M.F. PROPAGATION:a wave-hop method for ionospheric field-strength prediction

摘要

A new method for calculating the strength of medium-frequency sky-wave signals at night is described. Estimated losses due to all the ionospheric and terrestrial factors which affect a wave as it propagates from transmitter to receiver are subtracted from the field strength which would arise if losses were absent. This process is carried out for each propagation mode which is likely to make a significant contribution to the received signal;the contributions are then added on a power basis. The method is intended for world-wide application and for paths of any length. Field strengths pre¬dicted by this method for 152 paths in different parts of the world have been found to agree reasonably well with measured values.