航天器返回可达区域国土占比快速计算方法  

Rapid Calculation Method of the Area Proportion of Spacecraft Recovery Footprint

作　　者：淡鹏 姜宇[1,2] 李恒年 DAN Peng;JIANG Yu;LI Hengnian(State Key Laboratory of Astronautic Dynamics,Xi'an 710043,China;Xi'an Satellite Control Center,Xi'an 710043,China)

机构地区：[1]宇航动力学国家重点实验室,西安710043 [2]西安卫星测控中心,西安710043

出　　处：《航天返回与遥感》2022年第3期25-32,共8页Spacecraft Recovery & Remote Sensing

基　　金：国家自然科学基金(11772356)。

摘　　要：文章针对航天器再入返回地面过程中可达区进入国土区域部分的面积与整个可达区面积比值的实时快速计算问题,在传统平面图形算法的基础上,给出了考虑球面形状和再入可达区凹凸特性的三种计算方法:球面网格分割算法、球面纬线扫描统计算法、球面三角划分算法,对这三种算法的原理及实现过程进行了阐述,比较了三种算法的优缺点。实验结果表明,文章采用的三种算法均是可行的,三种算法原理区别明显,都有一定的优缺点,球面网格分割算法、球面纬线扫描统计算法精度低于球面三角划分算法,但较球面三角划分算法更易理解和实现,球面纬线扫描算法可达到与网格分割算法相同的精度,而耗时与之相较大大降低。研究结果对再入可达区或落点散布区的相关计算有一定参考意义。For the real-time rapid calculation of the area proportion between the landing footprint area entering the appointed region and the entire one during the reentry and recovery process of the spacecraft,three calculation methods considering spherical shape and the concave and convex characteristics of the reentry landing footprint are given:spherical mesh segmentation algorithm,spherical latitude scan statistics algorithm,and spherical triangulation algorithm,based on the traditional plane graphics algorithms.The principles and implementation processes of these three algorithms are expounded,and the advantages and disadvantages are compared.The experimental results show that the three algorithms used in the paper are all feasible,but they are quite different in performance and complexity,and the principles are obviously different.The first two algorithms have the problem that the precision is lower than the third one,but they are easier to understand and implement than the third one.The spherical latitude scan statistics algorithm can achieve the same accuracy as the spherical mesh segmentation algorithm,but its time consumption is greatly reduced.These research results have certain reference significance for the related calculation of reentry landing footprint area.

关 键 词：再入可达区 面积占比计算 多边形 球面三角形 航天返回 

分 类 号：V556.4[航空宇航科学与技术—人机与环境工程]