项目围绕小行星表面地形和引力场建模问题，针对不同自旋状态的小行星，基于IAU决议和已有的对小行星体固坐标系的描述，建立适用于我国自主小行星探测需求的小行星体固坐标系定义规范。基于已有的探测数据，构建、修正小行星表面地形和形状模型；研究欠观测条件下小行星表面复杂地形的建模和时空关联表征方法，为小行星探测任务中导航特征提取与匹配、障碍检测与识别、安全着陆点选取提供理论方法；基于多种引力场建模方法和算法，研究在无绕飞轨道测量数据情况下小行星不规则引力场精确建模方法和球谐系数精确计算方法，并将该方法适用于密度不均匀小行星,为不规则弱引力场中的运动特性和稳定性分析、临近轨道精确设计提供相应的基础。虽然类似研究在国外早已开展，但见于公开发表文献的技术细节很少。本着为我国自主小行星探测作准备的初衷，需要开展本项目的研究。

This project focuses on the modeling approaches of the topography and gravitational field of asteroids. Based on the IAU resolutions and existing descriptions of the asteroids' body fixed coordinate system, our works sets up the body fixed coordinate system specifications for asteroids in different spin states, which can be specifically applied to China's independent asteroid exploration practices. Based on existing exploration results, the project works on the formation and correction of topography and shape models of asteroids. It figures out the spatial-temporal correlation characterization methods and modeling approaches for complex terrains of asteroids when lacking observation results , thus providing theoretical methods of the extraction,obtaining and matching of navigation features , obstacle detection and identification, and determination of safe landing areas.When no orbiting-orbit observation data is available, the accurate modeling methods and the calculation of exact spherical harmonic coefficients for irregular gravitational fields of asteroids are tried to be given based on a variety of modeling methods and algorithms, and applied to asteroids of heterogeneous density, paving the way for the analysis of motion characteristics and stability in irregular weak gravitational fields and the implementation of orbit design.Though parallel researches have long been conducted overseas, few technical specifications are revealed via publications. This project is therefore indispensible groundwork for future independent exploration of small bodies in China.