Method for one-dimension trajectory correction by self-determination with low cost

For the situation that the firing dispersion declines after the rocket-assisted mortar shell adopts the range-extended technology, through the statistics of the data that was obtained in the range test, all reasons that influence the range dispersion of the ammunition and its influence level was simulated and analyzed. It was concluded that the range error caused by the deviation of all parameters during the work of the engine accounts for 70 percent of total range error. Using the accelerometer to measure the axial acceleration of the projectile during the working period of the rocket engine was put forward and the real trajectory according to the acceleration results was calculated with established trajectory equation. The optimized startup time of the resistance force correction mechanism was determined after being compared with the pre-determined trajectory. The method with low cost and by self determination for correcting the trajectory comes out. Monte Carlo Method and the range test were performed to verify the feasible of this method. It was concluded that the range dispersion can be reduced by 40 percent or more after the trajectory was corrected. At the same time, it was proved that the zero drift of the accelerometer after the launching over-loading is the main reason that influences precision for the estimation of the trajectory and the prediction of the falling point, and it was indicated that when the range dispersion of the projectile is 1/300, the zero drift of the accelerometer should be less than 0.04 percent of the measurement range.