Abstract: In allusion to some deficiencies of micro inertial sensors, of which the measuring error spreads with time and the measuring range can not meet the requirement of roll angle measurement of spinning projectile, the roll angle measurement of spinning projectile by using the magnetic sensors and its engineering implementation feasibility were researched. A mathematical expression was given for the magnetic sensors installed at the different angles and positions, and the attitude angles were calculated according to the ratio of extreme value of the two non-orthogonally installed magnetic sensors which has corresponding relationship with pitch angle. The condition of singularity and the feasibility of roll angle measurement using the magnetic sensors were analyzed, and the half size hardware-in-the-loop experiment was accomplished based on the sensor configuration and calculation method. The experimental results show that the resolved errors of pitch angle and roll angle can be controlled within the range of 1°, this measurement scheme can apply to the spinning projectile which has a small variety of yaw angle.

Key words: electromagnetics, geomagnetism, spinning projectile, magnetic sensor, roll angle