Multi-Channel Radar Thresholding for Phase Noise Correlation
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Solution Overview
Problem
Radar systems face false target detections due to excess phase noise, leading to sensitivity loss, dynamic range reduction, and resolution issues, particularly in automotive radar systems for advanced driver assistance systems (ADAS), as existing CFAR detectors assume uncorrelated noise which is invalidated by phase noise dominance.
Innovation Solution
A radar system with multiple receive channels and stages, including a noise correlation determination unit to adjust the detector threshold based on noise correlation levels, reducing false detections by accounting for phase noise correlation between channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a fixed detector threshold is used in radar detection, then the detection process is simple and fast, but false target detections increase due to excess phase noise
Solution Approach 1:
The detector threshold is changed from a fixed value to a dynamic value that adapts to the noise correlation level. The threshold adjustment unit modifies the threshold based on the determined noise correlation, allowing the detection system to respond to changing noise conditions and reduce false detections while maintaining detection speed.
Solution Approach 2:
The detector threshold parameter is adjusted based on the noise correlation level. By changing the threshold parameter dynamically according to the noise characteristics, the system achieves both fast detection (by maintaining a reasonable baseline threshold) and high reliability (by adapting to noise conditions to reduce false alarms).
2Device complexity
If noise correlation is not considered in detection, then the detection process is simple, but sensitivity is lost due to phase noise
Solution Approach 1:
The noise correlation level is determined before the final detection decision is made. This preliminary analysis of noise characteristics allows the system to adjust the detector threshold in advance, preserving detection sensitivity without adding significant complexity to the overall detection process.
3Reliability
If detector threshold is adjusted to reduce false detections, then detection accuracy improves, but detection sensitivity may be reduced
Solution Approach 1:
The detector threshold is dynamically adjusted based on the noise correlation level rather than being fixed. This allows the system to optimize the threshold for each detection scenario, improving accuracy by reducing false detections while maintaining sensitivity by adapting to the actual noise conditions rather than using a conservative fixed threshold.
Data Source
AI summary
In accordance with a first aspect of the present disclosure, a radar system is provided, comprising: a plurality of receive channels; a first radar detector stage configured to detect, through said receive channels, at least one target using a detector threshold; a noise correlation determination unit configured to determine a noise correlation level indicative of noise correlation between the receive channels if the first radar detector stage has detected the target; a detector threshold adjustment unit configured to adjust the detector threshold in dependence on the noise correlation level determined by the noise correlation determination unit; a second radar detector stage configured to detect the target using the adjusted detector threshold. In accordance with a second aspect of the present disclosure, a corresponding method of operating a radar system is conceived.