Rotatable Infrastructure Sensor Arm Position Correction
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Solution Overview
Problem
Infrastructure sensors used in traffic monitoring, mounted to arms extending from poles, face accuracy issues when the arm rotates due to wind or vibration, causing shifts in installation position and leading to inaccurate vehicle detection.
Innovation Solution
An object detection system incorporating an infrastructure sensor with a rotatable arm and an angle sensor or gyro sensor to detect the rotation angle, allowing for correction of detected object positions based on the arm's rotation relative to the stationary object, thereby maintaining accurate detection even when the installation position shifts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the infrastructure sensor is mounted on a rotatable arm to enable detection over a wide area, then the detection coverage is improved, but the installation position shifts due to arm rotation causing detection accuracy to deteriorate
Solution Approach 1:
The angle sensor continuously monitors the arm's rotation angle and feeds this information back to the correction unit. The correction unit uses this feedback to calculate and apply position correction to the detected object coordinates, ensuring accurate detection despite arm rotation.
Solution Approach 2:
The system changes the parameter of the detection coordinate system by applying rotation correction based on the arm's rotation angle. The correction unit transforms the detected object position from the sensor's local coordinate system to the global coordinate system, compensating for the arm's rotational displacement.
2Adaptability or versatility
If the arm is made rotatable to track moving vehicles, then the adaptability to vehicle movement is improved, but the stability of the installation position deteriorates
Solution Approach 1:
The angle sensor provides continuous feedback on the arm's rotation state, allowing the correction unit to dynamically adjust the detected object positions. This feedback mechanism enables the system to adapt to arm rotation while maintaining detection accuracy through real-time correction.
Solution Approach 2:
The system embraces the dynamic nature of the rotatable arm by implementing real-time position correction. Instead of attempting to stabilize the arm, the system dynamically compensates for its movement, allowing the arm to rotate freely while maintaining accurate object detection through continuous correction based on angle sensor data.
3Measurement precision
If multiple sensors are added to detect rotation angle for position correction, then the detection accuracy is improved, but the device complexity increases
Solution Approach 1:
The angle sensor acts as an intermediary that measures the arm's rotation and translates this information into correction data. This intermediary measurement enables the correction unit to adjust object positions without requiring direct complex positioning systems, simplifying the overall architecture while maintaining accuracy.
Solution Approach 2:
Instead of using complex mechanical positioning systems or multiple sensors to track the arm's movement, the patent substitutes a simpler angle sensor that measures rotation angle. This substitution reduces device complexity by replacing mechanical position tracking with angular measurement, which is then used to calculate position corrections.
Data Source
AI summary
This object detection system includes: an infrastructure sensor mounted to an arm extending from a stationary object fixed to a road surface or equipment, the arm being rotatable in a circumferential direction of the stationary object; and an angle sensor disposed at a place where the arm is connected to the stationary object, the angle sensor being configured to detect a rotation angle of the arm. The infrastructure sensor includes: a detection unit configured to detect a position of an object present in a detection target area of the infrastructure sensor; and a correction unit configured to correct the position of the object detected by the detection unit, based on the rotation angle detected by the angle sensor.