基于不敏卡尔曼滤波平滑的再入弹头弹道系数提取

Extraction of Ballistic Coefficient of Reentry Warhead Based on Unscented Kalman Filtering Smoothing

再入弹头超高速再入大气层是典型的非线性过程,并且再入过程存在扰动。针对系统的扰动,采用时变的弹道系数模型,针对弹头再入过程的非线性,建立了基于不敏卡尔曼滤波平滑法来提取弹道系数的模型,与不敏卡尔曼滤波法相比,改善了再入段目标弹道系数的提取精度。

The experience of reentry heads reentering atmosphere is a typical nonlinear process, in which there is perturbation. Because perturbation exists, the time-varying model of ballistic coefficient is adopted; because of non-linearity, unscented Kalman filtering smoothing is adopted. Compared to unscented Kalman filtering, the new method improves the precision of ballistic coefficient extraction.