Obstacle Detection Misalignment Adjustment
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Solution Overview
Problem
Conventional vehicle-mounted obstacle detection systems using radar can incorrectly determine obstacles due to misalignment between the radar's axial direction and the vehicle's longitudinal direction, leading to unnecessary alert activations.
Innovation Solution
An obstacle detection apparatus that includes a misalignment detection unit to assess the degree of misalignment between the radar's axial direction and the vehicle's longitudinal direction, and an allowable range limiting unit to adjust signal output conditions, preventing unnecessary signal outputs by limiting the range of signal output criteria when misalignment exceeds a threshold.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the radar axial direction is misaligned from the vehicle longitudinal direction, then the obstacle detection coverage is improved, but false obstacle detection occurs
Solution Approach 1:
The system performs preliminary misalignment detection by analyzing the trajectory of detected obstacles across multiple frames. Before making obstacle detection judgments, the system pre-calculates the misalignment angle by tracking obstacle position changes over time, and uses this information to correct detection results or adjust alert conditions accordingly
Solution Approach 2:
The system continuously monitors obstacle trajectories and uses this feedback to determine misalignment angles. The detected misalignment information is fed back to adjust the obstacle detection logic, allowing the system to compensate for the fixed misalignment and reduce false detections while maintaining expanded coverage
2Measurement precision
If a low user-set threshold is used for alert activation, then the sensitivity of obstacle detection is improved, but unnecessary alerts are triggered due to misalignment
Solution Approach 1:
The alert threshold is made dynamic rather than fixed. The system adjusts the effective threshold based on the detected misalignment angle and the trajectory of the detected obstacle. For obstacles that appear to be off-axis due to misalignment, the system dynamically modifies the threshold conditions to prevent false alerts while maintaining sensitivity for genuine front-facing obstacles
Solution Approach 2:
The system changes the parameters used in alert determination based on misalignment detection. Instead of using a fixed low threshold that causes false alerts, the system modifies the threshold parameters dynamically according to the calculated misalignment angle and obstacle trajectory characteristics, allowing precise discrimination between real and false obstacles
Data Source
AI summary
In an obstacle detection apparatus, a signal output unit is configured to output a signal if an obstacle meets at least one preset signal output condition. A condition setting unit is configured to set at least one element of the at least one signal output condition to a value in dependence on a user entry value. A misalignment detection unit is configured to detect misalignment of an axial direction of a sensor with a longitudinal direction of a vehicle carrying the apparatus. In the apparatus, an allowable range limiting unit is configured to, if a degree of misalignment exceeds a predetermined misalignment threshold, limit an allowable range of values of the at least one element of the at least one preset signal output condition so as to make the at least one preset signal output condition less prone to be met.