Phase Unwrapping Signal Processing for EMI Reduction
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Solution Overview
Problem
Detection devices in autonomous vehicles emit electromagnetic waves that can interfere with other electronic devices, causing electromagnetic interference (EMI) and compromising their operation, especially due to the use of high-frequency electrical signals.
Innovation Solution
The use of multiple different frequencies, specifically 'allowed' frequencies that are not used by other electronic devices, such as 18.26 to 18.33 MHz and 23.01 to 23.85 MHz, to mitigate interference, combined with a phase unwrapping process to accurately determine object locations without ambiguity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high-frequency electrical signals are used for detection, then detection precision is improved, but electromagnetic interference with other electronic devices increases
Solution Approach 1:
The patent changes the frequency parameter of the electrical signals used in detection. Specifically, it uses frequencies in the ranges of 18.26-18.33 MHz and 23.01-23.85 MHz, which are lower than conventional high-frequency signals but still provide adequate detection precision while significantly reducing electromagnetic interference with other electronic devices.
2Reliability
If multiple frequencies are used to reduce interference, then electromagnetic compatibility is improved, but device complexity increases
Solution Approach 1:
The patent implements a flexible frequency selection mechanism that allows the detection device to dynamically switch between different frequency ranges (18.26-18.33 MHz and 23.01-23.85 MHz) based on the operational environment and regulatory requirements. This dynamic approach enables the system to maintain electromagnetic compatibility while managing complexity through adaptive rather than static multi-frequency operation.
Data Source
AI summary
The present disclosure is directed to a detection device that avoids using frequencies that can potentially interfere with the operation of other electronic devices. An apparatus consistent with the present disclosure may use electrical signals of different frequencies to generate sensing signals that may be electromagnetic signals in the light spectra, for example, infrared signals may be used. Operational frequencies selected may include at least one frequency that is represented as an irrational number.