Ultrasonic Object Detection Doppler Shift Correction
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Solution Overview
Problem
Existing object detection systems face inaccuracies in detecting objects due to frequency transitions caused by Doppler shift, especially when the frequency transition is not appropriately considered, leading to incomplete detection of the reception wave reflected by the object.
Innovation Solution
An object detection apparatus that transmits ultrasonic waves using two frequencies within a predetermined frequency band, estimates the frequency transition due to Doppler shift through frequency analysis, corrects the reception wave to match the transmission wave, and uses this corrected wave to accurately detect object information using the TOF method.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If Doppler shift is not corrected, then device complexity is reduced, but measurement precision deteriorates due to frequency transition between transmission and reception waves
Solution Approach 1:
The system performs frequency analysis and Doppler shift estimation on the reception wave before correlation calculation. By preliminarily estimating the Doppler shift amount and correcting the reception wave's frequency characteristics, the system prepares the signal in advance to match the transmission wave's frequency, thereby improving detection accuracy without adding excessive complexity during the main detection process
Solution Approach 2:
The system changes the frequency parameter of the reception wave by applying Doppler shift correction. It estimates the Doppler shift amount based on frequency analysis results and adjusts the reception wave's frequency characteristics to compensate for the Doppler effect, enabling accurate correlation calculation even when frequency transitions occur
2Measurement precision
If frequency analysis and Doppler correction are applied, then measurement precision improves, but loss of time increases due to additional processing steps
Solution Approach 1:
The system performs frequency analysis and Doppler shift estimation as preliminary processing steps before the main correlation calculation. By preparing the corrected reception wave in advance, the system ensures that the subsequent detection process can proceed efficiently with already-corrected signals, reducing the need for iterative adjustments
Solution Approach 2:
The system maintains continuous signal processing by seamlessly integrating frequency analysis, Doppler estimation, and correction operations. The processing flow continues without interruption from reception through correction to detection, ensuring that the useful action of object detection is maintained throughout the enhanced processing pipeline
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
Ensures accurate detection of objects even under conditions of frequency transition, enhancing the reliability of object detection by canceling out the influence of Doppler shift and improving the consistency between transmission and reception waves.
Implementation Method 1
a transmitting portion configured to transmit a transmission wave based on at least two frequencies set within a range of a predetermined frequency band
Implementation Method 2
a frequency transition due to Doppler shift may occur between the transmission wave and the reception wave
Implementation Method 3
a distance to the object which is one of information related to the object is detected by, for example, TOF (Time Of Flight) method
Data Source
AI summary
An object detection apparatus includes a transmitting portion configured to transmit a transmission wave, a receiving portion configured to receive a reception wave based on the transmission wave which returned, an estimation portion configured to estimate an amount of frequency transition between the transmission wave and the reception wave on the basis of a result of a frequency analysis, a correction portion configured to correct the reception wave to obtain consistency of frequencies with the transmission wave on the basis of an estimation result of the estimation portion, and a detection portion configured to detect information related to the object on the basis of a relation between the transmission wave and the corrected reception wave corrected by the correction portion.