GRO和LRO掩星事件模拟研究

Simulation Study on GRO and LRO Events

GRO(Global Navigation satellite system Radio Occultation)和LRO(Low Earth Orbit Radio Occultation)联合组网探测地球大气是无线电掩星探测技术的主要发展方向.本文根据掩星事件的数学判据,仿真分析了LEO卫星主要轨道参数对CRO和LRO掩星事件数量和全球分布情况的影响.研究表明:卫星轨道越低GRO掩星事件越多:轨道倾角在30°和75°之间时,GRO掩星事件较多.全球覆盖率也较大;利用极轨卫星进行LRO掩星探测时.LRO掩星事件较均匀地分布在各纬度带.研究成果对GRO和LRO联合星座设计具有参考价值.

Combining the GRO （Global Navigation Satellite System Radio Occultation） and LRO （Low Earth Orbit Radio Occultation） techniques to probe the Earth＇s atmosphere is a main devel- opment direction of RO （Radio Occultation）. In this study, the mathematical criteria of a RO event have been described. Then the effects of the main orbit parameters of LEO satellite on the RO events amount and their global distribution have been discussed by a simulation study. The results showed that： the lower the LEO satellite orbit is, the more GRO events are; when the inclination is between 30° and 75°, there are more GRO events and their Earth coverage is higher. The LRO events distribute on the Earth evenly when the LEO-LEO RO satellite set in the polar orbits. Thisstudy can provide a scientific reference for GRO and LRO satellite constellation design.