摘要
使用GRACE卫星星载GPS观测数据,研究地面获取的先验PCV模型和利用残差法估计的在轨PCV模型对低轨卫星精密定轨的影响,并采用GFZ精密轨道对比和SLR检核手段对其进行评估。结果表明,使用先验PCV模型会降低GRACE卫星定轨精度,相反利用在轨PCV模型可以提高定轨精度,提升数量级可达mm级。
We use onboard GPS data of GRACE satellites to research the impact of the priori phase center variations(PCV)model by ground calibration and in-flight PCV model,estimated by the residual method.The orbit accuracy is assessed by GFZ precision orbits comparison and SLR checkout.The results show that using prior PCV models can reduce orbit determination accuracy,but using inflight PCV model can improve the orbit determination accuracy(mm level).
引文
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