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Memorandum Reports

Report that covers interim results during the course of a project. Note: Unless linked to the full text, reports are only available to NATO member nations from designated distribution centres.

Documents

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Final memorandum report on the sea tests and demonstration results for the CMRE docking station capability Final memorandum report on the sea tests and demonstration results for the CMRE docking station capability

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Date added: 02/07/2018
Date modified: 02/07/2018
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Final memorandum report on the sea tests and demonstration results for the CMRE docking station capability. Grati, Alberto; Carta, Alessandro; Grandi, Vittorio. CMRE-MR-2017-011. December 2017.

The work reported in this document is part of PARC's work package 4 named "Hard problems in the Maritime Unmanned System Domain" and specifically focuses on the hardware, software and mechanical upgrade implemented on the AutoLARS launch and recovery system as well as on the eFolaga AUV, in order to comply with the PARC WP4 docking station final objectives that call for a fully automated homing and docking capability.
This report illustrates the mechanical, software and hardware upgrades aimed at extending the automation in order to cover the functionalities that were previously managed by the operator, namely:
a) Automatic switchover between a "port inspection mission" and a "homing & docking mission" as a consequence of a "low battery" event;
b) 3D guidance capability;
c) Automatic AUV alignment detection, locking, batteries contactless recharging activation, wireless data offload, undocking and return to normal mission,
and at improving system robustness, flexibility and interoperability.
Despite several mechanics, electrical, electronics and software issues occurred during the engineering tests, the above key objectives were successfully achieved.
This report, in particular, shows that the several tests conducted at sea, in conjunction and in collaboration with the CommsNet17 sea trial, have demonstrated that the modified AUV mission control software was able to provide the AUV with the capability to automatically switch from a networking mission to a docking mission in order to recharge and offload the collected data.

 

Study of passive sensing system on long-endurance - low-power platforms Study of passive sensing system on long-endurance - low-power platforms

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Date added: 02/07/2018
Date modified: 02/07/2018
Filesize: Unknown

Study of passive sensing system on long-endurance - low-power platforms. Tesei, Alessandra ; Meyer, Florian. CMRE-MR-2016-019. December 2016.

This work addresses a passive sensing system for ASW applications, suitable to be hosted on low-power - long-endurance platforms. Passive acoustic monitoring of a sea area is an important capability for many applications that can range from ISR to ASW. Traditional ways to approach this problem are either massive use of air-controlled LOFAR/DIFAR sonobuoys, deployment of long arrays towed from ships, or use of cabled networks of sparse sensors deployed from shore. In order to reduce the costs and, at the same time, allow portability, flexibility and re-configurability of such a monitoring acoustic system, the exploitation of covert, low-power, long-endurance, smart sensors is particularly appealing. The present study addresses the design of a sensing system based on underwater technologies. Particular emphasis is given to low-power, small-size and light sensor systems that can be hosted on, or towed from, low-power/long-endurance unmanned mobile platforms, such as underwater gliders and WaveGliders. 

A re-examination of the Brillouin scattering LIDAR pier demonstration: new insights (maritime testing and validation for vertically profiling sound speed, temperature and underwater targets) A re-examination of the Brillouin scattering LIDAR pier demonstration: new insights (maritime testing and validation for vertically profiling sound speed, temperature and underwater targets)

Date added: 06/16/2017
Date modified: 06/16/2017
Filesize: Unknown

A re-examination of the Brillouin scattering LIDAR pier demonstration: new insights (maritime testing and validation for vertically profiling sound speed, temperature and underwater targets). Trees, Charles; Fournier, Georges; Rupp, David; Friman, Sonja; Walther, Thomas. CMRE-MR-2017-004. June 2017.

Battlespace characterization of maritime domains, within the objectives of ISR (Intelligence, Surveillance, and Reconnaissance) requires the observation, analysis, and prediction of environments, including natural and contextual underwater and surface parameters that may have an impact on on-going and/or planned missions. One of the aims of project SAC000711 (Sensing Underwater Acoustic Pressure through Brillouin LIDAR Scattering) is to investigate the potential use of LASER and LiDAR technology to remotely sense underwater ocean-acoustic properties. This report describes the work done to evaluate the potential use of Brillouin Scattering LiDAR to measure temperature and sound speed in the water column, by exploring a data set collected during a pier experiment conducted at CMRE. The investigation of the Brillouin Scattering LIDAR phenomena from CMRE?s pier sent a pulsing laser beam (500µJ pulse-1, 10nsec duration and at 1kHz repetition rate, wavelength of 543.3 nm) into the water. It was selected to also study and provide exploratory work on the optical-acoustic relationships that exists as the laser pulse travels through the water column. A transmitting and receiving system (acoustic modem) was also deployed in the general area of the Pier Demo to evaluate the potential for the BSL to provide both an acoustic source and a receiver as well as the thermal expansion of the water column (optoacoustic) during these pulsed events, these studies will be used and discussed in future work. Results show that the early prototype system is capable to retrieve the physical parameters like water temperature and can also provide full light extinction estimates along the water column. Further exploitation of this technology will require the on-set of an improved system.

 
 

Combined analysis of LOGMEC16 oceanographic glider and satellite data and their correlation Combined analysis of LOGMEC16 oceanographic glider and satellite data and their correlation

Date added: 05/23/2017
Date modified: 05/23/2017
Filesize: Unknown

Combined analysis of LOGMEC16 oceanographic glider and satellite data and their correlations. Borrione, Ines; Oddo, Paolo; Russo, Aniello; Coelho, Emanuel. CMRE-MR-2017-003. April 2017.

During the LOGMEC16 (Long-Term Glider Mission for Environmental Characterisation) sea trial carried out in the eastern Ligurian Sea (North-western Mediterranean Sea), two oceanographic gliders rated to a maximum depth of 1000m were operating continuously from 3 May to 27 June 2016. When possible, glider tracks were synchronised with the footprints of contemporaneous altimeters (i.e., Jason 2, SARAL/AltiKa and CryoSat-2). Temperature and salinity measured by the gliders that were co-localised with the altimeter passages, were used to calculate along-track dynamic heights. The latter were then compared with the near-real time absolute sea level CMEMS-TAPAS (Copernicus Marine Environment Monitoring Service - Tailored Altimetry Products for Assimilation Systems) product. Where available, the CMEMS near-real time 1 km resolution, Aqua-MODIS ocean colour data was also used as a tracer of the main oceanographic features of the region. Comparison between SLA derived from gliders and TAPAS along common transects, shows that patterns, variability, and scales in the filtered SLA are comparable to those obtained from glider measurements. Differences are mostly explained by the fact that gliders have sampled at different times the same structures, which were moving northwards at ~ 0.16 m s-1. Conversely, the unfiltered SLA shows a variability that is not fully captured by the in situ measurements. Both gliders and SLA provide evidence of mesoscale variability (i.e., meanders) likely due to the baroclinic instability of the Northern Current. The scales of these structures (i.e., amplitude of 39 km, and propagation speed of 0.16 m s-1) are in agreement with those previously described in literature, and are confirmed by the larger scale ocean colour measurements.

ISR Implementation of ocean optics protocols to estimate spectral absorption coefficients of particles, suspended matters and phytoplankton pigments in ALOMEx'15 water samples: results and comparisons with satellite measurements ISR Implementation of ocean optics protocols to estimate spectral absorption coefficients of particles, suspended matters and phytoplankton pigments in ALOMEx'15 water samples: results and comparisons with satellite measurements

Date added: 04/24/2017
Date modified: 04/24/2017
Filesize: Unknown

ISR Implementation of ocean optics protocols to estimate spectral absorption coefficients of particles, suspended matters and phytoplankton pigments in ALOMEx'15 water samples: results and comparisons with satellite measurements. Pennucci, Giuliana; Sanjuan Calzado, Violeta. CMRE-MR-2016-021. March 2017.

One of the main requirements for a comprehensive characterisation of water column optical properties is the simultaneous acquisition of physical and biological parameters that are traditionally observed using satellites, laser systems, ships and moorings, especially in dynamic areas. The Atlantic Lidar Optical Measurements Experiment 2015 (ALOMEx'15), conducted from 31 October to 12 November 2015 the Alboran Sea and Sahara Upwelling, provided an attempt at determining in situ measurement uncertainties by comparing instrument specific calibrations and measurement protocols. In this context, two different topics have been addressed in this report: (1) post- processing algorithms development to analyse optical water column properties and (2) data comparison and validation using satellite imagery. Specifically, introduction and conventions are provided in the first part of this document (Sections 1 and 2), while the post-processing algorithms which were implemented at CMRE to analyse bio-optical and radiometric measurements performed simultaneously with the Lidar system and optical satellite data (i.e. from the Moderate Resolution Imaging Spectroradiometer, MODIS, and the Visible Infrared Imaging Radiometer Suite, VIIRS) are described in Section 3. The dataset retrieved from the available in situ water samples (Section 4) is successively used to investigate the ubiquity of optical linkages between the ocean and atmosphere at the global scale using data acquired during a Saharan dust phenomenon that occurred during the cruise. We analysed match-ups comparison between coincident (+/- 1hour) in situ and satellite retrievals, as well as historical satellite measurements to investigate the seasonal variability (Section 5). Results corroborate the hypothesis that the biasing of satellite chlorophyll-a retrievals are correlated with high deposited dust concentrations and may help climatologists to understand the impact of aerosols on correction for satellite ocean data, leading to better ocean colour products (e.g. atmospheric correction and ocean colour algorithms), especially in the presence of dust or other anthropogenic pollutants comparing.

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