Subsurface Layered Media Parameter Estimation Using a Linearized Multiple Reflection Model

The purpose of this paper is to address the problem of determining the geometry of subsurface sediment layers and rock strata. This has considerable importance in diverse activities in the ocean environment. We use a multiple - reflection model that gives the mathematical description of the effects of layered media on the response to implusive type acoustic excitations in the water. The parameters of the model are propagation delays and reflection/transmission coefficients at the boundaries between layers. Least squares criteria are employed in estimating parameters such that the response of the model shows good correspondence with field data. In the present paper we apply a linearization procedure to the composite pulses to accommodate the inherent time delay phenomena. Efficient estimators developed and computational experience related to field data studies performed are discussed.