SWEEP-FREQUENCY, SPACED-STATION MEASUREMENTS OF ROUND-THE-WORLD HF PROPAGATION.
Final rept. 15 May 64-15 Aug 66,
STANFORD UNIV CA STANFORD ELECTRONICS LABS
Pagination or Media Count:
Spaced-station, synoptic, sweep-frequency measurements were made of hf round-the-world RTW propagation for a 12-month period in 1963-1964. The primary objectives were further determination of the degree of energy focusing after an RTW circulation and the azimuthal dependence of path loss. Pulse transmissions from Stanford, California, were simultaneously monitored at Stanford, Lubbock Texas, and Pullman Washington. RTW signals were most often received at Lubbock near winter noon and at Pullman near summer sunset, as predicted by use of simple ionospheric absorption theory. The energy was found normally to be focused in a region considerably smaller in width than 1400 km--and possibly as small as 400 km. The propagation-sector width was found to vary with time of day, frequency, and month. Typical inferred values of sector width for the system sensitivity being used were 30 deg in summer twilight and as great as 120 deg in winter midmorning. Author
- Electromagnetic Pulses
- Radio Communications