Radar Interference Mitigation via Time-Frequency Domain Analysis
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Solution Overview
Problem
Radar interference in marine navigation systems, particularly between different types of radar devices operating in the same frequency band, leads to degraded performance and difficulty in accurately tracking targets and obstacles.
Innovation Solution
A method involving the transformation of time-domain signals from radar devices into time-frequency domain signals, comparison with surrounding signals to identify interference, and subsequent repair by adjusting magnitudes or removing interference, followed by a reverse transformation to mitigate interference and improve signal clarity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple radar devices operate in the same frequency band, then radar coverage and navigation capability are improved, but interference between radar systems increases
Solution Approach 1:
The patent converts the harmful interference between radar systems into a beneficial detection mechanism. By analyzing interference patterns in the time-frequency domain, the system identifies and eliminates corrupted signals, transforming the presence of interference into an opportunity to improve signal quality and target detection accuracy.
Solution Approach 2:
The patent transitions from analyzing radar signals in the traditional time domain to the time-frequency domain, adding a dimensional perspective for signal analysis. This dimensional change enables the system to distinguish between legitimate radar returns and interference by examining frequency characteristics over time, thereby resolving interference issues while maintaining multi-radar operation.
2Measurement precision
If radar interference mitigation processing is applied, then signal clarity and target detection accuracy are improved, but processing complexity increases
Solution Approach 1:
The patent segments the radar signal processing into distinct stages: time-frequency transformation, interference detection through comparison with surrounding signals, and selective repair of corrupted segments. This segmentation allows the system to apply complex processing only where needed, maintaining target detection accuracy while managing overall processing complexity.
Solution Approach 2:
The patent introduces the time-frequency domain as an intermediary representation between the raw time-domain radar signals and the final processed output. This intermediary domain provides a framework for detecting and mitigating interference without requiring direct manipulation of the original signals, thereby improving target detection accuracy while keeping processing methods systematic and manageable.
Data Source
AI summary
Various implementations described herein are directed to a method for mitigating radar interference. The method may include receiving time domain signals from a radar device and transforming the time domain signals to time-frequency domain signals. The method may include comparing each time-frequency domain signal with one or more surrounding time-frequency domain signals to determine which of the time-frequency domain signals have interference. The method may include repairing the time-frequency domain signals having interference.