提出了基于特征的三维地形匹配算法,通过提取山地的山谷线作为地形特征,对基准图和实时图中的特征进行匹配来确定飞行器所在的地理位置。匹配过程阐述了树描述符算法,拓扑粗匹配以及几何量精匹配等概念,该算法具有较大的拉入范围,在一定程度上可以克服因实时图和基准图的差异而产生的误匹配。 A three-dimensional terrain matching algorithm based on features was proposed. The mountain valley line was extracted as the topographic feature and the features in the benchmark and real-time maps were matched to determine the geographic location of the aircraft. Matching process describes the tree descriptor algorithm, topological coarse matching, and geometric precision matching concept, the algorithm has a larger pull-in range, to a certain extent, be able to overcome the difference between the real-time map and the reference map resulting from mismatch.