Position Guarantee Server, Position Guarantee System, And Position Guarantee Method

摘要

To obtain highly reliable position guarantee that makes it difficult for data to be tampered with and allows a prompt response. A position guarantee server includes: a communication section that receives from a positioning terminal transmission data including encoded data of a positioning code and a carrier wave from a positioning satellite by using the identification code of the positioning terminal itself; a decoding section ( 23 ) that stores the identification code of the positioning terminal and decodes the transmission data by using the identification code; a position computing section ( 24 ) that computes the position of the positioning terminal based on the positioning code decoded and the carrier wave decoded by the decoding section; and a certificate generating section ( 22 ) that certifies position information that is obtained by the position computing section. The certificate generating section certifies the position information by the position computing section upon receipt of a position guarantee request from the positioning terminal.