Reduction and even elimination of crosstalk error due to external interference current by the sensor array and corresponding algorithms is an important issue of current measurement technology of in the research of magnetic sensor. In this paper

a kind of double-layer annular sensor array topology is proposed after comparing the existing typologies

and the measurement error is performed by simulation calculation and experimental measurement. In the simulation and calculation

the influence of such factor as amplitude

phase

distance of the interference current and the deviation of the measured conductor on the measurement error is compared. The current sensor is fabricated by using eight high-sensitivity TMR elements and tested under single and multi-condctor interference. The experimental results show that the average error of the current sensor is about 1.79%

which reduces by about 7% compared with the single-layer four sensors method.The topology proposed in this paper

compared with other typologies

has strong anti-interference ability. The function can be achieved not by complicated algorithm but basic calculation circuit. Therefore

it has strong practical value.