Kongsberg ME70 Instruction Manual
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Kongsberg ME70 Instruction Manual

Kongsberg ME70 Instruction Manual

Scientific multibeam echo sounder calibration
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Instruction manual
ME70 Calibration
Scientific Multibeam Echo sounder
kongsberg.com/me70
110-0090890/A

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  • Page 1 Instruction manual ME70 Calibration Scientific Multibeam Echo sounder kongsberg.com/me70 110-0090890/A...
  • Page 3 On-line help. Caution You must never turn on the ME70 system when the ship is in dry dock. The transducer can be damaged if it transmits in the open air. Additional end-user documents related to the ME70 system can be found on our website.
  • Page 4 The information contained in this document remains the sole property of Kongsberg Discovery 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 Discovery 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

    Calibration for target strength measurements ................. 7 Calibration procedures ......................9 Preparing the ME70 for calibration................9 Preparing the vessel for ME70 calibration ..............11 Calibration procedure using a single sphere..............12 Calibration procedure using multiple spheres ............. 14 Merging calibration data....................15 Showing calibration gain adjustments difference............
  • Page 6 Kongsberg ME70 About dialog box ......................39 Beam Mode Calibration Settings dialog box .............. 39 110-0090890/A...

  • Page 7: About This Manual

    About this manual About this manual This publication provides you with the basic information required to calibrate the ME70 system. Relevant products This publication provides you with the basic information required to calibrate the ME70 system. The publication is valid for the following products: •...
  • Page 8 Kongsberg ME70 User manual for calibration ® 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. We also want our end-user documentation to be comprehensive and relevant.

  • Page 9: Calibrating The Me70

    Calibration views, page 21 Calibration functions and dialog boxes, page 30 Calibration for target strength measurements Calibrating the ME70 system for velocity measurements ensures that the accuracy is maintained. In order to calibrate the ME70, a reference target (calibration sphere) with known target strength (TS) is lowered into the all beams.
  • Page 10 Each beam mode to be used in a survey must be calibrated separately. For each beam, new estimates for adjusting gain and correction must be calculated using the target strength data and the reference sphere values. Any adjustments to the ME70 system files are done automatically. 110-0090890/A...

  • Page 11: Calibration Procedures

    Preparing the ME70 for calibration Prior to calibration, you must check that your ME70 is fully functional. Context A fully functional ME70 system is vital for a successful calibration. It is necessary to measure the environmental conditions before the calibration starts. Procedure Start the ME70 program.
  • Page 12 Kongsberg ME70 User manual for calibration Note When you calculate the TS, you must use the sound velocity at the depth of the sphere. Sound absorption for different salinity values Related topics Calibration procedures, page 9 110-0090890/A...

  • Page 13: Preparing The Vessel For Me70 Calibration

    Calibrating the ME70 Preparing the vessel for ME70 calibration Prior to calibration, a suitable geographical location must be found. The necessary equipment for lowering, hoisting and handling the target sphere must be set up. The rigging description is to a great extent reproduced from ICES report 326.

  • Page 14: Calibration Procedure Using A Single Sphere

    ME70 performance.This results in poor and not reliable calibration accuracy.
  • Page 15 This is not a necessary if all the beams are already defined as split beams. Activate the mode. Start pinging and start recording. 10 Check that the sphere is visible on the ME70 display. 11 On the menu, select Setup...

  • Page 16: Calibration Procedure Using Multiple Spheres

    This procedure explains how to do a calibration using multiple sized spheres for different frequencies to cover the frequency range of the system. Context Two spheres can be used for calibrating the ME70. Note It is important that calibration with each sphere is done with nominal performance. In the calibration program you will only see hits for the beams with frequency inside the range covered by the selected sphere.

  • Page 17: Merging Calibration Data

    Calibrating the ME70 Related topics Calibration procedures, page 9 Merging calibration data This procedure explains how to merge data from two separate calibrations using calibration spheres for different frequencies. Prerequisites Calibration data set for two calibrations of the same Beam Mode but with different calibration spheres must be available.

  • Page 18: Showing Calibration Gain Adjustments Difference

    Kongsberg ME70 User manual for calibration Related topics Calibration procedures, page 9 Showing calibration gain adjustments difference This procedure explains how to calculate and display gain adjustment difference between two separate calibrations. Prerequisites Calibration data set for two calibrations of the same beam mode must be available Context The calibration procedure will result in adjusting a set of coefficients.

  • Page 19: Showing Calibration Gain Adjustments

    Calibrating the ME70 Showing calibration gain adjustments This procedure is used to display the gain adjustment being calculated for each beam Prerequisites A calibration must have been completed and stored. Context The calibration procedure will result in adjusting a set of coefficients. These coefficients are in turn used when processing target strength data in order to get a correct and as optimum result from surveys as possible.

  • Page 20: Edit Previously Recorded Calibration Data

    – if necessary – make changes to the target strength data. Adjusting previously recorded calibration data, involves suspending or activating chosen hits. If you do this on the ME70 Processor Unit, you can save the data and update the relevant beam mode immediately.

  • Page 21: Suspending Target Strength Data For Individual Hits

    Calibrating the ME70 Suspending target strength data for individual hits This procedure explains how to delete target strength data “hits” that are in obvious error. In list, you can suspend individual echoes from the calibration processing. TS Data Prerequisites Collecting calibration data must be an ongoing process or recorded previously.

  • Page 22: Input Of Calibration Sphere Characteristics

    Calibration procedures, page 9 Input of calibration sphere characteristics Kongsberg Discovery can supply a variety of calibration spheres dedicated for different operational frequencies. Each sphere diameter is selected for minimum temperature dependence. Spheres with diameter 25, 75 and 84 mm are available.

  • Page 23: Calibration Views

    Calibrating the ME70 </TargetReference> Calibration views The different views provided display the relevant information to monitor the calibration of the selected beam mode. The best quality of the calibration will rely on several target strength detections for each beam. The layout of the beams for a selected beam mode is shown in a dedicated view.

  • Page 24: Selected Beam View

    Numerical View in the ME70, beam data, target strength data and results from the calibration. All information is represented in numerical manner. Observe the other information fields adapt to the newly selected echo (target).
  • Page 25 Calibrating the ME70 Target Position Target Strength Compensation Target depth representation Description information field provides Selected beam yet another way to further investigate the target strength. Click anywhere in the Selected information field on the left side and beam a projection will be defined. This projection...

  • Page 26: Beam List

    Kongsberg ME70 User manual for calibration Target depth representation The right side of the field shows the calibration layer that is automatically created once the calibration starts. The representation shows the vertical position of the target for the current ping. It is shown as a red filled circle along a vertical axis.

  • Page 27: Beam Mode

    Calibrating the ME70 Description Each beam is dedicated a line in the list. To identify each beam the beam number, the operating frequency and the beam angle in x and y direction are parameters displayed in this field. To get detailed information about a specific beam, click on the beam in Beam List view.

  • Page 28: Numerical View

    Numerical View the ME70, beam data, target strength data and results from the calibration. All information is represented in numerical manner. The numerical information is presented in different tabs, grouping values which have a connection for clarity.
  • Page 29 Calibrating the ME70 General page page shows the common data and parameters for the system used during General calibration. • Calibration: System information • Transceiver parameters common to all beams • Reference target and common limits in depth and deviation •...
  • Page 30 Kongsberg ME70 User manual for calibration TS-Data page page displays the numerical parameters related to each individual echo. Target TS-Data strength data is collected for each beam individually. Each row represents a a target strength detection and the hit number for selected beam. The target strength data presented in rows are: •...
  • Page 31 Calibrating the ME70 Results page This tab shows a summary of the calibration results for all beams. The calculation of these parameters is made for each ping. Each row represents a beam and consist the following information: • : The identification of the beam.

  • Page 32: Calibration Functions And Dialog Boxes

    Kongsberg ME70 User manual for calibration Calibration functions and dialog boxes Topics Menu system, page 30 File menu, page 31 View Menu, page 31 Start/Stop Menu, page 32 Help menu, page 32 Single Target Detection dialog box, page 33 Save As Dialog Box, page 35...

  • Page 33: File Menu

    Calibrating the ME70 File menu menu for calibration provides functions for setting parameters, managing files and File reports and exit the program. Calibration How to open Select in the menu bar in the program to open the menu. File Calibration Description •...

  • Page 34: Start/Stop Menu

    Kongsberg ME70 User manual for calibration Description • TS Hits function will place the TS (target strength) hits in the TS Hits Beam mode Selected information fields. beam • Gain Adjustment Plot function allows you to view the calculated gain adjustments...

  • Page 35: Single Target Detection Dialog Box

    Calibrating the ME70 Single Target Detection dialog box parameters are used to control the operational settings for the Single Target Detection detection of single targets. In order to detect single fish correctly, these parameters must be defined to suit the target characteristics. The chosen settings do not have any effect on the raw data you save during the survey.
  • Page 36 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 ME70 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 37: Save As Dialog Box

    Calibrating the ME70 The distance is defined as a relation to the length of the transmitted signal. Selecting 1 means that the minimum spacing corresponds to the physical distance covered by the transmit pulse. Increasing the value will require the targets to be further separated, but can improve the accuracy of the target strength values.

  • Page 38: Setup Dialog Box

    Kongsberg ME70 User manual for calibration Details Name Type the chosen name for the calibration data. Description Type a description of the calibration data. Related topics Calibration functions and dialog boxes, page 30 Setup dialog box dialog box allows you to define the main parameters for the calibration.

  • Page 39: Show Reports Function

    Calibrating the ME70 Related topics Calibration functions and dialog boxes, page 30 Show Reports function enables you to open and read previously generated calibration reports. Show Reports How to open function is opened by selecting on the menu in the...

  • Page 40: Replay Xml Function

    Kongsberg ME70 User manual for calibration Replay XML function function enables you to open and edit previously saved calibration files. Replay XML Description function is opened by selecting on the menu in the Replay XML Replay XML File program. Editing the calibration data can either be done during calibration, this...

  • Page 41: Start/Stop Function

    About Help Calibration Description The ME70 Calibration program is released with a specific software version. The About dialog box displays the current version number of the program. The Calibration Calibration program has a separate software version from the ME70 software.
  • Page 42 The dialog box offers three pages that allow you to take different calibration-related actions. Select page allows you to select the calibration you want to use in your ME70 Select system. The currently active calibration mode is highlighted when you open the page.
  • Page 43 Calibrating the ME70 Note When you select or close the dialog with the button, your recently highlighted Apply calibration mode on the page becomes the active mode. Each calibration mode Select is accompanied by a description. Related topics Calibration functions and dialog boxes, page 30...
  • Page 44 Kongsberg ME70 User manual for calibration Index about Exit document downloads ........5 calibration..........37 online information ........5 description ..........37 registered trademarks........5 function............ 37 software license ........... 5 software version........... 5 target audience ..........5 this publication ..........5...
  • Page 45 Index Numerical View information field Replay XML descriptions..........26 description ..........38 Numerical Viewl information field purpose..26 function............ 38 Selected beam ..........22 Save As dialog box license information description ..........35 software ............ 5 details............36 logo Selected beam registered trademark........
  • Page 46 Kongsberg ME70 User manual for calibration website document downloads ........5 online information ........5 110-0090890/A...
  • Page 48 ©2024 Kongsberg Discovery ISBN N/A...

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