Ultrasonic Object Detection with Peak Pairing Against Clutter
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Solution Overview
Problem
Existing object detection systems face challenges in accurately detecting information related to objects while minimizing the influence of clutter caused by reflections from unwanted objects.
Innovation Solution
The system employs multiple object detection devices that transmit encoded ultrasonic waves simultaneously, allowing for the identification of transmission sources and detection of object information based on the correspondence relationship between peaks in waveforms from different devices, thereby distinguishing reflections from the desired object from clutter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple object detection devices transmit waves simultaneously, then detection coverage and accuracy are improved, but clutter from unwanted reflections increases
Solution Approach 1:
The system segments the detection process by dividing the plurality of object detection devices into pairs, where each device transmits to its paired device. This segmentation allows the system to process and identify correspondence relationships between specific transmission-reception pairs, enabling accurate object detection while filtering out clutter from unwanted reflections through the identification unit that recognizes which surges correspond to which transmission sources.
2Measurement precision
If correlation values are calculated between transmission and reception waves, then distance detection is achieved, but influence from clutter cannot be avoided
Solution Approach 1:
The system implements feedback through the identification unit that analyzes reception waves to identify transmission sources, and the detection unit that uses this identification to select appropriate correlation values. The detection unit receives feedback about which surges are from wanted objects versus clutter, and adjusts its processing accordingly by calculating correlation values only for identified valid transmission-reception pairs, thereby maintaining reliability under clutter influence.
3Loss of information
If information from multiple transmission sources is processed, then detection completeness is improved, but identification of valid signals becomes more difficult
Solution Approach 1:
The identification unit serves as an intermediary between the reception unit that receives mixed signals from multiple transmission sources and the detection unit that processes correlation values. This intermediary identifies and tags each surge with its transmission source information, organizing the complex multi-source data into structured pairs. This intermediary processing layer simplifies the overall system by handling the identification complexity in a dedicated component, allowing the detection unit to focus on accurate distance measurement without being burdened by signal identification complexity.
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
This approach enhances the accuracy of object detection by focusing on the correspondence relationship between peaks in waveforms from paired detection devices, effectively reducing the impact of clutter and improving the precision of distance measurements.
Implementation Method 1
a transmission unit configured to transmit a transmission wave substantially at the same time with another transmission unit provided in another object detection device
Implementation Method 2
a distance to the object is detected as one piece of information related to the object by a time of flight (TOF) method
Data Source
AI summary
An object detection device includes: a transmission unit transmitting a transmission wave substantially at the same time with another transmission unit in another object detection device; a reception unit receiving a reception wave including surges corresponding to a result of return of the transmission wave by the transmission unit and another transmission wave by the another transmission unit in accordance with reflection by an object; an identification unit identifying a transmission source of the surges included in the reception wave; and a detection unit detecting information related to the object based on a correspondence relationship between a first peak of a first waveform indicating a first surge transmitted by the another transmission unit and received by the reception unit and a second peak of a second waveform indicating a second surge transmitted by the transmission unit and received by another reception unit provided in the another object detection device.