Time domain electromagnetic data target inversion method based on supervised decent method

Abstract

The invention provides a time domain electromagnetic data target inversion method based on a supervised decent method. The processes are as follows: training process; setting different learning samples, acquiring the corresponding secondary field response as an observation matrix; for each learning sample, performing iterative training to acquire the gradient descent matrix of the whole training sample; the inversion process: performing inversion target secondary field response measurement nearby the abnormal region to acquire an observation vector of the inversion target; setting initial parameters of the inversion target, and performing inversion by utilizing the gradient descent matrix of the whole training sample and the observation vector of the inversion target, thereby acquiring real parameters of the inversion target. Through the method provided by the invention, the target parameter of the underground target can be accurately acquired.

Description

technical field [0001] The invention provides a time-domain electromagnetic data target inversion method based on a supervised descent method, which belongs to the technical field of underground target detection. Background technique [0002] The time-domain electromagnetic method is a non-destructive detection method based on the principle of electromagnetic induction. It uses an ungrounded loop (magnetic source) or a grounded line source (electric couple source) to emit a primary field underground. , the induced eddy current excited in the underground conductor target will generate an induced electromagnetic field that varies with time. Compared with the frequency-domain electromagnetic method, the time-domain electromagnetic method has the advantages of not being affected by the primary field, high signal-to-noise ratio, and higher detection and resolution capabilities. Therefore, the time-domain electromagnetic method has become one of the important methods for shallow u...

AI Technical Summary

Problems solved by technology

At present, the commonly used method is to use the actual observation response to give the approximate plane position of the underground target, but the target burial depth, inclination angle and dipole intensity cannot be obtained through the measured response, and only guessed initial values ​​can be given, while the inversion optimization used To a certain extent, the algorithm has a high dependence on the initial value. If the initial value is inaccurate, the inversion result of the final solution will be quite different from the actual one.

Images