基于碰撞概率的交会对接近距离导引段的轨迹安全

提出了一种利用碰撞概率思想来描述交会对接近距离导引段飞行器轨迹安全的方法,这种方法采用最大瞬时碰撞概率来定量描述两个飞行器的碰撞危险程度。推导了最大瞬时碰撞概率的计算公式,其过程可分为三步:首先基于CW方程外推初始相对状态和误差协方差矩阵,然后利用外推后的相对状态和误差协方差矩阵计算瞬时碰撞概率,最后求出感兴趣区间内的最大瞬时碰撞概率。数值算例表明最大瞬时碰撞概率是描述交会对接近距离段两个飞行器碰撞危险程度的一个较好的指标。

Collision Probability Based Trajectory Safety in Close Range Guidance Phase of Rendezvous and Docking

A method for describing the trajectory safety in close range guidance phase of rendezvous and docking is developed,that involves quantitatively analyzing the collision between two spacecrafts using the maximum instantaneous collision probability.The method calculating the maximum instantaneous collision probability is developed.The process calculating the maximum instantaneous collision is divided into three steps.Firstly the state and error covariance matrix are propagated based on CW equation.Secondly instantaneous collision probability can be calculated using the state and error covariance matrix propagated.Thirdly the maximum instantaneous collision is found in interested interval.Calculation results prove that the method based collision probability can describe the collision risk nicely.