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Mobile platform magnetic gradient tensor system correction method

A magnetic gradient tensor and mobile platform technology, applied in the direction of measuring devices, measuring electrical variables, instruments, etc., can solve problems such as large estimation error, high cost, and influence on calibration results, and achieve wide application range, improved performance, and improved calibration The effect of precision

Active Publication Date: 2019-08-20
OCEAN UNIV OF CHINA
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Problems solved by technology

[0005] Among the above step-by-step correction methods, one of the methods has a large estimation error, and the vector method is used for correction, and the cost is high; in the integrated correction method, a high-precision three-axis non-magnetic rotating table is required to provide standard azimuth information, and the rotation table The precision requirements of the three-axis rotary table are high, and the error of the three-axis rotating table will affect the correction results. Therefore, we propose a mobile platform magnetic gradient tensor system correction method to solve the above problems.

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[0035] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention.

[0036] refer to Figure 1-8 , a mobile platform magnetic gradient tensor system calibration method, comprising the following steps:

[0037] S1. Model the single-sensor system error. The single-sensor system error includes zero position deviation, three-axis non-orthogonal error and three-axis sensitivity inconsistency error. Ideally, the three axes of the three-axis fluxgate sensor are kept It is completely orthogonal, but due to the limitation of the manufacturing process, the sensor generally has non-orthogonal errors. Create a sensor non-orthogonal model such as figure 1 As shown in the figure: O-XYZ is the standard reference coordinate system, O-X 1 Y 1 Z 1...

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Abstract

The invention discloses a mobile platform magnetic gradient tensor system correction method, which comprises the following steps: S1, a single sensor system error is modeled; S2, a compensation modelis established for the single sensor system error; S3, a magnetic gradient tensor system is made to change the attitude randomly for data acquisition in three-dimensional space, and a proton magnetometer is used to measure the total magnetic field in the experiment environment; and S4, with the total magnetic field in the experiment environment as a standard, the data acquired by a fluxgate sensorare inverted to obtain system error parameters of the sensor. The correction method used in the invention is free from the dependence on a high-precision three-axis rotary table, random attitude fordata acquisition in the three-dimensional space can be carried out, the method is convenient and easy, the influences on the correction result by errors of the three-axis rotary table can be eliminated, the inversion precision is high, the simulation result shows that the system error parameter estimation error can reach a level of one thousandth, the correction precision of the magnetic gradienttensor system can be greatly improved, and the performance of the magnetic gradient tensor system is improved.

Description

technical field [0001] The invention relates to the technical field of a mobile platform magnetic gradient tensor system, in particular to a calibration method for a mobile platform magnetic gradient tensor system. Background technique [0002] At present, magnetic gradient tensor systems based on fluxgate sensors or superconducting quantum interferometers have been widely used. Compared with traditional magnetic vector measurements, magnetic gradient tensor measurements are more sensitive to magnetic anomalies and have higher spatial resolution. High, can provide more valuable information and other advantages, the magnetic gradient tensor system has been widely used in aeromagnetic detection and navigation, unexploded bomb search, mobile magnetic target reconnaissance and positioning and other fields. [0003] The magnetic gradient tensor system composed of fluxgate sensors mostly adopts the principle of differential approximation to collect data. Due to the limitation of t...

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Application Information

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IPC IPC(8): G01R35/00
CPCG01R35/005
Inventor 丁学振李予国亓夫军裴建新陈家林张晶罗鸣李卓轩刘浩
Owner OCEAN UNIV OF CHINA
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