Ultrasonic Object Detection Frequency Correction via Beat Segmentation
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Solution Overview
Problem
Existing object detection systems, such as ultrasonic sonars, face challenges in accurately analyzing reverberation signals for detecting objects near moving bodies due to interference from foreign matter, which affects transmission and reception characteristics, leading to decreased accuracy in abnormality detection and frequency correction.
Innovation Solution
An object detection apparatus that measures reverberation frequencies by identifying specific segments where beat occurrence is minimal, allowing for precise measurement and correction of transmission frequencies, thereby enhancing detection accuracy and reducing interference from foreign matter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If reverberation frequency measurement is performed in a conventional manner, then measurement can be continuously conducted, but measurement accuracy decreases due to beat occurrence from multiple reverberation frequency components
Solution Approach 1:
The reverberation signal is divided into multiple time segments, and the patent identifies specific segments where beat occurrence is minimal. By selecting only these suitable segments for frequency measurement, the system achieves accurate reverberation frequency measurement while avoiding the reliability issues caused by beat phenomena in other segments.
2Reliability
If foreign matter is present in the environment, then transmission and reception characteristics are affected, but the system can still operate with reduced accuracy
Solution Approach 1:
The system measures the reverberation frequency of the transceiver and uses this information to detect abnormalities. By continuously monitoring the reverberation frequency and comparing it against expected values, the system can identify when foreign matter is affecting transmission or reception characteristics, enabling reliable abnormality detection even in challenging environments.
3Measurement precision
If beat occurrence is used as an indicator, then segment selection becomes more complex, but measurement reliability improves
Solution Approach 1:
The patent performs preliminary analysis of the reverberation signal to identify segments with minimal beat occurrence before conducting frequency measurements. By pre-selecting suitable measurement segments based on beat characteristics, the system ensures reliable frequency measurements while organizing the complexity into a systematic preliminary screening process.
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
The apparatus improves the accuracy of reverberation frequency measurement and abnormality detection, maintaining effective transmission and reception characteristics even in environments with foreign matter, ensuring reliable object detection near moving bodies.
Implementation Method 1
a transceiver that externally transmits a transmission wave that is an ultrasonic wave and receives a reception wave that includes a reflected wave of the transmission wave from the object
Implementation Method 2
measures a reverberation frequency that is a frequency of a reverberation signal that is generated in a transceiver
Implementation Method 3
detects a specific segment that is an occurrence segment in which occurrence of beat that is attributed to a plurality of reverberation frequency components is confirmed in the reverberation signal
Data Source
AI summary
An object detection apparatus detects an object in a vicinity of a moving body in a state of being mounted to the moving body. The object detection apparatus measures a reverberation frequency that is a frequency of a reverberation signal that is generated in a transceiver that externally transmits a transmission wave that is an ultrasonic wave and receives a reception wave that includes a reflected wave of the transmission wave from the object. The object detection apparatus detects a specific segment that is an occurrence segment in which occurrence of beat that is attributed to a plurality of reverberation frequency components is confirmed in the reverberation signal, or a non-occurrence segment in which the occurrence of beat does not significantly occur. The object detection apparatus sets a measurement segment in which the reverberation frequency is measured in the non-occurrence segment based on a detection result of the specific segment.