摘要
针对航天器再入返回过程中地面覆盖区进入国境内部分面积及面积占比的快速估计问题,给出了一种考虑球面形状的纬线分割扫描算法。通过将传统的经纬度二维方向划分算法降维处理,仅在纬线方向上进行分割,并扩展到球面上,实现了覆盖区相交部分面积及面积占比的快速估计,并对算法进行了仿真计算验证。结果表明:对给定的算例,计算耗时控制在0.4 s以内,面积占比的误差在0.2%以内,方法可行,且满足实时性要求。
To realize the real-time rapid calculation of the landing footprint area of the re-entry spacecraft entering the appointed region,a latitude cutting and scanning calculation method considering the spherical shape was proposed.Through the traditional latitude and longitude two-dimensionality reduction,the division method was only performed in the latitude direction and extended to the sphere,which realized the rapid area estimation of the intersecting part of the landing footprint and the area proportion.Then the algorithm was verified by simulation calculation.The results showed that the calculation time was controlled within 0.4 s,and the error of the area ratio was within 0.2%,for the given examples.The method is feasible and could meet the real-time requirements.
作者
淡鹏
何雨帆
陈俊收
DAN Peng;HE Yufan;CHEN Junshou(State Key Laboratory of Astronautic Dynamics,Xi’an 710043,China;Xi’an Satellite Control Center,Xi’an 710043,China)
出处
《载人航天》
CSCD
北大核心
2021年第4期474-479,共6页
Manned Spaceflight
基金
国家自然科学基金(11772356)。
关键词
再入覆盖区
多边形
实时
球面三角形
快速算法
landing footprint
polygon
real-time
spherical triangle
rapid calculation method
