导航参考图适配性分析是景像匹配导航的关键问题之一。文中提出了一种基于捕获位置分布的估计导航参考图适配性方法。该方法首先在参考图每一点挖出实测图大小的子图，然后计算子图的特征参数并应用匹配准则估计子图的匹配概率，最后利用捕获位置分布函数对子图匹配概率加权求和以得到参考图的匹配概率。为了消除特征参数计算中存在的大量冗余计算，还研究了特征参数的快速计算方法。实验结果证明该快速算法大大提高了运算效率 Navigational reference map Adaptability analysis is one of the key issues in scene matching navigation. In this paper, we propose a method to estimate the navigability of reference map based on the distribution of captured positions. Firstly, a subgraph of the size of the measured image is excavated at each point of the reference image, and then the characteristic parameters of the subgraph are calculated and the matching probability of the subgraph is estimated by using the matching criterion. Finally, the position matching function is weighted by the position distribution function Get the probability of matching the reference graph. In order to eliminate a large number of redundant computations in the calculation of characteristic parameters, a fast calculation method of characteristic parameters is also studied. The experimental results show that the fast algorithm greatly improves the computational efficiency