Dual-Sensor Traffic-Crossing Detection for Flexible Pole Installation
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Solution Overview
Problem
Existing road sensing systems face challenges in installing sensors near pedestrian crossings due to the lack of suitable support members, leading to increased construction costs and restricted installation positions, which limits the detection area and precision.
Innovation Solution
A detection system comprising a first sensor with a first detection area and a second sensor with a different detection characteristic, installed on a traffic light pole, allowing for overlapping detection areas and increased installation flexibility, enabling wider area coverage without the need for new support structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If sensors are installed at positions away from the target pedestrian crossing to use existing support members, then installation cost is reduced and installation freedom is improved, but the detection area coverage is insufficient and detection precision deteriorates
Solution Approach 1:
The detection system divides the monitoring area into two distinct detection zones: a first detection target area covering the wait area adjacent to the pedestrian crossing, and a second detection target area covering the pedestrian crossing itself. This segmentation allows each sensor to be optimized for its specific zone while working together to provide comprehensive coverage, resolving the contradiction between installation position flexibility and detection precision.
Solution Approach 2:
The detection system uses a composite sensor configuration where an image sensor and a millimeter-wave sensor work together to perform multiple detection functions. The image sensor detects objects in the wait area while the millimeter-wave sensor detects objects in the pedestrian crossing, creating a universal detection system that maintains high precision across different zones without requiring sensors to be positioned directly over the pedestrian crossing.
2Adaptability or versatility
If sensors are installed away from the target pedestrian crossing, then installation freedom is improved and construction costs are reduced, but the detection area coverage is limited
Solution Approach 1:
The system extends detection coverage by utilizing the spatial dimension created by positioning sensors at different locations with different detection characteristics. The image sensor provides wide-area coverage of the wait area from an adjacent position, while the millimeter-wave sensor covers the pedestrian crossing from the same support structure, effectively using dimensional separation to expand total detection area without requiring direct positioning over the crossing.
Solution Approach 2:
The detection system merges the detection capabilities of two different sensor types (image sensor and millimeter-wave sensor) positioned at the same support structure but detecting different areas. This combination allows the system to achieve extensive detection area coverage by integrating data from both sensors, effectively expanding the total monitored area beyond what a single sensor position could provide.
3Measurement precision
If multiple sensors with different detection characteristics are used to cover different areas, then detection precision is improved, but the device complexity increases
Solution Approach 1:
The system merges multiple sensors with different detection characteristics (image sensor and millimeter-wave sensor) into a coordinated detection network. Each sensor type contributes its unique detection capabilities to the overall system, with the image sensor providing visual detection in the wait area and the millimeter-wave sensor providing detection in the pedestrian crossing, achieving enhanced precision through their combined operation.
Solution Approach 2:
The system segments the detection function across two different sensor types, with each sensor dedicated to a specific detection zone. This functional segmentation allows each sensor to be optimized for its designated area while the system as a whole achieves comprehensive detection precision through the coordinated operation of these segmented detection functions.
Data Source
AI summary
This detection system comprises: a first sensor that is installed above a first area adjacent to a pedestrian crossing such that a first detection area in which the first sensor detects objects includes at least part of the first area; and a second sensor that has detection properties differing from those of the first sensor and is installed above the first area and such that a second detection area in which the second sensor detects objects includes at least part of pedestrian crossing.