May 2008 Issue
COMMUNICATIONS; TELEMETRY;DATA PROCESSING
Volume 49, No. 5
COVER
Envirtech (Genoa, Italy) designed and developed the deep-sea Poseidon-class tsunami detection systems using high-resolution pressure sensors. The exchange of commands/messages and the notification of alarms to the ashore center are made possible using highly robust LinkQuest (San Diego, California) UWM3000 underwater acoustic modems. Poseidon systems are currently operating in the Bay of Bengal in the Indian Ocean at about 3,400 to 3,500 meters of water depth. (Photo courtesy of LinkQuest Inc.)
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Feature Articles
NOAA’S NATIONAL DATA BUOY CENTER DATA ASSEMBLY CENTERDr. Richard L. Crout and Dr. William H. Burnett (National Data Buoy Center) explain the evolving infrastructure and increasing data management requirements of the U.S. Integrated Ocean Observing System.
U.S. GOVERNMENT FISCAL YEAR 2009 BUDGET
The Sea Technology editorial staff outlines the fiscal year 2009 budget.
COMMUNICATIONS TECHNOLOGY EVOLVES TO BETTER SERVE THE OFFSHORE INDUSTRY
Dr. Qian Zhong (Tyco Telecommunications) discusses the development of an OADM trunk-and-branch suite of undersea hardware to lead communication systems into the future.
PACON 2008: ENERGY AND CLIMATE CHANGE
—Conference Preview
LOW SIGNAL-TO-NOISE RATIO UNDERWATER ACOUSTIC COMMUNICATIONS
Dr. T.C. Yang (Naval Research Laboratory) and Dr. Wen-Bin Yang (National Institute of Standards and Technology) explore channel effect and signal processing for direct-sequence spread-spectrum signaling.
UNDERSEA DEFENCE TECHNOLOGY 2008
—Conference Preview
A CHANNEL-SHARING SCHEME FOR UNDERWATER CELLULAR NETWORKS
Milica Stojanovic (Massachusetts Institute of Technology) and Borja M. Peleato (Stanford University) discuss how to take advantage of the long propagation delays in the design of underwater half-duplex cellular networks.
CHALLENGES AND ISSUES IN WAVE ENERGY CONVERSION
Dr. Asfaw Beyene (San Diego State University) and Dr. James H. Wilson (Planning Systems Inc.) look at the technical, environmental and permitting challenges facing wave energy conversion for the California Coast.
NOIA MEMBERS GATHER FOR ANNUAL MEETING IN WASHINGTON, D.C.
—Conference Report
NEXT MONTH:
Vertical position error estimation in TPE and CUBE for hydrographic surveying....Extending the multibeam angular sector to improve seafloor classification....Exploring the West Florida Escarpment with high-resolution geophysical imaging....Shallow-water survey efficiency using swath bathymetry....Oceanology International 2008 conference report.