A design of general magnetic guided automated guided vehicle（ AGV） sensor based on magnetoresistive sensor is introduced. According to magnetic field distribution of magnetic stripe used in AGV

a measurement solution using magnetoresistive sensing chip HMC1021 to form array is proposed

hardware circuit is designed. Quadratic function relationship between magnetic field intensity and chip calibration position is fitted by using output of magnetoresistive sensing chips in different calibration position

the lateral offset distance between center of magnetic stripe and sensor is obtained by calculation is proved by experiment accuracy of AGV sensor

and methods for decreasing error and improvement scheme are proposed.