Aeromagnetic compensation method based on major constituent analysis

Abstract

The invention discloses an aeromagnetic compensation method based on major constituent analysis. The method comprises steps that major constituents of a standard attitude matrix of calibration flight are calculated; the major constituents of the standard attitude matrix of the calibration flight are ordered according to contribution degrees, and multiple major constituents with relatively high contribution degrees are selected to acquire a new attitude matrix and a transformation matrix of the calibration flight; calibration flight data is utilized, the least square algorithm is utilized to acquire a compensation coefficient under the new attitude matrix; according to the transformation matrix of the calibration flight, major constituents of a standard attitude matrix of verification flight are extracted to acquire a new attitude matrix of the verification flight; magnetic compensation for measurement data of the verification flight is carried out, and aeromagnetic compensation based on major constituent analysis is realized. The method is advantaged in that problems of information overlapping caused by multicollinearity and inaccurate magnetic compensation caused by unstable inverse matrix solution existing in the prior art are effectively solved, the system information and noise can be effectively distinguished, system modeling accuracy is improved, and effective compensation of an aeromagnetic field is realized.

Description

technical field [0001] The disclosure belongs to the field of geophysical aeromagnetic prospecting, and relates to an aeromagnetic compensation method based on principal component analysis. Background technique [0002] As an important means of airborne geophysical prospecting, aeromagnetic prospecting has been widely used in the field of geophysics. This exploration method has significant advantages such as high efficiency, safety, and reliability. In the process of airborne magnetic method exploration, the equipment carrying platform is usually a fixed wing, helicopter, etc., and the optical pump magnetometer is usually fixedly connected to the carrying platform. Since the aircraft is made of ferromagnetic materials, in the geomagnetic field environment, the ferromagnetic materials on the aircraft will generate interference magnetic field signals to the signal detected by the optical pump magnetometer probe. This interference magnetic field will make it impossible to extra...

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Problems solved by technology

[0004] However, there is a problem of multicollinearity in the existing aeromagnetic compensation model. When the least squares algorithm is used to solve the problem, the attitude information matrix of the model is not full of rank, which eventually leads to irreversible information matrix, and the obtained compensation parameters are inaccurate. There may be problems in the compensation, so it is urgent to propose a magnetic compensation method that can reduce the complex collinearity in the aeromagnetic compensation model, so as to ensure the validity of the magnetic compensation for the data

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