Sky wave large-scale MIMO uplink synchronization method using position information

The invention discloses a sky wave large-scale MIMO uplink synchronization method using position information, comprising the following steps: a base station side broadcasts and sends a downlink synchronization signal, and a user side receives the downlink synchronization signal from the base station; the user side calculates an initial position of a downlink data frame according to the downlink synchronization signal; the user side calculates and obtains the shortest propagation path distance according to the position information of the user side and the position information of the base station, and obtains the user wireless link round-trip transmission minimum relative time delay according to the shortest propagation distance; the user side adjusts the uplink frame sending time according to the obtained initial position of the data frame and the downlink relative time delay; the base station side feeds back user timing advance information to the user side according to the received uplink synchronization sequ