从航磁资料延拓出海面磁场  

To continue aeromagnetic data to the sea level

作　　者：徐世浙[1] 王瑞[2] 周坚鑫[3] 肖鹏飞[1] 陈生昌[1] 

机构地区：[1]浙江大学地球科学系,浙江杭州310027 [2]中国人民解放军海军司令部航海保证部,天津300042 [3]中国国土资源航空物探遥感中心

出　　处：《海洋学报》2007年第6期53-57,共5页

基　　金：教育部博士点基金资助项目(20050335090);自然科学基金资助项目(40644022)

摘　　要：因延拓深度有限,现有的位场向下延拓方法不能从航磁资料向下延拓出海面的磁场.位场大深度向下延拓方法——迭代法,可以从航磁资料向下延拓出海面的磁场,得出与航磁同比例尺的海面磁力图,可大大提高海洋磁测成果的综合利用率.介绍了迭代法位场延拓原理.用迭代法对实际资料进行了处理,讨论了误差产生的原因.对比了迭代法与快速傅立叶变换法(FFT)在位场向下延拓中的效果,迭代法显著优于FFT法.The existing methods of downward continuation of potential fields connot be used to continue the aeromagnetic data to the sea level because of the limited continuation depth. An iteration method for downward continuation of potential fields with a larger continuation depth has been developed, which can continue the aeromagnetic data to the sea level and get the sea-magnetic chart with the same scale as the aeromagnetic data. This downward continuation method will greatly raise the efficiency of seamagnetic investigation. The principle of the iteration method is presented and a real case with a discussion on error of continuation is given. The effects of downward continuation of potential fields are compared using the iteration method and the fast Fourier transform（FFT） respectively, the former is much better than the latter.

关 键 词：航磁 海面磁场 位场向下延拓 迭代法 快速傅立叶变换法 

分 类 号：P318.63[天文地球—固体地球物理学]