RV Leonardo outside Pianosa IslandSubsurface Telemetry Unit redeploymentPoint to Point transmissions, received signalsAfter some maintenance to the Subsurface Telemetry Unit and attached vertical array it was successfully redeployed this morning. The weather was calm after a windy weekend. Point to point measuremens are currently being performed by transmitting signals from the R/V Leonardo and receiving on the vertical hydrophone array.
Folaga deployment from RHIBFolagas with modemKM modem on FologaFolaga AUVs where deployed today from a RHIB in parallel an underwater acoustic communication link was established between the Folagas and the master modem deployed from the R/V Leonardo. Various geometries where tested including fixed stations at the surface, the Folagas moving on the surface, Folagas deployed at various depths in a stationary position and a underwater moving scenario.
FolagasFolagas and KM modemsFolagas in PortRV LeonardoLab workDuring these days signals were transmitted from the RHIB and pier location, various resources both equipment and personnel can be seen in the pictures.
Weather conditions did not permit the safe operation at sea nevertheless signal transmissions where performed from the pier using the Portable Acoustic Source Unit (PASU) and reception on the Subsurface Telemetry Unit (STU) 16 hydrophone vertical array. Initial results can be seen below.demodulated BPSK constellation
The weather permitted the deployment of the Subsurface Telemetry Unit with the 16 channel vertical hydrophone array, a Kongsberg Maritime Underwater Acoustic Modem and a 1km fiber optic and power cable connection to shore.
RV LeonardoThe RV Leonardo arrives at Pianosa Island and performs unloading of various equipment for the experiments. The equipment is brought to the shore lab and testing and configurations are performed. The RV Leonardo also begins a bathymetric multi-beam survey in preparation for the deployment of the Subsurface Telemetry Unit fiber optic cable.Folagas
Pianosa IslandPersonel from ISME, CINTAL, Kongsberg Maritime and SINTEF arrived at the Pianosa island at the end of the morning. Setup of the shore lab and testing of integration of Kongsberg modems was the main work for the day.
To complete missing events during the 17th of March experiment a second experiment was completed on the 19th of March at the Faro beach lagoon. The transmission was performed between two piers present at the lagoon, one was used for emission the other for the reception of signals. The two missing events (I and III) from part I were sucessfuly completed. Analysis of signals during the experiment and later at the lab showed that signals were correctly transmited and received. This event at the piers permitted the conclusion of the planned engineering test.
The engineering sea trial took place on the 17th of March 2010. Scientific and technical personel were present from CINTAL, Kongsberg Maritime (KM) and ISME. The objectives included the deployment of the Subsurface Telemetry Unit (STU) and a KM-modem from vessel 1 and the transmission of signals using the Portable Acoustic Source Unit (PASU), Acoustic Emission Reception Unit (AERU) and ACU from vessel 2. A total of 3 events were planned but not all of these were completed due to technical problems on the reception equipment. The event regarding the testing of the KM-modems was successfully completed. Because of the incomplete signal acquisition which involved the STU system it was decided to repeat a part of the experiment as soon as possible so that signals can be acquired for analysis and further development of algorithms.
