Ultrasonic Object Detection Ghost Elimination
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Solution Overview
Problem
Existing object detection systems for vehicles can only detect one object per cycle and fail to accurately identify multiple objects, leading to potential collisions when a closer object is outside the vehicle width but another object within the vehicle width area is not detected.
Innovation Solution
An object detection apparatus that uses overlapping detection areas from multiple ultrasonic sensors to calculate the position of objects using triangulation methods, distinguishing between real objects and ghosts by analyzing differences in reception times of direct and indirect waves, ensuring correct detection of multiple objects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If only one object is detected per object-detection cycle using a single distance sensor, then the detection system is simple and fast, but multiple objects cannot be detected simultaneously leading to potential collision risks
Solution Approach 1:
The detection process is segmented into multiple cycles: first cycle detects closest object, second cycle detects additional objects. This segmentation allows the system to detect multiple objects while maintaining simple per-cycle operation, resolving the contradiction between detection completeness and detection speed.
Solution Approach 2:
The system performs preliminary detection in the first object-detection cycle to identify the closest object, then uses this information to guide subsequent detection cycles. This preliminary action enables faster subsequent detections while ensuring no objects are missed, improving both reliability and productivity.
2Reliability
If the detection area of multiple sensors is increased to cover more objects, then more objects can be detected, but the detection areas overlap causing ghost detections
Solution Approach 1:
The system uses feedback from the first object-detection cycle to adjust the detection strategy in the second cycle. By comparing results across cycles and using the closest object's position information, the system can distinguish real objects from ghost detections, maintaining both detection completeness and position accuracy.
Solution Approach 2:
The closest object detected in the first cycle serves as an intermediary reference point. The system uses this reference to evaluate and validate detections in subsequent cycles, enabling accurate distinction between real objects and ghost detections while maintaining comprehensive detection coverage.
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 accurate detection of multiple objects in the vicinity of a vehicle, reducing the risk of collision by correctly identifying real objects and avoiding false ghost determinations, thereby enhancing vehicle safety.
Implementation Method 1
transmitting first probing waves from a first position and subsequently transmitting second probing waves from a second position different from the first position
Implementation Method 2
receiving reflected versions of the first and second probing waves as detection data of the object
Implementation Method 3
calculates the position of an object in the vehicle width direction using a triangulation method
Data Source
AI summary
An object detection apparatus includes a first acquisition unit that acquires, as a first direct wave group, reflected versions of first probing waves transmitted from and received at a first position, and acquires, as a first indirect wave group reflected versions of the first probing waves received at a second position, a second acquisition unit that acquires, as a second indirect wave group, reflected versions of second probing waves transmitted from the second position and received at the first position, and acquires, as a second direct wave group, reflected versions of the second probing wave received at the second position, and a determination unit that determines whether the object is a real object or a ghost in accordance with the receptions times of the first and second direct wave groups and the first and second indirect wave groups.