Magnetic Road Marker Positioning with IMU Correction
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Solution Overview
Problem
Conventional vehicle positioning systems, such as those using GPS, face challenges in accurately determining vehicle position in areas where GPS signals are blocked or weakened, like tunnels and between buildings, leading to fluctuating accuracy in driving assist control.
Innovation Solution
A marker system that includes magnetic detection, position information acquisition, and relative position estimation using inertial navigation, where magnetic markers laid in the road allow for reliable vehicle positioning by detecting magnetic flux density and using RF-ID tags to transmit position data, enabling accurate identification of vehicle position regardless of the surrounding environment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If GPS is used for vehicle positioning, then positioning can be achieved in open areas, but positioning accuracy deteriorates in places where GPS waves are blocked or difficult to reach
Solution Approach 1:
The patent introduces magnetic markers as an intermediary positioning reference system. These markers are laid on the road surface and detected by magnetic sensors on the vehicle, serving as a mediator between the vehicle and the positioning system. This allows the vehicle to determine its position through magnetic field detection rather than relying solely on GPS waves, thereby maintaining positioning reliability in areas where GPS is blocked.
Solution Approach 2:
The patent replaces the electromagnetic wave-based GPS positioning system with a magnetic field-based detection system. By substituting the mechanical/electromagnetic detection mechanism (magnetic sensors detecting magnetic markers) for the radio wave reception mechanism (GPS receivers), the system achieves reliable positioning in environments where electromagnetic wave propagation is blocked.
2Measurement precision
If magnetic markers are laid on the road for positioning, then positioning accuracy improves in GPS-denied areas, but the system complexity increases
Solution Approach 1:
The patent divides the positioning system into separate functional components: magnetic markers laid on the road, magnetic sensors on the vehicle, and a control unit for processing. This segmentation allows each component to be optimized independently and simplifies the overall system architecture, reducing complexity while maintaining high positioning accuracy in GPS-denied areas.
3Reliability
If inertial navigation calculation is used for relative position estimation, then continuous position tracking is achieved between markers, but error accumulation occurs over time
Solution Approach 1:
The patent implements a feedback mechanism where the vehicle's position is continuously corrected based on detections of magnetic markers. When a magnetic marker is detected, the system uses it as a reference point to reset and correct the inertial navigation calculation, preventing error accumulation. This feedback loop maintains both continuous positioning capability and long-term accuracy.
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 system provides stable and accurate vehicle positioning by using magnetic markers and inertial navigation, ensuring reliable driving assist control even in environments where GPS signals are unreliable, such as tunnels and between buildings.
Implementation Method 1
a magnetic detection part provided to a vehicle to detect a magnetic marker laid in a road
Data Source
AI summary
A marker system (1) including a sensor array (21) for detecting a magnetic marker laid in a road, a tag reader (34) which acquires marker position information indicating a laying position of the magnetic marker, an IMU (22) which estimates a relative position of a vehicle by inertial navigation calculation, and a control unit (32) which performs an arithmetic process for identifying a position of the vehicle based on the laying position of the detected magnetic marker, and also identifies the position of the vehicle after passage over the magnetic marker based on a relative position of the vehicle estimated by the IMU (22), thereby allowing stable identification of its own vehicle position without being affected by surrounding environment.