地球外部引力场引起卫星间距离变化的数值模拟研究

Relationship Between Earth Gravity Field and SST by Numerical Simulation

卫星跟踪卫星 (SST)被认为是解决目前地球重力场探测领域中所面临一系列问题的有效方法之一。随着CHAMP、GRACE等SST卫星重力任务的实施 ,卫星跟踪卫星方法已经进入实用阶段。以GRACE卫星重力计划为参照 ,利用数值模拟方法研究了由于地球外部引力场导致的卫星间距离变化的规律 ,得出了相应结论。本研究方法和结论可以为进一步的研究工作 。

Satellite-to-satellite tracking can provide a new technique for the earth gravity field determination. To discover the relationship between the earth gravity field and SST observation, the basic research of SST simulation, JGM-3 and EGM96 are adopted and some numerical simulations are put in practice. The variations of SST observation are compared with the different degree and order and two earth gravity models JGM-3 (8×8, 36×36, 50×50, 70×70) and EGM96 (70×70, 100×100, 150×150, 180×180, 200×200, 250×250, 300×300, 360×360). In these simulation results, the higher degree and order earth gravity model can provide better simulation results. At the same time, the results simulated by the two different models have obvious biases.