Index of content:
Volume 119, Issue 5, May 2006
- UNDERWATER SOUND 
Measurement and simulation of the channel intensity impulse response for a site in the East China Sea119(2006); http://dx.doi.org/10.1121/1.2189449View Description Hide Description
A model for the channel intensity impulse response is presented that is generally applicable for source-receiver ranges less than ten water depths. The separate impulse response functions from each arrival, such as the single surface bounce or surface-to-bottom bounce, are modeled using bistatic scattering concepts and are incoherently summed for the total response function. The expression is equivalent to a time-averaged response and embodies the boundary scattering and reflection physics corresponding to the center frequency at which computations are made. To compare with observations, is convolved with representations of the 8- and continuous wave (CW) pulses, and an frequency-modulated(FM) pulse, that were used in the Asian Sea International Acoustics Experiment conducted in the East China Sea (depth ). For the FM case the computation frequency is , the center frequency of the FM pulse. It is found that six primary arrivals dominate the response for ranges less than about . With modeling of limited to these paths, the basic structure of is set by bottom properties and acquisition geometry with some changes in intrapath time spreading that depend on sea surface conditions.