摘要
人工数字地图是地形辅助导航系统的重要组成部分。针对实际地形的特点,将人工数字地图的生成过程分成整体骨架的构建与局部细节的调整两个环节。在整体骨架的构建过程中以地形的统计特性为依据,用地形起伏均方差描述某区域地形偏离地形均值的程度,用抗相关距离描述地形点之间相关程度;在局部细节的调整过程中对分形自适应地形生成算法作适当改变,根据地形的斜率信息获取线性化的等效网格距离,并取代随机位移模型。仿真结果与真实地形的统计特点基本吻合,表明该算法能较好地模拟真实的地貌。
Artificial data map is an important part of the terrain aided navigation system. In light of the characteristics of actual terrain, the process of the artificial data map creation was divided into two steps, namely the construction of holistic framework and adjustment of partial details. Based on terrain＇s statistic characteristics, in the process of constructing holistic framework the terrain heaving MS was used to describe the offset extent of one area＇s elevation deviating from its average, and anti - correlation distance was used to describe the correlation extent of different terrain locations. In the process of partial details＇ adjustment, the fractal and adaptive algorithm of terrain crea- tion was modified, and the linearized and equivalent grid distance obtained by referencing the information of terrain＇s slope took the place of random displacement model. Simulation results were basically coincident with the statistic characteristics of the real terrain, it showed that this algorithm could imitate the real physiognomy better.
出处
《计算机仿真》
CSCD
北大核心
2009年第6期66-69,共4页
Computer Simulation
关键词
人工数字地图
统计特性
高程
地形斜率
Artificial data map
Statistic characteristic
Elevation
Terrain slope
