INS/SAR integrated navigation system is researched. Firstly, overall program of the INS/SAR integrated navigation system is designed. Secondly, key technologies of this system are summarized:SAR image matching and the inertial/image information fusion. Three types of image matching algorithm are analyzed:image matching algorithm based on the Hausdorff distance, matching algorithm based on SIFT features and matching algorithm based on SURF features. Nonlinear ifltering method is proposed to solve the unequal interval and hysteresis of SAR measurement. At last, the development of INS/SAR integrated navigation in the future is envisaged.%对惯性/SAR图像组合导航技术进行了研究，在SAR图像辅助组合导航系统总体方案设计基础上，总结了SAR图像匹配和惯性/图像信息融合关键技术，分析了基于Hausdorff距离的图像匹配算法、基于局部不变特征的SIFT特征匹配算法、基于SURF特征的图像匹配算法，提出了解决SAR量测非等间隔和滞后的非线性滤波的思路；同时，结合惯性/SAR组合技术的研究现状，对惯性/SAR组合导航技术的研究方向进行了展望，为后续惯性/SAR组合技术的实际应用提供了有益的参考。
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