Radar Sensor Antenna Signal Error Detection
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Solution Overview
Problem
Existing radar sensors struggle to accurately detect the direction of targets due to erroneous antenna signals caused by factors like aging, temperature effects, and concealed installations, which lead to phase and amplitude errors and degrade the correlation value.
Innovation Solution
A method is introduced to detect and compensate for erroneous antenna signals by forming subsets of antenna signals, estimating the direction using these subsets, and comparing the correlation values to predefined criteria to identify and exclude erroneous signals, thereby improving the accuracy of direction estimation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If antenna signals are used for direction estimation, then direction information can be obtained, but erroneous signals from diaphragms or environmental effects cause phase and amplitude errors that degrade measurement accuracy
Solution Approach 1:
The patent extracts and removes erroneous antenna signals from the complete set by comparing correlation values. The control device identifies signals with correlation values below a threshold and excludes them from direction estimation, thereby separating useful signals from harmful erroneous signals caused by diaphragms or environmental effects.
Solution Approach 2:
The patent implements feedback by using correlation values to monitor signal quality and adjust the set of antenna signals used for direction estimation. The control device continuously evaluates correlation values and dynamically excludes erroneous signals, creating a closed-loop system that maintains measurement precision despite varying signal conditions.
2Productivity
If all antenna signals are used for direction estimation, then more data is available for calculation, but erroneous signals degrade the correlation value and reduce estimation accuracy
Solution Approach 1:
The patent applies partial action by using only the subset of antenna signals that meet quality criteria (correlation value threshold) for direction estimation. Instead of using all available signals, the system selectively employs only those signals that contribute positively to measurement accuracy, excluding erroneous signals that would degrade the correlation value.
3Ease of manufacture
If the radar sensor is installed behind a diaphragm, then integration with vehicle structure is improved, but the diaphragm interferes with radar signal reception and causes phase shifts
Solution Approach 1:
The patent converts the harmful effect of diaphragm-induced phase shifts into a detectable characteristic. By measuring correlation values and identifying signals with abnormal phase relationships, the system detects erroneous signals caused by diaphragm interference and excludes them from direction estimation, thereby maintaining accuracy despite the compromised installation environment.
Data Source
AI summary
A method for detecting erroneous antenna signals from a radar sensor having a plurality of antennas. A subset of the antenna signals is formed by omitting at least one antenna signal from a complete set of the antenna signals. A direction to an object is estimated using the subset and an antenna pattern of the radar sensor and, in so doing, a correlation value of the subset of the antenna signals with the antenna pattern in the estimated direction is determined. The at least one omitted antenna signal for the subset is classified as erroneous if the correlation value satisfies a selection condition.