Radar Ghost Target Discrimination Using Abreast Motion Analysis
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Solution Overview
Problem
Radar systems often erroneously detect ghost targets due to refracted electromagnetic waves, leading to incorrect target identification and potential unnecessary deceleration, especially when multiple vehicles are present at the same distance and speed, causing real targets to be misclassified as ghost targets.
Innovation Solution
An object detecting apparatus that includes ghost target candidate judging, running-abreast target judging, and ghost target judging means to differentiate between actual and ghost targets by analyzing the receiving levels and positional changes of targets relative to the subject vehicle, preventing misclassification by determining the target with the lower receiving level as a ghost target when running abreast of another target.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the radar system deletes ghost data based on equal distance and lower receiving level, then ghost targets are removed, but real targets running abreast are erroneously deleted
Solution Approach 1:
The patent introduces a new dimension for discrimination by analyzing the temporal变化 in receiving levels and positional information. Instead of relying solely on static receiving level differences, the system monitors how these parameters change over time as targets move relative to the radar, enabling distinction between ghost targets and real targets running abreast.
Solution Approach 2:
The system continuously monitors and compares receiving levels and positional data over multiple measurement cycles, using feedback from temporal changes to refine target identification. This dynamic feedback mechanism allows the system to adjust its ghost target deletion criteria based on observed motion patterns and receiving level variations.
2Adaptability or versatility
If the radar system outputs side lobe beams at predetermined angles from the main beam, then coverage is expanded, but ghost targets are detected due to reflected waves from roadside objects
Solution Approach 1:
The patent extracts and separately processes the information from side lobe beams, treating detections from these beams as potential ghost targets that require special handling. By isolating side lobe detections and applying specific validation criteria, the system maintains the expanded coverage benefit while filtering out spurious ghost target detections.
3Measurement precision
If the radar system uses ice crystals on radome to refract and output ghost beams, then detection sensitivity is improved, but erroneous ghost targets are detected
Solution Approach 1:
The patent converts the harmful effect of ice crystal refraction into a beneficial discrimination tool. By monitoring the temporal patterns and positional characteristics of detections, the system learns to distinguish between genuine targets and ghost targets created by ice crystal refraction, ultimately improving reliability while maintaining sensitivity.
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 solution enhances the precision of target identification by accurately distinguishing between ghost and real targets, reducing the likelihood of erroneous deceleration and improving the reliability of radar systems in complex traffic scenarios.
Implementation Method 1
detect a target by transmitting an electromagnetic wave, and by receiving a reflected wave resulting from reflection of the electromagnetic wave by the target
Implementation Method 2
When a radar beam transmitted from a radar system is refracted due to a prism effect of ice crystals adhering to a radome of the radar system, and a ghost beam is accordingly outputted in a direction different from a direction of a main beam
Data Source
AI summary
A ghost target candidate judging device judges that one target of two targets is a candidate for a ghost target where the distances of the two targets from a subject vehicle are equal to each other and where the difference between receiving levels of the two targets is not less than a predetermined value. A running-abreast target judging device judges that one target is the target running abreast of the other target based on changes in an angle difference and in a left-right positional difference between the two targets in accordance with the change in the distances of the two targets from the subject vehicle. The ghost target judging device judges, as the ghost target, a target obtained by removing the running-abreast target data from the candidates for the ghost target. The running-abreast target is prevented from being erroneously recognized as the ghost target while judging which target is the ghost target. Also, a target indicating a lower receiving level is prevented from erroneously being judged as a ghost target when two targets indicating their respective different receiving levels are running side by side.