基于Hartley变换的地磁场延拓技术

Geomagnetic extension technology based on Hartley transform

为了实现地磁导航,必须构建相应的地磁数据库,位场延拓技术是建立地磁数据库的重要手段,但其不稳定性已成为制约地磁导航技术应用的重要因素.为解决这一问题,研究了位场向下延拓的积分迭代法,利用Hartley变换对积分迭代法进行改进,结果证明这一变换可以兼顾计算效率和计算精度.

In order to achieve geomagnetic navigation,geomagnetic database must be constructed.Potential field continuation technology is an important means to build geomagnetic database,but its instability has become an important factor restricting the application of geomagnetic navigation technology.To solve this problem,the integral iteration method for downward continuation of potential field was studied in this paper.Hartley transform was used to improve the integral iteration method.The result proved that this transformation could take account of both computation efficiency and computation accuracy.