The Feasibility of a Sub-LF Satellite-to-Submarine Communication Downlink,VLF Noise Levels in the Ionosphere.

摘要

The electromagnetic noise environment of satellite-borne ELF,VLF and LF receivers was investigated. Noise data obtained from a number of satellite and rocket experiments (maximum altitude 3000km) have been reviewed and summarized. The intensity of whistlers,equatorial hiss,and man-made signals as a function of latitude,time of day and state of the ionosphere were examined and typical noise environment curves were presented. These data suggest that areas near the magnetic equator and over the polar cap provide the lowest ionospheric noise environment. (Author)