Cross-Frame Geomagnetic Vector Calibration for Airborne Measurement
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Solution Overview
Problem
Existing airborne magnetic vector measurement systems using manned helicopters or fixed-wing aircraft lack a perfect calibration scheme, leading to unsatisfactory measurement accuracy due to rigid installation of magnetometers and attitude instruments, which hinders precise determination of magnetic vector parameters.
Innovation Solution
An integration and calibration method for geomagnetic vector measuring devices, involving a cross-shaped frame structure with rotatable sleeves, magnetic probes, and an electromagnetic shielding cabinet, along with detection and correction of spatial relationships between magnetic and attitude instrument axes, enabling accurate coordinate transformations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If magnetometer and attitude instrument are rigidly installed on aircraft through hard brackets, then the device structure is simple and stable, but measurement accuracy is not satisfactory due to lack of perfect calibration scheme
Solution Approach 1:
The patent introduces a rotatable sleeve mechanism that allows the magnetic probe to rotate relative to the attitude instrument, transforming the rigid fixed installation into a dynamic adjustable structure. This enables precise calibration of the spatial relationship between magnetic axis and attitude instrument axis, thereby improving measurement accuracy while maintaining operational simplicity
Solution Approach 2:
The patent performs preliminary calibration before actual measurement by detecting and correcting the rotation relationship between magnetic axis coordinates and attitude instrument coordinates. The calibration parameters are pre-determined through rotation detection, and then applied to subsequent measurements, ensuring high accuracy without complex real-time adjustments
2Adaptability or versatility
If three-axis fluxgate magnetometer is used for field observation, then magnetic vector parameters can be measured, but precise determination of vector orientation requires additional attitude instrument and equipment integration
Solution Approach 1:
The patent merges the magnetometer and attitude instrument into a single integrated measurement system mounted on the aircraft. The magnetic probe and attitude instrument are co-mounted and rotated together as one unit, eliminating the need for separate calibration procedures and reducing overall system complexity while maintaining full measurement capability
Solution Approach 2:
The integrated system performs multiple functions simultaneously: the attitude instrument provides orientation data while the magnetic probe measures magnetic field components, and the rotatable sleeve enables both calibration and measurement operations. This multi-functional design reduces the need for separate equipment and simplifies the overall system
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 significantly improves measurement accuracy, allowing for both aerial and ground geomagnetic vector measurements, simplifies the system, and enhances practicability by removing components like tail rudders, thereby stabilizing the attitude for precise magnetic vector and gradient measurements.
Implementation Method 1
three-axis fluxgate magnetometer has also been rapidly popularized and applied, among which the use of three-axis fluxgate magnetometer to carry out airborne magnetic vector (gradient) measurement is one of the important topics
Data Source
AI summary
An integration and calibration method of geomagnetic vector measuring device for exploration is provided and includes: S1, designing a magnetic vector measuring equipment main body as a cross-shaped frame structure; S2, arranging magnetic probes at upper and lower ends of a cross-shaped frame; S3, detecting a rotation relationship between three magnetic axis coordinates of each of the magnetic probes and three-axis coordinates of an attitude instrument; S4, correcting and calculating detected parameters. The disclosure solves the problem in prior art, magnetometers and attitude meters are rigidly installed on an airplane through devices such as hard brackets, and the measurement accuracy is not high because there is no perfect calibration scheme without matching. The disclosure greatly improves the accuracy of geomagnetic vector measurement, and can carry out aerial magnetic vector and vertical gradient measurement of magnetic vectors, and be used for ground geomagnetic vector measurement, and has higher practicability.