In order to resolve the long-endurance aircraft SINS error correction problem, when the GPS signal is not available, we proposed an algorithm based on special landmark information for precise positioning of aircraft. Use-ing the image information of a particular landmark on the the airborne camera image plane, and through the image transformation, matching position and coordinates transformation, three-dimensional camera space coordinates and three attitude angles werer calculated. According to the transformation relation of camera and aircraft body coordinate system, the precise location of aircraft was calibrated. Computer simulation was carried out to validate the algorithm, and the results show that the proposed algorithm can satisfy the requirements of the integrated navigation accuracy for long-endurance aircraft as if the GPS is not available.%在飞行器导航定位优化控制的研究中,针对无法获得GPS信号时,长航时飞行器捷联惯导系统存在误差,提出了关于图像地标的飞行器精确定位算法,为实现成像系统对捷联惯导系统的误差校正奠定了基础.利用特定地标在机载摄像机像平面上的图像信息,通过图像变换、匹配定位、坐标变换,解算摄像机空间三维坐标和三个姿态角.再根据摄像机坐标系与机体坐标系的变换关系,推算飞行器精确位置.通过计算机仿真对算法进行了验证,结果表明,提出的算法能够满足GPS不可用时长航的飞行器组合导航精度要求,研究结果对长航时飞行器导航具有一定借鉴和参考价值.
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