Marker-Based Axial Deviation Detection for Radar Calibration
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Solution Overview
Problem
Existing technologies lack a method to effectively detect and correct axial deviations in the radio wave or optical axes of radar and camera units in movable bodies, such as vehicles, leading to position and direction errors during minor collisions.
Innovation Solution
A movable body equipped with a surroundings detector and markers outside its field of view range, using high radio-wave-reflecting markers to detect axial deviations and a calibration system to adjust the radio wave axis of radar units, and optical axis of camera units, ensuring accurate detection and calibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a radar unit is attached to the front side of a vehicle, then the radar unit can detect objects in front of the vehicle, but the radio wave axis may deviate due to minor rear-end collisions or bumps, causing position and direction errors
Solution Approach 1:
The patent applies preliminary action by pre-positioning markers outside the radar's field of view range before any collision occurs. These markers serve as reference points that allow the system to detect axial deviation after a collision has happened, enabling correction of position and direction errors without requiring real-time intervention during the collision event itself
Solution Approach 2:
The patent implements feedback by using the markers as reference points to detect changes in the radar's radio wave axis orientation. When a collision causes axial deviation, the system continuously monitors the position of markers outside the field of view and uses this feedback information to calculate and correct the deviation, maintaining accurate detection capabilities
2Reliability
If a camera unit is attached to the vehicle, then the camera can capture images of the surrounding environment, but the optical axis may deviate due to minor collisions, requiring calibration correction
Solution Approach 1:
The patent applies preliminary action by pre-positioning markers in locations that are visible to the camera but outside the normal field of view range during regular operation. These markers are placed beforehand to serve as reference points for detecting optical axis deviation after collisions, enabling post-collision calibration without requiring immediate intervention
Solution Approach 2:
The patent implements feedback by using the pre-positioned markers as reference points to detect changes in the camera's optical axis orientation. When a collision causes axial deviation, the system monitors the marker positions in captured images and uses this feedback to calculate the deviation amount and apply corrective transformations to maintain accurate spatial relationships
3Reliability
If a radio wave transmissive member is used to protect the radar unit, then dust deposition is prevented, but the radio wave axis position may deviate from the transmissive member axis, requiring calibration correction
Solution Approach 1:
The patent applies preliminary action by pre-positioning markers outside the radar's field of view range but within the field of view of the radio wave transmissive member. This allows the system to detect deviations between the radio wave axis and the transmissive member axis before they affect detection accuracy, enabling proactive calibration
Solution Approach 2:
The patent implements feedback by using the markers as reference points to continuously monitor the relative position between the radio wave axis and the transmissive member axis. When deviation is detected through marker position analysis, the system uses this feedback information to calculate correction amounts and adjust the calibration parameters, maintaining precise alignment
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
Enables precise detection and calibration of axial deviations, preventing false detections and maintaining accurate sensing capabilities even after minor collisions, thereby improving the reliability of radar and camera systems in movable bodies.
Implementation Method 1
the marker that is composed of a high radio-wave-reflecting member
Data Source
AI summary
A marker used to detect an axial deviation of a radio wave axis Ar of a radar unit is provided in front of the radar unit and outside a radar field of view range set based on a field of view angle θ of the radar unit on a vehicle. A relative position between the radar unit and the marker is different between before and after an axial deviation of the radio wave axis Ar of the radar unit occurs. Thus, an axial deviation (an amount Δθ of axial deviation in an azimuth direction and an amount Δα of axial deviation in an elevation angle direction) of the radio wave axis Ar of the radar unit can be detected by obtaining a difference in marker detection position before and after the axial deviation by the radar unit.