扰动引力多核快速并行算法

Fast Parallel Algorithm for Multi-Core of Disturbing Gravity

程飞行器和弹道导弹的精确控制与导航会受到地球外部扰动引力场的影响,实践中常利用地球重力场位系数模型计算扰动引力矢量,但其计算效率随着所用模型阶次的升高而显著降低。针对这一问题,文中提出利用OpenMP并行算法快速计算轨迹点扰动引力矢量,在不损失精度的前提下有效提高了计算效率。通过数值实验可知,所提方法可以提高扰动引力矢量的计算效率,加速比达到6倍。这也为重力场元快速计算提供了参考方案。

The precise control and navigation of long-range aircraft and ballistic missiles is affected by the gravity disturbance outside the earth. In practice, the gravity disturbance vector is often calculated by the geopotential coefficient model, but its calculation efficiency decreases significantly with the increase of the order of the model used. In this paper, parallel algorithm based on OpenMP is proposed to calculate the perturbation gravity of trajectory points quickly, which can improve the calculation efficiency without losing accuracy. Results of simulation experiments show that the proposed method significantly improves the calculation efficiency of perturbed gravity, and the acceleration ratio is 6 times the value of that of the traditional method, which provides ideas for fast calculation of gravity field elements.