星座覆盖性能数值仿真

NUMERICAL SIMULATION OF COVERAGE PERFORMANCE FOR SATELLITE CONSTELLATION

星座对地覆盖性能要求是进行星座设计的主要依据。根据视函数法和地心法 ,建立了星座覆盖性能评定的数值仿真方法。以 GPS为例 ,对其覆盖性能指标进行了仿真。给出了GPS星座的视函数图 ,累积出覆盖统计特性 ,并且评价了覆盖质量。另外对 GPS星座的相位以及降级情况 (一颗或几颗卫星损坏 )下的覆盖质量进行了分析。最后对两种方法的仿真结果进行了分析比较。

In satellite constellation design, the most important factor is to satisfy requirement of coverage performance. According to the principle of visibility function and the method of earth center, numerical simulation approach is built.Two different numerical simulation models of coverage performance are developed. GPS visibility function picture and coverage performance are obtained, and coverage quality is evaluated. In addition, the phase and the coverage quality of degraded GPS (one or more satellites in constellation were damaged) have been analyzed. As a result, the present work may be to provide a good guideline for the design of satellite constellation.