Offset Coil Pairs for Semi-Airborne Electromagnetic Attitude Error Correction
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Solution Overview
Problem
Existing semi-airborne electromagnetic systems face challenges in reducing noise levels and correcting attitude errors, particularly due to motion noise and three-dimensional anomaly detection data uncertainties, limiting detection depth and accuracy.
Innovation Solution
A device and method using symmetrical offset coil pairs and attitude adjustment devices, including adjustable and fixed offset coils, to measure and offset attitude errors, improving signal-to-noise ratio and detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the receiving coil moves during measurement, then detection speed and coverage are improved, but motion noise is introduced that degrades signal-to-noise ratio
Solution Approach 1:
The coil system is segmented into a measuring coil and multiple offset coils arranged in different directions. By segmenting the measurement function across multiple coils at different spatial positions and orientations, the system can distinguish between vertical magnetic field signals and horizontal motion-induced noise, thereby maintaining detection speed while improving signal-to-noise ratio through differential measurement
Solution Approach 2:
Offset coils serve as intermediary sensors that measure the horizontal magnetic field components generated by coil attitude changes during motion. These intermediary measurements are then used to calculate and remove the motion noise contribution from the main measuring coil signal, enabling high-speed detection with improved reliability
2Measurement precision
If attitude correction based on iterative calculation is used, then some attitude error correction is achieved, but the method cannot fundamentally solve the magnetic field attitude error problem in three-dimensional anomaly detection
Solution Approach 1:
The system transitions from single-coil vertical field measurement to multi-coil three-dimensional field measurement by adding offset coils in different spatial directions. This dimensional expansion enables the system to capture horizontal magnetic field components that arise during attitude changes, providing the additional measurement dimensions needed to fundamentally solve attitude error in three-dimensional anomaly detection
Solution Approach 2:
The measurement system combines multiple coil types (measuring coil and offset coils) with different orientations into a composite sensor assembly. This composite structure enables simultaneous measurement of vertical and horizontal magnetic field components, allowing the system to maintain measurement precision while achieving full three-dimensional anomaly detection capability
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method effectively reduces attitude errors, enhancing the signal-to-noise ratio and expanding detection depth and range by accurately measuring vertical magnetic fields.
Implementation Method 1
The attitude change during the movement of the coil leads to the change of the equivalent receiving area of the coil in the direction of the measured magnetic field, and a horizontal magnetic field component much larger than the measured vertical magnetic field component is introduced
Implementation Method 2
a semi-airborne electromagnetic detection method may be applicable to detecting complex terrain areas
Data Source
AI summary
A device and a processing method for offsetting an attitude error of a semi-airborne electromagnetic system. The method includes following steps: adjusting attitude angles of the adjustable offset coil based on the changing attitude angle of the measuring coil; obtaining a magnetic induction intensity of offset coils based on the offset coil pairs after an attitude angle adjustment; performing a calculation based on the magnetic induction intensity of the offset coils to obtain attitude error data of the measuring coil; obtaining a magnetic induction intensity of the measuring coil with an attitude error offset based on the magnetic induction intensity and the attitude error data of the measuring coil.