| 摘要 |
PURPOSE: A positioning method is provided to perform stable and reliable positioning using map matching through code tracking and a vision system for compensating a problem of truncation of positioning due to cycle slip owing to an obstacle or decrease of accuracy in a global positioning system. CONSTITUTION: A positioning method monitors the number of satellites in real time(S100). If the number of satellites is greater than 4(S110), the method performs a PPP(Precise Point Positioning)(S200,S300). If the number of satellites is greater than 3(S210), the method calculates the location of a user(S300). If the number of satellites is less than 3, the method recognizes a coordinate from a specific object or a building in which a coordinate is preset using a vision system and performs positioning(S230,S300). [Reference numerals] (AA,BB,S310) Calculate a pseudo range; (CC,DD,S330) Correct a pseudo range; (EE,FF,S340) Calculate a user position; (S100) Monitoring the number of satellites; (S110) Number of used satellites >= 4; (S130) Number of used satellites = 3; (S140) Number of used satellites < 3; (S200) Performs PPP(Precise Point Positioning); (S210) Using map matching by code tracking; (S230) Using a vision system
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