Magnetic Distortion Detection for Wi-Fi Access Point Yaw
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Solution Overview
Problem
Magnetic distortions caused by nearby ferrous and magnetic objects affect the accuracy of yaw angles in directional antennas used by Wi-Fi access points (APs), leading to insufficient performance in adverse conditions.
Innovation Solution
Implement a detection mechanism in APs using a 3D magnetometer and 3D MEMS accelerometer to measure inclination and intensity values, comparing them with reference values from the International Geomagnetic Reference Field (IGRF) to detect and correct magnetic distortions, thereby improving yaw angle accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a 3D magnetometer and accelerometer are used to detect magnetic distortion, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent introduces an intermediary processing system that separates the detection function (magnetometer and accelerometer) from the analysis function (magnetic distortion detection algorithms). The sensors capture raw magnetic field data, which is then processed by a separate detection mechanism that compares measurements against reference values from the IGRF model, isolating the complexity of magnetic field analysis from the sensing hardware.
Solution Approach 2:
The detection system is segmented into distinct functional modules: (1) reference value acquisition module that obtains IGRF data, (2) sensor measurement module with magnetometer and accelerometer, (3) comparison module that detects deviations, and (4) distortion identification module. This segmentation allows each component to be optimized independently while maintaining overall system precision.
2Measurement precision
If reference values from IGRF are used for comparison, then measurement precision is improved, but loss of time occurs due to data acquisition and processing
Solution Approach 1:
The patent implements preliminary action by pre-acquiring and storing reference magnetic field values from the International Geomagnetic Reference Field (IGRF) model before actual distortion detection begins. These reference values, corresponding to different locations and times, are prepared in advance and stored in accessible memory, eliminating the need for real-time IGRF queries during the distortion detection process and significantly reducing measurement latency.
3Power
If directional antennas are used for better transmission performance, then power is improved, but reliability deteriorates due to sensitivity to magnetic distortion
Solution Approach 1:
The patent implements a feedback mechanism where the detected magnetic distortion information is fed back to correct the yaw angle calculations. The system continuously monitors magnetic field conditions, detects distortions by comparing with IGRF reference values, and uses this feedback to compensate for deviations in directional antenna orientation, thereby maintaining reliable transmission performance even in magnetically distorted environments.
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
Enhances the accuracy of directional antenna alignment, reducing interference and improving transmission performance while minimizing costs by using cheaper and smaller MEMS sensors instead of gyroscopes.
Implementation Method 1
obtain, using a magnetometer and an accelerometer of the AP, an inclination value, and an intensity value of a magnetic field intensity associated with the AP
Implementation Method 2
obtain, using a magnetometer and an accelerometer of the AP, an inclination value
Data Source
AI summary
In implementations of the present disclosure, a detection mechanism for magnetic distortion is provided. An access point (AP) obtains a reference inclination value and a reference intensity value of a magnetic field intensity based on a location of the AP, and obtains an inclination value and an intensity value of the magnetic field intensity. The AP determines a first difference between the reference inclination value and the inclination value, and a second difference between the reference intensity value and the intensity value, and determines that the first difference exceeds a first threshold or the second difference exceeds a second threshold. The AP detects, based on the first difference exceeding the first threshold or the second difference exceeding the second threshold, a distortion for at least one of the inclination value and the intensity value. Implementations of the present disclosure can improve the accuracy of the detection of the magnetic distortion.