Based On Magnetoresistive Sensors To Determine The Projectile Flight Orientation Modeling Experiments

Rocket Gliding Extended Range Technology is an effective way to achieve ammunition extended range, in which one of the key problems is the measurement of the flight attitude for the projectile's roll angle and pitching angle will provide real-time information for the guiding system in intelligent projectiles to assure of the accuracy of projectile's attitude control and navigation. Due to projectile's high rotating speed, the current rotation speed measurement equipment can't sustain the high overload. The bulk of traditional measurement system is another disadvantage. Therefore, we make the modeling and experiment of the projectile's attitude angle measurement based on the magneto resistive sensor in this paper.We first introduce the geomagnetic field formation mechanism, function characteristic, common geomagnetic field computation model and the gliding trajectory characteristics of the gliding flight extended range. Then based on the magneto resistive sensor theory, we discuss its vertical effect and magnetic filed response in the plane vertical to the sensitive axel. Then we establish the mathematical computation models of roll angle and pitching angle with the yaw angle ignored based on geomagnetism and ballistics theory. Finally, we get the data from the projectile data acquisition system to test the correctness of the former mathematical computation model. The experiment results show the feasibility of this method using magneto resistive sensor to measure projectile's roll angle and pitching angle.