Magnetic dipole target position measurement method based on the first derivative of magnetic anomaly

Abstract

The invention discloses a magnetic dipole target position measurement method based on a magnetic anomaly first-order derivative. The magnetic dipole target position measurement method adopts a measurement platform consisting of multiple triaxial magnetic sensors to perform measurement and comprises the following steps of 1 using first to eighth magnetic sensors to establish the measurement platform, wherein third to sixth magnetic sensors are located on the same straight line and jointly located at the center of the measurement platform, and other magnetic sensors are arranged around the measurement platform at intervals; 2 using a magnetic dipole target as a coordinate origin, using the third magnetic sensor as a measurement base point, solving a position coordinate value u, v and w through an equation set and finishing the measurement. The magnetic dipole target position measurement method adopts one measurement point to simultaneously measure two groups of data and solve position parameters of the magnetic dipole target, successfully solves the interference problem brought by the unstable measurement platform and difficultly-separated geomagnetic fields and improves the measurement accuracy.

Description

technical field [0001] The invention relates to a method for measuring the position of a ferromagnetic or magnetic object, in particular to a method for measuring the position of a magnetic dipole target based on the first order derivative of a magnetic anomaly. Background technique [0002] In the fields of geological exploration, biomedicine, shipwreck salvage, and positioning of underground or underwater unexploded objects, magnetic detection technology is often used to detect and locate targets by detecting space magnetic anomalies caused by ferromagnetic or magnetic objects. When the volume of the ferromagnetic target or the magnetic target is much smaller than the measurement distance, the ferromagnetic target or the magnetic target can usually be equivalent to a magnetic dipole source, so the above problems can often be evolved into using the magnetic dipole model for the target Positional parameter inversion problem. [0003] In the current published literature, the...

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Problems solved by technology

[0013] However, in practical engineering applications, there is a big problem in solving the above equations, that is, the magnetic induction value on the right side of the above equation cannot be directly measured, and the actual measured magnetic induction value generally includes the geomagnetic field. Including magnetic anomalies caused by metal parts of measuring instruments, electronic components, etc.

Although these values ​​can be regarded as a static fixed value within a certain range, since the magnetic induction is a vector, its three-component measurement value is closely related to the measurement direction. In the case of fluctuation or left and right rotation, there is great uncertainty in the measurement direction, so that the three-component value of the interference value such as the geomagnetic field cannot be calculated, and the corresponding magnetic induction value of the magnetic dipole field cannot be obtained.

[0014] Therefore, the measurement accuracy of the magnetic dipole target position parameter inversion method given in the current public literature is not high, and it is difficult to apply to actual engineering

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