| 摘要 |
PROBLEM TO BE SOLVED: To shorten an initial position calculation time, in a position calculation based on a positioning satellite signal.SOLUTION: In an initial position calculation without an ephemeris, a position calculation device 1 receives positioning support information superimposed on a quasi-zenith satellite signal transmitted from a quasi-zenith satellite 5, estimates a satellite orbit of a GPS satellite 3 on the basis of a position and a speed of the GPS satellite 3 included in the positioning support information, and calculates a position by using an ephemeris estimated from the estimated satellite orbit. |
