Odom ECHOSCAN User manual

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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
3D
Data
Display
Control
Panel

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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)

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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
MB
**
**
*
COMPASS
GPS
ODMS-05
GPS
Compass
XYt
T
P
S
Projector
Beams 1-15
Beams 16-30
ODMS-05
ODMS-05
Com1
Figure 4
S
y
stem Block Dia
g
ram

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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.

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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

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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

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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

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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