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- 2016
利用GRACE资料构造大尺度时变重力场统一模型
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Abstract:
基于2003～2012年的GRACE卫星重力资料，采用最小二乘拟合的方法，构建了时变重力场统一模型IGG-TVG2013。该模型以球谐系数的形式表达，在考虑趋势项和周期项等经验参数的基础上，还考虑了加速度项和潮汐模型误差、大地震等因素的影响。将IGG-TVG2013模型与GRACE资料进行了比较分析，在全球92%以上的区域二者符合精度优于±1 ugal；利用该模型外推预测了2013年1～6月的重力场变化，结果与GRACE实测数据符合较好。这表明IGG-TVG2013模型不但能较好地描述重力场的连续时空变化，而且具有一定的短期预测能力
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