Atlas elektronik Atlas north amerca marine sonic sea scan arc... User manual

Sea Scan® ARC Explorer™ Manual

V4.2.1

Doc: 2SFT1-0001

Marine Sonic Technology

[A Brand of ATLAS North America]

ATLAS North America Proprietary

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This product was designed and developed by a teamof engineers at ATLAS North America.

ATLAS North America

120 Newsome Drive Suite H

PO Box 1309

Yorktown, VA 23692-1309

23183-0730

(804) 693-9602

(800) 447-4804

Technical Support

For technical support call (804) 693-9602 or visit our web site at http://www.marinesonic.com.

the copyright laws, neither this manual nor the hardware/software may be copied, in whole or in part,

without the written consent of Marine Sonic Technology, except in the normal use of the software or to

make backup copies. This exception does not allow copies to be made for others.

Trademarks

Sea Scan® is a registered trademark of Marine Sonic Technology.

SHARPS™ is a trademark of Marine Sonic Technology.

Other product or brand names are trademarks or registered trademarks of their respective holders.

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Table of Contents

Section 1 Introduction 4

................................................................................................................................... 41 Advisories

................................................................................................................................... 52Minimium System Requirments

................................................................................................................................... 63Updating Procedures

Section 2 Introduction to Side Scan Sonar 7

................................................................................................................................... 71General Sonar Overview

................................................................................................................................... 72How Side Scan Sonar Works

.......................................................................................................................................................... 9How to Read Sonar Data

Section 3 System Quick Start 12

................................................................................................................................... 121Step by Step

.......................................................................................................................................................... 12System Components

.......................................................................................................................................................... 13Software and Driver Installation

.......................................................................................................................................................... 15Your First Survey

......................................................................................................................................................... 16The Global Position System (GPS)

.......................................................................................................................................................... 16Performing a Rub Check

.......................................................................................................................................................... 17Packing Up ......................................................................................................................................................... 17Software ......................................................................................................................................................... 17Hardware

Section 4 ARC Explorer System Hardware 17

................................................................................................................................... 171Topside Communications Unit (TCU)

.......................................................................................................................................................... 18Front Panel Lights

......................................................................................................................................................... 18Power Button and Lights

.......................................................................................................................................................... 19Connections to the TCU

......................................................................................................................................................... 19Power ......................................................................................................................................................... 20Tow Cable......................................................................................................................................................... 20Ethernet .......................................................................................................................................................... 21Connection to a PC

......................................................................................................................................................... 21Ethernet ......................................................................................................................................................... 21USB ......................................................................................................................................................... 21Accessory

................................................................................................................................... 212 Towfish

......................................................................................................................................................... 21Tail Assembly Removal

.......................................................................................................................................................... 22Towcable Connector

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.......................................................................................................................................................... 22Variable-Angle Towrail

......................................................................................................................................................... 23Adjustment Procedure

......................................................................................................................................................... 24Zeroing Procedure

................................................................................................................................... 28Tools ................................................................................................................................... 28Factory Tow Rail Removal

................................................................................................................................... 30Installing the Depressor

................................................................................................................................... 33Depressor Adjustment

................................................................................................................................... 34Depressor Removal

......................................................................................................................................... 35Depressor Operation

......................................................................................................................................................... 40Auxiliary Interface Ports

......................................................................................................................................... 40Hardware Identification

......................................................................................................................................... 42Removing the Auxiliary Port Cover

......................................................................................................................................... 44Depth Sensor and Altimeter

................................................................................................................................... 46Software Operation

.......................................................................................................................................................... 48Towing Characteristics

......................................................................................................................................................... 48Standard Tow Fish Towing Characteristics

......................................................................................................................................................... 49Keel Weight Towing Characteristics

................................................................................................................................... 503Maintenance, Lay-up and Care

Section 5 Troubleshooting 50

................................................................................................................................... 541 Multimeter

.......................................................................................................................................................... 54How to Check Fuses

.......................................................................................................................................................... 54How to Check Battery Voltage

.......................................................................................................................................................... 54How to Check for Broken Connections

Section 6 Revision History 56

Section 7 Glossary 56

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1 Introduction

Marine Sonic Technology is a well-established and highly-respected resource for individuals and

organizations that perform search and recoveries; bottom surveys; ship hull inspections; port and

homeland security; bridge, pier, pipeline, and harbor inspections; vertical structure imaging; and

environmental surveys and research. Our sophisticated computer-based side-scan sonar systems

effectively provide real-time, detailed, and accurate underwater imaging.

Integral to our success, and to the Sea Scan®ARC (Adaptive Resolution Chirp) Explorer™ towed

system, is Sea Scan®Survey, our premier software package providing exciting features that make

collection and review of sonar data easy and highly efficient. The software features an integrated

waterfall display designed to maximize the effective computer screen viewing area. The waterfall

display has a complete tool set that allows range, length, height, and area measurements, all of

which can be executed in real time or during post-processing operations.

In addition to measurement tools, Sea Scan®Survey software provides an adjustable magnification

zoom tool and a target marking tool. Added features include an advanced target marking system

for instant access to any real-time marking point during either the on-water or post-processing

operation. Other windows are available during data collection and post processing that allow

additional data perspectives. These include an A-Mode view of the sonar data, a data status

window that shows range delay, ping rate, Speed over Ground (SOG), Course over Ground (COG),

heading, Latitude/Longitude (L/L), and depth at a glance. The software includes a full feature

navigation plotter to show swath coverage, marked targets, and vector chart maps. Sea Scan®

Survey also has an advanced graphical user interface that provides a variety of ways to maximum

usage of the computer display.

The ARC Explorer features the latest, proprietary technology, Adaptive Chirp. This high-tech design

extends ranges up to 50% further, minimizes power consumption, and is more accurate and

informative. With its modular, anodized-billet aluminum housing, stainless steel integrated brackets,

and durable polymer attachments, the Sea Scan®ARC Explorer towfish features a built-in variable-

angle tow point for ultimate flexibility and field-replaceable transducers.

TIP: Underlined words are defined in the Glossary.

TIP: Cautions, notate any action that could damage equipment or cause a loss of data

TIP: Warnings, draw attention to anything that could result in injury or death to the operator

1.1 Advisories

CAUTION: Turn off power before disconnecting any component. Disconnecting the components

without turning off the power may cause a sudden pulse of current or voltage that can damage the

internal components.

CAUTION: Electrostatic-sensitive devices can be damaged by excessive levels of voltage and/or

current. To protect these devices, bring the device and everything that comes in contact with it to

ground potential by providing a conductive surface and discharge paths.

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THE SEA SCAN®TOWFISH IS BUILT FOR A MARINE ENVIRONMENT, BUT SOME COMPONENTS

ARE SENSITIVE TO MOISTURE AND CORROSION. THEREFORE, THE FOLLOWING PRECAUTIONS

MUST BE FOLLOWED:

·NEVER attach the connectors when the power is on.

·Ensure that the connectors are CLEAN AND DRY before they are mated to one another.

·When finished for the day, rinse the system with clean, fresh water.

1.2 Minimium System Requirments

Sea Scan Survey requires the following capabilities.

Operating System

Windows XP, Vista, 7, 8, 8.1, or 10

Hard drive space

100 MB base + 2.5 GB charts + data storage

Available RAM

1 GB minimum;

2 GB recommended

Processor Speed

1.8 GHz or better

Other Features

Ethernet & USB 2.0 port

Screen Resolution

1024 x 768 minimum or higher

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1.3 Updating Procedures

Marine Sonic Technology engineers continually review and improve upon the company’s hardware,

firmware, and software procedures and capabilities. Revisions and updates may be frequent and

can significantly streamline operation. Contact Marine Sonic Technology Customer Service to

inquire about updates, patches, and notices or visit the Marine Sonic Technology website at

www.marinesonic.com.

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2Introduction to Side Scan Sonar

2.1 General Sonar Overview

Sonar is a coined word derived from the phrase, Sound Navigation And Ranging. Sonar generally

refers to a system that uses acoustical (sound) energy transmitted through water. At the heart of

that system is the transducer, the device that converts electrical energy to sound and vice versa

and is responsible for generating the sound pulse. A receiving transducer is used to receive the

echo that “bounces” off objects encountered along its path

Figure 1: The transducer sends out a pulse

Figure 2: The pulse bounces off the object

Thus, sonar is a system that determines the position of unseen underwater objects by transmitting

sound waves and measuring the time it takes for their echo to return after hitting the object.

2.2 How Side Scan Sonar Works

Because of their flexibility, side-scan systems can be used in many applications , some of which

involve highly sophisticated remotely operated vehicles (ROVs), autonomous underwater vehicles

(AUVs) or a towed system. The most common side-scan systems are towed behind a surface

vessel and comprise three elements: the control unit containing the software, the towfish with

transducers mounted on each side, and the cable that connects the towfish to the surface vessel

that follows a track or course through the water. The images they create can be used for many

applications such as geologic studies, locating sunken objects, ensuring that the waterway is clear

and safe for shipping, and many more.

The transducer assembly moves on a steady course and at a constant depth through the water. As

it is moves through the water, the assembly emits sound pulses at precise and regulated intervals.

Figure 3: The system emits precise sound pulses

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The system receives the returning echoes from the water column and seafloor shortly after emitting

a pulse.

Figure 4: The system picks up the returning echoes

Sea Scan Survey listens for a short amount of time, which is determined by the range; then it pings

again, thus beginning a new cycle.The returning echoes from one pulse are displayed on the sonar

window or waterfall as one single line, with dark and light portions of that line representing strong or

weak echoes relative to time. The stronger the sonar’s returning signal, the brighter the mark that

appears on the sonar window. The resulting accumulated lines then form a coherent picture of the

seafloor.

The two transducers provide information unique to their particular side of the system platform.

Figure 5: The transducers return info about their side of the system

In between the transducer beams is the system’s track immediately below the towfish. That center

display or water column loosely relates to the platform’s track. It communicates details about

objects encountered before the first bottom return and can include things such as surface returns,

debris, fish, and objects protruding from the sea floor.

The operator can view wide tracts of the seafloor because the transducers ping along the swath

width and the software records the strength of the echoes from the sea bottom. The system is

positioned just above the seafloor bottom. The transducers continuously emit narrowly focused

beams of sound perpendicular to the path of motion. The sound pulses pass through the water but

are reflected from the seafloor and objects, such as wreck sites that sit on the seafloor. The

computer records the echo signal strengths as they return and draws the entire sonar record line on

the screen. Thus, an image is built, line by line, as the sonar record line from each ping returns and

is drawn on the screen.

The quality of the sonar data will depend on operator and the data-gathering process, which

involves vessel course, tow speed, system altitude above the bottom, sea conditions, and range

settings. For example, a higher range setting yields a larger data sample with more of the seafloor

displayed; but the data will not have as high a resolution.

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2.2.1 How to Read Sonar Data

2.2.1.1 Sonar Beam

Vertical Beam Angle

How wide the beam angle is; it is measured from the sea bottom to the top of the sound that was

projected from the transducer.

Figure 6: The vertical beam angle

Horizontal Beam Width

The width of the sound wave determines the expanse of the area covered horizontally, and the

speed of the boat determines the ping spacing. The slower the vessel moves, the more overlapping

coverage that will be obtained. This approach yields more data for a higher quality image.

Figure 7: The horizontal beam width

2.2.1.2 Surface and Bottom Returns

Two distinct returns should be noted.

Figure 8: Surface and bottom returns in the waterfall

First Bottom Return: This is the initial data from the point where the sound meets the seabed.

First Surface Return: This is the first data from the point where the meets the water's surface. As

in the picture, this is usually a wavy, sparse, non-solid return, which appears mainly in shallow

scanning situations. In deeper water, the sound beam will not reach the surface.

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2.2.1.3 Prop Wash

Prop Wash shows in the waterfall when the churning waves and air bubbles produced by the ship's

propellers are picked up in the transducer's beam.

Figure 9: The effects of prop wash

This problem occurs mainly when a towed system is in shallow water. In deeper water, the

transducer's beam should be out of the propeller's wash, and the picture quality will improve. A

shallow-water solution to this problem is to tow the system ahead of the propeller from either the

front or sides of the ship.

2.2.1.4 Shadows

Shadows are produced when the sound waves transmitted from the sonar don't bounce off anything,

so there's no signal to return to the transducer.

Figure 10: A rock viewed from directly above

Depth sounders bounce their signals straight down, so the rock in this image is viewed only from the

top down.

However, just as the sun reveals shadows, sonar shadows are produced by the absence of sound.

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Figure 11: When viewed from an angle, the rocks produce shadows

In Figure 11 left, the shadow area has nothing there to return a sound. Thus a shadow is created.

Just as with a sun-created shadow, the height of an object determines the length of the shadow.

Figure 12: A sonar shadow

This shadow example in In Figure 12 is an image of a bridge pylon. In this image you can see the

large base as a rounded corner rectangle. In the center is the pillar. The shadow shows that the

base of the pylon's height can be measured. The center pillar goes up out of the water, thus the

shadow extends to the end of the sonar's range.

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3System Quick Start

3.1 Step by Step

This is a Quick-Start guide for our Sea Scan®ARC Explorer system. This guide is for users who

want to get started quickly or for those who have operated the system previously but need a quick

refresher. For more detailed system information, please refer to the other parts of this manual.

Figure 13: ARC Explorer System

3.1.1 System Components

Verify that you have all of the following system components:

·Windows XP, 7, or 8, 10 based PC

·Topside Communications Unit (TCU)

·All four Back Fins

·Power Cable

·Power Source

·Tow Cable

·Towfish with Transducers

·USB Cable

·Network Cable (connects PC to TCU)

·USB Global Positioning System (GPS)

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3.1.2 Software and Driver Installation

Sea Scan ARC Explorer is a self-contained side-scan sonar system. The software controls the

collection of the sonar imagery and navigational input and displays the information on the computer

screen. It allows you to control the sonar data collection process, review, analyze, and save the

sonar image along with the markers and waypoints. The towfish ping rate and sonar signal

processing also are controlled by the software, and the software automatically communicates with

the towfish to determine status and configuration.

The following is a step-by-step description for setting up the Sea Scan ARC Explorer system on a

survey vessel and running an operation:

1. Insert the included flash drive into your computer.

2. Select Open Files in a Folder. If Windows doesn't offer you options for opening, use Windows

Explorer to find the Flash Drive.

3. Locate the Sea Scan ARC Explorer Towed System software folder and select the "Install Sea

Scan Survey Basic.exe".

4. You will be asked where to install the software; the default folders should be fine for most users.

5. You will be asked to install Drivers and Charts. Select "Yes" and install them accordingly.

CAUTION: Do not connect any devices before installing the software, as they will slow the

installation process.

3.1.3 Towfish Setup

CAUTION: Do not plug or unplug the towcable if TCU power is ON!

·Verify that the Topside Communications Unit (TCU) power is off!

·Verify that the wet-mate connector is clean and plug it in.

TIP: Occasionally clean out the connector with a silicone-based spray (a bottle comes with the

system's kit).

·Verify that the fins are correctly installed and that the locking bolt is tight.

·Plug the tow cable into the TCU.

·Plug the tow cable into the towfish connector.

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Figure 14: Towcable Rigged to Towrail & Breakaway

Figure 15: Towcable Connected to sonar

3.1.4 Topside Communications Unit (TCU)

Figure 16: Topside Communications Unit

·Plug the TCU into the computer using the provided Network cable.

·Connect the power cable to the power source.

CAUTION: Do not plut of unplug the towcable if the TCU power is ON!

·Plug the power cable into the TCU.

·Power on the TCU by pressing the power button.

·Wait for the TCU's green network LED to turn on.

·Wait for the PC network to configure. This should be less than 30 seconds on Windows 8, 7, and

Vista. On Windows XP it may take over 1 minute. The network icon in the taskbar notification

area will indicate the network status.

Windows 7, 8, 10

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Not Connected

Connected

·Open “Sea Scan Survey,” turn on the TCU, and follow steps a to d to verify that it shows in the

software’s sonar Interface Manager:

a. Right click on the waterfall (the black area in the middle of the computer screen).

b. Click <Sonar Interface> on the pop-up menu.

c. Select <ARC Explorer>, select “Start,” click it.

d. At the bottom right, the sonar Status should change from red to yellow, then green, and read

“SONAR Connected.”

TIP: If the sonar status remains red, please refer to troubleshooting reference

at the end of this manual.

If the sonar status remains red, please refer to the Quick Troubleshooting Reference at the end of

this manual or to the “Sea Scan® Survey” software manual on the installation disk before you

proceed!

3.1.5 Your First Survey

·Click on <File> at the top-left of “Sea Scan Survey.”

·Select <New> from the drop-down menu. This will open the New Survey window.

Figure 17: Creating a New Survey

·In the box “Enter Name for,” type the name of the survey.

TIP: Make the name meaningful so that it can be easily found later.

·Add a description of the survey.

·Click the <OK> button at the top right of the <Begin a New Survey> window.

CAUTION: The survey is now created, but you must turn the sonar ON by performing the following

steps to begin collecting data.

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·Move the mouse cursor over the <Sonar Control Window> tab on the left side of the “Sea Scan

Survey” software.

·If using a dual-frequency sonar, verify that the correct frequency is selected. Keep in mind,

however, that higher frequencies have higher resolution but less range, and lower frequencies

have lower resolution but more range.

·Under "Sonar Power," click the <On> button to begin collecting data.

Figure 18: SONAR Power ON

3.1.5.1 The Global Position System (GPS)

·Plug the GPS into the computer.

·in "Sea Scan Survey," click <Tools>, click <Settings>, select <Navigation and Fathometer> and

then select <NMEA Data Input> from the list that appears in the pop-up menu.

·Under Available Ports, click the port to which your GPS is connected.

·Click the <Add> button; then click <OK>.

3.1.6 Performing a Rub Check

Perform a Rub Check by rubbing your hand along the transducers to verify that Sea Scan Survey

shows a narrow strike across the left and right sides of the waterfall display, respectfully, as shown

in the following picture.

Rub Check Performed

TIP: Use dry fingers, a crumpled piece of paper, or (preferred method) a burst of compressed air for

more effective rub checks.

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TIP: If you have a dual-frequency towfish, the rub check must be done separately for each

frequency.

3.1.7 Packing Up

3.1.7.1 Software

·In Sea Scan Survey, open the sonar Control Window and turn the power <Off>.

·You can close the software at this point. This action will close the survey, which will be stored on

your computer’s hard drive in the "My Sonar Data" folder.

3.1.7.2 Hardware

CAUTION: Turn off the TCU BEFORE unplugging the towfish! Failure to do so can result in a

damaged towfish or TCU!

·Disconnect the power cable from the power source and then from the TCU.

·Disconnect the tow cable from the towfish.

CAUTION: Verify that the connectors are dry. If water is inside the connector, a quick blow of air

from either a can of compressed air or a spray of WD-40™ should be sufficient to avoid corrosion.

·Disconnect the towfish cable from the TCU.

·Disconnect the Ethernet cable from the TCU and then the computer.

·Put on any connector covers on the ends of the system cables.

·Be sure to rinse anything that came in contact with salt water with clean fresh water before storing

the system.

4ARC Explorer System Hardware

4.1 Topside Communications Unit (TCU)

Marine Sonic Technology has designed the Topside Communications Unit (TCU) for ease of use.

The unit housing is sealed and made of rugged plastic. All connectors are water resistant.

Indicator lights are on the front of the unit to indicate power to the unit, communication with the

network, and communication with the towfish. Internal circuit boards seamlessly communicate with

all attached components, and an internal power supply provides the voltage for the towfish.

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Figure 19: Topside Communications Unit (TCU)

CAUTION: Do not plug or unplug the tow cable if the power is on to the topside communication

unit.

TIP: Make sure the connector's O-Rings are in their proper place and that they are free of debris

and dirt. If you happen to lose an O-Ring, extra ones come with the system, including in the

connector's cap.

4.1.1 Front Panel Lights

4.1.1.1 Power Button and Lights

Figure 20: Topside Communications Unit (TCU) Front View Lights

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Power

Button

No Light

The power is off.

Dim Blue

CPU is booting; if it stays dimmed, the TCU power is on, but the TCU's

processor is not starting. Even if the TCU is turned off, it still draws power.

Bright Blue

Power is on.

Network

Status

Off

The network configuration has Not Completed. Possibly the Ethernet connector

isn't connected properly.

Blinking

It has a connection and is communicating with it.

Solid

It is waiting for a connection.

Activity

Off

No activity has been detected.

Blinking

It is actively communicating.

4.1.2 Connections to the TCU

4.1.2.1 Power

Figure 21: Topside Communications Unit (TCU) Left View

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