Parameter calculating method, long-term prediction orbit data providing method, information providing device, and positioning system

摘要

A parameter calculating method includes: setting lengths of prediction target terms as divisions of a predetermined effective period of a satellite orbit as variable lengths; and calculating a parameter of a predetermined orbit model expression used for approximating the satellite orbit based on prediction position data containing prediction positions of a positioning satellite in time series for each of the prediction target terms.

主权项

1. A parameter calculating method comprising:
adjusting length of a prediction target term, the prediction target term being a sub-period of a predetermined effective period of a satellite orbit of a positioning satellite; and calculating a parameter of a predetermined orbit model expression for approximating the satellite orbit based on prediction position data containing time-series prediction positions of the positioning satellite, the adjusting of the length of the prediction target term including setting the length of the prediction target term based on difference between a past prediction position and a past actual position of the positioning satellite such that the length increases as the difference between the past prediction position and the past actual position becomes large.