Near-field to far-field projection algorithm for free-field or buried scatterer

Area of Science:

• Electromagnetics and Acoustics
• Computational Physics
• Wave Propagation

Background:

• Near-field to far-field transformation is crucial for characterizing scattering objects.
• Accurate modeling of buried scatterers presents unique challenges due to environmental interactions.
• The method of superposition offers a flexible approach for approximating complex fields.

Purpose of the Study:

• To develop and generalize a near-field to far-field projection algorithm.
• To adapt the algorithm for both free-field and buried scatterer scenarios.
• To validate the algorithm's performance using numerical data.

Main Methods:

• Application of a near-field to far-field projection algorithm.
• Utilizing the method of superposition with point sources to approximate scattered fields.
• Determining source strengths via boundary condition satisfaction on the measurement surface.
• Employing a two-domain Green's function expressed as an integral over special functions for buried scatterers.

Main Results:

• The algorithm successfully projects near-field data to the far-field for free-field structures.
• The generalized algorithm effectively handles buried scatterers.
• Numerical tests confirm the accuracy and applicability of the developed method.

Conclusions:

• The presented algorithm provides a robust framework for near-field to far-field transformation.
• The generalization to buried scatterers enhances its practical utility in diverse environments.
• This approach offers an efficient computational tool for electromagnetic and acoustic scattering analysis.