Patent ID: 11933904
Assignee: CASIO COMPUTER CO., LTD.
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 7:
8. A positioning method for an information processing device carried by a subject, the positioning method comprising the information processing device at least performing:
acquiring, by at least one processor, based on positioning signals for a position process received by an antenna of the information processing device from navigation satellites, actual ephemerides that are actual orbital information on the navigation satellites;
acquiring, by the at least one processor, predicted ephemerides that are predicted orbital information on the navigation satellites and having a predefined expiration time;
before the predefined expiration time, determining, by the at least one processor, a remaining period until the predefined expiration time is a determination period or shorter, the determination period being set to at least a maximum term during which the subject is expected to be in a certain state, wherein the determination period is shorter than a period of validity of the predicted ephemerides and longer than a period of validity of the actual ephemerides; and
executing, by the at least one processor, an actual ephemeris acquiring operation that is based on the positioning signals received after determining that the remaining period until the predefined expiration time is the determination period or shorter, and determining a position of the subject based on the positioning signals and the actual ephemerides acquired through the actual ephemeris acquiring operation.