海洋重力异常数据的EGM2008模型插补方法

The Interpolating Method of Sea Gravity Anomaly Data Based on EGM2008 Model

针对加权平均模型中反映信号区域性变化特征的权系数不易确定的问题,提出了利用EGM2008模型计算的重力异常数据表示重力场的趋势性变化以改进传统的加权平均法。基本步骤是利用实测海洋重力异常数据,借助EGM2008全球重力位模型,在移去-恢复技术框架下内插出残差重力异常数据,进而得到内插点的海洋空间重力异常。海区实测数据分析结果表明,本文所述方法计算的内插值,无论是分布情况还是与实测值差值的大小,都明显优于传统的加权平均法。

Aiming at the difficulty in the determination of weight function which can reflect gravity territorial va- riety character in weighted mean model, the EGM2008 model that can calculate the gravity anomaly data to in- dicate the change trend is imported to mend the traditional weighted mean model. The essential processes are： using the observed marine gravity anomaly data, applying the EGM2008 model, interpolating the residual gravity anomaly data under the remove-restore technology frame, then getting the marine gravity anomaly of interpolation point. Combined with weighted mean model, the marine gravity data interpolation model has been build up to reflect the variable features of the gravity anomaly in different areas. The results of the calculations and comparisons of the observed data showed that the distribution and the discrepancies of the data were better than the traditional weighted mean model.