Odom ECHOSCAN Manuale utente

04/26/02 1 Revision 1.11

TABLE OF CONTENTS

INTRODUCTION............................................................................... 2

General .............................................................................................................2

Specifications ....................................................................................................4

INSTALLATION................................................................................ 5

System Components .........................................................................................5

Power Supply Considerations ...........................................................................6

Transducer Installation ......................................................................................7

SPU Connections..............................................................................................9

CONTROLS AND INDICATORS .................................................... 11

SPU.................................................................................................................11

LCDU ..............................................................................................................11

Startup Screen ................................................................................................12

File ..................................................................................................................13

Display ............................................................................................................13

Setup...............................................................................................................14

Gain.................................................................................................................15

Digitizer Settings .............................................................................................16

Help.................................................................................................................16

Control Panel...................................................................................................17

OPERATION................................................................................... 20

Power-Up Procedure.......................................................................................20

Example Survey System Configuration ...........................................................21

HYPACK......................................................................................................21

ECHOSCAN Setup ......................................................................................21

HYSWEEP...................................................................................................25

Non-Standard System Configurations.............................................................26

COMMUNICATION CPU - Dip Switch Settings ............................ 29

MULTIBEAM CALIBRATION ......................................................... 31

Bar Check .......................................................................................................31

Referencing to a Single Beam Echo Sounder .................................................31

Combined Velocimeter and Single Beam Calibration......................................31

Flux Gate Compass Alignment........................................................................33

COMPUTER INTERFACE .............................................................. 34

Serial Output Strings .......................................................................................34

ECHOSCAN Output Simulators ......................................................................35

Side Scan Recorder / Processor Interfacing ...................................................36

EXTENDER CABLE WIRING ......................................................... 38

TRANSDUCER CABLES................................................................ 39

JUNCTION BOX WIRING............................................................... 42

HEADING SENSOR WIRING ......................................................... 44

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INTRODUCTION

ECHOSCAN is a 200 kHz multibeam echo sounder employing physical

beamforming techniques to shape and steer 30 beams over a 90° coverage

sector. There are three major components in the ECHOSCAN system; the

Transducer, the Signal Processing Unit (SPU), and the Laptop Control / Display

Unit (LCDU).

General

The piezoelectric material used in the transducer design is PVDF

(PolyVinyliDene Fluoride). Each receiver has a sensitivity of -197 db (re 1

V/µPa) with sidelobes suppressed to greater than -30 db. The transducer

is hydrodynamic in shape to allow for minimum drag at high survey

speeds (in excess of 13 knots) without flow noise or cavitation. 30

independent beams fan out from the transducer to cover a swath equal to

twice the water depth. The transducer is positively buoyant for easy

recovery should it impact with floating debris. Provisions for housing

motion sensors and side scan elements are built right into the fairing.

Also built into every ECHOSCAN transducer is a separate, single beam

receiver that is used with a standard survey echo sounder, such as the

Odom ECHOTRAC, for shallow water applications or to provide a hard

copy of the vertical profile. This “reference” transducer is also used to

assist in calibration of the multibeam and provides a “hard copy” of the

traditional “bar check”.

ECHOSCAN will produce sounding densities ranging from 1 sounding

every 13 square meters to 7.5 soundings per square meter depending on

Figure 1

ECHOSCAN Transducer

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selected Range Scale. Tilt angles up to 45° port or starboard are possible

for surveying structures such as breakwaters and dams. If the optional

motion sensor is installed, the tilt angle is sensed to within .05° and

automatically compensated.

Side Scan elements, mounted

along the bottom edge, are

included in every ECHOSCAN

transducer. Backscatter

imagery from the common 2.5°

PZT projector is received by the

two, 0.7° side scan receivers to

form a uniform, high resolution

beam pattern over the entire

swath.

The SPU contains 11 signal

processors, each independently

tracking and digitizing bottom

echo signals. The additional

board process side scan

backscatter imagery. All 11

boards are identical and

interchangeable (See Technical

Manual for details).

Real time data quality

verification is provided in the

form of a 3D display program

running on the LCDU. The

operator is presented with both

profile and trend information

and can access the gain and

power settings. The operator

also controls the number of

historical scan lines shown in

the 3D presentation. Both

bathymetry and side scan gain

and TVG settings are accessed

through the LCDU.

Other real-time control / display functions are described in section 3. The

“C” language program running on the LCDU may be ported over and

executed under the user’s operating system.

Figure 2

Signal Processing Unit (SPU)

Figure 3

Laptop Control/Display Unit

(LCDU)

Pull

Down

Menus

Data

Display

Control

Panel

04/26/02 4 Revision 1.11

Specifications

Technical Specifications for the Odom ECHOSCAN Multibeam are as

follows:

• Acoustic Frequency ………………... 200 kHz

• Number of Beams ………………….. 30 (physically beam formed)

• Transducer Receive Elements …… PVDF

• Projector Configuration ……………. PZT, 256 element, curvilinear array

• Beam Pattern ……………………….. 3° at 3db Points (elliptical)

• Coverage Sector ……………………. 90°

• Acoustic Working Depth Range ...... 2-100 Meters (guaranteed), 2-200

Meters (theoretical)

• Output Update Rate ……………….. Depth Dependent (13/sec at 20 m

range)

• Output Resolution ……………….... 2.5 cm

• Roll / Pitch Accuracy ………………. 0.05° (w/ optional ODMS-05 sensor)

• Maximum Tilt Angle ……………….. 45° (self-calibrating w/ ODMS-05

sensor)

• Sidelobe Suppression .................... > -30db Per Channel

• Sensitivity................................…..... -197 db re 1 V/µ Pa

• Source Level ............................….... 225 db re 1 µPa at 1 Meter

• Preamp Noise ……………………… < 3db

• Ref. Transducer Beam Width .…… 9° at 3db Points

• Side Scan Imagery ………………… High Resolution, Analog

• Side Scan Beam Pattern ................ 110° x 0.7°

• Real-Time Data Presentation ……. 3D Perspective, profile “waterfall”

• Max Survey Speed ………………… Between 12 & 17 Knots (hull and mount

design dependent)

• Power Requirement .................…... 110/230 VAC, 50/60 Hz Optional 24

VDC, 75W

• Dimensions:

SPU ............................... 48.3 (w) x 26.7 (h) x 24.2 (d) cm.

Transducer ..................... 38.1 (w) x 26.1 (h) x 125.5 (d) cm.

• Weight:

SPU ......................…....... 13.6 kg.

Transducer ..................... 40.8 kg. (positively buoyant in water)

04/26/02 5 Revision 1.11

INSTALLATION

In addition to the primary components of the Odom ECHOSCAN (the SPU,

LCDU, and the Transducer), a full complement multibeam system requires, a

heading sensor (compass), a positioning system (normally a GPS receiver), and

a ship’s motion sensor. For ease of inter cabling, Odom supplies a Junction Box

(See Figure 4) to route signals to various units and sensors. For Example: The

ODMS-05 motion sensor is setup to receive GPS and compass information to

assist and optimize operation while in turns. The Junction Box is designed to

handle this and other data interchanges.

System Components

A diagram of the complete system is shown in Figure 4. The dashed lines

represent optional equipment and connections. A technical manual for

each sensor and component system is supplied with the ECHOSCAN.

SPU

LCDU

Junction

Box

Power

Supply

110VAC 24 VDC

ECHOTRAC

(Single Beam)

** Transducer

HPR

Side Scan

Processor

Data

Acquisition

COMAPSS

GPS

COMPASS

GPS

ODMS-05

GPS

Compass

XYt

Projector

Beams 1-15

Beams 16-30

ODMS-05

Com1

Figure 4

stem Block Dia

ram

04/26/02 6 Revision 1.11

Cable signal designations are as follows:

Signal Description

ODMS-05 Heave, Pitch, and Roll

COMPASS Compass Heading

GPS Position (normally GPVTG & GPGGA strings)

MB ECHOSCAN Multibeam Output String (see section 6.1)

T Trigger Signal to Side Scan Imaging System

P Side Scan Analog Signal (port side)

S Side Scan Analog Signal (starboard side)

XYt X & Y Position Plus Time

Table 1

Signal Cable Descriptions

When an echo sounder is interfaced to the SPU, repetition rate is

controlled by the update rate of the echo sounder.

Power Supply Considerations

The SPU is available in either AC or DC versions. The Junction Box,

however, operates only on 24 VDC. In most cases, the GPS receiver also

requires 12 or 24 VDC. It is highly recommended that each component of

the system requiring DC be powered by the same supply. This will

prevent grounding problems that may lead to equipment damage or injury.

The Junction Box only requires 25 watts while the SPU (DC version)

requires 75 watts. For a comfortable margin, a well-regulated supply, with

at least 200 watts output capacity should be used. Power supply (AC to

DC Converter) units are available from Odom.

04/26/02 7 Revision 1.11

Transducer Installation

In the majority of cases, transducer mounting is the most critical part of an

installation. It must be mounted securely at a position on the hull where it

is safe and where it will produce the least amount of drag and cavitation at

survey speeds. Careful consideration must also be given to the method of

deployment and retrieval. In its fully deployed position, allowances must

be made for both the bathymetry and side scan beams to clear the keel.

Figure 6 shows several examples of over-the-side mounts used in the

past.

Figure 5

Transducer Mounting Flange

04/26/02 8 Revision 1.11

A standard mounting flange is drawn in Figure 5. All dimensions

necessary to fabricate a mount for transducer are labeled in the drawing.

Inside dimensions of the pole must be no less than 2.5 inches to allow for

passage of the cables. Further information on transducer mounts may be

obtained from Odom.

Figure 6

Transducer Mounts

Hydraulically Operated

Bow Mount

04/26/02 9 Revision 1.11

Figure 6 contains several examples of over-the-side mounts. For added

stability, it is recommended that lines connected to the flange be tied off

forward and aft.

The tilting aluminum deck plate design shown in Figure 6 is also shown

with the transducer fully deployed and in the stowed position. For added

support, it is advisable to secure the mounting pole at two points

whenever possible or tie a line or cable forward and aft from the flange.

ECHOSCAN transducers are normally delivered with 50 feet (or 15

meters) of cable. Proper routing of cables should be a priority

consideration when planning a new installation. Deck cable extenders of

variable lengths are available from Odom.

SPU Connections

The Signal Processing Unit back panel connectors are described in Table

2. (Refer to Figure 7):

Designation Direction Description

RS232 Control Input /

Output

Normally connected to the LCDU, this RS232

I/O port provides control input to the

ECHOSCAN SPU

RS232 Data Output Identical to “RS232 Control” but only an output

port only normally connected to the acquisition

computer

RS232 Output RS232 Data Output (Auxiliary)

Auxiliary (undefined) (for future use)

Side Scan Starboard Output Analog side scan video from the starboard

(right) side

Reference Transducer Input /

Output

Connection to the built-in single beam

transducer (vertical)

Projector Output Drive signal for the 200 kHz projector array

Rx Array Inner Input Amplified signals from each of the 15 inner

beam receivers plus the port side scan receiver

Rx Array Outer Input Amplified signals from each of the 15 outer

beam receivers plus the starboard side scan

receiver

04/26/02 10 Revision 1.11

Ground N/A Provision for grounding the unit to ship’s hull

Power Input 110 VAC (75 VA) supply, or, if specified,

24VDC

Ext. Trig. Input Used to control the firing rate of the SPU when

operating in conjunction with a single beam

echo sounder

Side Scan Trigger Output Sync or “ping” pulse for external side scan

recorder or imaging computer (See Section 6.3)

Side Scan Port Output Analog side scan video from the port (left) side

Table 2

SPU Plug Descriptions

Figure 7

SPU Backpanel

To Acquisition / Navigation Computer

To LCDU

To Single Beam

To Transducer

To Side Scan

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