NATURAL COMMUNICATIONS STUDY PHASE I, FEASIBILITY STUDY ON A RELIABLE POLAR HF COMMUNICATIONS SYSTEM
AVCO CORP WILMINGTON MA RESEARCH AND ADVANCED DEVELOPMENT DIV
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To establish methods by which propagation modes and field strength losses can be found, a number of formulations are developed. These are evaluated using vertical-incidence radio measurements. Also, some experimental data on a test propagation path is analyzed. The observed values are in excellent agreement with the expected ones. Analysis is made of several ionospheric parameters. Analyses for a large number of disturbances in absorption, sporadi E, and F2-layer critical frequencies are given. Data on HF equipment and systems is presented. A completed system is presented for which the maximum possible reliability is found in an example situation. A traffic load is assigned to a hypothetical network during the height of a polar cap absorption event. The results show that communication can be maintained during the event, but at a reduced level.
- Operations Research