摘要: 　Aim　To study attitude measurementmethod of flight body and attitude measurement principle of the earth magnetic fieldsensor. To set up the attitude detecting maths model of the earth magnetic field sensor,and propose the flight body attitude calculating method.Methods Accordingto Faraday electromagnetism induction law, i.e. when a wire loop incises the magneticforce line of the earth magnetic field, it will bring about the induction electromotiveforce, an attitude measurement system was designed based on the earth magnetic fieldsensor. Results An earth magnetic field sensor and attitude measuringsystem were designed, and experiment data were analyzed and processed. It was proved thatthe rotating speed measurement error is 0.05r/s. Conclusion This earthmagnetic field sensor can be used to detect attitude of high-load rotating flight body.