INTIFANTE Sea Trial 2000 (INTIFANTE'00)
Tróia, 9 - 29 October 2000
PRAXIS XXI contracts
INFANTE - 3/3.1/TPAR/2042/95
INTIMATE - 2/2.1/MAR/1698/95 (ending)
ATOMS - PDCTM/P/MAR/15296/1999 (starting)
António Pascoal
antonio@isr.ist.utl.pt
ISR - Instituto Superior Tecnico, Lisboa, Portugal
Emanuel F. Coelho
oceanografia@hidrografico.pt
Instituto Hidrográfico, Lisboa, Portugal
Sérgio M. Jesus
sjesus@ualg.pt
CINTAL - Universidade do Algarve, Faro, Portugal
Paola Picco,
picco@estosf.santateresa.enea.it
ENEA - Italy
Brief description
The INTIFANTE'00 sea trial took place from 9 - 29 October, 2000
in the continental platform near Setúbal, west coast of Portugal.
The research vessel involved was NRP DOM CARLOS I from the Portuguese Navy
and run by the Instituto Hidrografico. INTIFANTE'00 was composed of three
parts:
Environmental Survey from 16 to 29 October,
INFANTE'00 from 9 to 13 October,
INTIMATE'00 from 16 to 20 October.
Environmental Survey
During this part environmental data such as, CTD, geoacoustic,
seismic, bathymetry and currents was gathered in the designated
area to support the acoustic measurements to be performed under
INFANTE and INTIMATE.
INFANTE'00 Sea Trial
Objectives: this part of the sea trial served for testing underwater
acoustic communications
systems and to test the navigation system of a remote controlled catamaran.
It involved deploying transmission modules in the sea bottom and
communication either to the surface and/or to an high-frequency array of
receivers.
Scenario:the NRP Dom Carlos I deployed the bottom and
surface modules for
testing underwater communication algorithms and methods. She also
deployed the catamaran (DELFIM) for autonomous navigation testing. During
two days off-vertical transmissions were performed from bottom module
to a surface suspended array of receivers transmitting received signals
via radio back to NRP Dom Carlos I for monitoring, checking and backup.
INTIMATE'00 Sea Trial
Objectives: this sea trial followed previous experiments (see
INTIMATE'96 ) and has the objective of determining
internal tides by
means of acoustic tomographic measurements. Additional objectives during
this sea trial were to acquire data to support highly range-dependent
source tracking and tomographic inversion with random signals (either
computer generated or ship induced noise).
Scenario: NRP Dom Carlos I deployed a sound source and
transmitted signals
to a moored vertical array and listened to received
signals via an RF link. The sound source performed a number of
geometries around the receiving array. The sound source was loaned by
courtesy of SACLANT Undersea Research Centre, La Spezia, Italy.
Cruise Report
Starting was delayed for 4 days due to adverse weather
conditions. INFANTE has completed one event out of 3 due to equipment
failure (lack of communication between bottom and surface modules). DELFIM
catamaran deployment was accomplished during the third week. INTIMATE
objectives have reached 100% completion with over 50 GBytes of data acquired.
Environmental survey tasks have been only partially achieved due to the
redraw of NRP Almeida Carvalho due to equipment failure. In order to achieve
a sufficiently accurate oceanographic description of the area, NRP D. Carlos I
performed extra oceanographic measurements with the collaboration of
Paola Picco from ENEA. Seismic and sidescan sonar surveys were done during
the third week with success.
Some pictures taken during the sea trial:
last update on April 20, 2001