### ASA 124th Meeting New Orleans 1992 October

## 2pUW4. High-frequency scattering in the Arctic.

**Gary Steven Sammelmann
**

**
**
*Coastal Systems Station, Panama City, FL 32407-5000
*

*
*
There currently exists no high-frequency model of propagation in the
Arctic. This article describes a simple, fast model for computing
high-frequency propagation in the Arctic. This model is a one-parameter model
of scattering in the Arctic, where the free parameter of this model is the
average rms slope of the small-scale surface roughness of the ice canopy. This
model couples ray theory to a scattering strength formalism of scattering from
a rough surface. This coupling is achieved by associating an effective area of
ensonification with each ray trajectory from the source to the receiver. The
average intensity at the receiver is obtained by performing an incoherent
summation over all possible ray trajectories from the source to the receiver,
including nonspecularly scattered rays. A comparison between model predictions
and experimental measurements of forward scattering is made. The model predicts
the overall shape and amplitude of the scattered signal within 5 dB depending
upon the range of the source to the receiver.