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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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2014 workshop on decision support and risk assessment for asset planning (DeSRAAP 2014) 2014 workshop on decision support and risk assessment for asset planning (DeSRAAP 2014)

Date added: 02/01/2016
Date modified: 02/01/2016
Filesize: Unknown

2014 workshop on decision support and risk assessment for asset planning (DeSRAAP 2014). Vicen Bueno, Raul. CMRE-MR-2015-015. December 2015.

The 2014 Decision Support and Risk Assessment for Asset Planning (DeSRAAP 2014) workshop was organized at NATO STO CMRE to bring together military personnel and research communities to understand and address shortfalls in operational planning aids to assist decision makers. It took place on 9- 11 July 2014 at the NATO STO CMRE facilities in La Spezia, Italy. The workshop focused on understating how the environment conditions the planning and execution of operations in the maritime domain. Several factors and time scales were considered as a consequence: meteorological and oceanographic (METOC) conditions; resources (assets, often limited); as well as socio/economic/political factors. The main objectives of the DeSRAAP 2014 workshop were: Risk assessment; Environmental impact in civilian and military assets (ports, infrastructures, vessels, etc.); Decision support; and Asset planning. A total of 34 military personnel and researchers participated in the DeSRAAP 2014 Workshop. They came from 10 different NATO nations and from 13 different military and research institutions. The presentations provided by each participant are available in a user-password protected NATO STO CMRE server, which can be accessed under request. NATO STO CMRE personnel acquired knowledge of tools/systems on the workshop topics developed by other institutions. An agreement of collaboration between 11 of the 13 organizations participating in the workshop was reached. This agreement is focused on working together on topics relevant to NATO nations, such as: predicting and managing uncertainty; generation of scenarios of potential common interest (counter piracy, illicit activity, irregular migration, oil spill, ice, and coastal areas); and system interoperability.

An unbiased sway estimator for wide aspect synthetic aperture sonar applications An unbiased sway estimator for wide aspect synthetic aperture sonar applications

Date added: 01/25/2016
Date modified: 02/01/2016
Filesize: Unknown

An unbiased sway estimator for wide aspect synthetic aperture sonar applications. Hollett, Reginald D. CMRE-MR-2015-017. January 2016.

In the case of wide aspect synthetic aperture sonar applications, the estimation of sway is subjected to a bias. The bias is taken into account by decomposition into a primary bias an a secondary bias. The performance of the unbiased sway estimator is assessed on the basis of the deviation of estimated values of sway from known values. In the case of sways up to ±1 cm, typical of operational situations, the deviation is found to lie within ±0.1 mm. In the case of a track, the deviation of the estimated position from the known position is found to amount to no more than 2 mm over a distance of 100 m.

CORSAR - a rapidly relocatable ocean forecast system CORSAR - a rapidly relocatable ocean forecast system

Date added: 01/19/2016
Date modified: 01/19/2016
Filesize: Unknown

CORSAR - a rapidly relocatable ocean forecast system. Onken, Reiner. CMRE-MR-2015-011. November 2015.

A prototype of a relocatable real-time ocean operational system named CORSAR, has been successfully implemented for a subregion in the western Mediterranean Sea. The core of CORSAR is ROMS (Regional Ocean Modeling System) which is one-way nested in the global MERCATOR ocean model. At the sea surface, ROMS is driven by the RLM13 atmospheric prediction model, and observational data are assimilated whenever they are available. Since early 2015, CORSAR runs on a daily schedule and provides nowcasts and 72-hours forecasts of the prognostic quantities temperature, salinity, horizontal velocity, and sea surface height. In addition, information about the three-dimensional distributions of potential density and sound speed, the depth of the sound speed minimum and the mixed-layer depth is created from the prognostic variables. The horizontal resolution of CORSAR is about 1.5 km which requires a downscaling factor of about 6 from MERCATOR, and the horizontal resolution of RLM13 is about twice the resolution of the atmospheric prediction model forcing MERCATOR. This enables the evolution of mesoscale and submesoscale features in CORSAR which were not visible in MERCATOR, and more realistic atmosphere driven patterns.

Validation of the Goal-Oriented Decision Support System in the context of counter-piracy interdiction operations in the Indian Ocean Validation of the Goal-Oriented Decision Support System in the context of counter-piracy interdiction operations in the Indian Ocean

Date added: 12/23/2015
Date modified: 12/23/2015
Filesize: Unknown

Validation of the Goal-Oriented Decision Support System in the context of counter-piracy interdiction operations in the Indian Ocean. Bourque, François-Alex. CMRE-MR-2015-016. December 2015.

In an effort to address the problem of conducting counter-piracy interdiction operations in the Indian Ocean, the NATO Science and Technology (STO) Centre for Maritime Research and Experimentation (CMRE) developed the Goal-Oriented Decision Support System (GO-DSS). Within that specific operational context, this contribution validates the approach used in the GO-DSS focusing on two core elements of its methodology, namely the risk forecasts used as input and the evolutionary vessel routing algorithm implemented in the Optimal Asset Allocator (OAA). Part of the GO-DSS design philosophy being predicated on environmentally forecast risk of piracy, the spatio-temporal characteristics of these risk maps is explored and conclusions are drawn in regards to the validity of the spatial variability observed and of the concept of risk as a time-varying quantity. A comparative performance analysis is then conducted pitting the OAA against two alternatives: a placement strategy where vessels do not stray throughout the planning horizon and a greedy approach for vessel routing with identical initial conditions. Comparing the performance between all three models then allows us to address the question of the validity of the OAA?s vessel routing algorithm, another tenet of the GO-DSS approach, at least within the specific context of counter-piracy interdiction operations in the Indian Ocean. A general discussion on the usefulness of routing within this context is, however, left as a future effort.

Considerations on using a glider-mounted single beam echo sounder for smart sensing of local seabed characteristics Considerations on using a glider-mounted single beam echo sounder for smart sensing of local seabed characteristics

Date added: 12/23/2015
Date modified: 12/23/2015
Filesize: Unknown

Considerations on using a glider-mounted single beam echo sounder for smart sensing of local seabed characteristics. Nielsen, Peter L. ; Troiano, Luigi. CMRE-MR-2015-014. December 2015.

Knowledge of the seabed properties are critical information to perform reliable sonar performance predictions, particularly in shallow-water regions where the transmitted sound has multiple interactions with the ocean boundaries. These ocean properties are often considered as the most difficult to obtain. State-ofthe- art measuring techniques and the latest development in analysis methodologies including inference theory are often too cost and labour intensive for operational purposes. Advances in the technological development of autonomous underwater vehicles (AUV) may provide an opportunity to establish seabed properties over large areas in access denied regions. This report describes a feasibility study in using a glider platform equipped with a low-frequency single-beam echo sounder operating at normal incidence to the ocean bottom for seabed characterisation. The results provide a CMRE proposal of hardware to be installed on a glider platform and an estimate of power consumption at specific source level and pulse repetition rate. Simulations of the sensor output are performed to estimate possible seabed parameters including stratification, sound speed, density and attenuation for each layer together with the maximum detection depth into the seabed. This analysis naturally leads to an on board the glider processing chain to perform smart sensing, i.e., only transfer of critical seabed characteristics from the operating glider to a control centre.

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