Selected Research Program of the Office of Naval Research at the Center for Wave Phenomena, Colorado School of Mines.
Abstract
This is a progress report on the current status of the research program of the Center for Wave Phenomena at the Colorado School of Mines. There have been two major research projects in inverse scattering under the Selected Research Opportunities Program. The first of these is reflector imaging for seabed mapping and seismic exploration. The second is ocean profile inversion. (1) Our research group is committed to the practical solution of inverse problems. Sullivan's modeling technique will be used to generate synthetic data for testing of inversion algorithms. Direct modeling of this sort is also used to test the output of migration and inversion algorithms on real data. (2) The second research project studies ocean soundspeed profile inversion, in the case of a soundspeed which is dependent on depth, only. This inversion problem is fundamentally different from the seismic problem. The source(s) and receiver(s) are separated laterally while the variation being sought is a function of the vertical variable, nearly orthogonal to the ray paths of propagation of the signals. An integral equation for the perturbation of the soundspeed from a reference speed is formulated. The inversion of the integral equation actually provides a solution for n'(z) rather than for n(z). The solutions obtained to date by this method, properly locate the perturbation. However, n'(z) exhibits an overshoot of the type usually associated with Gibbs phenomenon. Methods of integration of n'(z) which minimize this affect are presently being investigated.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 1985
- Accession Number
- ADA161040
Entities
People
- Frank G. Hagin
- Jack K. Cohen
- John A. Desanto
- Norman Bleistein
Organizations
- Colorado School of Mines