Configurable Hysteresis Module for FMCW Radar Interference Mitigation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Simultaneous operation of multiple radars in a limited region causes interference, leading to signal-to-noise ratio degradation and ghost object formation in FMCW radar systems, which current systems fail to accurately identify and mitigate.
Innovation Solution
A radar system with configurable receiver circuitry and integrated circuits that include interference detection, hysteresis, and mitigation modules to detect and adjust interference indicators, using threshold-based analysis and buffer configurations to refine interference identification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Difficulty of detecting and measuring
If current radar systems measure power variation in the signal band during a chirp to identify interference, then interference detection capability is provided, but measurement precision deteriorates because the measurements are corrupted by reflected signals also present in the signal band
Solution Approach 1:
The patent segments the interference detection process into multiple measurement phases: a first set of measurements taken during a first chirp when interference is expected to be absent, and a second set of measurements taken during a second chirp when interference is present. By separating the measurement processes in time and correlating them with different interference conditions, the system can distinguish interference-induced power variations from those caused by reflected signals, thereby improving measurement precision while maintaining interference detection capability.
2Productivity
If multiple radars operate simultaneously in a limited region, then radar system productivity is improved, but signal-to-noise ratio deteriorates due to interference causing degradation and ghost objects
Solution Approach 1:
The patent implements a feedback mechanism where the radar system continuously monitors power variations in the signal band during chirps and uses this information to identify interference conditions. By detecting interference through power variation measurements and using this feedback to adjust processing (such as identifying and mitigating ghost objects or adjusting transmission parameters), the system can maintain reliable operation even when multiple radars operate simultaneously, thus preserving signal-to-noise ratio while allowing high productivity.
Data Source
AI summary
Radar systems, methods, and integrated circuits mitigate interference. An example radar system includes receiver circuitry to receive a radar signal and to convert the radar signal, using ADC circuitry, to a digital radar signal comprised of a plurality of data samples each having a digital value. A buffer of the example radar system sequentially receives and stores multiple data samples of the plurality of data samples, the multiple data samples including a test data sample, a first number of data samples received before the test data sample, and a second number of data samples received after the test data sample. The radar system further includes analysis circuitry to determine a statistic for the multiple data samples, and comparison circuitry to compare the test data sample to a threshold and output a processed data sample having a digital value that is based on a result of the comparison circuitry.