Aeromagnetic compensation method based on non-linear aeromagnetic total field gradient compensation model

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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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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