Ultrasonic Object Detection Using Multi-Frequency Amplitude Analysis
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing object detection devices struggle to accurately distinguish between obstacles that may come into contact with a vehicle, such as walls, and those that are unlikely to, like wheel chocks, due to limitations in differentiating peak values of reflected ultrasound waves.
Innovation Solution
The device transmits ultrasonic waves at multiple frequencies, extracts amplitudes for each frequency, and determines object type based on the relationship between these amplitudes, leveraging the change in directivity with frequency to differentiate between obstacle objects and other objects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If single-frequency ultrasonic waves are transmitted, then the device complexity is low, but the measurement precision of object type differentiation is insufficient
Solution Approach 1:
The patent transmits ultrasonic waves at multiple frequencies (e.g., 40 kHz and 80 kHz) and analyzes the relationship between amplitudes at different frequencies to differentiate object types. This changes the frequency parameter of the transmitted waves to enable better discrimination between obstacles like walls and wheel chocks, resolving the contradiction between measurement precision and device complexity.
2Reliability
If peak value comparison method is used, then the device structure is simple, but the reliability of obstacle classification is insufficient
Solution Approach 1:
Instead of comparing peak values at a single frequency, the patent compares amplitudes at multiple frequencies (e.g., A1 at 40 kHz and A2 at 80 kHz). This parameter change in the signal analysis method significantly improves the reliability of obstacle classification, enabling the system to reliably distinguish between walls and wheel chocks.
3Measurement precision
If multiple frequencies are transmitted, then the measurement precision of object differentiation is improved, but the use of energy increases
Solution Approach 1:
The patent transmits ultrasonic waves at multiple discrete frequencies (e.g., 40 kHz and 80 kHz) rather than continuous frequencies. This approach improves measurement precision for object differentiation while controlling energy consumption by limiting the number of frequency points, thus resolving the contradiction between measurement precision and energy usage.
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 reducing the influence of atmospheric fluctuations and improves the ability to identify potential collision hazards, thereby preventing unnecessary actions.
Implementation Method 1
a transmitter/receiver 30 that transmits and receives ultrasonic waves
Implementation Method 2
receives the reflected waves of the search waves arriving from the direction of the detection area after being reflected by the object to be detected
Implementation Method 3
the drive signal has at least two frequencies... The judging unit extracts at least two amplitudes corresponding to the at least two frequencies
Data Source
AI summary
In an object detection device, a signal generation unit generates a drive signal, a transmission unit transmits an ultrasonic wave as a search wave in response to the input drive signal, and a reception unit receives an ultrasonic wave to generate a received signal. A judging unit performs object detection determination based on the received signal. The drive signal has at least two frequencies, and the judging unit extracts at least two amplitudes corresponding to the at least two frequencies from the received signal, and performs determination based on a relationship between the at least two amplitudes.