Positioning system, terminal apparatus, method of controlling terminal apparatus, program for controlling terminal apparatus and computer-readable storing medium for storing program for controlling terminal apparatus

摘要

A positioning system includes: a terminal apparatus capable of receiving a satellite signal, which is a signal from a positioning satellite; and a communication base station capable of communicating with the terminal apparatus, wherein the communication base station including communication signal sending means for sending a communication signal including base station position information indicating a position of the communication base station and sending direction information indicating a sending direction from the communication base station, and the terminal apparatus including: communication signal receiving means for receiving the communication signal from the communication base station; base station information obtaining means for obtaining the base station position information and the sending direction information from the communication signal; base station pseudo distance information generating means for generating base station pseudo distance information indicating a distance between the communication base station and the terminal apparatus on the basis of an arrival delay time that the communication signal takes to arrive at the terminal apparatus from the communication base station; satellite orbital position information generating means for generating satellite orbital position information indicating a position in an orbit of the positioning satellite on the basis of the satellite signal from the positioning satellite; satellite pseudo distance information generating means for generating satellite pseudo distance information indicating a distance between the positioning satellite and the terminal apparatus on the basis of an arrival delay time that the satellite signal takes to arrive at the terminal apparatus from the positioning satellite; candidate position information generating means for generating candidate position information shown by a circle of a set of intersections between a spherical surface whose radius is a distance indicated in the base station pseudo distance information from the position of the communication base station indicated in the base station position information and a spherical surface whose radius is a distance indicated in the satellite pseudo distance information from the position of the positioning satellite indicated in the satellite orbital position information; and positioning location information generating means for designating one position out of positions on the circumference indicated in the candidate position information on the basis of the sending direction information to generate positioning location information.