Radar Sensor Reference Signal Check for Malfunction Detection
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Solution Overview
Problem
Existing radar sensor units in self-driving vehicles lack a reliable method to identify malfunctions, which is crucial for accurate traffic situation monitoring.
Innovation Solution
A system that includes a radar sensor unit, a processor unit, and a reference signal unit, where the reference signal unit modulates and reflects radar signals back to the sensor unit, allowing the processor to identify malfunctions by detecting the absence of the reference signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If radar sensor units are used for controlling self-driving vehicles, then traffic situation monitoring capability is improved, but reliability of sensor unit identification deteriorates
Solution Approach 1:
A reference signal unit is introduced as an intermediary element to enable reliable sensor unit identification. This reference signal unit emits known reference signals that are reflected by objects and received by the radar sensor unit, allowing the system to verify sensor functionality without adding complex external testing equipment.
Solution Approach 2:
The radar sensor unit performs self-diagnosis by comparing received reference signals against expected patterns. The sensor unit autonomously identifies its own malfunction status by processing the reference signals and determining whether they match predicted characteristics, eliminating the need for external monitoring systems.
2Reliability
If separate transmitting units are added for reference signals, then sensor unit malfunction detection is improved, but device complexity increases
Solution Approach 1:
The radar sensor unit's existing transmitting unit is made multi-functional by having it perform both traffic situation monitoring and self-diagnosis functions. The same transmitting unit that emits radar signals for object detection also emits reference signals for malfunction detection, eliminating the need for separate transmitting units.
Solution Approach 2:
The reference signal transmission function is merged with the existing radar signal transmission function. By combining these functions into a single transmitting unit, the system achieves reliable malfunction detection without increasing the number of transmitting components.
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 reliable identification of faulty radar sensor units, ensuring accurate traffic situation monitoring by eliminating the need for a separate transmitting unit and utilizing existing radar signals for reference signals.
Implementation Method 1
the radar sensor unit is designed to emit radar signals in the direction of the monitoring region, to receive radar signals reflected by objects within the monitoring region to the radar sensor unit
Implementation Method 2
the reference signal unit is designed to provide a radar signal emitted by the radar sensor unit with a modulation and to reflect a modulated radar signal back to the radar sensor unit as the reference signal
Data Source
AI summary
A system for monitoring a traffic situation includes at least one radar sensor unit for recording environmental data in a monitoring region of the radar sensor unit. A central processor evaluates the environmental data from the radar sensor unit and determines the traffic situation within the monitoring region based on the environmental data. A reference signal unit for outputting a reference signal to the radar sensor unit is configured to modulate a radar signal emitted by the radar sensor unit and to reflect a modulated radar signal back to the radar sensor unit as a reference signal. The processor identifies the modulated radar signal as a reference signal from the reference signal unit and recognizes a malfunction of the radar sensor unit if a reference signal is not received by the radar sensor unit.