Mobile Body Position Detection Error Correction
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Solution Overview
Problem
Existing methods for detecting the position of a mobile body on a plane suffer from significant precision errors, making it difficult to accurately determine the position with high precision.
Innovation Solution
A method involving the use of X-Y coordinates and reference lines on a plane, where a mobile body and a dummy mobile body with sensors are positioned at multiple points, allowing for calibration data acquisition and error correction through interpolation methods to achieve precise position detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a position detecting sensor and ultrasonic transmitters are used to detect the position of a mobile body, then the position can be determined based on transmission time of ultrasonic signals, but the position detection error becomes large and precision is poor
Solution Approach 1:
The patent applies preliminary action by performing calibration measurements at multiple predetermined positions before actual position detection. Correction data is calculated in advance by comparing detected positions with true positions at these calibration points, and this correction data is then used to improve the accuracy of subsequent position measurements through interpolation methods.
Solution Approach 2:
The patent changes parameters by introducing correction data that adjusts the raw position detection values. By calculating position variation amounts (correction data) at multiple calibration positions and using interpolation to determine correction values at arbitrary positions, the system transforms inaccurate raw measurements into corrected high-precision position data.
2Area of stationary object
If multiple transmitters and receivers are used to improve position detection coverage, then the detection area is expanded, but the device complexity increases
Solution Approach 1:
The patent applies dimensionality change by transitioning from direct position measurement to a two-stage process: first measuring at multiple calibration positions to build a correction data set, then using interpolation to calculate corrections for any position within the detection area. This approach expands the effective detection area without proportionally increasing the number of physical sensors.
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 enables the detection of the mobile body's position with high precision by correcting detected coordinate data using interpolation, thereby improving the accuracy of X-Y coordinate and rotation direction position data.
Implementation Method 1
a transmitter 112a and a transmitter 112b for transmitting the ultrasonic wave
Implementation Method 2
distances d2 and d3 between the two transmitters 112a and 112b, and the receiver 114 are determined based on a transmission time of ultrasonic signals
Data Source
AI summary
A method for detecting a position of a mobile body moving on a plane includes setting X-axis and Y-axis direction reference lines on the plane, disposing a dummy mobile body on intersection points of the reference lines, detecting a position of the dummy mobile body, determining position variation amounts at the intersection points as an X-axis direction error and a Y-axis direction error based on a difference from true position data, determining X-axis and Y-axis direction error approximate formulas based on the errors to calculate errors at each position on the reference lines, detecting the position of the mobile body, correcting acquired detected X-Y coordinate data by a linear interpolation method using the X-axis and Y-axis direction error approximate formulas, and obtaining position data close to the true position of the mobile body.