一种改进的地磁匹配算法研究

针对复杂电子环境中的飞行器，如何克服主惯导系统的误差发散现象，抑制其固有漂移，是实现高精度自主导航的关键。地磁导航以自主、全天候、无时间累积误差等特点成为新型自主导航手段，它的精度主要取决于地磁匹配算法的精度。在此提出一种改进的地磁匹配算法，首先采用快速方差法（MSD）进行预匹配；接着采用抗旋转的插值平移法，进行精匹配。结合粗匹配和精匹配，组成一种高效的地磁匹配算法。通过仿真研究表明，该算法具有精度高，抗小角度旋转，匹配速度快等优点。

Improved geomagnetic matching algorithm for navigation

For aircraft in complex electronic environment, how to overcome the error divergence phenomenon of the main inertial navigation system and inhibit its inherent drift is the key to achieve high-precision autonomous navigation. The geomagnetic navigation has become a new means of autonomous navigation due to its characteristics of independence, all-weather, no time accumulated error and so on. Its accuracy mainly depends on the geomagnetic matching accuracy. An improved geomagnetic matching algorithm is introduced. In the algorithm, the fast variance method is adopted for pre-matching, and then anti-rotation interpolation translation method is used to carry out fine matching. The rough matching and fine matching are combined to form an efficient geomagnetic matching algorithm. The simulation results show that the algorithm has the advantages of high precision, anti-rotation in small angle, high-speed matching and so on.