阻尼片横向弹道修正的落点预测方法

Impact Point Prediction Method for Lateral Trajectory Correction With Spin Brakes

为了减小旋转稳定弹的横向落点散布,对一种采用阻尼片调节弹道偏流的横向修正方案进行了研究。实现横向弹道修正的核心是落点预测,故对该横向修正方案的原理及有效性进行了分析,由此提出落点预测模型应满足的要求。针对无控弹道的升弧段和降弧段,分别推导出相应的弹道解析预测模型,并通过考虑弹丸的动力平衡角和转速特性,建立了一个可计及阻尼片作用的三自由度弹道模型。经后处理的炮射试验数据验证以及不同条件下的弹道仿真,结果表明,该横向弹道落点预测模型在线计算量较小,预测误差约为20m,可满足工程应用中对落点预测模型计算速度和精度方面的要求。

To reduce the lateral dispersion for spin-stabilized projectiles,a type of scheme for lateral trajectory correction was studied,which modulated the ballistic drift by using spin brakes.It is essential for lateral trajectory correction to predict the impact point.Aiming at this problem,the principle of lateral trajectory correction with modulating ballistic drift and its effectiveness were analyzed,and the requirements for impact point prediction were proposed.For uncontrolled trajectories,the analytical impact point prediction models were obtained for up-leg and down-leg respectively.A suitable 3-Degree-of-Freedom point mass trajectory model taking the action of spin brakes into account was established by considering the influence of yaw of repose and spin rate.The results of the flight test data verification and trajectory simulation at different conditions indicate that the impact point prediction model proposed by this paper possesses small on-line computational burden,and the error is about 20 mcompared with test data,which meets the requirement of on-line rapidness and accuracy in practical engineering.