A Method of Determining the Position of Magnetic Target Using Small Subfield Recognition Algorithm

Abstract

The invention discloses a method for determining a magnetic target position by using a small sub-region identification algorithm. According to the method, an initial threshold value K is set to be equal to 0.1; the average value delta Sg and corresponding mean square error S sigma of corresponding average values delta gi in a plurality of sub-regions are calculated; S sigma is compared with K; when S sigma is smaller than K, the recognition output value of the center position of a window is set to be 0; when S sigma is larger than K, the recognition output value of the center position of the window is set to be 1; the window is shifted to the next point, and the above calculation process is repeated until first calculation of a whole region is completed; and the threshold value K is assigned to the maximum S Sigma in the whole region. The above method is utilized to perform cyclic calculation on the whole region until circulation termination conditions are satisfied. Based on magnetic anomaly information, characteristic parameters of a magnetic target, such as space position, size and shape, are judged through specific algorithms, and target monitoring and recognition can be realized.

Description

technical field [0001] The invention belongs to the field of magnetic target detection, and in particular relates to a method for determining the position of a magnetic target by using a small subfield recognition algorithm in the application of geomagnetic measurement and geomagnetic inversion. Background technique [0002] The geomagnetic field can generally be divided into geomagnetic normal field and geomagnetic anomalous field. In the actual measurement process, the division of normal field and abnormal field is often relative. There is a difference between the measured strength of the earth's magnetic field and the theoretical magnetic field strength, and this difference is called geomagnetic anomaly. It is mainly an additional magnetic field generated by magnetic objects magnetized by the earth's magnetic field. Therefore, the study of magnetic anomalies can help people find magnetic objects effectively. According to the magnetic anomaly information, through certai...

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Problems solved by technology

However, when inverting the horizontal position and depth of field sources, the Euler homogeneous equation is an equation with extremely high sensitivity. A slight deviation in the calculation accuracy of the anomalous derivative in the formula will cause strong interference in the inversion

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