Configurable Hysteresis for FMCW Radar Interference Mitigation
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Solution Overview
Problem
Multiple radars operating simultaneously in a limited region cause interference, leading to signal-to-noise ratio degradation and ghost object formation in FMCW radar systems, which current systems fail to accurately detect and mitigate due to corrupted interference measurements.
Innovation Solution
A FMCW radar system with an interference detection module, hysteresis module, and mitigation module that adjusts radar reflection signal portions based on a hysteresis configuration to identify and mitigate interference effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If current radar systems measure power variation in the signal band during a chirp to identify interference, then interference detection is performed in real-time, but the measurements are corrupted by reflected signals present in the signal band
Solution Approach 1:
The patent divides the signal band into multiple frequency sub-bands and processes each sub-band separately. This segmentation allows the system to identify interference in specific frequency regions without being corrupted by reflected signals present in other frequency regions, thereby improving both interference detection reliability and measurement precision.
Solution Approach 2:
The patent introduces an intermediary processing stage that separates the interference detection function from the reflected signal measurement. By using frequency-domain analysis and selective filtering as intermediary steps, the system can extract interference characteristics while excluding reflected signal components that would otherwise corrupt the measurements.
2Productivity
If multiple radars operate simultaneously in a limited region, then radar system productivity is maintained, but interference occurs causing signal-to-noise ratio degradation and ghost object formation
Solution Approach 1:
The patent implements a feedback mechanism where the radar system continuously monitors the signal band for interference characteristics, identifies interfering radars, and adjusts its operation accordingly. This feedback loop enables multiple radars to operate simultaneously while maintaining signal-to-noise ratio by allowing each radar to adapt to the presence of others based on real-time interference detection.
Data Source
AI summary
A frequency-modulated continuous wave (FMCW) radar system is presented. The FMCW radar system includes a receiver configured to receive a radar reflection signal. The radar system further includes an interference detection module, which is configured to identify a portion of the radar reflection signal corresponding to the time period during which the radar reflection signal exceeds a threshold. The FMCW radar system further includes a hysteresis module configured to adjust the identified portion of the radar reflection signal based on the portion of the signal and a hysteresis configuration. The FMCW radar system further includes a mitigation module configured to mitigate interference based on the output of the hysteresis module.