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Method and system for calculating magnetic anomaly signal frequency characteristics

A magnetic anomaly and signal technology, applied in the field of magnetic anomaly detection, can solve problems such as the inability to ensure the consistency of conditions

Active Publication Date: 2020-11-10
HARBIN ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Even in the same scene, the consistency of the conditions cannot be ensured

Method used

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  • Method and system for calculating magnetic anomaly signal frequency characteristics
  • Method and system for calculating magnetic anomaly signal frequency characteristics

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Embodiment 1

[0083] figure 1 It is a method flow chart of a method for calculating frequency characteristics of magnetic anomaly signals provided by the present invention. see figure 1 , the calculation method of the upper limit frequency point of frequency domain energy of a kind of magnetic anomaly signal provided by the present invention comprises:

[0084] Step 1: Use the original sensitive direction of the sensor and the original induced magnetic field generated by the magnetic dipole to establish a magnetic dipole magnetic anomaly signal analysis model, including:

[0085] (1) Establish a magnetic dipole model equivalent to a ferromagnetic target

[0086] In magnetic anomaly detection (MAD, magnetic anomaly detection), when the closest contact path (CPA, closest path approach) between the target and the sensor is at least three times larger than the largest linear scale of the target, the ferromagnetic target can wait The effect is a magnetic dipole model. Therefore, a magnetic d...

Embodiment 2

[0120] The construction methods of the low pass filter (LPF, low pass filter) used in the detection of magnetic anomaly signals in different fields are different. -0.3Hz; vehicle sensing studies have adopted filter frequencies of 0.001-7Hz and 0.6-10Hz; for small magnetic foreign body metal detection, a filter frequency of 2h On the basis of the calculation formula, an adaptive low-pass filter is constructed, and the specific methods include:

[0121] Step 1: Simplify the upper frequency point f of the frequency domain energy of the magnetic anomaly signal h The calculation formula

[0122] Note that the analytical form of g(α,β,θ,φ) is difficult to derive. Therefore, in order to estimate the upper limit of the g function, this application adopts a processing method based on a Monte Carlo algorithm for estimation. The Monte Carlo method is an effective simulation approximation method, which can find approximate suboptimal solutions with less work and does not require complex...

Embodiment 3

[0138] The present invention also provides a calculation system for the upper limit frequency point of the frequency domain energy of the magnetic anomaly signal, including a magnetic dipole magnetic anomaly signal analysis model establishment module and an upper limit frequency point calculation module;

[0139] The magnetic dipole magnetic anomaly signal analysis model building module utilizes the original sensitive direction of the sensor and the original induced magnetic field produced by the magnetic dipole to establish a magnetic dipole magnetic anomaly signal analysis model; the establishment of the magnetic dipole magnetic anomaly The parameters of the signal analysis model include the strength of the magnetic moment, the direction of the magnetic moment, the coordinate sensitive direction of the sensor, the closest contact path between the ferromagnetic target and the sensor, and the movement speed of the ferromagnetic target; the coordinate sensitive direction of the s...

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Abstract

The invention relates to a method and system for calculating magnetic anomaly signal frequency characteristics, and the method comprises the steps: obtaining a proportional relation between an upper limit frequency point of the frequency domain energy of a magnetic anomaly signal and the movement speed of a ferromagnetic target object,an inverse proportion between the upper limit frequency point and the nearest contact path between the ferromagnetic target object and the sensor, and an non-linear relationship between theupper limit frequency point and the magnetic moment direction and the sensitive direction of the sensor through a magnetic dipole magnetic anomaly signal analysis model, a frequency spectrum formula of the magnetic anomaly signal and a control variable method; and accordingto the calculation formula of the upper limit frequency point of the frequency domain energy of the magnetic anomaly signal, quickly estimating the upper limit cut-off frequency of the magnetic anomaly signal in a certain detection scene.

Description

technical field [0001] The invention relates to the technical field of magnetic anomaly detection, in particular to a method and system for calculating frequency characteristics of magnetic anomaly signals. Background technique [0002] Since the magnetic permeability of ferromagnetic targets is higher than that of most media such as air, water, seawater and soil, the surrounding geomagnetic field will be disturbed. Magnetic anomaly detection (MAD) is a method to detect magnetic disturbances. Specifically, when there is relative movement between the sensor and the observed object, the voltage information output by the sensor contains the magnetic field change information of the unknown target object characteristics. This physical phenomenon makes the obtained magnetic anomaly features can be used as important clues for hidden target detection, localization and identification, especially in cross-medium detection scenarios. [0003] Current research on MAD mainly focuses on ...

Claims

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Application Information

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IPC IPC(8): G01V3/38G01V3/08
CPCG01V3/38G01V3/081Y02A90/30
Inventor 沈莹高俊奇王嘉增蒋泽坤
Owner HARBIN ENG UNIV
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