The Technology Of Teminal Trajectory Correction Based On Combined Measurement And Image

In order to improve the firing accuracy to target and survival probabilities in battlefield, the technology of terminal trajectory correction is studied in this paper based on the combined measured method, applied in individual rocket. The technology makes use of CCD which is fixed in projectile as target detector and combines magnetometers and MEMS gyro to measure the projectile's attitudes, and then the trajectory error is calculated by microcomputer, and connect the trajectory by controlling small pulse motors at the end of trajectory at last. The technology not only can be used in individual rocket, but also in other artillery rockets and munitions.1. This paper expounds the system's composing and working principle of terminal trajectory correction munitions based on the combined measured technology and CCD. The principle detected target and accuracy of the image measured system and the error compensated method of MEMS gyro in attitude measured system are studied through analyzing to the three key sub-systems. According to the characteristics of projectile's motion, the projectile equations are built in this paper which can calculate the trajectory quickly and accurately. The trajectory of individual rocket is simulated by using of Simulink and 6-D equations.2. The method measured to target by CCD is studied in this paper. According to motion equations of projectile and the characteristics of imaging in CCD, the equations disturbed the relative motion between projectile and target is built and the method which is used to measure the relative position of target by CCD is studied in this paper. The measured error caused by the projectile rotation is analyzed. To test the above methods and equations, several experiments and simulations are designed. The results indicate that the relative positions of target can be measured accurately by the methods and equations.3. The method measured to projectile's attitudes is studied in this paper. According to the characteristics of individual rocket's motion, the attitudes measured model is built by using of B2AC and the projective geometry of geomagnetic vector in projectile coordinate. Through bringing several coefficients and UKF into B2AC, the improved B2AC is proposed which can calculated the attitude angle of projectile accurately when a part of the original data is not correct. A method is proposed which can measured the attitude based on the servo mechanism. The combine measured model is built using three-axes magnetometers and MEMS. To test the above methods and equations, several experiments and simulations are designed. The results indicate that the roll angle can be calculated accurately using improved B2AC, but the other two angles' accuracy is not very good while the combine measured model can compensate the shortage.4. To test the above models and methods, the experiment plan and detect system are designed. The test is finished to measure the attitude of projectile and the relative position between the projectile and target. The results show that the data is identical with the simulated data.5. The correct policy is studied in this paper. Using the trajectory error as correct parameter which can be calculated by the above models and methods, the trajectory equations which have been changed are built firstly, and then the correct policy is designed by use of optimized cybernetics. The influence of rotation to correcting is analyzed and the method to keep the projectile stabilized is proposed and the correct efficiency is calculated. Finally, the correct plan is designed and tested by simulation and experiments.