Forgetting factor RLS-based small signal model aeromagnetic compensation method

Abstract

The invention relates to a forgetting factor RLS-based small-signal model aeromagnetic compensation method, which comprises the following steps of: establishing an aeromagnetic compensation model: according to a T-L model, representing an aircraft interference magnetic field by superposing a permanent magnetic field, an induced magnetic field and an eddy magnetic field, establishing a small-signal model, solving direction parameters of four flying directions of an aircraft, obtaining a constant field, an induced magnetic field parameter and an eddy magnetic field parameter through an LS algorithm; carrying out parameter solution on the calibration flight data based on a small signal model based on a forgetting factor RLS, and calculating 16 parameters of a permanent field, an induction field and an eddy magnetic field through the small signal model; compensating the test flight data, and calculating direction parameters related to the flight direction; updating the solution direction parameters in real time by introducing a forgetting factor RLS algorithm; and performing simulation experiment and result analysis. According to the method, the direction parameters solved by the small signal model are updated in real time by using the forgetting factor RLS method, and the compensation quality of the aeromagnetic interference is improved.

Description

technical field [0001] The invention belongs to the technical field of geophysical exploration, and in particular relates to an aeromagnetic compensation method for a small signal model based on a forgetting factor RLS. Background technique [0002] Aeromagnetic detection is one of the important geophysical exploration methods, mainly used in mineral exploration, archaeological mapping (archaeological mapping), underground pipeline positioning and unexploded ordnance detection. During helicopter detection, the magnetic field generated by the helicopter platform will affect the accuracy of the magnetic sensor measurement. A simple way to reduce the magnetic interference of the aircraft platform is to hang the magnetic sensor under the aircraft by a long drag to increase the distance between the magnetic sensor and the aircraft, but this design will introduce the problem of direction and position errors. Another method is to rigidly fix the magnetic sensor on the aircraft, bu...

AI Technical Summary

Problems solved by technology

[0005]The purpose of the present invention is to provide a small signal model aeromagnetic compensation method based on the forgetting factor RLS, to solve the problem of geomagnetic The gradient and its own error lead to the problem that the accuracy of the solution result parameters is reduced. By introducing the forgetting factor RLS method, the solution parameters of the small signal model are compensated in real time, which further improves the accuracy of the aeromagnetic compensation.

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