Third rail position detection method and system

The invention discloses a third rail position detection method and system, and the method comprises the steps: respectively collecting the contour data of a third rail, the contour data of a first steel rail, and the contour data of a second steel rail, the contour data of the first steel rail comprises two contour scanning data located below the rail surface of the first steel rail; the first steel rail is close to the third rail; determining a track plane based on the contour data of the first steel rail and the contour data of the second steel rail; determining a central point of the third rail based on the contour data of the third rail; calculating a guide height value of the third rail based on the rail plane and the center point of the third rail; and calculating the pull-out value of the third rail based on the contour data of the first steel rail, the central point of the third rail and the rail plane. According to the invention, the accuracy of third rail position measurement ...