提高零控脱靶量预测精度的一种方法

对于大气层外拦截问题中以零控脱靶量(ZEM-zero effort miss)作为指标的预测制导方法,其ZEM的预测精度直接影响到最终的拦截任务.在线性化平方反比引力模型下,给出了基于目标轨道坐标系的ZEM预测算法,导出ZEM发生条件,并提出一种提高ZEM预测精度的方法,即通过初值轨道角速率的选取可明显改善算法的预测精度.同时将该算法与地心赤道惯性坐标系下的ZEM预测算法进行了比较研究,数学仿真结果表明该预测算法精度较高,具有一定的工程应用价值.

A Method for Improving Prediction Accuracy of Zero Effort Miss

For the predictive guidance with zero effort miss(ZEM) taken as a performance objective for exo-atmospheric interception problem,the prediction accuracy of ZEM directly influences the completion of terminal intercept mission.In this paper,a ZEM forecasting method based on the target-centered orbit frame is introduced by using the linearized inverse square gravity model.The condition of ZEM occurrence is derived and one method for improving prediction accuracy of ZEM is also put forward,which can distinctly improve the prediction accuracy by choosing the initial orbit angular velocity.Moreover this method is compared with the one based on ECI frame by simulation.The results indicate that the improved one has higher accuracy and certain value to practical application.