Magnetometer Gyroscope Vibration Compensation Navigation
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Solution Overview
Problem
High-speed moving platforms face challenges in accurately measuring magnetic field gradients due to high-frequency vibrations, which result in inaccurate navigation without additional correction mechanisms.
Innovation Solution
A magnetometer coupled with a gyroscope is used to measure magnetic field gradients and compensate for errors caused by misalignment and vibrations, providing accurate navigation by projecting the magnetic field gradient tensor onto the direction of motion and applying a correction value to reduce noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a magnetometer is used to measure magnetic field gradients on a high-speed moving platform, then navigation capability is provided, but measurement accuracy deteriorates due to high-frequency vibrations
Solution Approach 1:
A gyroscope is introduced as an intermediary device to measure the vibration characteristics of the moving platform. The gyroscope data serves as a mediator to characterize the high-frequency vibrations, which then enables the development of correction values to compensate for the measurement errors in the magnetometer readings.
Solution Approach 2:
The system implements a feedback mechanism where the magnetometer continuously measures magnetic field gradients, the gyroscope monitors vibration, and correction values are computed based on the vibration characteristics. These correction values are applied to compensate for measurement errors, creating a closed-loop system that continuously improves navigation accuracy despite high-speed vibrations.
2Measurement precision
If correction mechanisms are added to compensate for vibration errors, then measurement accuracy is improved, but device complexity increases
Solution Approach 1:
The patent combines the magnetometer and gyroscope into an integrated navigation system where both sensors work together on the same platform. The correction value computation merges the magnetic field gradient measurements with the vibration characteristics data, creating a unified processing approach that reduces overall system complexity compared to separate correction systems.
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
This solution enables accurate determination of geographical location and navigation without reliance on GPS, even in high-speed and GPS-denied environments, by effectively mitigating errors in magnetic field gradient measurements.
Implementation Method 1
A magnetometer may be used to measure a magnetic field gradient of the Earth
Implementation Method 2
A magnetometer coupled with a gyroscope is used to measure magnetic field gradients and compensate for errors caused by misalignment and vibrations
Data Source
AI summary
Technology for determining a geographical location is described. A sequence of magnetic field gradient measurements can be identified for specific positions on the Earth that correspond to a path traveled by a moving platform. The sequence of magnetic field gradient measurements for the path can be compared to a reference magnetic field gradient map. A trajectory derived from the reference magnetic field gradient map that correlates to the sequence of magnetic field gradient measurements can be identified. The trajectory can have known geographical coordinates. The geographical location of the moving platform can be determined based on the known geographical coordinates of the trajectory.