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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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Automatic Target Recognition in Synthetic Aperture Sonar Imagery using Template Deformation and Gaussian Processes Automatic Target Recognition in Synthetic Aperture Sonar Imagery using Template Deformation and Gaussian Processes

Date added: 03/01/2007
Date modified: 06/22/2012
Filesize: Unknown

Automatic Target Recognition in Synthetic Aperture Sonar Imagery using Template Deformation and Gaussian Processes. Williams, D.; Myers, V. NURC-FR-2007-006. March 2007.

This report describes a method for performing automatic target recognition (ATR) of targets of interest in synthetic aperture sonar (SAS) images. ATR is considered an enabling technology for mine countermeasures (MCM) operations using autonomous underwater vehicles (AUVs). The ability to detect and classify targets in side- and forward-looking highfrequency sonars can be used to significantly augment the ability for AUVs for onboard decision-making, resulting in reduced mission time. This is achieved by intelligently making decisions about mission parameters in real time and relying less on human intervention and the limited communications bandwidth underwater.

Evaluation of Minehunting Concepts Based on AUVs Evaluation of Minehunting Concepts Based on AUVs

Date added: 05/01/2007
Date modified: 06/22/2012
Filesize: Unknown

Evaluation of Minehunting Concepts Based on AUVs. Rothenbach, M.; Sodhi, M.; Bovio, E. NURC-FR-2007-008. May 2007.

The report evaluates by computer simulation and analytical methods the potential role of different classes of AUVs in a variety of MCM scenarios. The five scenarios selected are: a strategic sea line of communications (SLOC); a strategic port; fleet operating areas; amphibious operation areas; and inspection of own harbour. The four classes of vehicles range from large AUVs equipped with long range/high resolution Synthetic Aperture Sonar (SAS) and large battery capacity, to medium size vehicles equipped with SAS or high performance Side Scan Sonar (SSS), ending with fleets of small light weight AUVs equipped with entry level SSS. The report describes the criteria, the computer simulations and analytical tools used to compare the performance of the various systems. In addition to the study of the above scenarios, the report examines the influence of the bathymetry for the AUV mission planning, and analyses optimal search techniques for multi vehicle operations. The study concludes that the required performance can be achieved in all scenarios by at least one type of vehicle, but one type only does not perform well in all scenarios. In general large areas require large vehicles; confined spaces are better handled by small vehicles. Overall the medium AUV with SAS is the preferred solution.

AUV Navigation Systems for MCM Operations AUV Navigation Systems for MCM Operations

Date added: 05/01/2007
Date modified: 06/22/2012
Filesize: Unknown

AUV Navigation Systems for MCM Operations. Baralli, F.; Evans, B.; Coiras,E.; Bellettini, A. NURC-FR-2007-007. May 2007.

This report documents the analysis performed within the project 3G1 on the accuracy of COTS Navigation Systems for AUVs. Performance improvements in using innovative navigation aids like, SAS-micro-navigation and contact matching are also assessed. Accuracy assessments are conducted by analysing data collected by different vehicles during trials/exercises organised by NURC in different environments/areas. AUVs are divided into two classes depending on their navigation systems: Aided Inertial Navigation and LBL aided dead-reckoning. Particular attention is taken in the definition of the performance of AUV navigation systems for the execution of military missions such as mine disposal in shallow water, change detection and port protection.

Benchmarking scattering from spheres and cylinders near the seafloor: A numerical comparitive study Benchmarking scattering from spheres and cylinders near the seafloor: A numerical comparitive study

Date added: 05/01/2007
Date modified: 06/22/2012
Filesize: Unknown

Benchmarking scattering from spheres and cylinders near the seafloor: A numerical comparitive study. Jensen, F.B.; M. Zampolli, M.; Tesei, A. NURC-FR-2007-005. May 2007.

A workshop was organized to assess the state-of-affairs in target scatter modeling, both for low-frequency (0.1–10 kHz) and high-frequency (>=100kHz) applications. The problem set included free-field scenarios as well as scattering from targets that were proud, half-buried or fully buried in the sediment. Ten different organizations provided solutions to the various test problems. Low-frequency results are abundant for most test problems, whereas high-frequency solutions were provided only for the free-space cylinder with different material parameters and fillings. A detailed comparison between the various solutions for each test problem are presented and low-frequency reference solutions are identified for all but one of the eleven test problems.

SUPREMO v.2.0 program description SUPREMO v.2.0 program description

Date added: 06/01/2007
Date modified: 06/22/2012
Filesize: Unknown

SUPREMO v.2.0 program description. Prior, M.K. NURC-FR-2007-011. June 2007.

A program description for version 2.0 of the SUPREMO multistatic sonar performance model is provided. SUPREMO allows scientists and engineers engaged in sonar research to predict underwater acoustic signal and interering background intensities. Program operation is explained in a step-by-step manner along with relevant program assumptions and approximations.

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