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Underwater acoustic simulations with a time variable acoustic propagation model

Accepted for European Conference on Underwater Acoustics 2010

A. Silva,
O. C. Rodrígues,
F. Zabel,
J. Huilery,
S. M. Jesus,
Institute for Systems and Robotics, University of Algarve
Campus de Gambelas, PT-8005-139 Faro, Portugal
Ref.: European Conference on Underwater Acoustics 2010 ,

Abstract:The Time Variable Acoustic Propagation Model (TV-APM) was developed to simulate underwater acoustic propagation in a time-variable environment; such variability induces a strong Doppler channel spread, which represents an important factor to test and to estimate the performance of equalization algorithms. In current simulations Doppler spread is usually included a posteriori over a stationary Acoustic Propagation Model (APM), and is design for specific environmental parameters as source-receiver range variability or surface motion. However, environmental variations affect Doppler spread in a complex manner, and an accurate TV-APM simulation along a time variable experiment, being performed at the same sampling rate as the transmitted signal, would require a huge number of runs for high frequencies. A strategy in the current implementation of the TV-APM was developed to reduce the number of runs, while preserving the variable-channel Doppler spread. Simulations were compared with real experiments communication signals and the results revealed that the TV-APM is a useful prediction tool of communication equalizers performance.