Positioning system, information provision device and terminal device

Abstract

The invention provides an information providing device providing a positioning system of satellite predictive position information with long period of validity compared with track information loaded on satellite signals. The information providing device comprises a satellite track information obtaining device obtaining satellite track information showing position information satellite and others; a satellite initial speed information generating device generating satellite initial speed information according to the satellite track information; a satellite initial position information generating device generating satellite initial position information according to the satellite track information; a physical quantity information effecting acceleration memorizing device memorizing physical quantity information showing satellite acceleration effecting the position information; a satellite acceleration information generating device generating satellite acceleration information showing the position information satellite acceleration according to the satellite initial speed information, the satellite initial position information and the physical quantity information effecting the acceleration; a satellite predictive position information generating device generating the satellite predictive position information according to the satellite initial speed information, the satellite initial position information and the satellite acceleration information.

Description

technical field [0001] The present invention relates to a positioning system, an information providing device, and a terminal device based on a position-related signal from a position information satellite. Background technique [0002] At present, a positioning system for positioning the current position of a GPS receiver using a satellite navigation system using position information satellites, such as GPS (Global Positioning System: Global Positioning System), is put into practical use. This positioning system has a positioning method in which a GPS receiver acquires assistance including orbit information (hereinafter referred to as orbital ephemeris (Ephemeris)) carried on satellite signals transmitted by each GPS satellite from an external assistance server. data, and use the assistance data to perform positioning based on satellite signals from each GPS satellite (hereinafter referred to as assistance type) (for example, Patent Document 1). [0003] In such an auxilia...

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Problems solved by technology

[0005] However, in the above-mentioned assisted positioning system, even if the GPS receiver saves the orbit ephemeris obtained from the auxiliary server, because the valid time of the orbit ephemeris is about four hours, there is such a problem that when obtaining the orbit When positioning after four hours of ephemeris, it is necessary to communicate with the auxiliary server, so the time and communication cost for this communication are often required

[0006] In addition, when positioning is performed after the effective period of the orbital ephemeris has elapsed, the orbital ephemeris cannot be obtained if the communication with the assistance server cannot be performed, so the predicted position of each GPS satellite cannot be quickly calculated, so there is still time required for positioning long question

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