The results of the emulation and example show that the interpolation accuracy of these methods are different with distributing of known survey point and change of magnetic anomaly.

仿真与实例计算结果表明，已知点的分布情况及磁异常变化情况不同时，四种逼近方法的插值精度是不同的。

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Two major points are discussed about the design of sampling frequency change :the interpolation of the signal of integer and reslization of MATLAB ;

在频率转换的设计过程中主要讨论了两个问题，其一是信号的整数倍内插及MATLAB实现；

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When the GPS height is transformed by the generalized extended interpolation method, there is no step sudden change between each point of districts, so it does not need to deal with again;

利用广义延拓法进行GPS高程转换后，各个分区之间不存在台阶性的突变，无需再进行处理；

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