Semi-aviation transient electromagnetic data correction method and system

Abstract

The invention discloses a semi-aviation transient electromagnetic data correction method and system, and the method comprises the steps: carrying out the wavelet transformation decomposition of semi-aviation transient electromagnetic data, carrying out the data reconstruction according to an obtained decomposition parameter, and determining a starting point and an end point of an effective data segment; carrying out sky electricity noise denoising on the semi-aviation transient electromagnetic data except the effective data segments; performing polynomial fitting on the single-cycle semi-aviation transient electromagnetic data except the effective data segments, and performing resampling on all data points according to an obtained fitting equation so as to carry out denoising on motion noise; screening the semi-aviation transient electromagnetic data meeting the quality standard according to the average energy ratio of the effective data segments to the denoised residual data segments; and performing attitude correction on the screened semi-aviation transient electromagnetic data according to the three-axis attitude angle of the receiving coil and the deflection of the reference coordinate system. The signal-to-noise ratio of exploration data is effectively improved, data errors are reduced, and the credibility of the data is improved.

Description

technical field [0001] The invention relates to the technical field of transient electromagnetic method, in particular to a method and system for correcting semi-aerial transient electromagnetic data. Background technique [0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art. [0003] The semi-airborne transient electromagnetic method with grounded long wire source combines the advantages of airborne electromagnetic and ground transient electromagnetic because of its ground excitation-air receiving device form. It has a wider range of applications, especially for special application scenarios such as complex terrain areas that cannot be detected on the ground, and areas that cannot be reached by the ground. However, since the semi-aerial transient electromagnetic method suspends the receiving coil in the air through the UAV for data collection, compared with the traditional ...

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Problems solved by technology

However, since the semi-aerial transient electromagnetic method suspends the receiving coil in the air through the UAV for data collection, compared with the traditional ground transient electromagnetic method, the noise components in the observation data are more abundant, such as astronomical noise , coil movement attitude noise, speed change and noise generated by UAV flight vibration, etc.; at the same time, because the semi-aerial transient electromagnetic method often uses a grounded wire source, the device form and theoretical method are completely different from the aeronautical electromagnetic method, so it only relies on other exploration methods. The data processing system of the method is not suitable

[0004] However, in terms of data processing, most of the amplification still uses the data processing and interpretation schemes of other traditional electromagnetic prospecting methods to process and interpret semi-aerial transient electromagnetic data. There is no independent data processing and interpretation system for semi-aerial transient electromagnetic, but Due to the change of the device form of the semi-airborne transient electromagnetic method, the data complexity is greatly increased, and it is unreasonable to rely solely on the data processing system of other exploration methods

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