BDS卫星可用性评估

为评估BDS卫星可用性,基于可靠性原理,分析BDS星座MEO空间备份策略的影响因素,进一步根据BDS卫星发生故障的实际情况,分析了BDS卫星故障对单星可用性的影响。结果表明:在BDS的MEO备份卫星的轨道设计过程中,备份卫星轨道高差约束必须综合考虑轨道倾角容许漂移量和卫星平均中断时间间隔两方面因素;轨道机动对单星可用性的影响程度比单粒子翻转(恢复时间12 h、24 h)影响程度小,而且三种故障的综合影响比单方面因素的故障影响大。 

Availability Assessment of BDS Satellite

In order to evaluate the availability of BDS satellites and analyze the influence factors of BDS constellation MEO space backup strategy based on the reliability principle, the influence of BDS satellite fault on the availability of single satellite is analyzed based on the actual situation of BDS satellite. The results show that in the orbit design of BDS MEO backup satellites, the height difference constraint of the backup satellite orbit must consider both the orbital inclination allowable drift and the satellite mean interruption time interval. The effect of orbital maneuver on the availability of single star is smaller than that of single particle inversion (recovery time 12h, 24h), and the combined effect of the three faults is greater than that of unilateral factor.