iXBlue GAPS Maintenance Manual
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iXBlue GAPS Maintenance Manual

Arm / hydrophone replacement and calibration
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GAPS Maintenance
Arm / Hydrophone Replacement and Calibration
User Guide

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Summary of Contents for iXBlue GAPS

  • Page 1 GAPS Maintenance Arm / Hydrophone Replacement and Calibration User Guide...
  • Page 3 GAPS Maintenance - User Guide Revision History Edition Date Comments 09/2018 Creation 11/2019 iXblue Multilogger, calibration validation criteria 1 MU-GAPSMAINTENANCE-AN-001-B - November 2019...
  • Page 4 In no event shall iXblue be liable for any consequential or incidental damages, including but not limited to loss of business profits or any commercial damages, arising out of the use of this product.
  • Page 5 In order to avail itself of this warranty, Customer must notify iXblue of the defect before expiry of the warranty period and take all steps necessary to enable iXblue to proceed. Customer shall be responsible for the packaging and the shipment of the defective product to the repair center notified by iXblue, the cost of such shipment being borne by Customer.
  • Page 6 User Guide Export Regulation iXblue products and services shall not be exported or re-exported in the following countries (including their territorial waters): Cuba, Iraq, Iran, North Korea, Sudan and Syria. The following export control guidelines shall apply as related to French rules and regulations.
  • Page 7 Part 1: Replacing an Arm This part contains a procedure that explains how to take off one arm from a GAPS unit and to fasten a new arm at the same place. Extracting the hydrophone from the arm is not recommended. End user may buy a complete kit (arm and hydro).
  • Page 8 GAPS Maintenance User Guide Abbreviations and Acronyms GAPS Global Acoustic Positioning System Global Positioning System Inertial Navigation System Real Time Kinematic Signal to Noise Ratio MU-GAPSMAINTENANCE-AN-001-B - November 2019...
  • Page 9 GAPS Maintenance - User Guide Text Usage Bold text is used for items you must select or click in the software. It is Bold also used for the field names used into the dialog box Text in this font denotes text or characters that you should enter from the...

  • Page 10: Table Of Contents

    GAPS Maintenance User Guide Table of Contents EPLACING AN ISMANTLING EASSEMBLING ALIBRATION AFTER EPLACEMENT GAPS ALIBRATING URPOSE OF THE ALIBRATION USBLC ESCRIPTION 2.2.1 Installing USBLCal 2.2.2 Overview of USBLCal 2.2.3 Parameters ALIBRATION ROCEDURE 2.3.1 Mooring Structure 2.3.2 Procedure 2.3.3 Validating a Calibration...

  • Page 11: Replacing An Arm

    GAPS Maintenance - User Guide Replacing an Arm 1.1 Dismantling The following procedure explains how to remove one arm from the GAPS antenna. The required tool is a metric Allen key size 4. Set up the GAPS antenna upside down. Use the Allen key to unscrew the three socket head cap screws CHC M5-12 that fasten the arm to the antenna body.
  • Page 12 Alternately, gently and progressively unscrew and pull on the connector of the hydrophone to the GAPS housing in order to disconnect the connector. You have now removed the arm of GAPS from the GAPS main body. MU-GAPSMAINTENANCE-AN-001-B - November 2019...

  • Page 13: Reassembling

    Glue (e.g. Bostik 1400) Clean and rub with sandpaper the titanium insert of the male part of the connector. Check that the electrical pins are shiny. Contact iXblue if the pins are corroded (not shiny). Grease the two terminations of the connector.
  • Page 14 User Guide Spread some glue on the thread of the three screws. Make sure to install the arm at the correct location on the GAPS housing. Make sure to have the same labels on both items. Perform the screwing manually, do not use any tool. Alternately push and screw the connector to its plug until the pins of the male connector are fully inserted in the female plug.
  • Page 15 3 N.m. The screws are made of titanium and should not be tightened too hard. Start tightening the two screws on the outside and finish by the screw on the inside of the GAPS housing. MU-GAPSMAINTENANCE-AN-001-B - November 2019...

  • Page 16: Calibration After Arm Replacement

    However, the positioning repeatability of GAPS is preserved. See on figures below the amount of bias that may be introduced if no calibration is performed after the replacement of a faulty arm.

  • Page 17: Calibrating Gaps

    Verification of the accuracy (for the considered Signal to Noise Ratio) When GAPS system is calibrated by iXblue a very first time and then a calibration is needed each time a defective hydrophone or defective arm is removed for exchange with a new one.

  • Page 18: Usblcal Description

    2.2.2 USBLC VERVIEW OF USBLCal calculates the nine calibration parameters to be uploaded into GAPS through a configuration file. The main window shown below is made of the areas: ● File: opening of data files, choice of the language and display of the current file ●...

  • Page 19: Parameters

    GAPS Maintenance - User Guide 2.2.3 ARAMETERS The parameters of USBLCal application are: Check box to activate when the input file is made of several Multiple Files small files. File File Count In case of multiple files, the number of files.

  • Page 20: Calibration Procedure

    GAPS Maintenance User Guide 2.3 Calibration Procedure Calibration consists of the following steps: ● Deploying the transponder on a mooring: see section 2.3.1 ● Procedure: see section 2.3.2 > Sailing the first 8-shape navigation pattern and data acquisition > Loading data in USBLCal and computing the offsets that must be residual >...

  • Page 21: Procedure

    8-shape navigation pattern is carried out by following a particular radius of curvature depending on the transponder depth. Water Depth The water depth depends on the accuracy of the GPS that is connected to the GAPS. ● With D-GPS: accuracy is around 1 m, water depth must be 1000 m or greater ●...
  • Page 22 Check the logging directory in the GAPS Web-based User Interface. Align GAPS: ● Switch on GAPS and keep a stable position during at least 5 minutes (alignment). ● Perform 90° or 180° turns every 5 minutes with the vessel and check the heading standard deviation in the navigation page of GAPS Web-based User Interface.
  • Page 23 Start the acoustic tracking only when heading standard deviation < 0.07°. ● When heading standard deviation is below 0.07°, prepare the data logging with iXblue Multilogger provided with GAPS or with a standard hyper-terminal . Log repeater port 8210. Make sure to start logging before starting the tracking. ●...
  • Page 24 Usually, at the end of the first 8-shaped trajectory, the last criteria (repeatability) should not be validated. Click on Save Configuration, store the configuration file CNF_File.xml. For GAPS III, contact iXblue technical support to get the specific procedure. In GAPS Web- based User Interface, open SETUP > SETTING MANAGEMENT . In RESTORE SETTINGS , load the configuration file and click on Restore Settings.
  • Page 25 Second 8-shape trajectory: Log a new file and sail a second 8-shaped trajectory with the calibration data that were just computed. Again, if you are using an hyperterminal or iXblue MultiLogger, make sure to start logging before clicking on Start Tracking.

  • Page 26: Validating A Calibration

    GAPS Maintenance User Guide 2.3.3 ALIDATING A ALIBRATION The next three criteria must be fulfilled to confirm that the calibration is successful. ● Criterion 1: The number of rejected points by the USBLCal (with the area radius) must be below 25 % of the total number of points.

  • Page 27: Ixblue Contact - Support

    GAPS Maintenance - User Guide iXblue CONTACT - SUPPORT For non-URGENT support: ● by email: support@ixblue.com ● using the form on the iXblue web site www.ixblue.com For 24/7 URGENT SUPPORT: ● North America / NORAM +1 617 861 4589 ● Europe Middle-East Africa Latin-America / EMEA-LATAM +33 1 30 08 98 98 ●...

  • Page 28: Appendices

    Removing the Hydrophone This procedure is not recommended without iXblue assistance. The following procedure explains how to remove one hydrophone from an arm of the GAPS. The specific tool (MFC00259) used to push the hydrophone inside the arm is needed: Dismantle the arm from the GAPS antenna.

  • Page 29: B Inserting The Hydrophone In The Arm

    Inserting the Hydrophone in the Arm This procedure is not recommended without iXblue assistance. The following procedure explains how to install a new hydrophone on GAPS. Required tools: ● Three O ring seals (2 large R18, 1 smaller Ø22.5 x Ø3.0) ●...
  • Page 30 GAPS Maintenance User Guide Install the three O-rings (2 groove O-rings and 1 support O-ring). Assembling Grease lightly the inside of the hole in the arm where the hydrophone goes. Thread the cable of the hydrophone inside the dedicated tool until contact between the tool and the hydrophone.
  • Page 31 Install the protective cap on the hydrophone head. Fasten the plastic screw. Do not remove the sticker on the protective cap. The hydrophone is now in position in the arm. The second part of the procedure is the fastening of the arm on the GAPS housing. MU-GAPSMAINTENANCE-AN-001-B - November 2019...

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