The Study On Attitude Algorithm And Terminal Trajector's Control Strategy For Low Speed Rolling Ammunition

At present impulse engines and canard are used for terminal trajector's control. As a key technology the capture of ammunition attitude information and control strategy is important . This paper based on low-cost MEMS gyro strapdown inertial navigation system and carries out a comparative analysis of the attitude algorithms studies the impulse control strategy and canard control scheme and the main results are as followsAccording to the characteristic of low speed rolling ammunition's movement discusses the mathematics model of MEMS gyro the rotation vector method was tried and a simulation about it was done using a low speed rolling ammunition's data. Though studying two-samplethree-sample rotation vector and quaternion the results showed that the rotation vector method works well and because it overcomes the unchangeable error happens when rigid body rotate it has a higher precision and better real-time compared to the quaternion's when the attitudes updating periods are the same or when the sampling periods are the same.It can be used for engineering of attitude calculation.According to the characteristic of impulse engines and canard, based on rigid body ballistics, found the dynamics model of control flight. On this basis raise pulse control strategy studies the rules between the stability control ability and the correction time the numbers of impulse engine the time interval obtaines control parameter calculation method. As for crossed canard's control gains the rules between the stability control ability and levator angles of the canard control height choose the better levator angles of the canard and control method . The result can provide basis for the control of the terminal trajectory.The above result can provide feasible theoretics and method for low speed rolling ammunition's terminal control which uses low-cost strapdown inertial navigation system.