IONOSPHERIC WAVEGUIDE DUCTS FOR LONG-RANGE RADIO COMMUNICATION BELOW THE MAXIMUM OF THE F SUB 2 LAYER,
FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO
Pagination or Media Count:
The waveguide theory approach to the propagation of radio waves explains 1 the slow drop of the satellite field intensity at a long distance from the receiving point, 2 the antipode effect in the earth-ionosphere waveguide and 3 the reception of signals from a satellite on the surface at frequencies higher than MVF. For above-surface waveguides in the far zone, the field intensity is determined by signals whose paths are located above the strongly absorbing ionospheric layers. Conditions for the lower end of the ultrashort-wave band are especially favorable because for this band the waveguide is located in the region of the maximal electron-concentration gradient in the F2-layer. The stability of the F2-layer in respect to various geophysical factors leads to the assumption that there is a continuous ionospheric duct which permits communication over large distances.
- Radiofrequency Wave Propagation
- Radio Communications