Electromagnetic Conductivity Profile estimation by Quasi-Global Restarting Techniques of Local Newton-Like Methods.

摘要

This report presents a multistart technique of an inverse electromagnetic propagation computer program. The program calculates conductivities and layer depths in a horizontally stratified environment. The problem is formulated as a nonlinear least-squares problem, and to obtain a good solution for a quasi-global optimization technique is implemented. A local method is used and combined with a multistart technique so several solutions are obtained and the best solution may then be chosen. The program is then used to analyze some synthetic and some measured data.