Method for transmitting downlink signal and method for processing downlink signal

Abstract

The embodiment of the application provides a kind of sending method of downlink signal and the processing method of downlink signal, downlink signal is obtained based on supplementary synchronization sequence in satellite side, then downlink signal from satellite is used to carry out time-frequency synchronization in terminal equipment side.In the present application, terminal equipment does not need to obtain satellite ephemeris information and does not need to use GNSS device to realize time-frequency offset tracking compensation, eliminate the influence of ephemeris error and GNSS error on time-frequency synchronization performance after terminal equipment is powered off for a long time, solve the problem that the precision of time-frequency offset tracking compensation in the process of satellite-ground communication in the related art is not high, improve the time-frequency synchronization success rate of satellite-ground communication under ephemeris inaccuracy and high-speed state.

Images