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Aeromagnetic Compensation Method Based on Nonlinear Aeromagnetic Total Field Gradient Compensation Model

A compensation method and field gradient technology, applied in the field of geophysical aeromagnetic exploration, can solve the problems of asynchronous working clock, compensation deviation, and difficulty in achieving strict synchronization of real-time data, and achieve the effect of improving accuracy and solving the compensation problem of disturbing magnetic field

Active Publication Date: 2018-10-02
INST OF ELECTRONICS CHINESE ACAD OF SCI
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Problems solved by technology

[0004] The applicant found that the above compensation method has the following defects. The aeromagnetic compensation algorithm is based on the traditional linear aeromagnetic compensation model. In the model, it is assumed that the data is ideally synchronized and there is no delay. However, the currently used aeromagnetic compensation exploration equipment consists of different modules ( Optical pump frequency measurement module, fluxgate data acquisition module, navigation and positioning module, data storage and compensation module, etc.), the working clocks of each module are asynchronous, and it is difficult to achieve strict synchronization of real-time data, which leads to aeromagnetic data compensation in interactive processing , the compensation deviation caused by the delay between signal channels will eventually affect the quality of aeromagnetic survey data

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  • Aeromagnetic Compensation Method Based on Nonlinear Aeromagnetic Total Field Gradient Compensation Model
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[0025] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0026] The aeromagnetic total field gradient compensation model is derived based on the aeromagnetic compensation model. At any position of the optical pump magnetometer probe, the total interference field of the aircraft is represented by the following aeromagnetic compensation model:

[0027]

[0028] In the formula, c i is the magnetic compensation coefficient of the total magnetic field, H d (t) is the total interference field at the optical pump magnetometer probe, H e is the total field modulus of the geomagnetic field, A i (t) is the characteristic element in the aeromagnetic compensation model, and the expression of the characteristic matrix A(t) composed of characteristic elements is as follows:

[0029] A(...

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Abstract

The invention provides an aeromagnetic compensation method based on a non-linear aeromagnetic total field gradient compensation model. Time series weighting modeling of output of a flux-gate magnetometer is carried out, and a direction cosine of a geomagnetic field and a direction cosine of an airplane, and an aeromagnetic compensation model characteristic matrix are estimated, and thereafter airplane platform magnetic interferences observed by an optical pump magnetometer is predicted to acquire the non-linear aeromagnetic total field gradient compensation model, and then the non-linear aeromagnetic total field gradient compensation model is solved to acquire an aeromagnetic compensation result. By establishing the non-linear aeromagnetic total field gradient compensation model, a compensation problem of an interference magnetic field caused by time delay between data channels is effectively solved, and the precision of the aeromagnetic compensation is greatly improved.

Description

technical field [0001] The invention relates to the field of geophysical aeromagnetic prospecting, in particular to an aeromagnetic compensation method based on a nonlinear aeromagnetic total field gradient compensation model. Background technique [0002] Airborne magnetic prospecting is an important means of airborne geophysical prospecting, which is widely used in the field of geophysics. Since the magnetometer needs to be fixed on the aircraft during airborne magnetic exploration, the interference magnetic field of the aircraft itself will seriously affect the measurement of the magnetometer, so it is of great significance to effectively compensate the interference magnetic field caused by the aircraft. [0003] At present, foreign magnetic compensation equipment is mainly used in the field of aeromagnetic exploration in China, such as the AADC series magnetic compensation instrument of RMS company and the aeromagnetic compensation equipment of PICO company. The compens...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V3/38
CPCG01V3/38
Inventor 张群英吴佩霖陈路昭费春娇黄玲朱万华方广有
Owner INST OF ELECTRONICS CHINESE ACAD OF SCI
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