Methods The phase sensitive method was used to remove the phase errors and restore the polarity of theinversionrecovery data .
方法采用相位敏感方法消除相位误差，保存反转恢复序列中磁化矢量的极性。
The GPS-levelling is used to add constraints on the simulated geoid, and the "remove-restore" method and the multi-quadric function method are used to interpolation, so as to obtain the refined geoid.
利用GPS水准对模拟大地水准面进行约束，采用“移去——恢复”技术和多面函数法进行拟合内插，得到转换后的大地水准面。
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