Azimuth Calculation Using Geometrical Offset Selection
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Solution Overview
Problem
Conventional azimuth measuring apparatuses require large amounts of 2-axis or 3-axis data, leading to high memory usage and slow response speeds due to the need for statistical analysis, and fail to accurately account for offsets caused by nearby magnetic bodies.
Innovation Solution
An azimuth calculating apparatus with a magnetic sensor, data selecting unit, offset calculating unit, and median filter unit that selects and processes offset data items using geometrical methods to calculate an accurate azimuth by removing noise and determining geomagnetic field components, reducing memory usage and improving response speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If statistical analysis is used to calculate azimuth from large amounts of 2-axis or 3-axis data, then measurement precision is improved, but memory usage increases and response speed decreases
Solution Approach 1:
The patent segments the data processing task by selecting only specific data items (those with maximum and minimum magnetic field values) rather than processing all collected data. This segmentation reduces the computational burden while maintaining azimuth calculation accuracy, directly resolving the contradiction between measurement precision and response speed.
Solution Approach 2:
The patent extracts only the essential data elements needed for offset calculation - specifically the data items with maximum and minimum magnetic field values - and discards redundant information. This extraction approach maintains measurement precision by focusing on critical data while significantly reducing memory usage and computation time.
2Measurement precision
If statistical analysis is used to calculate azimuth from large amounts of data, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent simplifies device complexity by segmenting the data processing workflow into distinct stages: data collection, identification of maximum and minimum values, offset calculation using selected points, and azimuth computation. This structured segmentation makes the overall system easier to implement and maintain while preserving measurement precision.
Solution Approach 2:
The patent uses a simplified, disposable approach to data processing by calculating offset only when necessary (when magnetic body interference is detected) rather than continuously performing complex statistical analysis. This reduces device complexity while maintaining adequate measurement precision.
3Device complexity
If offset is not taken into account, then device complexity is reduced, but measurement precision deteriorates due to magnetic body interference
Solution Approach 1:
The patent applies preliminary action by calculating the offset value in advance when magnetic body interference is detected, before performing azimuth calculation. This preliminary offset calculation is stored and applied during normal operation, ensuring measurement precision without adding complexity to the real-time azimuth computation process.
Solution Approach 2:
The system performs self-service by automatically detecting when magnetic body interference occurs and triggering offset recalculation without user intervention. This self-service mechanism maintains measurement precision while keeping the user interface simple and the overall device complexity low.
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 solution enables efficient calculation of accurate azimuths by selecting and processing offset data items, reducing memory usage and computation time while improving the reliability of offset calculations and response speed.
Implementation Method 1
a magnetic sensor configured to sense magnetic field
Data Source
AI summary
A method and an apparatus for calculating azimuth, and a method and an apparatus for determining an offset from geomagnetic field are provided. An apparatus for calculating azimuth includes a magnetic sensor configured to sense magnetic field, a data selecting unit configured to select offset data items, an offset calculating unit configured to calculate an offset by a geometrical method that uses the selected offset data items, and an azimuth calculating unit configured to calculate an azimuth by using the calculated offset.