Radar Sensor Interference Detection via Chirp Signal Comparison
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Solution Overview
Problem
Radar sensors face challenges in detecting and suppressing interference in received signals, especially when the entire chirp signal is affected, which can falsify target object detection due to wide azimuth detection ranges and superimposed interference from various spatial directions.
Innovation Solution
A method using an electronic computing device to compare samples of consecutive frequency-modulated chirp signals to detect interference by determining deviations, generating an interference matrix to identify affected samples, and applying signal correction algorithms to suppress interference effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the radar sensor covers a wide azimuth detection range (e.g., 150°), then the field of view and detection range are improved, but the sensor is exposed to more interference signals from different spatial directions that can falsify target object detection
Solution Approach 1:
The patent segments the received signal into multiple individual chirp signals and further divides each chirp signal into multiple samples. By processing these segmented components separately and comparing them, the system can identify and suppress interference affecting specific segments while preserving useful signals in other segments, thus maintaining wide detection range while reducing interference impact.
Solution Approach 2:
The patent converts the harmful interference signals into a detectable pattern by comparing samples across different chirp signals. When interference is present, it creates consistent deviations that can be identified through statistical analysis. The system uses these deviations to flag and suppress interfered samples, transforming the harmful interference into a detectable signature that triggers correction actions.
2Device complexity
If conventional interference detection methods are used on single chirp signals, then the detection process is simpler, but they fail to detect interference when the entire chirp signal is affected
Solution Approach 1:
The patent merges multiple chirp signals and their samples into a unified analysis framework. By comparing corresponding samples across multiple chirp signals, the system can detect interference patterns that affect entire chirp signals, which would be invisible to single-chirp analysis methods. This merging approach maintains manageable complexity while significantly improving detection reliability.
Solution Approach 2:
The patent implements a feedback mechanism where the comparison results from multiple chirp signals feed into an interference detection decision, which then triggers sample suppression or correction actions. The system continuously monitors for interference patterns and dynamically adjusts processing based on detected conditions, creating a closed-loop system that improves reliability without requiring overly complex open-loop detection mechanisms.
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 allows for reliable detection and suppression of interference in radar sensor signals, enhancing the accuracy and precision of target object detection by distinguishing between useful and interfering signals within the received chirp signals.
Implementation Method 1
the radar sensor emits a transmit signal (electromagnetic waves), which is then reflected on the target object to be detected and received by the radar sensor as radar echo
Implementation Method 2
the emitted signal includes a sequence (burst) of frequency-modulated chirp signals
Data Source
AI summary
A method for detecting interference in a received signal received by a radar sensor of a motor vehicle is disclosed. For detecting a target object in an environment of the motor vehicle, a transmit signal is emitted by the radar sensor, which includes a sequence of consecutive frequency-modulated chirp signals. The radar sensor then receives an echo signal reflected on the target object as the received signal with the superimposed interference. After receiving the received signal, the interference in the chirp signals of the received signal is detected.