Height Profiles of Transpolor VLF/LF Signals.
Final rept. 1 Dec 78-1 Jan 82,
PACIFIC-SIERRA RESEARCH CORP LOS ANGELES CA
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Airborne trailing-wire antennas assume a nearly horizontal orientation during high-speed operations, causing most of the radiated energy to propagate in the transverse-electric TE mode. Such TE signals can be exploited for very-low frequency VLF and low-frequency LF air-to-air communications. The Defense Nuclear Agency and the Rome Air Development Center plan to measure the excitation and transpolar propagation of VLFLF signals under normal ionospheric conditions and during solar proton events SPEs, which simulate aspects of certain nuclear environments. Measurements will also be made of transverse magnetic TM signals, in order to compare their behavior with that of the TE signals. The measurements will be made at altitudes between the ground and lower ionosphere with rocket-borne receivers, launched from Thule, Greenland. The report presents calculated TE and TM signals at Thule for the ground-based and airborne transmitters to be monitored. The results can be used to specify the required receiver sensitivity and to predict transpolar TETM link performance under diverse ionospheric conditions.
- Atmospheric Physics
- Radiofrequency Wave Propagation
- Radio Communications