June 2009 Issue

SEAFLOOR MAPPING
SONAR SYSTEMS
VESSELS
Volume 50, No. 6

COVER
Synthetic aperture sonar (SAS) image of a World War II Heinkel He 115 seaplane in shallow water outside Tromsø, Norway. Data were recorded and processed to four by four-centimeter resolution by the Royal Norwegian navy mine warfare service during a 2009 navy operation. Information for this image was gathered using a Kongsberg (Kongsberg, Norway) HISAS 1030 interferometric SAS on a HUGIN 1000 MR autonomous underwater vehicle. (Photo courtesty of the Royal Norwegian navy and Kongsberg Maritime.)

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Feature Articles

INSTRUMENTATION TO MEASURE RAINFALL AT SEA USING FOR RADON AND ACOUSTIC DETECTION
Dr. Christos Tsabaris, Dr. Marios Anagnostou and Stylianos Alexakis (Hellenic Centre for Marine Research) discuss the design and application of a platform for rainfall monitoring using in-situ autonomous sensors.

U.S. GOVERNMENT FISCAL YEAR 2010 BUDGET
The Sea Technology editorial staff outlines the fiscal year 2010 budget.

DESIGN AND DEVELOPMENT TAKE RESON TO NEW DEPTHS
—Company Profile

A BISTATIC HF RADAR FOR CURRENT MAPPING AND ROBUST SHIP TRACKING
Dr. Dennis B. Trizna (Imaging Science Research Inc.) shows how recent bistatic ship tests validate a new high-frequency radar technology.

NOIA HOLDS ANNUAL MEETING IN WASHINGTON, D.C.
—Conference Report

VIRTUAL ARRAY PROCESSING OF DIFAR SONOBUOYS
Abdalla Osman (University of Calgary) and Dr. Aboelmagd Noureldin (Royal Military College of Canada) review an approach for processing spatially aliased arrays of DIFAR sonobuoys for enhanced underwater tracking.

UPWARD LOOKING SONAR-BASED MEASUREMENTS OF SEA ICE AND WAVES
David B. Fissel and John R. Marko (ASL Environmental Sciences Inc.) discuss a field test of a new-generation ice profiler in the Northumberland Strait between New Brunswick and Prince Edward Island.

IHO S-100 SEEKS TO BECOME A VERSATILE INDUSTRY STANDARD
Capt. Robert Ward (International Hydrographic Bureau) explains how the IHO’s new hydrographic geospatial standard for marine data and information is not just for hydrographers.

NEXT MONTH:
Update on the development and testing of a new long-duration solar-powered autonomous surface vehicle...A new, compact ocean bottom cabled seismometer system for spatially dense observation on the seafloor...Design of a deepwater subsurface mooring for a high gain radiated noise measurement system...Power delivery to subsea cabled observatories...SEACON Brantner company profile.....Pressure-tolerant lithium-polymer batteries.