Differential Doppler Signal Investigation and Its Application to the Analysis of the Ionospheric State and Variation

摘要

Total electron content (TEC) of the ionosphere is one of the parameters of solar terrestrial environment necessary for man-made satellite working system such as the range and speed measuring, radio-location, telemetry and telecontrol, remote sensing, navigation, telecommunication, television relay, satellite meteorological map, etc. The spatial structure, temporal variation and their auto-and cross-correlations of the ionospheric TEC are important influential factors in radio star-earth system. This kind of essential radio propagation factors has been paid great attention by the practical departments and scientific research centres during the past 40years since 1957.