An Analysis and Elimination of Zero Drift in Magnetic Gradient Tensor Exploration System

The magnetic gradient tensor exploration system (MGTES) has many advantages which can not be found in the magnetic total field and vector measurement system. So MGTES has become one of the main development directions of magnetic surveys. MGTES made by multi-fluxgate is born with the advantages of low-cost, low motion noise, portability and so on. But the system is constituted by multiple sensors. The consistency of sensors has a great influence on exploration or even results in failure. A prominent problem of consistency is that the fluxgate sensor produces a random zero drift when powered. We analyzed the influence of the zero drift in MGTES and proposed a method to eliminate the zero drift in the wild conveniently. The feasibility and practicality of the method were verified by theoretical simulation.