Vehicle Radar Transceiver Self-Test After Bumper Repainting
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for evaluating the impact of paint on radar transceiver performance, such as after re-painting a vehicle bumper, are inadequate as they require driving the vehicle or expensive equipment, and do not account for variations in paint characteristics affecting detection range and azimuth angle accuracy.
Innovation Solution
A radar system with a control unit that adjusts signal power levels and receives reflected signals to determine if and how much radar transceiver characteristics have changed, using predefined or undefined targets to assess performance without special equipment or vehicle movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If driving the vehicle is used to detect radar performance changes, then detection accuracy is improved, but ease of operation deteriorates
Solution Approach 1:
The radar transceiver tests itself by transmitting signals and processing the returned signals from surrounding objects. The control unit controls the radar transceiver to transmit radar signals and process the returned signals, enabling self-diagnosis without requiring external test equipment or vehicle movement.
Solution Approach 2:
Environmental objects (buildings, trees, other vehicles) serve as intermediate targets for signal reflection. Instead of requiring a controlled test environment or special targets, the system uses naturally occurring objects in the vehicle's surroundings as mediators to reflect radar signals back to the transceiver for performance evaluation.
2Measurement precision
If expensive receiver equipment is used to measure radiated waves, then measurement precision is improved, but device complexity deteriorates
Solution Approach 1:
The radar transceiver uses its own built-in receiver to measure the strength of returned signals. Instead of requiring external expensive RF measurement equipment, the system leverages the existing receiver components within the radar transceiver itself to perform the measurement function.
Solution Approach 2:
The radar transceiver's receiver serves multiple functions: it receives operational radar signals for normal vehicle detection and simultaneously receives test signals for performance evaluation. This multi-functionality eliminates the need for separate dedicated measurement equipment.
3Ease of operation
If paint thickness measurement using ultrasonic probe is used, then ease of operation is improved, but measurement precision deteriorates
Solution Approach 1:
The patent replaces mechanical ultrasonic thickness measurement with electromagnetic radar signal measurement. Instead of using contact-based ultrasonic probes to measure paint thickness, the system uses radar signals to directly measure the impact on radar wave propagation, providing more relevant data for radar performance assessment.
Solution Approach 2:
The radar signal itself acts as the intermediary to assess paint impact. Rather than measuring paint thickness as an intermediate step, the system directly measures how the paint layer affects radar signal transmission and reflection, providing a more direct correlation to actual radar performance.
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 effective evaluation of radar transceiver performance post-painting without vehicle movement, using low-cost setups and predefined or environmental targets to ensure accurate detection range and azimuth angle estimation.
Implementation Method 1
A radar transceiver is, normally, a device arranged for transmission and reception of radar signals in a dedicated radar frequency band
Implementation Method 2
receive reflected radar signals that have been reflected by at least one object
Data Source
AI summary
A radar system (2) for a vehicle (1), having a radar transceiver (3) and a control unit (4), where the control unit (4) is adapted to control the radar transceiver to apply an initial signal power level (Pi) for transmitted radar signals (5); and to receive reflected radar signals (6) that have been reflected by at least one object (7). The control unit (4) is further adapted to determine a total signal reduction level (L) for which at least one predetermined criterion is not met; to compare the total signal reduction level (L) to a threshold; and to determine whether the radar transceiver (3) is working in an acceptable manner or not in dependence of the comparison.