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小天体形状及其相应的光学数据在小天体探测任务规划中有着重要作用,地面已有的实际小天体模型数量、精度有限,难以满足应用要求。针对小天体的不规则形状,在整体形状大致符合高斯随机球的假设条件下,建立初始的虚拟形状模型;为满足不同精度的应用要求,利用数据分层的思想,采用地表细节结构分形插值的方法添加新的表面点,逐步提高模型精度;通过对天体表面的陨石坑、岩石特性进行分析,根据现有的天体表面地形特征分布特性,添加小天体表面的地形特征,进而构建出完整的天体形状模型。论文最后对模型结果进行了图像仿真,并作了进一步的应用分析。
The small celestial body shape and its corresponding optical data play an important role in the small celestial body exploration mission planning. The actual small celestial body model existing on the ground has a limited number of precision and can not meet the application requirements. For the irregular shape of small celestial bodies, an initial virtual shape model is established under the assumption that the overall shape is roughly consistent with Gaussian random sphere. In order to meet the application requirements of different accuracies, the idea of data stratification and fractal interpolation of surface detail structure Methods A new surface point was added to improve the accuracy of the model step by step. Based on the craters and rock characteristics of the celestial body surface, the topographic features of the small celestial body surface were added according to the existing distribution characteristics of the terrain surface features, and a complete celestial body Shape model. Finally, the paper carried out the image simulation of the model results and made further application analysis.