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采用快速傅立叶变换方法,理论上推导了基于多目标平面总强度磁异常分量换算的公式;根据恒定地磁背景场网格数据傅立叶变换后频率域除原点外处处为零的特点,利用总场强度换算磁异常分量时,可采取频率域原点强制置零方法消除地磁背景场的影响,分析了强制置零在磁异常分量换算中引入的误差以及总强度磁异常一级近似引起的误差。通过以上技术解决了由平面总场强度向磁性目标磁异常分量换算的问题,仿真计算评定了该方法的换算精度。
According to the characteristic of the magnetic field of the total intensity of the multi-target plane, the formula of the magnetic anomaly component based on the multi-objective plane intensity is derived theoretically by using the fast Fourier transform method. According to the characteristics of the frequency domain after the Fourier transform of the constant geomagnetic background field, When the magnetic anomalous component is taken into account, the influence of geomagnetic background field can be eliminated by force zeroing at the origin of the frequency domain. The error caused by forced zeroing in the conversion of magnetic anomalous component and the error caused by the first order approximation of total magnetic anomaly are analyzed. Through the above techniques, the problem of the conversion from the total field intensity of the plane to the magnetic anomalous component of the magnetic target is solved, and the conversion accuracy of the method is evaluated by the simulation calculation.