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中文摘要：
给出航空重力测量数据向下延拓的逆Possion积分、迭代法以及解析延拓的FFT计算公式，并分别使用三种方法将基于重力位模型EGM2008模拟生成的空中重力扰动观测值向下延拓到大地水准面上。研究结果表明，在不考虑地形影响情况下，逆Possion积分的效果最好。
英文摘要：
Downward continuation is one of the major parts in the post-processing of airborne gravity data. The formulae of inverse Possion integral, iteration method and analytical continuation by FFT are introduced briefly, then observations of gravity disturbance at flight level which are simulated with gravity potential model EGM2008 are downward continued to geoid level with these mentioned methods. A conclusion is drawn that inverse Possion integral can obtain the best results when terrain effect is neglected.
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