Autoregressive Modeling of Nonstationary Multibeam Sonar Reverberation

The Sonar Simulation Toolset, Release 4.6: Science, Mathematics, and Algorithms

“…This led to updated high-frequency environmental models [APL Models 1994], an optional scattering-function reverberation model [Luby Lytle 1987], frequency-dependent environmental models and beam patterns, and the "data flow" architecture (Sec. 4.3).…”

“…The basic idea has been described by Luby and Lytle [Luby Lytle 1987], Hodgkiss [Hodgkiss 1984], and Chamberlain and Galli [Chamberlain Galli 1983], all of which built on the classic work of Faure [Faure 1964], Ol'shevskii [Ol-shevskii 1967], and Middleton [Middleton 1967]. SST's implementation is applicable to far more real systems than the versions described in those references because we have discarded most of the simplifying assumptions: short narrowband pulses, isovelocity single-path propagation, monostatic geometry, and others.…”

Frequency Agile Detection Performance for a Fast-Moving Forward-Looking Active SONAR

“…where ( ) (10) generalizes Luby's and Lytles's result [2] for an iso-velocity, single scattering path channel to channels with arbitrary sound velocity profiles and multiple scattering paths. It omits the impact of Doppler spreading associated with the ocean surface but for our application this is negligible in comparison to the spreading caused by the vehicle motion.…”

“…The models in [1][2] were restricted to iso-velocity channels with a single boundary interaction. More recently, Goddard [3][4] has developed the SONAR Simulation Toolset, which is an advanced set of algorithms that generate SONAR signal time-series that support the testing and simulation of numerous SONAR systems in a very general way.…”

“…Because the motion induced Doppler spreading associated with such a system is a critical factor in determining SONAR detection performance, it is necessary to accurately account for these Doppler spreading effects in any performance model. In the following we develop a model that extends the ideas of [1][2]. Our reverberation model is more general in the sense that it allows for a sound channel with an arbitrary sound velocity profile and multiple ray interactions with surface and bottom boundaries, but ultimately follows very closely their development.…”