地形适配性快速计算方法研究

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。

Research on Fast Algorithm of Terrain Suitability

The per formance of terrain aided navigation (TAN) system is dependent on terrain suitability. In order to analyze the suitability of terrain map,it is needed to calculate some parameters according to matching point selection criterion which are deterrnined by its system performance and to determine the points (or regions) which are suitable for terrain aided navigation, called suitable points (or suitable regions). As increasing the size of processing area, the computational cost of parameter calculation will increase sharply. In order to solve this problem, a fast algorithm for the calculation of parameters, such as variance, terrain toughness, and correlation length,are derived. The experimental result illustrates the feasibility of the algorithm.