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

Claim 0:
1. An information processing device capable of being carried by a subject, the information processing device comprising:
an antenna configured to receive positioning signals for a positioning process from navigation satellites; and
at least one processor configured to:
acquire, based on the received positioning signals, actual ephemerides that are actual orbital information on the navigation satellites;
acquire predicted ephemerides that are predicted orbital information on the navigation satellites and have a predefined expiration time;
before the predefined expiration time, determine whether 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
execute an actual ephemeris acquiring operation that is based on the positioning signals received when determination is made that the remaining period until the predefined expiration time is the determination period or shorter, and determine a position of the subject based on the positioning signals and the actual ephemerides acquired through the actual ephemeris acquiring operation.