Determination of the structure of the volume irregularities of a medium
Abstract
The scalar Helmholtz equation is used to solve inverse problems concerning the determination of the structure of the bounded irregularities of a medium according to the scattered wave field of a point source in the framework of the Born approximation and the method of smooth perturbations. The determination of the structure of the irregularities of the isotropic ionosphere from scattered radio waves is considered as an example. Formulas are presented which make it possible to determine the irregularity structure with a Rayleigh resolution limit according to the measured field in the Fresnel or Fraunhofer zones. Integral equations are derived whose solution can be used to determine the irregularity structure with a resolution above the Rayleigh limit.
- Publication:
-
Radiotekhnika i Elektronika
- Pub Date:
- October 1986
- Bibcode:
- 1986RaEl...31.1894G
- Keywords:
-
- Inverse Scattering;
- Ionospheric Propagation;
- Ionospheric Sounding;
- Radio Scattering;
- Born Approximation;
- Far Fields;
- Fresnel Region;
- Helmholtz Equations;
- Rayleigh Scattering;
- Geophysics