摘要
首先,介绍了基于不同卫星重力场模型的位系数误差方差谱组合、误差阶方差谱组合模型的算法;其次,根据位系数误差方差定权和位系数误差阶方差定权两种谱组合方法编写计算程序;最后,采用GRACE和GOCE模型进行谱组合计算,并对谱组合计算模型进行内、外符合精度分析与验证,谱组合得到的重力场模型精度和可靠性优于单一重力场模型,验证了谱组合方法的有效性。
Firstly, two methods of spectral combinations based on different satellite gravity models are introduced in this paper. These combinations are based on error variances of the single coefficients and on error degree variance, which avoids the large scale inversion of matrix needed in the union-adjustment process of the original observed data. Then we write programs on spectral combination of GRACE and GOCE satellite gravity models coefficients according to the two mehods.Finally, we use spectral combinations with GRACE and GOCE models to perform analog computation and testify its validity according to the inside and external quality analysis. The results show that combined gravity model＇ s precision and reliability are better than the sole model, thus verify the validity of spectral combination.
出处
《测绘地理信息》
2015年第3期66-70,共5页
Journal of Geomatics
关键词
地球重力场
卫星重力测量
谱组合
GRACE
GOCE
Earth＇s gravity field
satellite gravity measurement
spectral combination
GRACE
GOCE
