Patent ID: 6289279
Filing Date: 2001-09-11
Classification: G01C,G01S

Abstract:
A positioning system for obtaining information about a current position of a device, comprising:a radio-call base-station which sends data; anda positioning device including a receiving means which receives data sent from said radio-call base-station, and a first positioning means which obtains position data indicating a current position of the device based on data sent from said radio-call base-station, a secondary positioning means to obtain secondary position data by measuring the current position of the device based on signals sent from artificial satellites, and a reception-frequency-switching means to switch a reception frequency based on said secondary position data,wherein said radio-call base-station is equipped with a position-correction-data-generating means to generate position-correction data to correct said secondary position data, andwherein said secondary positioning means includes a position-data-correction means to correct said secondary position data using said position data sent from said radio-call base-station.