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频率域中位场延拓及转换已在重磁场处理中得到了广泛的应用。但位场下延、求高阶导数时出现的振荡问题一直没有得到很好的解决。目前比较一致的认识是浅层异常源是导致下延振荡的唯一原因。事实上，当我们将原位场进行分场处理后，对深源场（不含浅层常源）进行下延时，仍出现较大的振荡。针对该问题。本文分析了位场下延的一些特殊性，认为核问题的根本原因在于有限长剖面的傅氏变换的截断误差产生类似于浅源异常的假频干扰，为此提出了串联匹配滤波器向下延拓的解决办法。通过向下延拓便可获得既无假频干扰信号，又不损失有效信号的高保真向下延拓位场。
In the frequency domain, the extension and conversion of the field have been widely applied in the processing of the heavy and the magnetic field. However, the problem of the oscillation when seeking the high-order derivatives has not been well solved. The current consensus is that the only source of shallow anomalies is the only cause of downward delay. In fact, when the original site field after field processing, deep source field (excluding shallow anomaly) for the next delay, there is still a large oscillation. For this problem. In this paper, we analyze some particularities of the delay of the potential field. The fundamental reason of the nuclear problem is that the truncation error of the Fourier transform of a finite-length profile is similar to the aliasing interference of a shallow source anomaly. To this end, a series matched filter is proposed Extension of the solution. By extending downwards, a high-fidelity downward continuation field can be obtained without interfering signals and without loss of useful signal.