Kongsberg EM 3002 Product Description
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Kongsberg EM 3002 Product Description

Multibeam echo sounder
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Product Description
EM 3002
Multibeam echo sounder

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Summary of Contents for Kongsberg EM 3002

  • Page 1 Product Description EM 3002 Multibeam echo sounder...
  • Page 3 Kongsberg EM 3002 Multibeam echo sounder Product description 855- -164929 / Rev.A...
  • Page 4 The information contained within 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 is not to be communicated to a third party, without the prior written consent of Kongsberg Maritime AS.

  • Page 5: Table Of Contents

    EM 3002 / Base version Table of contents SYSTEM OVERVIEW ........
  • Page 6 Product description Document logistics Date Written Checked Approved 11.03.04 (The original signatures are recorded in the company’s logistic database.) Comments Original issue. 855-164929 / A...

  • Page 7: System Overview

    This allows use on survey launches and subsea vehicles to 1500 m water depth. The EM 3002 system has a very high ping rate of up to 40 Hz, a large number of measurements per ping (up to 254 per sonar head), 1.5°...

  • Page 8: System Characteristics

    EM 3002 / Base version The EM 3002 can be delivered either as a basic multibeam echo sounder instrument for system integration, or as a complete stand-alone seabed mapping system. The Operator Station, a high-performance PC workstation, will always include the necessary operator controls for setting and running the system, data logging, and system testing.
  • Page 9 A single cable with an underwater plug connects the Sonar Head to the EM 3002 Processing Unit. The cable is normally 15 m long, optionally up to 45 m. Existing EM 3000 sonar heads may be used in an EM 3002, but a factory check-up is recommended. Processing Unit The EM 3002 Processing Unit performs the beamforming and bottom detection.
  • Page 10 Serial interfaces: Positioning systems Attitude (roll, pitch and heave) Heading Clock Special interfaces: Trigger input/output Clock synchronization Supply voltage: 115 or 230 Vac 50/60 Hz Sonar Head Second Sonar Head (optional) Figure 1 EM 3002 System overview 855-164929 / A...

  • Page 11: Performance

    Product description 2 PERFORMANCE The operating frequency of the Kongsberg EM 3002 multibeam echo sounder is 300 kHz. This frequency has been chosen carefully to achieve an optimum balance between small dimensions, narrow beams, and good range capability even in turbid waters.
  • Page 12 The following figures show the expected instrumental accuracy of the EM 3002. Note that the total system error will always be higher than the instrumental error of the multibeam echo sounder, because errors in the sensors measuring the vessel’s...
  • Page 13 For a high resolution survey it is recommended that the spacing between neighbouring survey lines for EM 3002 is limited to about 3 times water depth and at least twice that with the EM 3002D. These line spacing recommendations will give an excellent sounding density and also a good swath overlap between neighbouring lines.
  • Page 14 → Refer to figures 4 (page 10), 5 and 6 The performance of the EM 3002 will usually not be affected by suspended particles in the water column (turbidness), which would have been the case if its sonar frequency had been much higher.
  • Page 15 Product description (Cd21512) Figure 3 EM 3002 theoretically calculated accuracy 855-164929 / A...
  • Page 16 EM 3002 / Base version (Cd21513) Figure 4 Calculated EM 3002 Coverage at 20 dB/km 855-164929 / A...
  • Page 17 Product description (Cd21514) Figure 5 Calculated EM 3002 Coverage at 65 dB/km 855-164929 / A...
  • Page 18 EM 3002 / Base version (Cd21515) Figure 6 Calculated EM 3002 Coverage at 135 dB/km 855-164929 / A...

  • Page 19: Installation

    Sonar Head The EM 3002 Sonar Head must be mounted so that it has a clear view of the bottom, i.e. no obstructions are permitted within a sector of minimum ±75° acrosstrack and ± 30° along track with respect to the face of the Sonar Head as seen from the transducers.
  • Page 20 EM 3002 / Base version To lessen risk of damage to the Sonar Head in case of grounding, it may be mounted on the side of the vessel above the keel line. If the keel obstructs the view to one side, the head may be tilted to the opposite side.
  • Page 21 Product description The flat face transducers of the EM 3002 makes the system accuracy less dependent of variations in sound speed at the transducer depth if the Sonar Head is mounted horizontally, and if roll and pitch are not excessive. If the sound speed in the...

  • Page 22: Operation

    EM 3002 / Base version 4 OPERATION System control The control of the Kongsberg EM 3002 is done from the HWS 10 Operator Station using a standard click and point graphical user interface. The software, Seafloor Information System for Real Time Multibeam or SIS-RTM, may either be run under the Microsoft Windows XP or Linux operating systems which are both installed on the HWS 10.
  • Page 23 Product description Figure 8 SIS operator software The grid may also be utilized for real-time data cleaning. Based on a set of user defined rules, outliers in a grid cell, whether from old or new survey lines, are flagged. The flags may be retained or updated through the processing.

  • Page 24: Data Logging

    Water column imagery (CD21516) Figure 9 EM 3002 seabed water column and imagery display Data logging Ensuring logging of all data is of the utmost importance in the system. The data is always stored on disk and the geographical displays take data only from disk so that that what the operator sees is what is safeguarded.

  • Page 25: Post-Processing

    Product description 5 POST-PROCESSING Post-processing options The high quality data produced by the Kongsberg EM 3002 multibeam echo sounder is an excellent basis for producing a complete description of the seabed in the form of charts, 3D displays, combined bathymetry and acoustic imagery, seabed classification, etc.

  • Page 26: Customer Support

    The installation and final testing of an EM 3002 system should be done according to Kongsberg Maritime AS’s documentation. If required, Kongsberg Maritime AS field engineers can be made available to •...

  • Page 27: Femme

    Product description FEMME A forum for users of Kongsberg Maritime AS’s multibeam echo sounder systems (FEMME), with the aim of improving communication both between the users and Kongsberg Maritime AS, but also between the system users, is arranged at approximately 18 months intervals. Close to 100% user participation has been experienced at these meetings.

  • Page 28: Scope Of Supply And Options

    System options available include: • Extra sonar head including additional electronics in the EM 3002 Processing Unit. • Longer cable between the EM 3002 Sonar Head and the Processing Unit (maximum 45 m). • Sonar Head pressure rating increased to 1500 m depth.
  • Page 29 Product description Complimentary to the acoustic instrument system, the following software products may be delivered: • Neptune for post-processing of bathymetric data. • Cfloor integrated with Neptune for digital terrain modelling. • Triton for classifying the seabed sediment types by processing the acoustic response data from the seabed, in combiniation with some local ground-truth information.

  • Page 30: Technical Specifications

    EM 3002 / Base version 8 TECHNICAL SPECIFICATIONS Please note that Kongsberg Maritime AS is engaged in continuous developments of its products and reserves the right to alter the system specifications without prior notice. Overall specifications per Sonar Head Frequency: 293, 300 or 307 kHz...

  • Page 31: Physical Specifications

    Product description • Interface for a 1 PPS (pulse per second) clock sync signal • Ethernet and serial line interface for input of tide and sound speed data and output of all data normally logged to disk. Physical specifications Sonar Head Diameter: 332 mm Height: 119 mm (+27 mm for connector) Weight: 25 kg (15 kg in water)

  • Page 32: Environmental And Emc Specifications

    EM 3002 / Base version Weight: 9.2 kg Power: 115 Vac (60 Hz) and 230 Vac (50 Hz), < 60 W Environmental and EMC specifications The system meets all requirements of the IACS E10 specification. The Operator Station, LCD monitor and Processing Unit are all IP22 rated.
  • Page 33 Product description Sonar Head mounted on a high speed vessel Bow mounted Sonar Head on a small vessel (Cd21517) Figure 10 EM 3002 installation examples 855-164929 / A...

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