Vehicle Object Detection Using Radar-Image Speed Verification
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Solution Overview
Problem
Collision avoidance systems for vehicles often erroneously determine a preceding vehicle and a metallic object, such as a manhole cover, as identical targets due to their positional relationship, leading to incorrect warnings or automatic braking applications.
Innovation Solution
An object detection apparatus that combines radar and image capture devices to determine target identity, incorporating a section to prevent erroneous mitigation control by monitoring the monotonic change in distance between detected targets over a predetermined interval, thus distinguishing between the vehicle and the metallic object based on differing speeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the identical-target determination section determines targets as identical based on positional relationship, then target detection accuracy is improved, but erroneous determination between preceding vehicle and metallic object occurs
Solution Approach 1:
The system transitions from a static positional relationship check to a dynamic speed-based verification. The execution prevention section continuously monitors the relative speed between radar-detection target and image-detection target, using speed differential as a dynamic criterion to prevent erroneous determination when objects move at different velocities, thereby resolving the contradiction between detection accuracy and determination reliability
Solution Approach 2:
The execution prevention section implements a feedback mechanism by continuously comparing the speeds of radar-detected and image-detected targets. When speed differences exceed a threshold, the system feeds back to override the identical-target determination, preventing erroneous braking. This feedback loop maintains high detection accuracy while eliminating false positives caused by stationary metallic objects
2Reliability
If mitigation control is executed based on identical-target determination, then collision avoidance is improved, but erroneous automatic braking occurs
Solution Approach 1:
The execution prevention section performs preliminary verification of target identity by checking speed consistency before mitigation control is activated. By preemptively identifying speed mismatches between radar and image targets, the system prevents erroneous braking commands from being generated, thus eliminating harmful false alarms while preserving genuine collision avoidance capabilities
Solution Approach 2:
The execution prevention section acts as an intermediary between the identical-target determination section and the collision mitigation section. It introduces an additional verification layer that checks speed differential, allowing the system to block erroneous mitigation control while permitting valid collision avoidance actions, thereby eliminating harmful false alarms
3Measurement precision
If radar and image capture device are used for target detection, then detection capability is improved, but target identity differentiation becomes difficult
Solution Approach 1:
The system changes the parameter used for target differentiation from spatial position alone to a combination of position and speed. By incorporating velocity information from the radar apparatus into the identity verification process, the system easily distinguishes between moving vehicles and stationary metallic objects, resolving the differentiation difficulty without adding complex device architecture
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 automatic braking by accurately differentiating between a preceding vehicle and a metallic object, reducing false alarms and ensuring safe vehicle operation.
Implementation Method 1
a radar apparatus transmits scanning waves ahead of an own vehicle in the travel direction of the own vehicle and receives reflected waves reflected from a target
Data Source
AI summary
An object detection apparatus includes a radar apparatus, an image capture device, a radar-detection target position detection section, and an image-detection target position detection section. In the apparatus, it is determined that the radar-detection target and the image-detection target are identical when a positional relationship between the targets corresponds to a predetermined relationship. Mitigation control for mitigating a collision between the own vehicle and an identical target is executed when the radar-detection target and the image-detection target are determined to be identical and the distance between the own vehicle and the identical target is smaller than a predetermined distance. Execution of the mitigation control is prevented from being executed, when the distance between the radar-detection target and the image-detection target has increased or decreased monotonically for an interval longer than a predetermined interval.