Offset Calculation Circuit for Azimuth Sensor
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Solution Overview
Problem
Existing azimuth sensors face challenges in precisely detecting direction due to continuous temporal and spatial changes in offset caused by environmental and internal magnetic fields, requiring efficient automatic offset correction methods that reduce operational complexity.
Innovation Solution
An offset calculation circuit that sequentially obtains magnetic detection data, calculates reference lines or planes, and updates offset points to quickly and continuously cancel offsets, incorporating data point configurations and frequency adjustments for improved precision and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If a prior automatic offset correction method is used, then offset correction can be performed without manual input, but a large amount of operation is required and high operational capability is needed to quickly and continuously cancel offset
Solution Approach 1:
The patent segments the offset correction process into distinct functional units: a data acquisition unit that collects magnetic detection data, an offset calculation unit that computes offset values using specific algorithms (such as averaging multiple measurements or calculating deviations from reference values), and an offset application unit that applies the calculated offset to correct subsequent measurements. This segmentation automates the correction process while reducing operational complexity by distributing tasks across specialized components rather than requiring complex centralized processing.
2Measurement precision
If offset correction is performed continuously and quickly, then detection precision is improved, but high operational capability and complex processing are required
Solution Approach 1:
The patent implements preliminary action by pre-calculating offset values during periods when the sensor is stationary or when environmental conditions are stable. These pre-computed offset values are stored and automatically applied when measurements are needed, allowing quick correction without requiring complex real-time processing during actual azimuth detection. This approach maintains high detection precision while reducing the computational burden during critical measurement phases.
Solution Approach 2:
The system performs offset correction at periodic intervals rather than continuously, updating offset values based on accumulated data from multiple measurement cycles. This periodic approach allows the system to maintain accurate offset compensation while reducing the overall computational load, as not all processing operations need to run at maximum frequency. The periodic updates ensure that offset corrections remain current without requiring constant high-speed processing.
Data Source
AI summary
An offset calculation circuit comprising a data obtaining unit for sequentially obtaining two-axis or three-axis magnetic detection data as a set of data points of a two-axis coordinate system or a three-axis coordinate system; an offset recording unit for recording offset components of the magnetic detection data as an offset point of the two-axis coordinate system or the three-axis coordinate system; and an offset calculation unit for calculating a first reference line or a first reference plane put between first and second data points among the set of data points, and subsequently moving the offset point recorded in the offset recording unit in a direction toward the first reference line or the first reference plane to calculate a first offset candidate point.