Method for processing scalar magnetic anomaly gradient signal based on orthogonal basis function

An orthogonal basis function and magnetic anomaly technology, applied in geophysical surveying, electric/magnetic exploration, measuring devices, etc., can solve problems such as inability to give target orientation information, inability to meet the needs of target positioning, and limited detection capabilities

Active Publication Date: 2020-07-10
西北工业大学青岛研究院 +2
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Problems solved by technology

But when the signal-to-noise ratio is less than 1dB, the detection ability of the detection method based on noise suppression becomes very limited.
At the same time, traditional detection methods cannot give the orientation information of the target, and cannot meet the needs of target positioning.

Method used

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  • Method for processing scalar magnetic anomaly gradient signal based on orthogonal basis function
  • Method for processing scalar magnetic anomaly gradient signal based on orthogonal basis function
  • Method for processing scalar magnetic anomaly gradient signal based on orthogonal basis function

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Embodiment 1

[0072] 1. Acquisition of magnetic field gradient signal.

[0073] Four magnetometers are used to form an orthogonal gradient measurement array. Sensor pitch B in the array x = 1m, the magnetic sensor uses a CS-L optical pump magnetometer with a sensitivity of 0.6pT. The magnetic target moves in the horizontal plane, and its magnetic moment is (0,0,20)A·m2. The target moves from the starting position (-180, 30, 3) m to the end position (180, 30, 3) m in a uniform motion.

[0074] 2. Setting of orthogonal basis function

[0075] Analyze the magnetic field gradient signal and construct 4 orthogonal basis functions. According to the nature of the orthogonal basis function, the size of the observation window is set as: ω -n = -2.5, ω n = +2.5. The detection threshold is set to T=0.7.

[0076] 3. Calculation of coefficients of orthogonal basis functions

[0077] Using the orthogonal basis function and the magnetic field gradient signal, the coefficients corresponding to the orthogonal ba...

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Abstract

The invention relates to a method for processing scalar magnetic anomaly gradient signals based on orthogonal basis functions, which designs four basis functions of magnetic anomaly gradients by analyzing the magnetic anomaly gradients generated by a target. The method comprises: due to the fact that the four primary functions are linearly independent, obtaining the orthogonal primary functions ofthe scalar magnetic anomaly gradient signals through Gram-Schmidt orthogonalization and normalization; calculating a coefficient corresponding to the orthogonal basis function according to the property of the orthogonal basis function and the measured magnetic anomaly gradient signal; designing a detection index and a target azimuth parameter of the magnetic target by utilizing the coefficient; when the detection index is greater than a set threshold value, realizing magnetic anomaly detection; and then, obtaining azimuth information of the target according to the coefficient of the orthogonal basis function. According to the invention, the influence of magnetic noise on target detection can be effectively suppressed, the output signal-to-noise ratio is improved, and weak magnetic anomalydetection and positioning are realized.

Description

Technical field [0001] The invention relates to a method for processing scalar magnetic anomaly gradient signals based on orthogonal basis functions. The method can be widely used in the fields of energy mineral exploration, underwater various pipeline detection, underwater target detection, underwater archaeology, sunken ship survey, mine clearance and anti-submarine. Background technique [0002] The geomagnetic field is a natural physical field of the earth. It has various origins and is formed by the superposition of magnetic field components with different changing laws. According to the location of the field source, the geomagnetic field can be divided into internal source field and external source field. If the characteristics of the geomagnetic field change over time are considered, the geomagnetic field that changes quickly over time becomes the earth's changing magnetic field, and the geomagnetic field that changes slowly or basically unchanged over time becomes the ea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V3/08G01V3/38
CPCG01V3/08G01V3/38Y02A90/30
Inventor 樊黎明赵维娜王惠刚刘建国刘星胡浩
Owner 西北工业大学青岛研究院
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