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在地形匹配辅助导航系统中，匹配性能取决于地形的适配性。在数字地形图上，为了对它的适配性进行分析，必须依照由系统性能所确定的匹配区选择准则计算相应参数，确定适合于地形匹配的点（区），即适配点（区）。随着处理区域的增大，这些参数计算量急剧增加。为了加快计算速度，本文以方差、地形粗糙度、相关长度等参数计算为例，推导出快速算法，并给出了实验比较结果。
In terrain matching assisted navigation systems, the matching performance depends on the suitability of the terrain. In the digital topographic map, in order to analyze its adaptability, it is necessary to calculate the corresponding parameters according to the matching area selection criterion determined by the system performance and determine the suitable point (area) for the topographic matching, that is, the matching point . As the processing area increases, the computation of these parameters increases dramatically. In order to speed up the calculation speed, this paper takes the calculation of variance, topography roughness, correlation length and other parameters as an example to derive a fast algorithm, and gives the experimental comparison results.