The ground mark based on sound detection principle has been development trends of pipeline technology

aiming at present problem that the pipeline marking difficulties and low measurement precision

a new MEMS vector sensor which has advantages of high sensitivity

good characteristic of low frequency performance

lower power consumption

is put forward. And aiming at situation that the port / starboard blur problem

a new scheme is put forward

through theoretical analysis and experimental verification

it is concluded that the scheme is correct. The result of the experiment shows that directional angle average error is within 5°

which meet the need of engineering project.