibration is started.
  • Page 45 Functions and dialog boxes For FM: The purple line reflects the received echo of the current "ping". The curve reflects the TS value as a function of the frequency. TS Histogram plot presents a histogram with the echoes from the calibration sphere. The TS Histogram histogram provides a visual indication of the percentage of echoes located on the decibel scale within the chosen interval.
  • Page 46 Kongsberg EK80 User manual for TS calibration TS Data page shows you all echoes that are detected and accepted. The list will TS Data expand as you collect data.The page consists of a table with different columns: • : This column shows the sequential number of the hit.
  • Page 47 Functions and dialog boxes Calibration layer When the calibration process is started, a dedicated layer is automatically created. If a strong and easily detected echo from the calibration sphere is shown in the echogram, the layer will position its borders over and under the target. You must lower the sphere to a known depth.
  • Page 48 Kongsberg EK80 User manual for TS calibration Details Start/Stop/Continue This button starts (and stops) the import of echo data to the calibration program. While the import is active, each echo is drawn in the Target Position field. When you are calibrating with "live data", keep importing echoes until these are evenly distributed...
  • Page 49 Functions and dialog boxes Minimum/Maximum Depth These settings are located on the page in the Numerical field. Use these General parameters to adjust the depth limits of the calibration layer, thus creating a "depth window". Echoes from objects outside the defined limits are not imported. You must lower the sphere to a known depth.

  • Page 50: Calibration Wizard Dialog Box #5 (Process Data): Split-Beam Transducer

    The fifth page in the allows you to manually "clean" the echo data before Calibration Wizard you process it to calibrate the EK80. When the processing is finished, you can save the results, and update the calibration data used by the EK80. Prerequisites can only be opened from within the calibration process.
  • Page 51 Functions and dialog boxes • Target Position field The left side of the Target Position field shows all the individual echoes that are imported into the calibration program. All echoes are placed inside a circle to reflect their locations in the beam. The right side of the field shows the calibration layer that is automatically created once the calibration starts.
  • Page 52 Kongsberg EK80 User manual for TS calibration Target Position field The left side of the Target Position field shows all the individual echoes that are imported into the calibration program. All echoes are placed inside a circle to reflect their locations in the beam. The...
  • Page 53 Functions and dialog boxes The right side of the field shows the calibration layer that is automatically created once the calibration starts. You can see how each individual echo is received within the calibration layer. This calibration layer is automatically established when the Calibration is started.
  • Page 54 Kongsberg EK80 User manual for TS calibration Numerical field This field is located on the right side of the dialog box. The Numerical Calibration Wizard field provides several tabbed pages. General page page shows the common data and parameters for the system used during General calibration.
  • Page 55 Functions and dialog boxes • : Select the check box in this column to exclude the hit from the Suspended calibration. • : This column shows the sequential number of the hit. Number • : This column presents the time of the hit. Time •...
  • Page 56 Kongsberg EK80 User manual for TS calibration Results page page displays the numerical parameters that are created by the calibration Results processing. Different results are offered for CW and FM calibration. • After an FM calibration, the results are provided as graphs for beam offset, beam width and gain as a function of the frequency.
  • Page 57 Functions and dialog boxes Note The S correction is only calculated for CW transmissions. • When calibrating a Wide Band Transceiver (WBT), the effective pulse duration is calculated and used to establish the S correction. This will normally result in correction around 0 dB.
  • Page 58 Kongsberg EK80 User manual for TS calibration The error analysis is based on an estimated TS value from your calibration sphere. This estimate is based on the sphere parameters, the depth and the operational frequency. Each echo is shown using a colour to indicate the error of the hit. This allows you to locate echoes that are stronger or weaker than the estimated TS.
  • Page 59 XML file. Finish Select to terminate the calibration process. The calibration results are Finish automatically implemented by the EK80 program. Select to save the calibration data. Save Save As Update the calibration used by the echo sounder using...

  • Page 60: Calibration Wizard Dialog Box #5 (Process Data): Single-Beam Transducer

    The fifth page in the allows you to manually "clean" the echo data before Calibration Wizard you process it to calibrate the EK80. When the processing is finished, you can save the results, and update the calibration data used by the EK80. Prerequisites can only be opened from within the calibration process.
  • Page 61 Functions and dialog boxes Note TS measurements can be single or split beam. For combi transducers, make sure that you know which channel is used for single beam and which one is used for split beam. In the third page of the dialog box, select the sphere to calibrate for and Calibration Wizard select...
  • Page 62 Kongsberg EK80 User manual for TS calibration Target Position field The left side of the Target Position field shows all the individual echoes that are imported into the calibration program. All echoes are placed in the centre of a circle, which represents the transducer's beam.
  • Page 63 Functions and dialog boxes The right side of the field shows the calibration layer that is automatically created once the calibration starts. You can see how each individual echo is received within the calibration layer. This calibration layer is automatically established when the Calibration is started.
  • Page 64 Kongsberg EK80 User manual for TS calibration Numerical field This field is located on the right side of the dialog box. The Numerical Calibration Wizard field provides several tabbed pages. General page page shows the common data and parameters for the system used during General calibration.
  • Page 65 Functions and dialog boxes • : This column shows the sequential number of the hit. Number • : This column presents the time of the hit. Time • : This column shows the range of the hit. Range • : This column shows the TS value of the hit with the beam pattern TS Comp compensation included.
  • Page 66 Kongsberg EK80 User manual for TS calibration Results page page displays the numerical parameters that are created by the calibration Results processing. Different results are offered for CW and FM calibration. • After an FM calibration, the results are provided as graphs for beam offset, beam width and gain as a function of the frequency.
  • Page 67 Functions and dialog boxes Note The S correction is only calculated for CW transmissions. • When calibrating a Wide Band Transceiver (WBT), the effective pulse duration is calculated and used to establish the S correction. This will normally result in correction around 0 dB.
  • Page 68 Kongsberg EK80 User manual for TS calibration You can also select a single echo in the Target Position field. The corresponding row in the list will be shown with a grey background colour. TS Data To remove a single echo from the calibration processing, select in the left column.
  • Page 69 Functions and dialog boxes interpolation will be done to cover those gaps. The linearly interpolated values are not output to the calibration files. – Use to remove all old calibration results. This allows you to only use the Replace latest parameters for the relevant channel. In FM, one single set of calibration values is saved, and this set covers all pulse durations.

  • Page 70: Secondary Functions And Dialog Boxes

    Description A key function of the EK80 system is its ability to record echo data. You can save the data to the hard disk, or onto an external storage device. The dialog box allows you to Replay File choose which file(s) to be used for playback.
  • Page 71 Loop Select if you want the EK80 system to play back all the files in an endless loop. Loop The replay will run until you stop it in the replay bar, or choose a different operating mode.

  • Page 72: Edit/Add Sphere Dialog Box

    Add/Edit Sphere Calibration Wizard dialog box. The can only be opened from within the calibration process. Calibration Wizard Calibration can only be started with the EK80 system in either Normal or Replay mode. 110-0001152/A...
  • Page 73 Type the name you wish to use to identify the calibration sphere. Note that while editing the sphere parameters, you are not permitted to change its name. If you do not have a computer keyboard connected to your EK80 system, select the button to open an on-screen keyboard.

  • Page 74: Calibration Description Dialog Box

    How to open dialog box is opened from the third and fourth pages in the Calibration Description Calibration Wizard To open the , place the EK80 system in either Normal or Replay mode, Calibration Wizard then select on the menu.

  • Page 75: Single Target Detection Dialog Box

    How to open dialog box can be opened from the third and fourth pages in Single Target Detection wizard. Calibration can only be started with the EK80 system in either Calibration Normal or Replay mode. 110-0001152/A...
  • Page 76 Kongsberg EK80 User manual for TS calibration Description A dedicated calibration layer is created to isolate the echo from the sphere. Still, several other echoes may be present within the same layer, for example due to fish. In order to detect the sphere correctly, these parameters must be defined to suit its characteristics.
  • Page 77 Not all single targets are located in the centre of the beam. Targets located off centre will offer weaker echoes due to the beam properties. The EK80 system automatically compensates for this using a mathematical model, and you can manually control the effect of this algorithm by defining a maximum gain value.
  • Page 78 In this context, the term channel is used as a common term to identify the combination of transceiver, transducer and operating frequency. Apply to All Layers Check this box to apply the current setting to all the depth layers on your EK80 system. 110-0001152/A...
  • Page 79 Functions and dialog boxes Related dialog boxes Calibration Wizard dialog box #4 (Import Data): Split-beam transducer, page 32 Calibration Wizard dialog box #1, page 25 Related topics Calibration Wizard dialog box #4 (Import Data): Split-beam transducer, page 32 Calibration Wizard dialog box #5 (Process Data): Split-beam transducer, page 48 Calibration Wizard dialog box #4 (Import Data): Single-beam transducer, page 40 110-0001152/A...
  • Page 80 Kongsberg EK80 User manual for TS calibration Index Calibration Wizard dialog box #4 ....48, 59 Replay File dialog box ........68 about Single Target Detection dialog box....73 document downloads ........5 details online information ........5 Add/Edit Sphere dialog box ......71 registered trademarks........
  • Page 81 Index technical support .......... 9 Replay File dialog box description ..........68 Reprocess previous calibration data Calibration Wizard dialog box #1 ..... 26 Kongsberg Maritime support ............. 9 Single Target Detection dialog box description ..........73 software license license information about ............
  • Page 82 Kongsberg EK80 User manual for TS calibration website document downloads ........5 online information ........5 110-0001152/A...
  • Page 84 ©2023 Kongsberg Maritime ISBN N/A...
  • Page 85 Switchboard: +47 815 73 700 KONGSBERG MARITIME Global support 24/7: +47 33 03 24 07 Strandpromenaden 50 E-mail sales: km.sales@km.kongsberg.com P.O.Box111 E-mail support: km.support.science@kongsberg.com...

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