Tilt-Aware Distance Measurement for Reliable Obstacle Detection
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Solution Overview
Problem
Existing methods for correcting distance measurements by tilted distance sensors in movable objects fail to prevent erroneous detection when the tilt angle is large, leading to incorrect identification of obstacles.
Innovation Solution
A movable object equipped with a distance measurement part and an orientation measurement part, along with a control device that calculates a valid range based on the orientation angle to invalidate measurement values outside this range, preventing erroneous detection by replacing them with indefinite data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If distance correction is performed based on tilt angle, then measurement accuracy is improved for small tilts, but erroneous detection occurs when tilt angle is large
Solution Approach 1:
The detection range is segmented into a valid range and an invalid range based on the tilt angle. By dividing the measurement space and applying different validity rules to different segments, the system maintains accurate measurements within the valid range while filtering out erroneous measurements in the invalid range, thus resolving the contradiction between measurement accuracy and detection reliability.
Solution Approach 2:
The system changes the parameter of measurement validity based on the tilt angle threshold. When the tilt angle exceeds a predetermined threshold, the measurement is transitioned from valid to invalid state. This parameter change approach allows the system to adapt measurement reliability dynamically according to tilt conditions, preventing erroneous detection while maintaining accuracy within acceptable tilt ranges.
2Device complexity
If all measurement values are used for control, then processing is simplified, but erroneous detection occurs due to tilt
Solution Approach 1:
The system performs preliminary validation of measurement values by comparing the tilt angle against a predetermined threshold before using the measurements for control. This preliminary action filters out potentially erroneous measurements in advance, ensuring that only valid measurements are used for obstacle detection and control decisions, thereby maintaining reliability without significantly increasing control process 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
Prevents erroneous detection by ensuring only valid measurement values are used, simplifying the control process and maintaining accurate obstacle detection.
Implementation Method 1
a distance measurement part configured to measure a distance to a physical object
Implementation Method 2
an orientation measurement part configured to measure an orientation angle of the vehicle body
Data Source
AI summary
A movable object includes: a vehicle body; a distance measurement part configured to measure a distance to a physical object; an orientation measurement part configured to measure an orientation angle of the vehicle body; and a control device connected to the distance measurement part and the orientation measurement part. The control device acquires a measurement value of a detection range from the distance measurement part, calculates a valid range of the detection range on the basis of the orientation angle acquired from the orientation measurement part, and invalidates the measurement value of an invalid range not included in the valid range.