Vehicular Radar Blockage Detection via Phase Delay Analysis
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Solution Overview
Problem
Existing vehicle sensing systems using radar sensors struggle to accurately detect performance degradation caused by blockages such as dirt, snow, or debris, which affects the range detection capabilities of the radar sensor.
Innovation Solution
The vehicular radar sensing system employs a MIMO antenna array to analyze phase progression linearity and determine common phase delays associated with blockages. It estimates performance degradation by comparing power confidence and historical signal data before and after blockage events, and adjusts driving assistance systems accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If radar sensors are used for object detection, then detection capability is improved, but performance degradation due to blockages cannot be accurately detected
Solution Approach 1:
The patent uses road surface reflections as an intermediary indicator to detect radar sensor blockages. Instead of directly measuring blockage, the system monitors changes in reflected signal characteristics from the road surface, which serve as a mediator to infer the presence and severity of blockages on the radar sensor.
Solution Approach 2:
The system implements feedback by continuously monitoring radar signal characteristics and comparing them against expected patterns. When deviations indicating blockage are detected, the system adjusts driving assistance functions accordingly, creating a closed-loop system that adapts to sensor degradation in real-time.
2Productivity
If driving assistance systems operate with blocked radar sensors, then vehicle operation continues, but detection performance deteriorates
Solution Approach 1:
The system prepares for potential performance degradation by implementing compensatory measures before complete failure occurs. When blockage is detected, the system proactively adjusts driving assistance functions to account for reduced detection capability, cushioning the impact of performance degradation on overall system reliability.
Solution Approach 2:
The patent dynamically adjusts the operation of driving assistance systems based on real-time radar performance assessment. Instead of static operation modes, the system continuously adapts its detection and control strategies according to the current blockage level, optimizing performance continuity despite varying sensor conditions.
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
The system effectively detects radar sensor blockages and estimates performance degradation, enabling adjustments to driving assistance systems to ensure safe vehicle operation even under degraded sensing conditions.
Implementation Method 1
The radar sensor transmits radio signals and receives radio signals. The radar sensor is operable to capture radar data based on the received radio signals.
Implementation Method 2
Phase delays of the plurality of phase delays are associated with respective received radio signals reflected off respective detected objects of the plurality of detected objects.
Implementation Method 3
The vehicular radar sensing system determines a plurality of phase delays in the radar data, and each phase delay of the plurality of phase delays represents a delay in receiving radio signals at the radar sensor.
Data Source
AI summary
A vehicular radar sensing system includes a radar sensor disposed at a vehicle. The radar sensor transmits and receives radio signals. The vehicular radar sensing system, via processing of radar data captured by the radar sensor, detects a plurality of objects present within a field of sensing of the radar sensor. The system determines a plurality of phase delays in the radar data. Phase delays of the plurality of phase delays are associated with respective received radio signals reflected off respective detected objects of the plurality of detected objects. The vehicular radar sensing system determines a common phase delay of the plurality of phase delays that is common among the received radio signals reflected off detected objects. The system, responsive to determining that an amount of performance degradation of the radar sensor based on the blockage is greater than a threshold amount, adjusts a driving assistance system of the vehicle.