Combined FMCW Radar Signal Interference Discrimination
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Solution Overview
Problem
Existing FMCW radar systems face difficulties in distinguishing between interference and real targets, leading to false detections and increased resource consumption, as the beat frequency from interference signals can be indistinguishable from those of reflective targets, especially when nearby radar devices are present.
Innovation Solution
A combined FMCW radar signal is transmitted, comprising a first and a second FMCW radar chirp with different transmission parameter values, allowing for more accurate target verification by comparing components of the received signal corresponding to both chirps, thereby enhancing the differentiation between interference and real targets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single FMCW radar chirp is transmitted, then the device complexity is low, but the measurement precision deteriorates due to inability to distinguish interference from real targets
Solution Approach 1:
The radar signal is segmented into multiple distinct chirps with different transmission parameter values (e.g., different slope values). Each chirp serves as an independent probe, allowing the system to verify target authenticity by comparing responses from multiple segments rather than relying on a single signal structure.
Solution Approach 2:
The patent changes transmission parameters (such as chirp slope, frequency range, or time duration) across different chirps. This parameter variation creates distinct expected response patterns for real targets versus interference, enabling discrimination without fundamentally altering the radar device architecture.
2Reliability
If multiple FMCW radar chirps with different parameters are transmitted, then the reliability of target detection improves, but the loss of time increases due to extended signal transmission and processing
Solution Approach 1:
Multiple chirps are transmitted in a periodic sequence with different parameter configurations. This structured periodic approach allows the system to efficiently compare responses across chirps while maintaining a predictable detection cycle, balancing verification reliability with time management.
Solution Approach 2:
The system transmits more chirps than the absolute minimum required for detection. This excessive action provides redundant verification opportunities, allowing the radar to confidently distinguish real targets from interference even when some chirps are blocked or degraded, thereby improving reliability without requiring excessively long detection cycles.
3Reliability
If traditional FMCW radar detection is used, then the resource consumption is low, but false detections occur due to interference signals being indistinguishable from real targets
Solution Approach 1:
The system uses feedback from multiple chirp responses to verify target authenticity. By comparing the consistency of detected targets across different chirps with different parameters, the radar can identify and reject false detections caused by interference, improving reliability while managing computational resources through targeted verification rather than exhaustive analysis.
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
This approach improves the reliability of target detection, reduces unnecessary actions and resource consumption, and enhances safety by accurately distinguishing between interference and real targets in environments with multiple radar devices.
Implementation Method 1
A radar device may be configured to detect proximity to an object, roadway information, a location of the vehicle
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a radar device may transmit a combined frequency modulated continuous wave (FMCW) radar signal, wherein the combined FMCW radar signal comprises: a first FMCW radar chirp generated based at least in part on a first set of transmission parameter values; and a second FMCW radar chirp generated based at least in part on a second set of transmission parameter values, wherein a transmission parameter value of the second set of transmission parameter values is different than a corresponding transmission parameter value of the first set of transmission parameter values. The radar device may detect a radar target based at least in part on a received signal corresponding to the combined FMCW radar signal and perform an action based at least in part on detecting the radar target. Numerous other aspects are provided.