The ground marker is an important part of pipeline on-line inspection system

using this system can realize precise localization of pipeline defect.Accurate localization is an important guarantee for the pipeline when the detection device is blocked on the pipeline.Based on this

innovative ground marking system based on micro acoustic vector sensor is put forward.Firstly

application of soil environment is analyzed

and then combine with the fast propagation characteristics in soil

optimal design on micro acoustic vector sensor is carried out

and the orange petal type packaging structure is proposed and the sensitivity is 60mV/gn.The direction of pipeline can be determined by the pipe pile in advance

thus

it can achieve positioning for the inspection device.Simulation experiment shows that the average error of the sound source target direction is less than 5°.