UPLINK SYNCHRONIZATION METHOD USING LOCATION OF SATELLITE TERMINAL AND NETWORK CONTROLLER

摘要

PURPOSE: An uplink synchronization acquisition method using the location information of a center station and a satellite terminal is provided to promote the efficiency of a satellite resource by minimizing the ranging slot of a satellite network. CONSTITUTION: A center station transmits control signals including satellite delay time and location information to a satellite terminal(S50). The satellite terminal creates the location information of the satellite terminal based on the control signal(S110). The satellite terminal estimates the satellite delay time(S130). The satellite terminal calculates a deviation between the estimated satellite delay time and the satellite delay time of the center station(S150). The satellite terminal corrects initial transmission timing for uplink synchronization according to the computed deviation(S170). [Reference numerals] (AA) Start; (BB) Finish; (S10) Satellite delay time(Tt) is measured from a primary outlet; (S110) Location information(Lt) of a terminal is generated; (S130) Satellite delay time of the terminal is estimated; (S150) Difference between Tt and Tn is calculated; (S170) First transmission timing of the terminal is set; (S200) Detailed synchronization of the terminal is adjusted by using the transmission and reception of the uplink synchronization signal; (S30) Location information(Ln) of the primary output is generated; (S50) Control signal is transmitted from the primary outlet to the terminal