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本文所采用的基于输入－输出系统论的谱方法在计算结果的精度上与最小二乘配置方法相当，却很容易用于异性场的计算。用该谱方法对卫星测高及海洋重力资料进行组合求解重力场量（大地水准面差距和重力异常），其误差估计结果表明各向异性场的计算精度优于各向同性场的精度。
The spectral method based on input-output system theory adopted in this paper is equivalent to least square method in the accuracy of the calculation results, but it is easy to calculate for the heterosexual field. Using this spectral method to combine the satellite altimetry and ocean gravity data, we can find the gravity field (geoid and gravity anomalies). The error estimation results show that the anisotropic field is more accurate than the isotropic one.