There are works [1] considering the theoretical principles of radio waves propagation in above-water surface tropospheric waveguide, but till now a practical evaluation for methodical calculations of actual above-water surface tropospheric waveguides has not been carried out yet.

Therefore the purpose of the present paper is to describe a method allowing to determine not only a field in the middle of tropospheric waveguide, but a power of a signal reflected from a target being at low altitude in the middle of tropospheric waveguide as well.