A.V. Popov - Dr.Sc. (Phys.-Math.), Head of Department, Pushkov Institute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation (IZMIRAN) (Moscow, Troitsk). E-mail: popov@izmiran.ru I.V. Prokopovich - Post-graduate Student Junior Research Scientist, Pushkov Institute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation (IZMIRAN) (Moscow, Troitsk). E-mail: prokop21@mail.ru

A model problem of impulse radio probing of horizontally-layered dielectric half-space is considered. The receiver antenna registers partial reflections from the interfaces and gradients of the subsurface medium. A time-domain version of the coupled-wave method (two-wave WKB approximation) is developed to describe the reflected signal. The approximate solution, constructed in a closed form, conforms to the exact solutions, radically speeds up the calculations, and explains the protracted reflected pulses observed in the lower part of the GPR frequency band.

 

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