红外低轨星座对弹道目标动态覆盖性能分析

Analysis on Dynamic Coverage Performance of Low Earth Orbit Infrared Constellation on Ballistic Target

对弹道目标主动段的覆盖是红外低轨星座的重要指标。提出一种红外低轨星座对弹道目标主动段的覆盖分析方法,该方法基于网格点覆盖分析的思路,将对全球区域的静态网格点覆盖分析和对特定区域的目标主动段覆盖相结合,在保持星座覆盖分析有效性的同时减少覆盖分析计算量。对该方法进行实例分析,验证了其有效性。根据实例覆盖分析结果,结合星座覆盖对主动段目标检测性能影响的分析,提出了覆盖间隙开始时间的指标,该指标可有效衡量红外低轨星座对弹道目标主动段的动态覆盖性能。

Coverage of boost phase ballistic trajectory is an important guideline of low earth orbit in- frared constellation. A method of constellation coverage in this case is presented, which expands the thought of grid point coverage method and combines the global areas grid coverage analysis and ballistic trajectory coverage analysis in dedicated areas, gaining the same efficiency while decreasing the compu- ting load. An example is presented and validates the efficiency of the method. Based on the results of coverage example and analysis of coverage＇ s influence for system detection performance, a new concept of coverage gap initiation is presented. The concept can efficiently evaluate performance of coverage of low earth orbit infrared constellation on boost phase ballistic trajectory.