Abstract: The rapid and accurate impact-point prediction is a key to correct or guide a high-spinning projectile， and the impact-point prediction based on perturbation(PP) with base trajectory can balance the calculation efficiency and precision. As the parameters of the perturbation model cannot be calculated rapidly with the variation in environment and target, a method combining the perturbation theory and step approximation method is proposed to calculate the proper launching parameter and base trajectory quickly; and an equation of the model parameters which can be calculated by iteration is deduced to fast modeling under arbitrary destination and condition. Simulations and uncontrolled experiment were carried out to verify the feasibility of the proposed method. The results show that the base trajectory and perturbation model can be established. Compared with the modified point-mass trajectory (MPT) method, the predicted error of ascending trajectory of perturbation method is smaller and the predicted error of descending one is larger. Considering the characteristics of PP and MPT methods, a piecewise prediction method combining PP and MPT is proposed. According to the Monte Carlo simulation, the correcting effect of PW method is better than those of PP or MPT method. Key

Key words: ordnancescienceandtechnology, guidedprojectile, rapidimpact-pointpredictionmodeling, perturbationtheory, basetrajectorygeneration, piecewisepredictionmethod