Vehicle Radar Misalignment Correction via Dual-Target Comparison
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Solution Overview
Problem
Radar misalignment on vehicles can lead to inaccurate detection of target vehicles, resulting in incorrect or missed warnings due to the difficulty in accurately determining the mounting angle error using vehicle speed sensors and yaw rate sensors, especially when targets are close to the radar.
Innovation Solution
A radar alignment apparatus and method that uses two radars spaced apart on a vehicle to detect and correct misalignment by calculating target information, comparing distances and speeds, and adjusting angles to ensure accurate alignment, thereby preventing incorrect warnings and ensuring safe driving.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If vehicle speed sensor and yaw rate sensor are used to correct radar mounting angle error, then correction can be performed, but accurate determination of the angle is difficult when targets are positioned too close to the radar
Solution Approach 1:
The patent introduces a third radar as an intermediary device to measure the mounting angle error. Instead of relying on vehicle speed sensor and yaw rate sensor which become inaccurate for close targets, the third radar directly measures the angular position of targets to calculate the mounting angle error of the first and second radars. This intermediary measurement approach resolves the accuracy issue for close targets.
2Productivity
If radar mounting angle is not corrected, then the system operates continuously, but misalignment causes inaccurate target information and generates incorrect warnings or fails to generate warnings when needed
Solution Approach 1:
The patent implements a feedback mechanism where the third radar continuously measures target angular positions, the controller calculates mounting angle errors based on these measurements, and the system automatically corrects the errors by adjusting radar mounting angles or coordinate values. This closed-loop feedback ensures continuous reliable operation without manual intervention while maintaining accurate warning generation throughout the vehicle's lifespan.
Solution Approach 2:
The radar system performs self-diagnosis and self-correction of mounting angle errors using the third radar for measurement and the controller for calculation and adjustment. The system automatically detects misalignment, calculates correction values, and applies corrections without requiring external verification or manual intervention, enabling the radar to self-maintain accuracy throughout its operational life.
3Measurement precision
If manual verification and correction of radar mounting angle is performed regularly, then accuracy can be maintained, but the radar operates without verification during normal operation
Solution Approach 1:
The system employs the third radar to automatically monitor and detect mounting angle errors of the first and second radars during normal operation. The controller continuously calculates error values based on angular position measurements and automatically corrects these errors by adjusting mounting angles or coordinate analysis values. This self-service mechanism eliminates the need for manual verification while maintaining continuous accuracy.
Solution Approach 2:
The patent enables continuous automatic detection and correction of mounting angle errors throughout the radar's operational life. The third radar continuously measures target angular positions, the controller continuously calculates errors, and corrections are continuously applied. This continuous automated process replaces intermittent manual verification, ensuring constant accuracy without stopping vehicle operation or requiring service intervention.
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 solution automatically corrects radar misalignment, preventing incorrect warnings and ensuring accurate detection of target vehicles, thereby enhancing vehicle safety by maintaining precise radar alignment during operation.
Implementation Method 1
calculating a first target information comprising a first distance to, a first speed, and an first angle of a first target by using a first radar provided on a vehicle
Data Source
AI summary
A method of controlling a radar alignment apparatus includes calculating a first target information by using a first radar and a second target information by using a second radar spaced apart from the first radar on a vehicle by a predetermined interval. The method includes determining whether the first target and the second target are a same target based on comparing at least some of the first target information with the second target, and determining whether misalignment exists in at least one of the first radar and the second radar based on a comparison of a first angle included a first target information with a second angle included in a second target information, correcting the misalignment by using the first target information and the second target information when it is determined that the misalignment exists in at least one of the first radar and the second radar.