Documents in the NTIS Technical Reports collection are the results of federally funded research. They are directly submitted to or collected by NTIS from Federal agencies for permanent accessibility to industry, academia and the public.  Before purchasing from NTIS, you may want to check for free access from (1) the issuing organization's website; (2) the U.S. Government Printing Office's Federal Digital System website http://www.gpo.gov/fdsys; (3) the federal government Internet portal USA.gov; or (4) a web search conducted using a commercial search engine such as http://www.google.com.
Accession Number ADA574796
Title Ocean Variability Effects on Underwater Acoustic Communications.
Publication Date Sep 2012
Media Count 7p
Personal Author A. Song M. Badiey
Abstract This proposed research seeks to identify, explain, and ultimately predict, the factors that significantly alter the operational effectiveness of underwater acoustic communications through experimental work and theoretical analysis. The long-term goal is to develop reliable, high rate transceivers customized for coherent underwater acoustic communications. The research objective is to investigate the relationship between environmental fluctuations and the performance of coherent underwater acoustic communications at high frequencies (8-50 kHz) through experimental research and data analysis. High rate communication methods are to be developed based on the understanding of acoustic propagation physics in dynamic shallow water environments. The acoustic channel is regarded as one of the most challenging environments for data communication. Often cited difficulties include extended multipath, fast temporal fluctuations, and large Doppler spread. These characteristics are challenging not only to receiver design, but also to channel modeling efforts. During the past year, we have dealt with both aspects, communication receiver design for high data rates and channel modeling for predicting modem performance in the dynamic ocean environment, based on our experimental data collected in shallow water regions in Kauai Island, HI.
Keywords Acoustic communications
Ber(Bit-error-rate)
Equations
Mmpe(Monterey-miami parabolic equation)
Multiband time reversal transceivers
Shallow water
Signal to noise ratio
Underwater acoustics
Underwater communications


 
Source Agency Non Paid ADAS
NTIS Subject Category 48G - Hydrology & Limnology
46A - Acoustics
45C - Common Carrier & Satellite
Corporate Author Delaware Univ., Newark. Coll. of Marine and Earth Studies.
Document Type Technical report
Title Note Annual rept.
NTIS Issue Number 1318
Contract Number N00014-10-1-0345

Science and Technology Highlights

See a sampling of the latest scientific, technical and engineering information from NTIS in the NTIS Technical Reports Newsletter

Acrobat Reader Mobile    Acrobat Reader