FMCW Radar Interference Detection via High Pass Filtering
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Solution Overview
Problem
FMCW radar systems face interference issues due to shared frequency and bandwidth usage with other radar systems, leading to false targets and reduced dynamic range, particularly in medium and short-range applications, where interference detection and mitigation are crucial for maintaining system performance.
Innovation Solution
A data processing device employing a high pass filter with a cut-off frequency aligned to the distance beyond which signal power is below noise levels, categorizing interference intensity and removing interfered signal parts to enhance interference detection and mitigation in FMCW radar systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If FMCW radar systems use shared frequency and bandwidth with other radar systems, then spectrum utilization is improved, but interference between radars increases causing false targets and reduced dynamic range
Solution Approach 1:
The patent applies preliminary action by performing interference detection through high pass filtering before range Doppler processing. The system identifies interfered chirps by filtering receiver signals and comparing power levels against thresholds, enabling early detection of interference patterns. This preliminary detection allows the radar system to flag and subsequently mitigate or avoid interference in affected time-frequency regions before it degrades overall system performance
Solution Approach 2:
The patent introduces an intermediary detection and classification mechanism between the receiver signal and the final target detection process. The high pass filter acts as an intermediary that separates interference components from valid target signals based on their spectral characteristics. By inserting this intermediary detection layer, the system can identify and isolate interference without directly affecting the primary signal processing chain
2Reliability
If interference detection is performed early in the signal processing chain, then interference mitigation effectiveness is improved, but processing complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the interference detection process into distinct functional segments: high pass filtering to extract interference components, power calculation to quantify interference levels, threshold comparison to classify interference severity, and flag generation to mark interfered chirps. This segmented approach allows each processing stage to focus on a specific aspect of interference detection, improving overall effectiveness while maintaining manageable complexity through modular processing
Solution Approach 2:
The patent utilizes parameter changes by monitoring power levels of filtered signals as a key parameter to detect interference. The system changes the state of signal processing by comparing power parameters against predetermined thresholds, enabling dynamic identification of interfered chirps. This parameter-based detection method provides a simple yet effective mechanism for early interference detection without requiring complex processing algorithms
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
Effectively detects and mitigates interference by distinguishing between target and interferer signals, improving radar system accuracy and reducing false targets, especially in scenarios with strong reflectors, thereby enhancing the reliability of FMCW radar systems.
Implementation Method 1
a high pass filter is applied to receiver signals in a receiver channel to remove discernible signals
Data Source
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AI summary
A data processing device and method for detecting interference in a FMCW radar system are described. For each of a plurality of transmitted chirps of the radar system, a high pass filter is applied to a receiver signal of a receiver channel of a radar receiver during an acquisition time corresponding to a transmitted chirp to remove those parts of the receiver signal corresponding to a reflected chirp having a power at the radar receiver greater than the noise power of the radar receiver of the radar system. The receiver signal power is calculated from the high pass filtered receiver signal. The receiver signal power is compared with a threshold noise power based on an estimate of the thermal noise of the radar receiver to determine whether the receiver signal corresponds to an interfered received chirp including interference or a non-interfered received chirp not including interference.