Accurate ground positioning method for buried optical fiber

The invention discloses a buried optical fiber ground accurate positioning method. The method comprises the following steps: step 1, establishing a three-dimensional coordinate system XYOZ; step 2, sequentially exciting vibration at each excitation point; step 3, reading the relative distance between the receiving points from the DAS demodulator; 4, calculating the distance between the excitation point and the receiving point; step 5, obtaining the distance between all the excitation points and each receiving point; 6, calculating the three-dimensional coordinates of the receiving point; and step 7, obtaining the three-dimensional space coordinates of all receiving points read in the step 2, and completing accurate positioning of the optical fiber. According to the positioning method disclosed by the invention, the vibration signal is not influenced by other media near the optical fiber, and accurate positioning of the plane position and the burial depth of the optical fiber near the metal and non-metal pipel