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Formal Reports

Report of results of completed projects or major milestones either in scientific terms or in terms acceptable to a wider audience. Note: Unless linked to the full text, reports are only available to NATO member nations from designated distribution centres. 

Documents

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Sonobuoy Placement for Optimal Multistatic Detection and Localization Sonobuoy Placement for Optimal Multistatic Detection and Localization

Date added: 10/01/2006
Date modified: 06/22/2012
Filesize: Unknown

Sonobuoy Placement for Optimal Multistatic Detection and Localization. NURC-FR-2006-020. October 2006.

This report studies optimal multistatic sensor placement strategies.  Our sensor placement approach specifically reflects operational objectives, through the choice of the target trajectory set.  In particular, the results illustrated in this report focus on the barrier (or port area protection) scenario.  We focus on two multistatic surveillance networks of interest; the first (one source and three receivers) is motivated by the experimental multistatic system available at NURC (the DEMUS system), while the second (two source and two receivers) provides comparison with a network with the same number of sonobuoys.  We study optimal placements in the FM-only case, the CW-only case, and the combined FM-CW case.  Optimal placements are consistent with our intuition, thus validating our placement methodology and its use as a placement aid in more complex scenarios where intuition is challenged.  The report leverages previous localization analysis and signal excess modelling conducted at NURC, for both FM and CW waveforms.  Our key contributions here include the development of an information-based optimization metric, its evaluation over target-trajectory sets rather than over conventional grid-point sets, and a careful accounting for multistatic issues including direct blast blanking.  In future work, we plan to compare actual tracking performance based on optimal sensor placements with performance based on sub-optimal placements.

Planning and evaluation of MCM missions using AUVs: mixing real and simulated data Planning and evaluation of MCM missions using AUVs: mixing real and simulated data

Date added: 09/01/2006
Date modified: 06/22/2012
Filesize: Unknown

Planning and evaluation of MCM missions using AUVs: mixing real and simulated data. NURC-FR-2006-017. September 2006.

This study was initiated by the NATO Undersea Research Centre in collaboration with SeeByte Ltd and Heriot-Watt University located in Edinburgh, Scotland. As AUVs equipped with sidescan sonars become more mature as an operational MCM tool, the ability to evaluate their capabilities and predict their performance becomes increasingly important. To date, tools developed for MCM assets have not successfully transposed to AUVs. There is therefore a gap between the predicted and observed operational performance of minehunting AUVs. This will become a critical issue as AUVs continue to be adopted as operational tools deployed by NATO nations. A 'system' based evaluation methodology has been proposed where a full system (vehicle + sonar + Automatic Target Recognition (ATR))is evaluated in various environments using real data. Existing AUV mounted sidescan sonars have very specific characteristics which are highly dependent on the environment, especially in shallow waters, and are therefore difficult to model. Initial results obtained on various REMUS missions have demonstrated the potential of the tool to assess AUV missions.

Secure deployable communications setup for unattended sensors (Forward Eyes) Secure deployable communications setup for unattended sensors (Forward Eyes)

Date added: 09/01/2006
Date modified: 06/22/2012
Filesize: Unknown

Secure deployable communications setup for unattended sensors (Forward Eyes). NURC-FR-2006-019. September 2006.

The execution of the NURC Scientific Programme of Work has demonstrated the value to operational commands of near real time environmental data in support of amphibious landings. The Forward Eyes covert system, composed of a meteo station, a wave-current meter and a surveillance camera, has been developed on the basis of that experience and tested during the Loyal Midas 05 Military Exercise. This report discusses the communications architecture developed by NURC for the Forward Eyes camera system, and provides all configuration data necessary to replicate it using Commercial Off The Shelf (COTS) devices. The IPSEC Virtual Private Network (VPN) concept presented in this document is applicable to mobile terminals and sensors that not only are connecting with dynamic (e.g. variable over time) IP addressing, but that are also “hidden” behind a gateway or firewall that performs network address translation or port address translation (NAT/PAT). This configuration applies therefore to a wide range of terminals with connectivity options that include dial-up, GPRS, or the Inmarsat Regional BGAN (RBGAN) service, to provide global communications coverage in support of operations conducted by NATO Expeditionary Forces.

A NATO tool for prediction of waves and longshore currents in the surf zone A NATO tool for prediction of waves and longshore currents in the surf zone

Date added: 07/01/2006
Date modified: 06/22/2012
Filesize: Unknown

A NATO tool for prediction of waves and longshore currents in the surf zone. NURC-FR-2006-014. July 2006.

A proto-type modelling framework has been developed for NATO which may be used to perform surf predictions in support of amphibious or special operations. The model concept involves a hybrid approach in which a spatially complete 2-D wave growth and transformation model (SWAN) is paired with a simple 1-D surf model (NSSM). This approach permits the more general application of basic surf models to environments in which they are not strictly valid. The framework provides a user friendly graphical user interface (GUI) which assists the user not only in developing model input files, running the models and displaying the results but also performs rudimentary data processing steps to facilitate these activities. The results indicate that the system developed provides reasonable  predictions and that the hybrid modelling approach used can be also applied in some areas  where the 1-D beach paradigm is not apparently valid.

Hybrid surf  modelling: final report Hybrid surf modelling: final report

Date added: 07/01/2006
Date modified: 08/13/2012
Filesize: Unknown

Hybrid surf  modelling: final report. NURC-FR-2006-016. July 2006.

Motivated by multiple requests for the development of a surf modelling capability within NATO, the NATO Undersea Research Centre created a research project in which one of the goals was to develop and test the framework for such a modelling capability. This report discusses the results of that portion of the surf modelling project. The guiding principle was that the modelling procedure framework developed must maximize its applicability and reliability while minimizing its complexity and computational requirements. The project vision was that the resulting product could be operated at sea by a properly trained METOC officer who had some access to global data bases.

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