卫星星座的空域覆盖性能计算模型

Computation Model of Constellation Space Coverage Performance

空域覆盖性能计算是星座覆盖性能分析的重要组成部分。分析了星座的关注区域，参考美国的SMTS系统，归纳了空域覆盖性能的主要影响因素；提出了Walker—delta星座最小覆盖重复周期的简化计算，以及基于最小覆盖重复周期内的经纬度覆盖等效性，这两方面可为空域覆盖性能计算中的仿真时间界定和空间采点提供依据；最后举例详细阐明了星座空域覆盖性能的基本特征．并基于此得出星座空域覆盖性能的评价角度，以此作为星座空域覆盖特性的本质表现。

Space coverage performance computation plays an important role in study of the coverage performance of a given constellation. First, satellite constellation＇s observation region is analyzed and the main influence factors on space coverage performance are summarized taking the SMTS system of the USA as an example. Second, based on the view-field-prick concept, simplified computation of the Walker delta constellation＇s minimum coverage repeated period is introduced and the constellation＇s coverage equivalence on longitude and latitude during the minimum coverage repeated period is applied as a support to determine the simulation time and space sampling points in coverage performance computation. Finally, the basic characteristics of space coverage performance are explicitly discussed with an example, based on which the iudgment approaches are illuminated and are taken as an essential representation of constellation space coverage performance.