Effects of overlying refractive index layers on the reception field of links within radio-optical line of sight over sea transmission
Abstract
The influence of refractive index layers on SHF line-of-sight propagation over sea above the evaporation duct is investigated by the theory of ray optics. A special type of refractive index profile composed of five layers is used, so that the differential equation of rays can be integrated without numerical treatment. The transmitter is assumed to be situated below the stratification. Computations of field strength as a function of receiving height show caustics, marked interference fading, and intensive defocusing of the ray beam which reaches the receiving antenna without reflections at the sea surface ('radar holes').
- Publication:
-
Kleinheubacher Berichte
- Pub Date:
- 1975
- Bibcode:
- 1975KlBer..18...27F
- Keywords:
-
- Field Strength;
- Marine Meteorology;
- Optical Paths;
- Radio Meteorology;
- Radio Relay Systems;
- Refractivity;
- Atmospheric Attenuation;
- Defocusing;
- Differential Equations;
- Numerical Analysis;
- Ocean Surface;
- Radio Antennas;
- Radio Reception;
- Radio Transmission;
- Signal Fading;
- Surface Roughness;
- Communications and Radar