随着地磁测量技术及各相关学科的快速发展,地磁导航的综合优势日益突出。地磁匹配导航定位误差不随时间积累且具有长期稳定性,可弥补惯性导航系统(Inertial Navigation System, INS)误差随时间累积的不足,INS的短期高精度又可为地磁匹配提供位置参考,从而提高匹配效率和匹配精度。INS/地磁匹配组合定位能满足“长期、自主、实时、高精度、全天候”的导航需求,从而成为一种新型的组合导航技术。
现有的大范围、导航用高精度磁测数据的数据源不足,针对此问题,本文在国际地磁学与高空大气物理学协会(International Association of Geomagnetism and Aeronomy, IAGA)提供的磁测数据Earth Magnetic Anomaly Grid 2 (EMAG2)基础上,提出一种插值算法对数据进行内插,以提高地磁图分辨率。空间数据内插中广泛使用的克里金法是无偏最优的,但它的“平滑效应”或“低通滤波”作用,难以获得两点间的局部细节变化和非均质特征。因此,本文将分形几何学思想引入到磁异常数据二维内插中,采用多重分形测度与克里金法相结合,提出一种多重分形测度克里...
【英文摘要】
With the fast development of the geomagnetic measurement technology and the related studies, the comprehensive advantages of geomagnetic navigation have become increasingly prominent. The positioning errors of geomagnetic matching navigation do not accumulate over time and have long-term stability, which can compensate the error accumulated over time in inertial navigation system (INS). INS can provide high-precision reference of short-term for geomagnetic matching positioning, which can improve the efficie...