Patent ID: 8023960

Claim:
A positioning method comprising: generating at a terminal a geostationary-satellite (GS) synchronizing frequency to receive a geostationary-satellite signal, the geostationary signal being transmitted from a geostationary-satellite on a geostationary-satellite frequency; receiving at the terminal the geostationary-satellite signal on a geostationary-satellite (GS)-receiving frequency; calculating at the terminal a geostationary-satellite and terminal (GST) frequency difference, the GST frequency difference being a difference between the GS-receiving frequency and the GS-synchronizing frequency; obtaining at the terminal a GS ratio, the GS ratio being a ratio of the GST frequency difference to the geostationary-satellite frequency; generating at the terminal a base station (BS)-synchronizing frequency to receive a base-station signal from a communication base station, the base-station signal being transmitted on an official frequency of the communication base station; receiving at the terminal the base-station signal on a BS-receiving frequency; calculating at the terminal a base station and terminal (BST) frequency difference, the BST frequency difference being a difference between the BS-receiving frequency and the BS-synchronizing frequency; obtaining at the terminal a BS ratio, the BS ratio being a ratio of the BST frequency difference to the official frequency; generating at the terminal a BS frequency error ratio by adding the GS ratio and the BS ratio, the BS frequency error ratio being a ratio of a BS frequency error to the official frequency of the base-station signal, the BS frequency error being a difference between the official frequency and a frequency of the base-station signal; transmitting the BS frequency error ratio from the terminal to the communication base station; transmitting the BS frequency error ratio from the communication base station to a positioning device; and calculating at the positioning device a position of the positioning device by receiving a satellite signal on a frequency accounting for the BS frequency error.