Radar Sensor Radome Deposition Detection Using Reference Structure
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Solution Overview
Problem
Radar sensors in motor vehicles are affected by depositions on the radome, leading to delayed or impaired object detection due to attenuation and angular distortion, with existing solutions requiring a long time to confirm depositions and causing critical transitions in radar system functionality.
Innovation Solution
A reference structure with radar-detectable markers, controlled by an adjusting apparatus, is moved into the radar sensor's detection area to quickly assess radar data deviations from a stored comparison dataset, allowing for immediate detection of depositions and triggering corrective measures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If algorithms are used to detect depositions on the radome, then the radar sensor can identify impaired perception, but the detection process requires a long period of time (30 seconds to several minutes) and compromises the false positive rate
Solution Approach 1:
The patent applies preliminary action by pre-defining reference values for radar measurement values under known clean radome conditions. Instead of performing complex algorithmic analysis over time to detect depositions, the system compares current measurements against these pre-established references, enabling immediate detection when deviations occur, thus eliminating the time delay while maintaining reliability
Solution Approach 2:
The patent introduces an intermediary reference structure with known radar reflection characteristics that serves as a mediator between the radar sensor and the deposition detection process. This reference structure provides stable, predictable radar returns that can be directly compared against measured values, acting as a benchmark that simplifies detection without requiring prolonged algorithmic analysis
2Reliability
If a long period of time is required before a clear statement about deposition can be made, then the false positive rate can be reduced, but the transition between impaired and detected states becomes critical and causes irregularities in radar functions
Solution Approach 1:
By pre-defining reference measurement values for clean radome conditions and establishing clear comparison criteria beforehand, the system eliminates the need for prolonged detection periods. The predetermined references serve as baseline standards that enable immediate, precise detection transitions without compromising false positive rates, as the comparison threshold is already optimized
Solution Approach 2:
The patent segments the detection process into distinct states: normal operation with clear reference comparison, and deposition detection when deviations exceed predetermined thresholds. This segmentation creates well-defined transition points between states, eliminating the critical gray zone that causes irregularities in radar functions
3Speed
If depositions on the radome are not detected quickly, then the radar sensor's object detection is delayed or impaired, but implementing complex detection algorithms increases system complexity and processing time
Solution Approach 1:
The reference structure acts as an intermediary that simplifies the detection task. Instead of implementing complex algorithms to analyze radar data for deposition signs, the system uses the reference structure's known, stable radar reflection characteristics as a direct comparison baseline, enabling fast detection through simple deviation detection rather than complex pattern recognition
Solution Approach 2:
The reference structure provides self-service by automatically providing stable, known radar reflection characteristics that serve as their own reference standard. The system leverages the inherent stability and predictability of the reference structure's radar properties without requiring external calibration or complex processing, enabling fast and simple deposition detection
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
Enables faster and more reliable detection of depositions on the radome, minimizing disruptions to radar sensor operations and improving the accuracy of radar data usage.
Implementation Method 1
radar sensors are mostly used as environment sensors for a medium and larger distance area in order to be able to determine the distance, angle and relative speed of other traffic participants or larger objects
Implementation Method 2
behind a component of the motor vehicle which is to be radiated through by the radar beams during measurement
Implementation Method 3
provide a plurality of defined radar reflectors, particularly at the back side of a motor vehicle, which at least partially reflect back a radar radiation incident thereon in the direction of a radiation source emitted by the radar radiation
Data Source
AI summary
A motor vehicle having at least one radar sensor, which is mounted behind a radome, formed by a component of the motor vehicle to be radiated through, and/or having a radome, wherein the motor vehicle further includes a reference structure having at least one radar-detectable marker, which can be controlled by an adjusting apparatus and moved into a measuring position in the detection area of a radar sensor outside the radome, and a control apparatus configured to control the adjusting apparatus, based on a trigger signal, for moving the reference structure into the measuring position and to evaluate radar data recorded by the radar sensor describing the reference structure in the measuring setting through a comparison with a comparison data set stored in the control apparatus and recorded without deposition on the radome for detection of the potential deposition. The trigger signal indicates a potential deposition, which restricts the performance of the radar sensor, on the radome.