Object Detection Apparatus Multiple Reflection Determiner
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Solution Overview
Problem
Existing object detecting apparatuses for vehicles are limited in detecting multiple objects and can incorrectly calculate the position of objects due to multiple reflection, leading to potential false braking controls.
Innovation Solution
An object detecting apparatus that uses multiple distance measuring sensors to transmit probe waves and receive reflected waves, with a multiple reflection determiner to identify and exclude multiply reflected waves from position calculations, ensuring accurate detection of objects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple reflected waves are used to detect objects, then the detection capability for multiple objects is improved, but the measurement precision deteriorates due to multiple reflection causing incorrect position calculations
Solution Approach 1:
The patent extracts and separates the harmful multiple reflected waves from the useful direct reflected waves. By identifying reflected waves with specific characteristics (arrival time, amplitude, phase) that indicate multiple reflection, the system extracts only the valid direct waves for position calculation, thereby maintaining measurement precision while still utilizing multiple reflected waves for enhanced detection capability.
Solution Approach 2:
The patent introduces an intermediary processing mechanism that analyzes the characteristics of reflected waves before using them for position calculation. This intermediary layer filters out multiple reflected waves based on their temporal, amplitude, and phase properties, allowing the system to benefit from multiple object detection while preventing position calculation errors.
2Measurement precision
If only the first reflected wave is used for position calculation, then the measurement precision is maintained, but the detection capability for multiple objects is limited
Solution Approach 1:
The patent segments the reflected wave signals into distinct components: direct reflected waves from closest objects and multiple reflected waves from farther objects. By segmenting these signals based on arrival time and wave characteristics, the system can process multiple objects simultaneously while maintaining position calculation accuracy for each object using its corresponding direct wave.
Solution Approach 2:
The patent adds temporal and amplitude dimensions to the wave analysis. Instead of using only the first reflected wave, the system analyzes multiple reflected waves across different time dimensions and amplitude levels, enabling detection of multiple objects at different distances while maintaining precision by selecting appropriate waves for position calculation.
3Area of stationary object
If reflected waves from farther objects are used for detection, then the detection range is extended, but false braking controls may occur due to incorrect position calculations
Solution Approach 1:
The patent implements a feedback mechanism that continuously monitors the characteristics of reflected waves. By analyzing the temporal, amplitude, and phase properties of received waves, the system provides feedback to identify multiple reflected waves and exclude them from position calculations, preventing false braking controls while maintaining extended detection range.
Solution Approach 2:
The patent converts the harmful effect of multiple reflection into a beneficial detection capability. By analyzing the patterns of multiple reflected waves, the system can identify their presence and use this information to distinguish between real objects at different distances and false echoes, thereby extending detection range while maintaining braking control reliability.
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 and prevents false braking controls by distinguishing between direct and multiply reflected waves, improving the reliability of object positioning and contact avoidance systems.
Implementation Method 1
receiving a reflected wave of the probe waves as detected information of the object
Data Source
AI summary
An object detecting apparatus includes a distance calculator that calculates a distance to the object, a wave height acquirer that acquires a respective peak value of the plurality of reflected waves, and multiple reflection determiner. When a reflected wave for which a first distance to the object is calculated to be the smallest in the reflected waves is defined as a first wave, and another reflected wave to which a second distance is calculated as twice or more integer times the first distance calculated for the first wave and a difference of the peak value relative to the first wave which is larger than a predetermined value is present in the reflected waves, the multiple reflection determiner determines that multiple reflection is occurring in a second wave or thereafter.