Magnetic Sensor Posture Angle Measurement
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Solution Overview
Problem
Existing methods for measuring posture angles in fields like virtual reality, balance vehicles, and aircrafts face issues with large calculation quantities, high costs, and poor accuracy due to offset errors in gyroscope data and interference from specific forces, requiring complex hardware and algorithms.
Innovation Solution
A method and apparatus using magnetic field sensors to measure posture angles by acquiring characteristic magnetic field values in both carrier and geographic coordinate systems, eliminating the need for gyroscopes and accelerometers, and reducing hardware and calculation costs by processing only magnetic field data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If gyroscope and accelerometer are used to measure posture angle, then measurement capability is provided, but hardware cost and device complexity increase
Solution Approach 1:
The patent extracts and utilizes only the magnetic field sensing capability from the sensor system, eliminating the need for gyroscope and accelerometer components. This focuses the measurement function on a single sensor type (magnetic field sensor) that measures characteristic magnetic field values directly, thereby reducing hardware complexity while maintaining posture angle measurement capability.
Solution Approach 2:
The magnetic field sensor serves multiple functions: it measures characteristic magnetic field values for posture angle calculation and can potentially be used for other orientation-related measurements. This multi-functionality reduces the need for multiple specialized sensors (gyroscope, accelerometer), simplifying the overall hardware architecture.
2Duration of action of moving object
If gyroscope data is integrated over time to obtain posture angle, then continuous measurement is achieved, but error accumulates and measurement precision deteriorates
Solution Approach 1:
The patent performs preliminary calibration by measuring characteristic magnetic field values in known reference positions (0 degrees, 90 degrees, 180 degrees, 270 degrees) before actual measurement. This preliminary action establishes reference data that enables direct calculation of posture angles during operation without time integration, preventing error accumulation while maintaining continuous measurement capability.
Solution Approach 2:
The patent replaces the mechanical integration process (temporal accumulation of gyroscope data) with a direct geometric calculation method based on magnetic field vector relationships. Instead of integrating angular velocity over time, the system calculates posture angles directly from measured magnetic field characteristic values compared against reference values, eliminating time-related error accumulation.
3Adaptability or versatility
If accelerometer measures both gravity and specific force, then motion detection is enhanced, but posture angle calculation accuracy decreases due to specific force interference
Solution Approach 1:
The patent extracts only the magnetic field information from the sensor measurements, ignoring specific force data from accelerometers. By focusing exclusively on magnetic field characteristic values for posture angle calculation, the system eliminates specific force interference while maintaining the ability to detect orientation changes.
Solution Approach 2:
The patent introduces magnetic field characteristic values as an intermediary between sensor measurement and posture angle calculation. Instead of directly using accelerometer data that contains specific force contamination, the system uses magnetic field measurements as a mediator that provides clean orientation information independent of dynamic forces.
4Reliability
If complex filtering algorithms are applied to gyroscope and accelerometer data, then measurement robustness is improved, but calculation quantity and processing time increase
Solution Approach 1:
The patent creates a simplified measurement model that copies only the essential magnetic field characteristic values needed for posture angle calculation, discarding redundant data from gyroscope and accelerometer sensors. This copying approach reduces calculation quantity while maintaining measurement robustness through direct geometric relationships between magnetic field vectors.
Solution Approach 2:
The patent extracts only the necessary magnetic field measurement data and reference values, eliminating the need for complex filtering algorithms applied to multi-sensor data streams. By working with a single sensor type and direct mathematical relationships, the system achieves robust measurement with significantly reduced computational complexity.
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 approach allows for accurate, real-time posture angle measurement without time accumulation errors, reducing hardware costs and calculation complexity while providing absolute data independent of specific forces.
Implementation Method 1
arranging a sensor in a measured object, the sensor being used for measuring characteristic quantities of magnetic field in three dimensional directions
Data Source
AI summary
The present invention discloses a method and an apparatus for measuring a posture angle of an object. The method comprises the following steps: arranging a sensor in a measured object, the sensor being used for measuring characteristic quantities of magnetic field in three dimensional directions; actuating the sensor at the beginning of the measurement, and acquiring, by using the sensor, a current measured value of the characteristic quantity of magnetic field of the measured object in a carrier coordinate system; acquiring reference values of the characteristic quantities of magnetic field of the measured object in a geographic coordinate system; and calculating a current posture angle of the measured object according to numerical values of the characteristic quantities of magnetic field indicated by the reference value and the measured value in each direction respectively.