Technical Specifications of Surface Buoy potx

Envirtech S.p.A. Cap. Sociale Euro 500.000 i.v.
Italy 30175 Venezia Marghera (VE) 4/A, Via Pacinotti
Phone +39 041 5313400 Fax +39 041 5313400
CCIAA VE 03852470107 - VAT: IT03852470107

Management
Italy 17031 Albenga (SV) 69/2, Via Patrioti
Phone +39 0182 559643 Fax +39 0182 570976

Branches:
Italy 31020 Vidor (TV) , 6/8 Via Sartori
Italy 30030 Chirignago (VE) 2, Via S. Caterina

e-mail
web-site www.envirtech.com






This document or parts of it cannot be used for scopes not authorized by Envirtech SpA that will protect its
rights.

Envirtech SpA
Venice, 15th February 2011

Envirtech Code: 20003-SPE-200.0

TSUNAMI WARNING SYSTEM


Technical Specifications of
Surface Buoy


Tsunami Warning System Code
20003-SPE-200.0
Date 15/02/2011

Technical Specifications of
Surface Buoy
Page 2 of 14




TABLE OF CONTENTS

1 SYSTEM OVERVIEW 3
2 SB ARCHITECTURE 4
3 SB FUNCTIONALITIES 10
4 TECHNICAL DESCRIPTION 11
4.1.1 Ballast and Mooring line specifications 11
4.1.2 Buoy Frame specifications 11
4.1.3 Day and Night Signalling devices 11
4.1.4 Autonomous Power supply system 11
4.1.5 Electronic Housing 12
4.2 SATELLITE MODEM 13
4.3 SURFACE ACOUSTIC MODEM 13
5 SB COMPLIANT TABLE 14



Tsunami Warning System Code
20003-SPE-200.0
Date 15/02/2011

Technical Specifications of
Surface Buoy
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1 SYSTEM OVERVIEW

The Tsunami Warning System (TWS) designed by Envirtech is composed of the following main
subsystems:

• an Underwater Module (UM) to be installed at the sea bottom in open sea location for the
accurate measurement of the tide and the identification of anomalous conditions.
• a Surface Buoy (SB) moored close to the UM to receive via acoustic link the measurement
of UM to be transferred via satellite link to a Data Centre (DC) for visualization and
analysis.
• a Data Centre (DC) on land composed of hardware and software infrastructures for the
reception via satellite link of the data of SB and UM to be displayed, stored and analysed.
ACOUSTIC LINK
SATELLITE LINK
UM
SB
DC


Fig. 1.1 – Envirtech TWS Overview


The present document deals with the architectural, functional and performance specifications of
the Surface Buoy (SB).



Tsunami Warning System Code
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Date 15/02/2011

Technical Specifications of
Surface Buoy
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2 SB ARCHITECTURE

The Surface Buoy (SB) system proposed is a SPAR buoy. Spar buoy is characterized by a tall and
thin configuration. It floats upright in the water and it is characterized by a small water plane and a
large mass. This configuration tends to be a stable ocean platform. Adjustment of the water plane
area and the mass allows spar buoys to be tuned so they tend to not respond to wave forcing.
The Envirtech SB is composed of 3 main parts:
- a subsurface pole;
- a buoyant (cone + cylinder) in the middle;
- a turret on the top.

The main advantages of this configuration for the specific applications are the following:
- the lower pole provide a reliable mechanical support of the acoustic modem and related
cable: the acoustic transducer can be mounted at least at 5-6m water depth to get a
reliable acoustic link.
- The buoyant can host on the top in the central part the battery and electronic unit with
related connectors.
- The turret on the top allows to mount the solar panels, the satellite modems and additional
devices like WiFi interface, meteorological station, etc.
- The hydrodynamic of the buoy proposed in characterised by small tilt movements: this
allows to get a vertical stable platform to optimise the performances of the acoustic link
between the buoy and the underwater module to get the data related to the tide and
tsunami detection.

A block diagram of the buoy proposed is reported in picture 2.1.


Tsunami Warning System Code

20003-SPE-200.0
Date 15/02/2011

Technical Specifications of
Surface Buoy
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cd SB Architecture
BUOY FRAME WITH SIGNALING DEVICES
BALLAST
MOORING
LINE
ELECTRONIC UNIT
AUTONOMOUS
POWER SUPPLY
SUBSYSTEM
SATELLITE
MODEM
WLAN MODEM
GPS
RECEIVER
ACOUSTIC
MODEM
METEOROLOGICAL
STATIONS
HEADING &
TILT SENSOR

Fg. 2.1 – SB Block Diagram

It is composed of the parts reported in the following table

Device/Component/Part Description
Mooring Line and Ballast
A line composed of a synthetic ropes,
mechanical accessories and 4 tons metal block
to anchor the buoy.
This parts requires a specific design taking
into account the depth and the meteo-
marine conditions of the specific
installation site.
Envirtech can provide the mooring line with
related design and dynamical analysis
results.

Tsunami Warning System Code
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Date 15/02/2011

Technical Specifications of
Surface Buoy
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Buoy Frame with signaling devices
A spar buoy equipped with the signaling
devices stated by IALA, IMO and IMA

standards and regulations.
It integrates mechanically all the parts listed
below in the present table.
Autonomous Power Supply Subsystem
A power supply system composed of solar
panels, a battery charger with related control
electronic and a lead gel battery pack.
Electronic Unit
An electronic system integrated in a water
proof case
Heading & Tilt Sensor
A heading and tilt sensor to monitor the buoy
movement, integrated in the Electronic Unit.
This part is optional and not included in the
standard version
GPS Receiver
A GPS receiver to monitor the buoy position at
sea integrated in the Satellite Modem
Surface Acoustic Modem
An acoustic modem installed at least at 5-6m
under the buoy
Satellite Modem
A satellite modem for the communication with
the Data Centre on land.
WLAN Modem
A device providing a broadband data link with
the installation and maintenance ship
Meteorological Station
A set of meteorological sensors (temperature,
humidity, pressure, wind speed and direction)

with related acquisition electronic.
This part is optional and non included in the
standard version

Drawings of the SB are reported hereinafter. It can be noted that the SB metal frame is equipped
with double supports for Satellite and Acoustic modems because on user request it is possible
to provide a redundant configuration. Anyway the standard version is without redundancy.




Tsunami Warning System Code
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Date 15/02/2011

Technical Specifications of
Surface Buoy
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Fig 2.2– Surface Buoy (Main Sizes and Weights)

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Technical Specifications of

Surface Buoy
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Fig 2.3– Surface Buoy (Detailed Parts)

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Figure 2.4 –Surface Buoy


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Date 15/02/2011

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Surface Buoy
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3 SB FUNCTIONALITIES

The main functionalities provided by the SB are summarized hereinafter:
• Self monitoring of SB status data composed of
o Electronic unit diagnostic status (battery voltage and current, internal temperature,
pressure and water intrusion).
o Buoy position from GPS receivers and notification of SB OUT or INSIDE a circular
zone centred on the mooring point of the SB.
• Autonomous transmission of SB status data to the Data Centre (DC) every hour or 2
hours, 3 hours, 4 hours, 6 hours depending on the user settings.
• Hourly logging of all SB status data in the internal mass memory.
• Generation and transmission on request to the DC of the current SB status data.
• Reception, execution and reply to settings commands or data request:
o change of the period of autonomous delivery to DC of the SB status data;
o ON/OFF of WiFi
o Test of SAT link.
o Current SB status request.
• Reception via Acoustic Transmission System (ATS) of the messages received by the
Underwater Module (UM) and forward of these messages to the satellite (SAT) modem.
• Reception via SAT modem of the commands/data requests for UM and forward of these
messages to the ATS to be sent to UM.
• Provide a low level commands menu via test cable or WiFi interface to test each device
and component.

Tsunami Warning System Code
20003-SPE-200.0
Date 15/02/2011

Technical Specifications of
Surface Buoy
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4 TECHNICAL DESCRIPTION

The specifications of the main components of the SB are reported in the following paragraphs.

4.1 Ballast and Mooring line specifications
The design depends to the installation site parameters and its water depth. It will be defined in the
detail design phase.

4.2 Buoy Frame specifications
The mechanical drawing of the buoy is reported in pictures 2.2 and 2.3. It is a spar type buoy able
to remain stable in vertical position and to support Beaufort 11. The buoy body is composed of a
central steel pole and a foam body having a diameter of 1.45 m.
The buoy weight is 2000 kg with a buoyancy of 2750kg.
All metal parts are zinc protected and epoxy painted (Metco-System).

4.3 Day and Night Signalling devices

1 day mark radar reflector;
1 marine light with independent battery and solar panel for a visibility up to 4 nautical miles;
Focal plane 3500mm.

4.4 Autonomous Power supply system
It is composed of 4 Solar Panel (Polycrystalline) 50W @12VDC each, and 4 Lead Gel
accumulators 110Ah @12VDC each. Each Solar panel has a dedicated charge controller to
optimise the efficiency of the whole system. The accumulators pack can supply the whole system
for more than 70 days in case of no sunny conditions.

Tsunami Warning System Code
20003-SPE-200.0
Date 15/02/2011

Technical Specifications of
Surface Buoy
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4.5 Electronic Housing
It is depicted in Fig 4.1


Fig 4.1 - Electronic Housing
Technical specifications:
• Box in Al and PTFE with 8 underwater connectors for
o Satellite Modems
o Acoustic Modems
o WiFi Box

o Power supply
• ENV-SB-ELE is dual and composed of
o CPU board
o Status board
o Switch board
o DC/DC board


Tsunami Warning System Code
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Date 15/02/2011

Technical Specifications of
Surface Buoy
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4.6 Satellite Modem
It is depicted in Fig 4.2

Fig 4.2 - Satellite Modem

Technical specifications:
• Inmarsat-C Message System
• Built-In GPS Antenna (12 Channels)
• RS232 Protocol
• Message Transfer Rate: 600 bit/sec.
• Message size: Max. 10 Kbytes.
• Operating frequencies Rx: 1525.0 – 1559.0 MHz.*

Tx: 1626.5 – 1660.5 MHz.*
GPS: 1575.42 MHz.

4.7 Surface Acoustic Modem
It is shown in picture 4.3 below.



Fig 4.3 – Surface Acoustic Modem

Its main features are the following:
- Spread spectrum modulation
- Omnidirectional
- Throughput of 5000 bps
- Case designed for 200mwd




Tsunami Warning System Code
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Date 15/02/2011

Technical Specifications of
Surface Buoy
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5 SB COMPLIANT TABLE

ID Requirement Note
1
The buoy shall be spar type to minimize the tilt movements
with the sea waves

2
The system buoy + mooring line shall be able to support
Beaufort 11 of wind and sea wave conditions

3
Specific detailed design of the mooring line with related
dynamical analysis verification shall be provided for each
installation site.

4
The buoy shall be predisposed for a redundant configuration
of the electronic system and the communication system
(satellite and acoustic link)

5
The buoy shall have day and night signaling devices IALA
compliant with a focal plan at least at 3m over the sea level.

6
The buoy shall be equipped with a short range wireless
communication system useful for real time communication
with a Laptop from the installation and maintenance ship.