Vehicle Position Capture Using Magnetic Marker Correction
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Solution Overview
Problem
Conventional position capture systems lack sufficient accuracy in determining a vehicle's position.
Innovation Solution
A method and system that select the nearest laying position of magnetic markers to correct the actual measured position, using these markers to enhance positional accuracy by employing a combination of GPS and inertial navigation, with magnetic markers placed wider than the error circle radius to minimize errors and improve accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If GPS-based position capture is used, then the system can measure absolute position through radio waves from satellites, but the position accuracy is insufficient
Solution Approach 1:
The patent combines GPS position capture with magnetic marker detection to create a hybrid positioning system. The GPS provides coarse position information while magnetic markers provide fine-position correction, merging two different positioning methods to achieve both wide coverage and high accuracy simultaneously
Solution Approach 2:
Magnetic markers are introduced as intermediary reference points between the GPS satellite signals and the vehicle's position determination system. These markers serve as local reference landmarks that mediate the position correction process, enabling accurate position capture by comparing detected marker positions with pre-stored reference data
2Measurement precision
If magnetic markers are placed closer together, then position accuracy improves, but the complexity of marker deployment increases
Solution Approach 1:
Instead of densely deploying markers throughout the entire area, the patent uses partial deployment by placing markers only at critical locations such as intersections, curve sections, and other key points where high position accuracy is most needed. This selective placement achieves sufficient positioning accuracy while minimizing the total number of markers and deployment 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 enables high-accuracy position capture, improving vehicle control and navigation systems by reducing errors in vehicle speed, acceleration, and yaw rate measurements, and enhancing route-following capabilities.
Implementation Method 1
a plurality of magnetic detecting elements which are aligned in a direction intersecting the moving direction of the vehicle... detected for several times at a predetermined timing
Implementation Method 2
On receiving a radio wave from an artificial satellite by means of an antenna, the geographical position is calculated by means of a GPS receiver
Data Source
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AI summary
A position capture method for capturing an own vehicle position by using a positioning part that measures a position of a vehicle (4) and a plurality of magnetic markers (5) laid on a traveling path of the vehicle (4) with their laying positions specified includes: upon detection of any of the plurality of magnetic markers (5), selecting, from among the laying positions of the plurality of magnetic markers (5), the laying position located nearest to an actual measured position measured by the positioning part; and capturing, as the own vehicle position, a corrected position based on the laying position, thereby making high-accuracy position capture possible.