中文摘要：

针对传统天文定位算法中水平基准对其机载应用的制约，提出基于数学基准修正的机载天文位置确定方法；提出首先利用惯导姿态信息，构造天丈测量数学水平基准，通过惯导姿态阵实现载体系下的天文测量输出到当地水平基准坐标系下的变换，从而使高度差法的机载定位得以实现；为保证数学基准的准确有效，提出数学基准修正方案：利用高精度星敏定姿修正惯导姿态，以修正基准中耦合的惯导姿态误差。仿真实验表明，采用该方法进行的天文导航能有效解决其机载应用下水平基准制约问题，验证了其有效性，具有良好的工程实际应用前景。

英文摘要：

With intention to remove the restrictions caused by horizontal coordinate in traditional celestial navigation system （CNS） for flight location identification, an improved strap-down celestial navigation localization algorithm based on mathematic horizontal coordinate is put forward. It constructs the mathematic horizontal coordinate with the attitude matrix supplied by strap-down inertial navigation system （SINS）. Thus the celestial angle in the carrier coordinate can be converted to the corresponding angle in navigation coordinate. To ensure the accuracy of the mathematic horizontal coordinate, a modification scheme is proposed for decreasing the coupling attitude error caused by SINS, in which the attitude is modified by SINS/Star sensor integrated system before the math horizontal coordinate is constructed. Simulation demonstrates that the proposed method can overcome the restriction on horizontal coordinate in airbornc CNS, and has high precision, which indicates the good foreground for CNS in aviation application.